1 | /* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ |
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2 | /* |
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3 | * Copyright (c) 2004, Apple Computer, Inc. and The Mozilla Foundation. |
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4 | * All rights reserved. |
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5 | * |
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6 | * Redistribution and use in source and binary forms, with or without |
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7 | * modification, are permitted provided that the following conditions are |
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8 | * met: |
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9 | * |
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10 | * 1. Redistributions of source code must retain the above copyright |
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11 | * notice, this list of conditions and the following disclaimer. |
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12 | * 2. Redistributions in binary form must reproduce the above copyright |
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13 | * notice, this list of conditions and the following disclaimer in the |
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14 | * documentation and/or other materials provided with the distribution. |
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15 | * 3. Neither the names of Apple Computer, Inc. ("Apple") or The Mozilla |
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16 | * Foundation ("Mozilla") nor the names of their contributors may be used |
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17 | * to endorse or promote products derived from this software without |
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18 | * specific prior written permission. |
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19 | * |
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20 | * THIS SOFTWARE IS PROVIDED BY APPLE, MOZILLA AND THEIR CONTRIBUTORS "AS |
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21 | * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
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22 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A |
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23 | * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE, MOZILLA OR |
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24 | * THEIR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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25 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED |
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26 | * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
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27 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
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28 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
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29 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
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30 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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31 | * |
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32 | */ |
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33 | #ifndef _NP_RUNTIME_H_ |
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34 | #define _NP_RUNTIME_H_ |
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35 | |
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36 | #ifdef __cplusplus |
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37 | extern "C" { |
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38 | #endif |
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39 | |
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40 | #include "nptypes.h" |
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41 | |
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42 | /* |
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43 | This API is used to facilitate binding code written in C to script |
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44 | objects. The API in this header does not assume the presence of a |
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45 | user agent. That is, it can be used to bind C code to scripting |
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46 | environments outside of the context of a user agent. |
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47 | |
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48 | However, the normal use of the this API is in the context of a |
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49 | scripting environment running in a browser or other user agent. |
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50 | In particular it is used to support the extended Netscape |
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51 | script-ability API for plugins (NP-SAP). NP-SAP is an extension |
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52 | of the Netscape plugin API. As such we have adopted the use of |
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53 | the "NP" prefix for this API. |
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54 | |
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55 | The following NP{N|P}Variables were added to the Netscape plugin |
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56 | API (in npapi.h): |
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57 | |
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58 | NPNVWindowNPObject |
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59 | NPNVPluginElementNPObject |
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60 | NPPVpluginScriptableNPObject |
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61 | |
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62 | These variables are exposed through NPN_GetValue() and |
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63 | NPP_GetValue() (respectively) and are used to establish the |
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64 | initial binding between the user agent and native code. The DOM |
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65 | objects in the user agent can be examined and manipulated using |
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66 | the NPN_ functions that operate on NPObjects described in this |
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67 | header. |
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68 | |
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69 | To the extent possible the assumptions about the scripting |
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70 | language used by the scripting environment have been minimized. |
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71 | */ |
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72 | |
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73 | #define NP_BEGIN_MACRO do { |
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74 | #define NP_END_MACRO } while (0) |
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75 | |
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76 | /* |
