IGraphBuilder :: RenderFile（）失败与VFW_E_BAD_KEY - 0x800403f2 [英] IGraphBuilder::RenderFile() failing with VFW_E_BAD_KEY - 0x800403f2

问题描述

继续调查嵌入式WindowsMediaPlayer问题，i我尝试通过DirectShow进程内服务器进行简单的文件播放：

  :: CoInitializeEx（0，COINIT_MULTITHREADED）; 
 
 CComPtr< IGraphBuilder> spGraph; 
 spGraph.CoCreateInstance（CLSID_FilterGraph，0，CLSCTX_INPROC_SERVER）; 
 CComQIPtr  spMediaControl（spGraph）; 
 
 // ... later：
 spGraph-> RenderFile（Lc：\\foo.wav，0）; //与VFW_E_BAD_KEY失败
 spMediaControl-> Run（）;有趣的是，在我测试的两个系统（Windows XP 32& x64）上运行的时候，这个操作都很好。 
 
但是在我真正使用的情况下，一个基于NPAPI的浏览器插件（即加载到Firefox / Chrome / Opera中的DLL）失败。
 
 
 
有没有人知道这里可能出现什么问题？
 
或者想要尝试什么？
 
 
 
在更新 nofollow> Microsoft论坛。 
 
 
 
  Update2： 
 
  IGraphBuilder :: AddSourceFilter（path，path，& base） 已经失败，并发生以下注册表调用（如进程监视器中所示）：
 
RegOpenKey \Software\Classes \c，NAME NOT FOUND，Desired Access：Query Value，Maximum Allowed
RegOpenKey，HKCU\Software\Classes \Media Type\Extensions \.wav，NAME NOT FOUND，Desired Access：Read
RegOpenKey，HKCU \Software \Classes \Media Type，NAME NOT FOUND，Desired Access：阅读
 
 
 
解决方案
正在从错误的蜂巢读取密钥。它应该使用HKLM，而不是HKCU。最可能的原因是注册表虚拟化。 
 
Continuing investigation on a embedded WindowsMediaPlayer problem, i am trying to do simple file playback via a DirectShow in-process server:
::CoInitializeEx(0, COINIT_MULTITHREADED);

CComPtr<IGraphBuilder> spGraph;
spGraph.CoCreateInstance(CLSID_FilterGraph, 0, CLSCTX_INPROC_SERVER);
CComQIPtr<IMediaControl> spMediaControl(spGraph);

// ... later:
spGraph->RenderFile(L"c:\\foo.wav", 0); // fails with VFW_E_BAD_KEY
spMediaControl->Run();
Interestingly, this runs fine on both systems i tested on (Windows XP 32 & x64) when doing it in a stand-alone application.

It however fails in my real use-case, a NPAPI based browser plugin - i.e. a DLL loaded into Firefox/Chrome/Opera.

Does anyone have an idea what could be going wrong here?

Or ideas on what else to try?

Update: also asked on the Microsoft forums.  

Update2:

IGraphBuilder::AddSourceFilter(path,path,&base) already fails with the following registry calls (as seen in process monitor):
"RegOpenKey","HKCU\Software\Classes\c","NAME NOT FOUND","Desired Access: Query Value, Maximum Allowed" 
"RegOpenKey","HKCU\Software\Classes\Media Type\Extensions\.wav","NAME NOT FOUND","Desired Access: Read" 
"RegOpenKey","HKCU\Software\Classes\Media Type","NAME NOT FOUND","Desired Access: Read"

解决方案
It is reading the key from the wrong hive.  It should use HKLM, not HKCU.  The most likely reason for this is registry virtualization.  

                        
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