Question

C# 怎么根据窗体句柄，复制窗体成图片

Answer 1

[System.Runtime.InteropServices.DllImport("user32.dll")]
private static extern IntPtr GetWindowRect(IntPtr hwnd, ref Rectangle lpRect);

private void ImageFromHandle(IntPtr handle)
{
var rect = Rectangle.Empty;

// 获取指定句柄的窗口 Rectangle
var result = GetWindowRect(handle, ref rect);

if (result != IntPtr.Zero) // 如果成功获取
{
var img = new Bitmap(rect.Width, rect.Height);

using (var g = Graphics.FromImage(img))
{
g.CopyFromScreen(rect.Location,
Point.Empty, rect.Size, CopyPixelOperation.SourceCopy);

g.DrawImage(img, 0, 0, img.Width, img.Height);

// 将图片复制到剪贴板
// 可以直接粘贴到 Excel
// 使用 img.Save(fileName) 方法可以直接保存为文件
Clipboard.SetImage(img);
}
}
}