我需要一些关于如何在Windows 7上更新Maya 2014外部Web浏览器插件的建议。该插件最后一次更新于2008年，可以在Firefox 3等旧版浏览器中完美运行。但是，任何后续浏览器（Firefox 3.5到26）立即打破插件。
我在firebug中遇到的错误是：
Error: Error calling method on NPObject! return MWTObject.execute(CommandText)
我是API编程的完全新手，并且在这个问题上我已经掌握了。我认为错误是由于NPP_GetValue被调用2次并且插件无法处理它。 main.cpp如下：
//-
// ==========================================================================
// Copyright 1995,2006,2008 Autodesk, Inc. All rights reserved.
//
// Use of this software is subject to the terms of the Autodesk
// license agreement provided at the time of installation or download,
// or which otherwise accompanies this software in either electronic
// or hard copy form.
// ==========================================================================
//+
#include "mcp.h"
#include "PluginObject.h"
NPNetscapeFuncs *browser;
NPNetscapeFuncs NPNFuncs;
NPError NPP_New(NPMIMEType pluginType, NPP instance, uint16 mode, int16 argc, char* argn[], char* argv[], NPSavedData* saved);
NPError NPP_Destroy(NPP instance, NPSavedData** save);
NPError NPP_SetWindow(NPP instance, NPWindow* window);
NPError NPP_NewStream(NPP instance, NPMIMEType type, NPStream* stream, NPBool seekable, uint16* stype);
NPError NPP_DestroyStream(NPP instance, NPStream* stream, NPReason reason);
int32 NPP_WriteReady(NPP instance, NPStream* stream);
int32 NPP_Write(NPP instance, NPStream* stream, int32 offset, int32 len, void* buffer);
void NPP_StreamAsFile(NPP instance, NPStream* stream, const char* fname);
void NPP_Print(NPP instance, NPPrint* platformPrint);
int16 NPP_HandleEvent(NPP instance, void* event);
void NPP_URLNotify(NPP instance, const char* URL, NPReason reason, void* notifyData);
NPError NPP_GetValue(NPP instance, NPPVariable variable, void *value);
NPError NPP_SetValue(NPP instance, NPNVariable variable, void *value);
char *NPP_GetMIMEDescription(void) {
return "application/x-mcp::MCP Plugin";
}
NPError OSCALL 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;
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;
NPNFuncs.getstringidentifier = pFuncs->getstringidentifier;
NPNFuncs.getstringidentifiers = pFuncs->getstringidentifiers;
NPNFuncs.getintidentifier = pFuncs->getintidentifier;
NPNFuncs.identifierisstring = pFuncs->identifierisstring;
NPNFuncs.utf8fromidentifier = pFuncs->utf8fromidentifier;
NPNFuncs.intfromidentifier = pFuncs->intfromidentifier;
NPNFuncs.createobject = pFuncs->createobject;
NPNFuncs.retainobject = pFuncs->retainobject;
NPNFuncs.releaseobject = pFuncs->releaseobject;
NPNFuncs.invoke = pFuncs->invoke;
NPNFuncs.invokeDefault = pFuncs->invokeDefault;
NPNFuncs.evaluate = pFuncs->evaluate;
NPNFuncs.getproperty = pFuncs->getproperty;
NPNFuncs.setproperty = pFuncs->setproperty;
NPNFuncs.removeproperty = pFuncs->removeproperty;
NPNFuncs.hasproperty = pFuncs->hasproperty;
NPNFuncs.hasmethod = pFuncs->hasmethod;
NPNFuncs.releasevariantvalue = pFuncs->releasevariantvalue;
NPNFuncs.setexception = pFuncs->setexception;
browser = &NPNFuncs;
return NPERR_NO_ERROR;
}
NPError OSCALL NP_GetEntryPoints(NPPluginFuncs* pluginFuncs)
{
if(pluginFuncs == NULL)
return NPERR_INVALID_FUNCTABLE_ERROR;
if(pluginFuncs->size < sizeof(NPPluginFuncs))
return NPERR_INVALID_FUNCTABLE_ERROR;
pluginFuncs->version = (NP_VERSION_MAJOR << 8) | NP_VERSION_MINOR;
pluginFuncs->size = sizeof(NPPluginFuncs);
pluginFuncs->newp = NPP_New;
pluginFuncs->destroy = NPP_Destroy;
pluginFuncs->setwindow = NPP_SetWindow;
pluginFuncs->newstream = NPP_NewStream;
pluginFuncs->destroystream = NPP_DestroyStream;
pluginFuncs->asfile = NPP_StreamAsFile;
pluginFuncs->writeready = NPP_WriteReady;
pluginFuncs->write = NPP_Write;
pluginFuncs->print = NPP_Print;
pluginFuncs->event = NPP_HandleEvent;
pluginFuncs->urlnotify = NPP_URLNotify;
pluginFuncs->getvalue = NPP_GetValue;
pluginFuncs->setvalue = NPP_SetValue;
pluginFuncs->javaClass = NULL;
return NPERR_NO_ERROR;
}
NPError OSCALL NP_Shutdown(void)
{
return NPERR_NO_ERROR;
}
NPError NPP_New(NPMIMEType pluginType, NPP instance, uint16 mode, int16 argc, char* argn[], char* argv[], NPSavedData* saved)
{
if (browser->version >= 14)
instance->pdata = browser->createobject (instance, getPluginClass());
return NPERR_NO_ERROR;
}
NPError NPP_Destroy(NPP instance, NPSavedData** save)
{
PluginObject *obj = (PluginObject *)instance->pdata;
return NPERR_NO_ERROR;
}
NPError NPP_SetWindow(NPP instance, NPWindow* window)
{
PluginObject *obj = (PluginObject *)instance->pdata;
// Do nothing if browser didn't support NPN_CreateObject which would have created the PluginObject.
if (obj != NULL) {
obj->window = window;
}
return NPERR_NO_ERROR;
}
NPError NPP_NewStream(NPP instance, NPMIMEType type, NPStream* stream, NPBool seekable, uint16* stype)
{
return NPERR_NO_ERROR;
}
NPError NPP_DestroyStream(NPP instance, NPStream* stream, NPReason reason)
{
return NPERR_NO_ERROR;
}
int32 NPP_WriteReady(NPP instance, NPStream* stream)
{
return 0;
}
int32 NPP_Write(NPP instance, NPStream* stream, int32 offset, int32 len, void* buffer)
{
return 0;
}
void NPP_StreamAsFile(NPP instance, NPStream* stream, const char* fname)
{
}
void NPP_Print(NPP instance, NPPrint* platformPrint)
{
}
int16 NPP_HandleEvent(NPP instance, void* event)
{
return 0;
}
void NPP_URLNotify(NPP instance, const char* url, NPReason reason, void* notifyData)
{
}
NPError NPP_GetValue(NPP instance, NPPVariable variable, void *value)
{
if(instance == NULL)
return NPERR_INVALID_INSTANCE_ERROR;
if (variable == NPPVpluginScriptableNPObject) {
void **v = (void **)value;
PluginObject *obj = (PluginObject *)instance->pdata;
// Increase reference count
obj->referenceCount++;
*v = obj;
return NPERR_NO_ERROR;
}
return NPERR_GENERIC_ERROR;
}
NPError NPP_SetValue(NPP instance, NPNVariable variable, void *value)
{
return NPERR_GENERIC_ERROR;
}
我不知道这是否足以诊断问题，但任何帮助都会非常感激。如果有人想查看此插件的完整源代码，可以在deva / externalwebbrowser / windows中的Maya安装目录中找到它（当然，如果你有Maya）