如何将 IPictureDisp 转换为 System.Drawing.Image

using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Runtime.InteropServices;

public static Image ConvertIPictureDispToImage(object picture)
{
    if (picture == null)
        throw new ArgumentNullException("picture");

    // 获取图片的句柄
    IntPtr hPal = GetStockObject(DEFAULT_PALETTE);
    IntPtr hdc = GetDC(IntPtr.Zero);
    IntPtr hdcMem = CreateCompatibleDC(hdc);
    IntPtr hBitmap = IntPtr.Zero;
    IntPtr hOldPal = IntPtr.Zero;
    Image img = null;

    try
    {
        // 获取图片的宽度和高度
        int width = picture.Width;
        int height = picture.Height;

        // 创建兼容的位图
        hBitmap = CreateCompatibleBitmap(hdc, width, height);

        // 选择新的位图
        hOldPal = SelectPalette(hdcMem, hPal, 0);
        RealizePalette(hdcMem);
        SelectObject(hdcMem, hBitmap);

        // 绘制图片
        picture.Render(hdcMem, 0, 0, width, height, 0, height, width, -height, IntPtr.Zero);

        // 将位图转换为 System.Drawing.Image
        Bitmap bmp = Image.FromHbitmap(hBitmap);
        img = (Image)bmp.Clone();
    }
    finally
    {
        // 释放资源
        if (hOldPal != IntPtr.Zero)
            SelectPalette(hdcMem, hOldPal, 0);

        if (hBitmap != IntPtr.Zero)
            DeleteObject(hBitmap);

        if (hdcMem != IntPtr.Zero)
            DeleteDC(hdcMem);

        if (hdc != IntPtr.Zero)
            ReleaseDC(IntPtr.Zero, hdc);
    }

    return img;
}