问关于一个Directshow的问题..

[Karja]

近期想使用DS和C++在VS中来写一个播放视频的小程序，但是发现播放的时候只有声音而没有图像。
查阅了很多网上的代码，貌似都是使用微软官网的一个SAMPLE。有用的信息也不多，外文网站大多都是使用C#或者版本比较老。所以东拼西凑的代码难免有问题。
我使用的是VRM的Windowless模式来播放，刚开始还以为是FILTER没有链接对，后来下载了FFSHOW的解码器安装并且利用GraphEdit来查看发现链接都是正确的，于是百思不得其解只好来这里求救了。还望各位多多指教
以下是代码：

//头文件
#include "Ra_Video.h"
//**********************************

//构造函数
Video::Video()
{
}

//设置
void Video::Setvideo(string filename,HWND hwnd,bool isfull)
{
	//设置可用
	this->avilable = false;

	//文件名
	this->name = filename;

	//窗口句柄
	this->windowshwnd = hwnd;

	//是否全屏
	this->isfullscreen = isfull;

	//设置COM
	CoInitialize(0);

	//创建滤波器
	CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER, IID_IGraphBuilder, (void**)&g_graph_builder);

	//设置控制接口
	g_graph_builder->QueryInterface(IID_IMediaControl, (void**)&g_media_control);

	//设置位置接口
	g_graph_builder->QueryInterface(IID_IMediaPosition,(void**)&g_media_position);

	//设置事件接口
	g_graph_builder->QueryInterface(IID_IMediaEvent, (void**)&g_media_event);

    //添加VRM
	InitWindowlessVMR(windowshwnd,g_graph_builder, &g_pWc);

	long lWidth, lHeight;

	//获得本地视频大小
	g_pWc->GetNativeVideoSize(&lWidth, &lHeight, NULL, NULL);

	// 设置Source尺寸
	SetRect(&rcSrc, 0, 0, lWidth, lHeight);

	// 获得显示窗体的客户区尺寸
	GetClientRect(windowshwnd, &rcDest);

	//设置destination尺寸
	SetRect(&rcDest, 0, 0, rcDest.right, rcDest.bottom);

	// 视频定位
	g_pWc->SetVideoPosition(&rcSrc,&rcDest);

	//设定位置
	g_media_position->put_CurrentPosition(0);

}

//播放
bool Video::Load()
{
	WCHAR w_filename[MAX_PATH] = {0};

	mbstowcs(w_filename, name.c_str(), MAX_PATH);

	// render the file
	g_graph_builder->RenderFile(w_filename, NULL);

	// play the file, switches the entire filter graph into a running state.
	this->g_media_control->Run();

	return TRUE;
}

//删除
bool Video::Delete()
{
	g_media_control->Stop();

	g_media_event->Release();
	g_media_event = NULL;

	g_media_position->Release();
	g_media_position = NULL;

	g_media_control->Release();
	g_media_control = NULL;

	CoUninitialize();
	return true;
}

//检查是否完成
bool Video::Iscomplete()
{
	long event_code, param1, param2;

	// retrieves the next notification event
	if(SUCCEEDED(this->g_media_event->GetEvent(&event_code, ¶m1, ¶m2, 1)))
	{
		if(event_code == EC_COMPLETE)
		{
			// frees resources associated with the parameters of an events.
			g_media_event->FreeEventParams(event_code, param1, param2);
			return true;
		}                
	}
	g_media_event->FreeEventParams(event_code, param1, param2);
	return false;
}

//添加VMR
HRESULT Video::InitWindowlessVMR(HWND hwndApp,IGraphBuilder* pGraph,IVMRWindowlessControl** ppWc)
{
	//if (!pGraph || !ppWc) return E_POINTER;

	IBaseFilter* pVmr = NULL;

	IVMRWindowlessControl* pWc = NULL;

	// 创建VMR
	CoCreateInstance(CLSID_VideoMixingRenderer, NULL,CLSCTX_INPROC, IID_IBaseFilter, (void**)&pVmr);

	// 把VMR添加到过滤器图表中
	pGraph->AddFilter(pVmr, L"Video Mixing Renderer");

	// 设置显示模式
	IVMRFilterConfig* pConfig;
	pVmr->QueryInterface(IID_IVMRFilterConfig, (void**)&pConfig);
	pConfig->SetRenderingMode(VMRMode_Windowless);
	pConfig->Release();
		
	// 设置窗体
	pVmr->QueryInterface(IID_IVMRWindowlessControl, (void**)&pWc);	
    pWc->SetVideoClippingWindow(hwndApp);
	
	//返回AddRef指针
	*ppWc = pWc;
	pVmr->Release();
    return NULL;
} 

//响应PAINT消息
void Video::Dopaint()
{
	PAINTSTRUCT ps;
	HDC         hdc;
	RECT        rcClient;
	RECT        g_rcDest;
	GetClientRect(windowshwnd, &rcClient);
	hdc = BeginPaint(windowshwnd, &ps);
	if (g_pWc != NULL)
	{
		g_rcDest=rcClient;
		// Find the region where the application can paint by subtracting
		// the video destination rectangle from the client area.
		// (Assume that g_rcDest was calculated previously.)

		HRGN rgnClient = CreateRectRgnIndirect(&rcClient);
		HRGN rgnVideo  = CreateRectRgnIndirect(&g_rcDest); 
		CombineRgn(rgnClient, rgnClient, rgnVideo, RGN_DIFF); 

		// Paint on window.
		HBRUSH hbr = GetSysColorBrush(COLOR_BTNFACE);
		FillRgn(hdc, rgnClient, hbr);

		// Clean up.
		DeleteObject(hbr);
		DeleteObject(rgnClient);
		DeleteObject(rgnVideo);

		// Request the VMR to paint the video.
		HRESULT hr = g_pWc->RepaintVideo(windowshwnd, hdc); 
	}
	else  // There is no video, so paint the whole client area.
	{
		//FillRect(hdc, &rc2, (HBRUSH)(COLOR_BTNFACE + 1));
	}
	EndPaint(windowshwnd, &ps); 
}

[Karja]

本身是嵌套在一个自己写的游戏引擎中的，所以窗口实现以及其他部分就不贴出了...太多了..

[gxing1339]

楼主，我也是遇到这个问题，你解决了吗