是否有调整面板和视频大小以进行播放的技巧

Posted 2023-02-25

【中文标题】是否有调整面板和视频大小以进行播放的技巧

【英文标题】：Is there a trick to resizing a panel and video for playback

【发布时间】：2019-01-25 15:42:28

【问题描述】：

我正在使用 directx.audiovideoplayback 播放 avi，我想让它的视频大小为 320x240（它的实际大小为 1260x876），但是当我执行它看起来应该执行的操作时，这不会发生。我还尝试为 TextureReadyToRender 事件附加一个事件处理程序，但在播放视频时似乎没有触发。 Microsoft 的文档帮助不大。

我相应地设置了视频和面板尺寸，并按照规定附加了一个事件处理程序。

#pragma once
#include "metahost.h"

namespace PlaAVIviaDirectX 

using namespace System;
using namespace System::ComponentModel;
using namespace System::Collections;
using namespace System::Windows::Forms;
using namespace System::Data;
using namespace System::Drawing;
using namespace Microsoft::DirectX::AudioVideoPlayback;
using namespace System::Configuration;

/// <summary>
/// Summary for Form1
/// </summary>
public ref class Form1 : public System::Windows::Forms::Form

public:
    Form1(void)
    
        InitializeComponent();
        //
        //TODO: Add the constructor code here
        //
        System::Drawing::Size vSize = System::Drawing::Size(320,240);
        panel1->Width = 320;
        panel1->Height = 240;
        video = gcnew Microsoft::DirectX::AudioVideoPlayback::Video("D:\\SS-RICS Eric Stuff\\intro.avi");
        video->TextureReadyToRender += gcnew Microsoft::DirectX::AudioVideoPlayback::TextureRenderEventHandler(this, &Form1::FrameHandler);
        video->DefaultSize = vSize;
        video->Owner = panel1;
        //video->TextureReadyToRender += gcnew Microsoft::DirectX::AudioVideoPlayback::TextureRenderEventHandler(this, &Form1::FrameHandler);
    

protected:
    /// <summary>
    /// Clean up any resources being used.
    /// </summary>
    ~Form1()
    
        if (components)
        
            delete components;
        
    
private: Microsoft::DirectX::AudioVideoPlayback::Video^ video;
private: System::Windows::Forms::Panel^  panel1;
protected: 
private: System::Windows::Forms::Button^  button1;
private: System::Windows::Forms::Button^  button2;
private: System::Windows::Forms::Button^  button3;

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->panel1 = (gcnew System::Windows::Forms::Panel());
        this->button1 = (gcnew System::Windows::Forms::Button());
        this->button2 = (gcnew System::Windows::Forms::Button());
        this->button3 = (gcnew System::Windows::Forms::Button());
        this->SuspendLayout();
        // 
        // panel1
        // 
        this->panel1->Location = System::Drawing::Point(12, 12);
        this->panel1->Name = L"panel1";
        this->panel1->Size = System::Drawing::Size(320, 240);
        this->panel1->TabIndex = 0;
        // 
        // button1
        // 
        this->button1->Location = System::Drawing::Point(12, 314);
        this->button1->Name = L"button1";
        this->button1->Size = System::Drawing::Size(75, 23);
        this->button1->TabIndex = 1;
        this->button1->Text = L"play";
        this->button1->UseVisualStyleBackColor = true;
        this->button1->Click += gcnew System::EventHandler(this, &Form1::button1_Click);
        // 
        // button2
        // 
        this->button2->Location = System::Drawing::Point(12, 343);
        this->button2->Name = L"button2";
        this->button2->Size = System::Drawing::Size(75, 23);
        this->button2->TabIndex = 2;
        this->button2->Text = L"pause";
        this->button2->UseVisualStyleBackColor = true;
        this->button2->Click += gcnew System::EventHandler(this, &Form1::button2_Click);
        // 
        // button3
        // 
        this->button3->Location = System::Drawing::Point(12, 372);
        this->button3->Name = L"button3";
        this->button3->Size = System::Drawing::Size(75, 23);
        this->button3->TabIndex = 3;
        this->button3->Text = L"stop";
        this->button3->UseVisualStyleBackColor = true;
        this->button3->Click += gcnew System::EventHandler(this, &Form1::button3_Click);
        // 
        // Form1
        // 
        this->AutoScaleDimensions = System::Drawing::SizeF(6, 13);
        this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
        this->ClientSize = System::Drawing::Size(347, 407);
        this->Controls->Add(this->button3);
        this->Controls->Add(this->button2);
        this->Controls->Add(this->button1);
        this->Controls->Add(this->panel1);
        this->Name = L"Form1";
        this->Text = L"Form1";
        this->ResumeLayout(false);

    
#pragma endregion
private: void FrameHandler(Object^ sender, Microsoft::DirectX::AudioVideoPlayback::TextureRenderEventArgs^ e)
         
             Microsoft::DirectX::Direct3D::Texture^ frame = e->Texture;
             System::Diagnostics::Trace::WriteLine("texture");
         
private: System::Void button1_Click(System::Object^  sender, System::EventArgs^  e) 
             video->Play();
         
private: System::Void button2_Click(System::Object^  sender, System::EventArgs^  e) 
             video->Pause();
         
private: System::Void button3_Click(System::Object^  sender, System::EventArgs^  e) 
         video->Stop();
     
;

我希望看到一个大小相称的视频和输出，表明事件处理程序正在工作。

【问题讨论】：

请忽略以下行：video->DefaultSize = vSize;在构造函数中。这是试图设置一个只读且已被删除的值。我不知道如何编辑代码部分。

【参考方案1】：

好像有size成员（读/写）：

Video.Size Property