//DirectShow應用程序的三個步驟
//1：建立圖像濾鏡管理器的實例
//2:用圖像濾鏡管理器建立一個圖像濾鏡
//3：給其運行消息，讓數據流在各個濾鏡中移動
//!!!!!!!!!!!!!!!!! 添加相應的庫後 此程序沒問題
//工程->設置->鏈接，添加strmbasd.lib ole32.lib
#include <dshow.h>
#include <stdio.h>
void main(void)
{
IGraphBuilder *pGraph = NULL; //圖像濾鏡管理器
IMediaControl *pControl = NULL; //控制數據流
IMediaEvent *pEvent = NULL; //獲取圖像濾鏡的事件
// Initialize the COM library.
// printf("ff\n"); //用於調試 查找何處有問題
HRESULT hr = CoInitialize(NULL); //初始化com庫
if (FAILED(hr))
{
printf("ERROR - Could not initialize COM library");
return;
}
// Create the filter graph manager and query for interfaces.
hr = CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER, //創建圖像濾鏡管理器
IID_IGraphBuilder, (void **)&pGraph);
if (FAILED(hr))
{
printf("ERROR - Could not create the Filter Graph Manager.");
return;
}
// printf("ff1\n");
hr = pGraph->QueryInterface(IID_IMediaControl, (void **)&pControl); //查詢接口
hr = pGraph->QueryInterface(IID_IMediaEvent, (void **)&pEvent);
// printf("ff2\n");
// Build the graph. IMPORTANT: Change this string to a file on your system. 改變視頻地址
hr = pGraph->RenderFile(L"zhanguo.avi", NULL); //將視頻拷貝到當前工程目錄下
// printf("ff3\n");
if (SUCCEEDED(hr))
{
// printf("ff4\n");
// Run the graph.
hr = pControl->Run();
if (SUCCEEDED(hr))
{
// Wait for completion.
long evCode;
pEvent->WaitForCompletion(INFINITE, &evCode); //等待視頻結束
printf("ff");
// Note: Do not use INFINITE in a real application, because it
// can block indefinitely.
}
}
pControl->Release(); //釋放藉口
pEvent->Release();
pGraph->Release();
CoUninitialize(); //關閉com口
}