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77 | Objects (non-primitive data) passed between 'C' and script is |
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78 | always wrapped in an NPObject. The 'interface' of an NPObject is |
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79 | described by an NPClass. |
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80 | */ |
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81 | typedef struct NPObject NPObject; |
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82 | typedef struct NPClass NPClass; |
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83 | |
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84 | typedef char NPUTF8; |
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85 | typedef struct _NPString { |
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86 | const NPUTF8 *UTF8Characters; |
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87 | uint32_t UTF8Length; |
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88 | } NPString; |
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89 | |
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90 | typedef enum { |
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91 | NPVariantType_Void, |
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92 | NPVariantType_Null, |
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93 | NPVariantType_Bool, |
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94 | NPVariantType_Int32, |
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95 | NPVariantType_Double, |
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96 | NPVariantType_String, |
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97 | NPVariantType_Object |
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98 | } NPVariantType; |
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99 | |
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100 | typedef struct _NPVariant { |
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101 | NPVariantType type; |
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102 | union { |
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103 | bool boolValue; |
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104 | int32_t intValue; |
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105 | double doubleValue; |
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106 | NPString stringValue; |
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107 | NPObject *objectValue; |
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108 | } value; |
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109 | } NPVariant; |
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110 | |
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111 | /* |
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112 | NPN_ReleaseVariantValue is called on all 'out' parameters |
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113 | references. Specifically it is to be called on variants that own |
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114 | their value, as is the case with all non-const NPVariant* |
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115 | arguments after a successful call to any methods (except this one) |
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116 | in this API. |
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117 | |
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118 | After calling NPN_ReleaseVariantValue, the type of the variant |
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119 | will be NPVariantType_Void. |
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120 | */ |
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121 | void NPN_ReleaseVariantValue(NPVariant *variant); |
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122 | |
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123 | #define NPVARIANT_IS_VOID(_v) ((_v).type == NPVariantType_Void) |
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124 | #define NPVARIANT_IS_NULL(_v) ((_v).type == NPVariantType_Null) |
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125 | #define NPVARIANT_IS_BOOLEAN(_v) ((_v).type == NPVariantType_Bool) |
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126 | #define NPVARIANT_IS_INT32(_v) ((_v).type == NPVariantType_Int32) |
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127 | #define NPVARIANT_IS_DOUBLE(_v) ((_v).type == NPVariantType_Double) |
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128 | #define NPVARIANT_IS_STRING(_v) ((_v).type == NPVariantType_String) |
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129 | #define NPVARIANT_IS_OBJECT(_v) ((_v).type == NPVariantType_Object) |
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130 | |
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131 | #define NPVARIANT_TO_BOOLEAN(_v) ((_v).value.boolValue) |
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132 | #define NPVARIANT_TO_INT32(_v) ((_v).value.intValue) |
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133 | #define NPVARIANT_TO_DOUBLE(_v) ((_v).value.doubleValue) |
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134 | #define NPVARIANT_TO_STRING(_v) ((_v).value.stringValue) |
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135 | #define NPVARIANT_TO_OBJECT(_v) ((_v).value.objectValue) |
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136 | |
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137 | #define VOID_TO_NPVARIANT(_v) \ |
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138 | NP_BEGIN_MACRO \ |
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139 | (_v).type = NPVariantType_Void; \ |
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140 | (_v).value.objectValue = NULL; \ |
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141 | NP_END_MACRO |
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142 | |
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143 | #define NULL_TO_NPVARIANT(_v) \ |
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144 | NP_BEGIN_MACRO \ |
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145 | (_v).type = NPVariantType_Null; \ |
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146 | (_v).value.objectValue = NULL; \ |
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147 | NP_END_MACRO |
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148 | |
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149 | #define BOOLEAN_TO_NPVARIANT(_val, _v) \ |
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150 | NP_BEGIN_MACRO \ |
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151 | (_v).type = NPVariantType_Bool; \ |
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152 | (_v).value.boolValue = !!(_val); \ |
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153 | NP_END_MACRO |
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154 | |
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155 | #define INT32_TO_NPVARIANT(_val, _v) \ |
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156 | NP_BEGIN_MACRO \ |
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157 | (_v).type = NPVariantType_Int32; \ |
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158 | (_v).value.intValue = _val; \ |
