创建无边界的DirectShow窗口

Create borderless DirectShow Window

本文关键字：DirectShow 窗口 边界 创建      更新时间：2023-10-16

我指的是这里提供的使用DirectShow示例的简单视频播放器。

代码运行和构建，但我需要使视频播放器窗口无边界。

我找不到一个参数来设置CoCreateInstance函数或CoInitialize函数，我可以设置使窗口无边界。

这里是我的完整代码供参考:

#include <dshow.h>
#pragma comment (lib, "strmiids.lib")
void main(void)
{
    IGraphBuilder *pGraph = NULL;
    IMediaControl *pControl = NULL;
    IMediaEvent   *pEvent = NULL;
    // Initialize the COM library.
    HRESULT hr = CoInitialize(NULL);
    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,
        IID_IGraphBuilder, (void **)&pGraph);
    if (FAILED(hr))
    {
        printf("ERROR - Could not create the Filter Graph Manager.");
        return;
    }
    hr = pGraph->QueryInterface(IID_IMediaControl, (void **)&pControl);
    hr = pGraph->QueryInterface(IID_IMediaEvent, (void **)&pEvent);
    // Build the graph. IMPORTANT: Change this string to a file on your system.
    hr = pGraph->RenderFile(L"D:\dfs.avi", NULL);
    if (SUCCEEDED(hr))
    {
        // Run the graph.
        hr = pControl->Run();
        if (SUCCEEDED(hr))
        {
            // Wait for completion.
            long evCode;
            pEvent->WaitForCompletion(INFINITE, &evCode);
            // Note: Do not use INFINITE in a real application, because it
            // can block indefinitely.
        }
    }
    pControl->Release();
    pEvent->Release();
    pGraph->Release();
    CoUninitialize();
}

为了实现这一点，我需要添加什么额外的代码片段?

我在这里找到了完成这项工作的代码!

#pragma comment(lib, "strmiids.lib")
#pragma comment(lib, "quartz.lib")
#include <string>
#include <dshow.h>

int PlayVideo(const std::string& pFile)
{
    IGraphBuilder* pGraph = NULL;
    IVideoWindow* pWin = NULL;
    IMediaControl* pControl = NULL;
    IMediaEvent* pEvent = NULL;
    // Initialize the COM library.
    HRESULT hr = CoInitialize(NULL);
    if (FAILED(hr)) return 1;
    // Create the filter graph manager and query for interfaces.
    hr = CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER, IID_IGraphBuilder, (void **)&pGraph);
    if (FAILED(hr)) return 1;
    // Get interfaces
    hr = pGraph->QueryInterface(IID_IMediaControl, (void **)&pControl);
    hr = pGraph->QueryInterface(IID_IMediaEvent, (void **)&pEvent);
    hr = pGraph->QueryInterface(IID_IVideoWindow, (void **)&pWin);
    // Build the graph (convert unicode filename)
    size_t _size = mbstowcs(NULL,pFile.c_str(),2); // Add 2 for ZT
    wchar_t* _wfile = new wchar_t[_size + 2];
    _size = mbstowcs(_wfile, pFile.c_str(), pFile.length() + 1); // Add 1 for ZT
    hr = pGraph->RenderFile(_wfile, NULL);
    delete[] _wfile;
    // Uncomment next line for borderless window display
    pWin->put_WindowStyle(WS_CHILD | WS_CLIPSIBLINGS);
    // For fullscreen play, get Windows screen parameters and replace
    pWin->SetWindowPosition(0, 0, 800, 600);
    if (SUCCEEDED(hr))
    {
        hr = pControl->Run();
        if (SUCCEEDED(hr))
        {
            long evCode;
            pEvent->WaitForCompletion(INFINITE, &evCode);
        }
    }
    pControl->Release();
    pEvent->Release();
    pWin->Release();
    pGraph->Release();
    CoUninitialize();
    return 0;
}

int main()
{
    PlayVideo("D:\dfs.avi"); // play any format Windows can handle, avi/mpg etc.
    return 0;
}
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