Firefox NPAPI Xcode链接错误

Question

我正在尝试构建适用于Mac OSX的Firefox插件，它构建得很好，但我不明白链接器失败的原因。

这里是连接器的日志：

Undefined symbols: 
    "_NPN_ReleaseVariantValue", referenced from: 
     _NPP_New in npp_gate.o 
     _NPP_New in npp_gate.o 
    "_NPN_MemAlloc", referenced from: 
     String2Variant(_NPVariant*, char const*)in plugin.o 
    "_NPN_GetValue", referenced from: 
     _NPP_New in npp_gate.o 
    "_NPN_ReleaseObject", referenced from: 
     CPlugin::~CPlugin()in plugin.o 
     CPlugin::~CPlugin()in plugin.o 
    "_NPN_Version", referenced from: 
     CPlugin::CPlugin(_NPP*)in plugin.o 
     CPlugin::CPlugin(_NPP*)in plugin.o 
    "_NPN_UserAgent", referenced from: 
     CPlugin::CPlugin(_NPP*)in plugin.o 
     CPlugin::CPlugin(_NPP*)in plugin.o 
    "_NPN_GetProperty", referenced from: 
     _NPP_New in npp_gate.o 
     _NPP_New in npp_gate.o 
    "_NPN_GetURL", referenced from: 
     _NPP_New in npp_gate.o 
     CPluginData::Fire_OnZoomChange()  in CTPlugin.o 
     CPluginData::Fire_OnPIPMove()  in CTPlugin.o 
     CPluginData::Fire_OnItem(int, bool)in CTPlugin.o 
     CPluginData::Fire_OnClose(char const*)in CTPlugin.o 
     CPluginData::Fire_OnWheel(int) in CTPlugin.o 
     CPluginData::Fire_OnRightClick(int, int)in CTPlugin.o 
     CPluginData::Fire_OnKeyPress(unsigned short)in CTPlugin.o 
     CPluginData::Fire_OnMouseDn(int, int)in CTPlugin.o 
     CPluginData::Fire_OnMouseUp(int, int)in CTPlugin.o 
     CPluginData::Fire_OnMouseMove(int, int)in CTPlugin.o 
     CPluginData::Fire_OnClick(int, int)in CTPlugin.o 
     CPluginData::Fire_OnSelect()  in CTPlugin.o 
     CPluginData::Fire_OnStatus(char const*)in CTPlugin.o 
     CPluginData::Fire_OnImage(int, int, int, int)in CTPlugin.o 
    "_NPN_CreateObject", referenced from: 
     CPlugin::GetScriptableObject()  in plugin.o 
    "_NPN_GetStringIdentifier", referenced from: 
     _NPP_New in npp_gate.o 
     _NPP_New in npp_gate.o 
     CPlugin::CPlugin(_NPP*)in plugin.o 
     CPlugin::CPlugin(_NPP*)in plugin.o 
     CPlugin::CPlugin(_NPP*)in plugin.o 
     CPlugin::CPlugin(_NPP*)in plugin.o 
     CPlugin::CPlugin(_NPP*)in plugin.o 
     CPlugin::CPlugin(_NPP*)in plugin.o 
    "_NPN_InvalidateRect", referenced from: 
     CPluginData::Refresh(bool) in CTPlugin.o 
    "_NPN_RetainObject", referenced from: 
     CPlugin::GetScriptableObject()  in plugin.o 

我真的不明白我做了什么不好的！ 我错过了图书馆链接？在此先感谢=）

编辑：添加代码示例，从String2Variant在plugin.o的_NPN_MemAlloc：

static void String2Variant(NPVariant *result, LPCTSTR value) 
    { 
     if (value) 
     { 
      ClassUnicode cu; 
      char *utf8String = cu.CurrentModeToUTF8(value); 

      uint32 len = (uint32) strlen(utf8String); 
      char *clone = (char *)NPN_MemAlloc(len+1); 
      memcpy(clone,utf8String,len); 
      clone[len] = '\0'; 
     } else 
     { 
      result->type = NPVariantType_String; 
      result->value.stringValue.UTF8Characters = NULL; 
      result->value.stringValue.UTF8Length = 0; 
     } 
    } 

Answer 1

没有库，它提供NPN_MemAlloc，它实际上是你的回调之一当浏览器调用NP_Initialize时。你需要存储aNPNFuncs参数，这样就可以在以后使用它：当你需要调用NPN_MemAlloc你做这样的

static NPNetscapeFuncs *sBrowserFuncs; 

NPError NP_Initialize(NPNetscapeFuncs *aNPNFuncs, NPPluginFuncs *aNPPFuncs) 
{ 
    // Sanity checks go here 

    sBrowserFuncs = aNPNFuncs; 
} 

：

sBrowserFuncs->memalloc(len+1); 

或者你实际上定义功能NPN_MemAlloc中， test plugin这样做：

void* 
NPN_MemAlloc(uint32_t size) 
{ 
    return sBrowserFuncs->memalloc(size); 
}