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159 | NP_END_MACRO |
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160 | |
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161 | #define DOUBLE_TO_NPVARIANT(_val, _v) \ |
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162 | NP_BEGIN_MACRO \ |
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163 | (_v).type = NPVariantType_Double; \ |
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164 | (_v).value.doubleValue = _val; \ |
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165 | NP_END_MACRO |
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166 | |
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167 | #define STRINGZ_TO_NPVARIANT(_val, _v) \ |
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168 | NP_BEGIN_MACRO \ |
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169 | (_v).type = NPVariantType_String; \ |
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170 | NPString str = { _val, (uint32_t)(strlen(_val)) }; \ |
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171 | (_v).value.stringValue = str; \ |
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172 | NP_END_MACRO |
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173 | |
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174 | #define STRINGN_TO_NPVARIANT(_val, _len, _v) \ |
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175 | NP_BEGIN_MACRO \ |
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176 | (_v).type = NPVariantType_String; \ |
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177 | NPString str = { _val, (uint32_t)(_len) }; \ |
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178 | (_v).value.stringValue = str; \ |
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179 | NP_END_MACRO |
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180 | |
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181 | #define OBJECT_TO_NPVARIANT(_val, _v) \ |
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182 | NP_BEGIN_MACRO \ |
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183 | (_v).type = NPVariantType_Object; \ |
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184 | (_v).value.objectValue = _val; \ |
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185 | NP_END_MACRO |
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186 | |
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187 | |
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188 | /* |
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189 | Type mappings (JavaScript types have been used for illustration |
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190 | purposes): |
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191 | |
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192 | JavaScript to C (NPVariant with type:) |
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193 | undefined NPVariantType_Void |
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194 | null NPVariantType_Null |
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195 | Boolean NPVariantType_Bool |
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196 | Number NPVariantType_Double or NPVariantType_Int32 |
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197 | String NPVariantType_String |
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198 | Object NPVariantType_Object |
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199 | |
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200 | C (NPVariant with type:) to JavaScript |
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201 | NPVariantType_Void undefined |
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202 | NPVariantType_Null null |
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203 | NPVariantType_Bool Boolean |
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204 | NPVariantType_Int32 Number |
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205 | NPVariantType_Double Number |
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206 | NPVariantType_String String |
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207 | NPVariantType_Object Object |
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208 | */ |
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209 | |
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210 | typedef void *NPIdentifier; |
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211 | |
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212 | /* |
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213 | NPObjects have methods and properties. Methods and properties are |
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214 | identified with NPIdentifiers. These identifiers may be reflected |
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215 | in script. NPIdentifiers can be either strings or integers, IOW, |
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216 | methods and properties can be identified by either strings or |
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217 | integers (i.e. foo["bar"] vs foo[1]). NPIdentifiers can be |
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218 | compared using ==. In case of any errors, the requested |
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219 | NPIdentifier(s) will be NULL. NPIdentifier lifetime is controlled |
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220 | by the browser. Plugins do not need to worry about memory management |
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221 | with regards to NPIdentifiers. |
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222 | */ |
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223 | NPIdentifier NPN_GetStringIdentifier(const NPUTF8 *name); |
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224 | void NPN_GetStringIdentifiers(const NPUTF8 **names, int32_t nameCount, |
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225 | NPIdentifier *identifiers); |
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226 | NPIdentifier NPN_GetIntIdentifier(int32_t intid); |
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227 | bool NPN_IdentifierIsString(NPIdentifier identifier); |
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228 | |
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229 | /* |
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230 | The NPUTF8 returned from NPN_UTF8FromIdentifier SHOULD be freed. |
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231 | */ |
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232 | NPUTF8 *NPN_UTF8FromIdentifier(NPIdentifier identifier); |
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233 | |
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234 | /* |
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235 | Get the integer represented by identifier. If identifier is not an |
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236 | integer identifier, the behaviour is undefined. |
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237 | */ |
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238 | int32_t NPN_IntFromIdentifier(NPIdentifier identifier); |
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239 | |
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240 | /* |
