在Winforms中使用DirectShow

如何解决在Winforms中使用DirectShow

| 我可以在c ++ win32控制台应用程序中运行“如何播放文件”代码示例，但是当我尝试通过winforms实现它时，出现以下链接错误：错误2错误LNK2020：无法解析的令牌（0A000016）IID_IMediaEvent 错误3错误LNK2020：无法解析的令牌（0A000017）IID_IMediaControl 和更多的链接错误..... 这是形式的代码：

#include <dshow.h>
#pragma comment(lib,\"Strmiids.lib\")

namespace Form1 {

    using namespace System;
    using namespace System::ComponentModel;
    using namespace System::Collections;
    using namespace System::Windows::Forms;
    using namespace System::Data;
    using namespace System::Drawing;

    /// <summary>
    /// Summary for Form1
    /// </summary>
    public ref class Form1 : public System::Windows::Forms::Form
    {
    public:
        Form1(void)
        {
            InitializeComponent();
            //
            //TODO: Add the constructor code here
            //
        }

    protected:
        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        ~Form1()
        {
            if (components)
            {
                delete components;
            }
        }

    private:
        /// <summary>
        /// Required designer variable.
        /// </summary>
        System::ComponentModel::Container ^components;

#pragma region Windows Form Designer generated code
        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        void InitializeComponent(void)
        {
            this->SuspendLayout();
            // 
            // Form1
            // 
            this->AutoScaleDimensions = System::Drawing::SizeF(6,13);
            this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
            this->ClientSize = System::Drawing::Size(284,262);
            this->Name = L\"Form1\";
            this->Text = L\"Form1\";
            this->Load += gcnew System::EventHandler(this,&Form1::Form1_Load);
            this->ResumeLayout(false);

        }
#pragma endregion
private: System::Void Form1_Load(System::Object^  sender,System::EventArgs^  e) 
{
 IGraphBuilder *pGraph = NULL;
    IMediaControl *pControl = NULL;
    IMediaEvent   *pEvent = NULL;

    // Initialize the COM library.
    HRESULT hr = CoInitialize(NULL);

    // Create the filter graph manager and query for interfaces.
    hr = CoCreateInstance(CLSID_FilterGraph,NULL,CLSCTX_INPROC_SERVER,IID_IGraphBuilder,(void **)&pGraph);

    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\"C:\\\\Example.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();
}
};
}

如何在Winforms中设置构建环境以进行DirectShow编程？我正在使用Windows SDK v7.1和vc ++ 2010

解决方法

您没有得到很好的诊断。问题在于DirectShow是本机代码。但是您让编译器认为可以在托管模式下进行编译是可以的。直到连接器开始俯冲之前，它的工作都非常好。您需要使其如下所示：

#pragma once
#pragma managed(push,off)
#include <dshow.h>
#pragma managed(pop)
#pragma comment(lib,\"strmiids.lib\")
#pragma comment(lib,\"ole32.lib\")
// etc..

这可能会产生大量错误。右键单击“解决方案资源管理器”窗口中的项目，依次单击“属性”，“配置属性”，“常规”。将公共语言运行时支持从/ clr：pure更改为/ clr。当我尝试它时，它正确播放了一个示例.avi文件。在DirectShow窗口中，而不是在窗体中。该示例代码仅设计用于控制台应用程序。您还应该删除对CoInitialize和CoUninitialize的调用，.NET已初始化COM。改善错误处理是可取的。考虑改为嵌入Windows Media Player。

在Winforms中使用DirectShow

如何解决在Winforms中使用DirectShow

解决方法

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