适用于Chrome的NPAPI插件无法通过NP_Initialize

我一直在尝试为Chrome编写一个使用NPAPI插件的扩展。我使用mingw来编译它。我最初挣扎着让Chrome加载插件，但现在我有一个不同的问题。

我已经设法让Chrome调用NP_GetEntryPoints和NP_Initialize，但它崩溃之后。这是我到目前为止的代码…

main.cpp :

#include <iostream>
#include <cstdlib>
#include <Windows.h>
#include <npapi.h>
#include <npfunctions.h>
#define Exported extern "C" __declspec(dllexport)
NPNetscapeFuncs NPNFuncs;
Exported NPError NP_Initialize(NPNetscapeFuncs* pFuncs) {
    if (pFuncs == NULL)
        return NPERR_INVALID_FUNCTABLE_ERROR;
    if (HIBYTE(pFuncs->version) > NP_VERSION_MAJOR)
        return NPERR_INCOMPATIBLE_VERSION_ERROR;
    if (pFuncs->size < sizeof(NPNetscapeFuncs))
        return NPERR_INVALID_FUNCTABLE_ERROR;
    // Save functions
    NPNFuncs.size             = pFuncs->size;
    NPNFuncs.version          = pFuncs->version;
    NPNFuncs.geturlnotify     = pFuncs->geturlnotify;
    NPNFuncs.geturl           = pFuncs->geturl;
    NPNFuncs.posturlnotify    = pFuncs->posturlnotify;
    NPNFuncs.posturl          = pFuncs->posturl;
    NPNFuncs.requestread      = pFuncs->requestread;
    NPNFuncs.newstream        = pFuncs->newstream;
    NPNFuncs.write            = pFuncs->write;
    NPNFuncs.destroystream    = pFuncs->destroystream;
    NPNFuncs.status           = pFuncs->status;
    NPNFuncs.uagent           = pFuncs->uagent;
    NPNFuncs.memalloc         = pFuncs->memalloc;
    NPNFuncs.memfree          = pFuncs->memfree;
    NPNFuncs.memflush         = pFuncs->memflush;
    NPNFuncs.reloadplugins    = pFuncs->reloadplugins;
    NPNFuncs.getJavaEnv       = pFuncs->getJavaEnv;
    NPNFuncs.getJavaPeer      = pFuncs->getJavaPeer;
    NPNFuncs.getvalue         = pFuncs->getvalue;
    NPNFuncs.setvalue         = pFuncs->setvalue;
    NPNFuncs.invalidaterect   = pFuncs->invalidaterect;
    NPNFuncs.invalidateregion = pFuncs->invalidateregion;
    NPNFuncs.forceredraw      = pFuncs->forceredraw;*/
    // Success
    MessageBoxA(0, "NP_Initialize", "Log", 0);
    return NPERR_NO_ERROR;
}
Exported void NP_Shutdown() {
    MessageBoxA(0, "NP_Shutdown", "Log", 0);
}
    /* Entry points */
    NPError NPP_New(NPMIMEType pluginType, NPP instance, uint16_t mode, int16_t argc, char* argn[], char* argv[], NPSavedData* savedData) {
        MessageBoxA(0, "NPP_New", "Log", 0);
        return NPERR_NO_ERROR;
    }
    NPError NPP_GetValue(NPP instance, NPPVariable variable, void *value) {
        MessageBoxA(0, "NPP_GetValue", "Log", 0);
        return NPERR_NO_ERROR;
    }
    /*** Omitted... All the other functions are here, with just a MessageBox call in them ***/
Exported NPError NP_GetEntryPoints(NPPluginFuncs* pFuncs) {
    if (pFuncs == NULL)
        return NPERR_INVALID_FUNCTABLE_ERROR;
    if (pFuncs->size < sizeof(NPPluginFuncs))
        return NPERR_INVALID_FUNCTABLE_ERROR;
    pFuncs->size                = sizeof(NPPluginFuncs);
    pFuncs->version             = (NP_VERSION_MAJOR << 8) | NP_VERSION_MINOR;
    pFuncs->newp                = &NPP_New;
    pFuncs->destroy             = &NPP_Destroy;
    pFuncs->setwindow           = &NPP_SetWindow;
    pFuncs->newstream           = &NPP_NewStream;
    pFuncs->destroystream       = &NPP_DestroyStream;
    pFuncs->asfile              = &NPP_StreamAsFile;
    pFuncs->writeready          = &NPP_WriteReady;
    pFuncs->write               = &NPP_Write;
    pFuncs->print               = &NPP_Print;
    pFuncs->event               = &NPP_HandleEvent;
    pFuncs->urlnotify           = &NPP_URLNotify;
    pFuncs->getvalue            = &NPP_GetValue;
    pFuncs->setvalue            = &NPP_SetValue;
    pFuncs->javaClass           = NULL;
    pFuncs->gotfocus            = &NPP_GotFocus;
    pFuncs->lostfocus           = &NPP_LostFocus;
    pFuncs->urlredirectnotify   = &NPP_URLRedirectNotify;
    pFuncs->clearsitedata       = &NPP_ClearSiteData;
    pFuncs->getsiteswithdata    = &NPP_GetSitesWithData;
    MessageBoxA(0, "NP_GetEntryPoints", "Log", 0);
    return NPERR_NO_ERROR;
}

我为每个函数添加了一个MessageBox调用，这样我就可以看到是否调用了正确的函数。当我运行我的测试页面时，这是一个带有<embed>标签的空白页面，我得到一条消息说NP_GetEntryPoints，然后一个说NP_Initialize，然后Chrome弹出一个栏，说我的插件已经崩溃了。我想问题出在我的NP_GetEntryPoints上，但我就是看不出来……我做错了什么，或者忘记做什么了吗?

我用:

g++.exe -DWIN32 -D_WIN32 -D_WINDOWS -D_WIN32_WINNT=0x0600 -D_WIN32_IE=0x0600 -D_UNICODE -DUNICODE -static-libgcc -static-libstdc++ -c "main.cpp" -o main.o

和

windres.exe "resource.rc" "resource.o"

和I链接到.DLL中:

g++.exe -Wl,--subsystem,windows -o "npplugin.dll" -s -shared main.o resource.o -lcomctl32 -lws2_32 -luxtheme -lgdi32 -lshell32 -lshlwapi