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241 | NPObject behavior is implemented using the following set of |
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242 | callback functions. |
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243 | |
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244 | The NPVariant *result argument of these functions (where |
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245 | applicable) should be released using NPN_ReleaseVariantValue(). |
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246 | */ |
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247 | typedef NPObject *(*NPAllocateFunctionPtr)(NPP npp, NPClass *aClass); |
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248 | typedef void (*NPDeallocateFunctionPtr)(NPObject *npobj); |
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249 | typedef void (*NPInvalidateFunctionPtr)(NPObject *npobj); |
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250 | typedef bool (*NPHasMethodFunctionPtr)(NPObject *npobj, NPIdentifier name); |
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251 | typedef bool (*NPInvokeFunctionPtr)(NPObject *npobj, NPIdentifier name, |
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252 | const NPVariant *args, uint32_t argCount, |
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253 | NPVariant *result); |
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254 | typedef bool (*NPInvokeDefaultFunctionPtr)(NPObject *npobj, |
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255 | const NPVariant *args, |
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256 | uint32_t argCount, |
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257 | NPVariant *result); |
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258 | typedef bool (*NPHasPropertyFunctionPtr)(NPObject *npobj, NPIdentifier name); |
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259 | typedef bool (*NPGetPropertyFunctionPtr)(NPObject *npobj, NPIdentifier name, |
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260 | NPVariant *result); |
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261 | typedef bool (*NPSetPropertyFunctionPtr)(NPObject *npobj, NPIdentifier name, |
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262 | const NPVariant *value); |
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263 | typedef bool (*NPRemovePropertyFunctionPtr)(NPObject *npobj, |
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264 | NPIdentifier name); |
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265 | typedef bool (*NPEnumerationFunctionPtr)(NPObject *npobj, NPIdentifier **value, |
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266 | uint32_t *count); |
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267 | typedef bool (*NPConstructFunctionPtr)(NPObject *npobj, |
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268 | const NPVariant *args, |
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269 | uint32_t argCount, |
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270 | NPVariant *result); |
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271 | |
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272 | /* |
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273 | NPObjects returned by create, retain, invoke, and getProperty pass |
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274 | a reference count to the caller. That is, the callee adds a |
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275 | reference count which passes to the caller. It is the caller's |
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276 | responsibility to release the returned object. |
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277 | |
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278 | NPInvokeFunctionPtr function may return 0 to indicate a void |
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279 | result. |
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280 | |
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281 | NPInvalidateFunctionPtr is called by the scripting environment |
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282 | when the native code is shutdown. Any attempt to message a |
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283 | NPObject instance after the invalidate callback has been |
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284 | called will result in undefined behavior, even if the native code |
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285 | is still retaining those NPObject instances. (The runtime |
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286 | will typically return immediately, with 0 or NULL, from an attempt |
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287 | to dispatch to a NPObject, but this behavior should not be |
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288 | depended upon.) |
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289 | |
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290 | The NPEnumerationFunctionPtr function may pass an array of |
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291 | NPIdentifiers back to the caller. The callee allocs the memory of |
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292 | the array using NPN_MemAlloc(), and it's the caller's responsibility |
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293 | to release it using NPN_MemFree(). |
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294 | */ |
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295 | struct NPClass |
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296 | { |
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297 | uint32_t structVersion; |
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298 | NPAllocateFunctionPtr allocate; |
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299 | NPDeallocateFunctionPtr deallocate; |
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300 | NPInvalidateFunctionPtr invalidate; |
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301 | NPHasMethodFunctionPtr hasMethod; |
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302 | NPInvokeFunctionPtr invoke; |
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303 | NPInvokeDefaultFunctionPtr invokeDefault; |
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304 | NPHasPropertyFunctionPtr hasProperty; |
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305 | NPGetPropertyFunctionPtr getProperty; |
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306 | NPSetPropertyFunctionPtr setProperty; |
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307 | NPRemovePropertyFunctionPtr removeProperty; |
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308 | NPEnumerationFunctionPtr enumerate; |
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309 | NPConstructFunctionPtr construct; |
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310 | }; |
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311 | |
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312 | #define NP_CLASS_STRUCT_VERSION 3 |
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313 | |
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314 | #define NP_CLASS_STRUCT_VERSION_ENUM 2 |
