Question

我正在尝试为Mac OSX构建一个Firefox插件，它构建得很好，但我不明白链接器失败的原因。

以下是链接器的日志：

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

我真的不明白我做错了什么！我错过了要链接的库吗？在此先感谢=）

编辑：为plugin.o中的String2Variant的_NPN_MemAlloc添加代码示例：

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

没有提供NPN_MemAlloc的库，它实际上是浏览器调用NP_Initialize时获得的回调之一。您需要存储aNPNFuncs参数，以便以后可以使用它：

static NPNetscapeFuncs *sBrowserFuncs;

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

   sBrowserFuncs = aNPNFuncs;
}

当您需要致电NPN_MemAlloc时，您可以这样做：

sBrowserFuncs->memalloc(len+1);

或者您实际定义了NPN_MemAlloc函数，test plugin的方式：

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

Firefox NPAPI Xcode链接错误

1 个答案: