c# 根据句柄截取指定窗口的图片并保存 我要完整代码 我只要一个类

在 C# 中，你可以使用 `System.Drawing` 和 `Windows.Forms` 库来截取指定窗口的图片并保存到本地。以下是一个简单的自包含类 `WindowCapture`，它实现了这个功能：

using System;
using System.Drawing;
using System.Runtime.InteropServices;
using System.Windows.Forms;

public class WindowCapture : IDisposable
{
    private IntPtr hWnd; // 指定的窗口句柄
    private bool isDisposed;

    public WindowCapture(IntPtr hWndToCapture) {
        if (hWndToCapture == IntPtr.Zero)
            throw new ArgumentException("Invalid window handle");

        this.hWnd = hWndToCapture;
        this.isDisposed = false;
    }

    ~WindowCapture() {
        Dispose(false);
    }

    public void CaptureAndSave(string outputFilePath) {
        if (isDisposed || hWnd == IntPtr.Zero)
            return;

        var screenRectangle = GetWindowRect(hWnd);
        using (var screenCapture = new Bitmap(screenRectangle.Width, screenRectangle.Height))
        {
            using (Graphics graphics = Graphics.FromImage(screenCapture))
            {
                graphics.CopyFromScreen(hWnd, Point.Empty, screenRectangle);
            }
            screenCapture.Save(outputFilePath, ImageFormat.Png); // 可以替换为其他格式如JPG、BMP等
        }
    }

    [DllImport("user32.dll")]
    private static extern bool GetWindowRect(IntPtr hWnd, out RECT lpRect);

    [StructLayout(LayoutKind.Sequential)]
    private struct RECT
    {
        public int Left;
        public int Top;
        public int Right;
        public int Bottom;
    }

    public void Dispose()
    {
        Dispose(true);
        GC.SuppressFinalize(this);
    }

    protected virtual void Dispose(bool disposing)
    {
        if (!isDisposed)
        {
            if(disposing)
            {
                // 释放托管资源
            }
            
            // 释放非托管资源
            hWnd = IntPtr.Zero;
            isDisposed = true;
        }
    }

    //