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315 | #define NP_CLASS_STRUCT_VERSION_CTOR 3 |
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316 | |
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317 | #define NP_CLASS_STRUCT_VERSION_HAS_ENUM(npclass) \ |
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318 | ((npclass)->structVersion >= NP_CLASS_STRUCT_VERSION_ENUM) |
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319 | |
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320 | #define NP_CLASS_STRUCT_VERSION_HAS_CTOR(npclass) \ |
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321 | ((npclass)->structVersion >= NP_CLASS_STRUCT_VERSION_CTOR) |
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322 | |
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323 | struct NPObject { |
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324 | NPClass *_class; |
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325 | uint32_t referenceCount; |
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326 | /* |
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327 | * Additional space may be allocated here by types of NPObjects |
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328 | */ |
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329 | }; |
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330 | |
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331 | /* |
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332 | If the class has an allocate function, NPN_CreateObject invokes |
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333 | that function, otherwise a NPObject is allocated and |
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334 | returned. This method will initialize the referenceCount member of |
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335 | the NPObject to 1. |
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336 | */ |
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337 | NPObject *NPN_CreateObject(NPP npp, NPClass *aClass); |
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338 | |
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339 | /* |
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340 | Increment the NPObject's reference count. |
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341 | */ |
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342 | NPObject *NPN_RetainObject(NPObject *npobj); |
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343 | |
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344 | /* |
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345 | Decremented the NPObject's reference count. If the reference |
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346 | count goes to zero, the class's destroy function is invoke if |
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347 | specified, otherwise the object is freed directly. |
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348 | */ |
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349 | void NPN_ReleaseObject(NPObject *npobj); |
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350 | |
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351 | /* |
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352 | Functions to access script objects represented by NPObject. |
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353 | |
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354 | Calls to script objects are synchronous. If a function returns a |
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355 | value, it will be supplied via the result NPVariant |
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356 | argument. Successful calls will return true, false will be |
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357 | returned in case of an error. |
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358 | |
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359 | Calls made from plugin code to script must be made from the thread |
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360 | on which the plugin was initialized. |
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361 | */ |
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362 | |
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363 | bool NPN_Invoke(NPP npp, NPObject *npobj, NPIdentifier methodName, |
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364 | const NPVariant *args, uint32_t argCount, NPVariant *result); |
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365 | bool NPN_InvokeDefault(NPP npp, NPObject *npobj, const NPVariant *args, |
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366 | uint32_t argCount, NPVariant *result); |
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367 | bool NPN_Evaluate(NPP npp, NPObject *npobj, NPString *script, |
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368 | NPVariant *result); |
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369 | bool NPN_GetProperty(NPP npp, NPObject *npobj, NPIdentifier propertyName, |
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370 | NPVariant *result); |
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371 | bool NPN_SetProperty(NPP npp, NPObject *npobj, NPIdentifier propertyName, |
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372 | const NPVariant *value); |
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373 | bool NPN_RemoveProperty(NPP npp, NPObject *npobj, NPIdentifier propertyName); |
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374 | bool NPN_HasProperty(NPP npp, NPObject *npobj, NPIdentifier propertyName); |
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375 | bool NPN_HasMethod(NPP npp, NPObject *npobj, NPIdentifier methodName); |
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376 | bool NPN_Enumerate(NPP npp, NPObject *npobj, NPIdentifier **identifier, |
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377 | uint32_t *count); |
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378 | bool NPN_Construct(NPP npp, NPObject *npobj, const NPVariant *args, |
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379 | uint32_t argCount, NPVariant *result); |
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380 | |
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381 | /* |
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382 | NPN_SetException may be called to trigger a script exception upon |
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383 | return from entry points into NPObjects. Typical usage: |
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384 | |
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385 | NPN_SetException (npobj, message); |
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386 | */ |
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387 | void NPN_SetException(NPObject *npobj, const NPUTF8 *message); |
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388 | |
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389 | #ifdef __cplusplus |
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390 | } |
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391 | #endif |
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392 | |
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393 | #endif |
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