我正在使用Visual Studio 2008为带有Windows Mobile 6.1的设备开发SmartDevice Win32 DLL。我必须使用DirectShow,并且开始再现基本示例。.h
:
#pragma once
// Additional Include Directories:
// "C:\Program Files (x86)\Windows Mobile 6 SDK\Smartphone\Include\Armv4i"
#include <dshow.h>
// Included strmiids.lib for CLSID_FilterGraph and IID_IGraphBuilder (.cpp)
#pragma comment(lib, "strmiids.lib")
extern "C" {
__declspec(dllexport) bool InitCOM();
}
和
.cpp
:#include "stdafx.h"
#include "DLLDevice.h"
BOOL APIENTRY DllMain( HANDLE hModule,
DWORD ul_reason_for_call,
LPVOID lpReserved
)
{
return TRUE;
}
__declspec(dllexport) bool InitCOM()
{
if(FAILED(CoInitialize(NULL)))
return false;
IGraphBuilder* pGraphBuilder = NULL;
HRESULT hr = CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER,
IID_IGraphBuilder, (void**) &pGraphBuilder);
if(FAILED(hr))
return false;
IMediaControl *pMediaControl = NULL;
hr = pGraphBuilder->QueryInterface(IID_MediaControl, (void**) &pMediaControl);
pGraphBuilder->Release();
return true;
}
现在我有一个链接器错误:
error C2065: 'IID_MediaControl' : undeclared identifier
为什么?我怎么解决这个问题?
因此,为什么无法使用DirectShow创建项目?
最佳答案
因为它是IID_IMediaControl
,而不是IID_MediaControl
。
关于c++ - IID_MediaControl未声明的标识符,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/12883895/