将 Win Form 上的区域保存为 BMP 或 Jpeg

Question

我正在尝试在 win 窗体上绘制一个矩形，并保存选定的矩形作为磁盘上的图像（bmp 或 jpeg）。但我对保存部分感到震惊。目前我可以画矩形并将矩形作为 mRect 变量

我通过 google 搜索和各种文章进行了努力，但没有成功。我当前的表单事件代码是：

    Point selPoint;
    Rectangle mRect;

        private void Form1_MouseDown(object sender, MouseEventArgs e)
        {
            selPoint = e.Location;
        }


        private void Form1_MouseMove(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                Point p = e.Location;
                int x = Math.Min(selPoint.X, p.X);
                int y = Math.Min(selPoint.Y, p.Y);
                int w = Math.Abs(p.X - selPoint.X);
                int h = Math.Abs(p.Y - selPoint.Y);
                mRect = new Rectangle(x, y, w, h);
                this.Invalidate();
            }
        }

        private void Form1_Paint(object sender, PaintEventArgs e)
        {
            e.Graphics.DrawRectangle(Pens.Blue, mRect);
        }

        private void Form1_MouseUp(object sender, MouseEventArgs e)
        {
          // ??? 
        }

Answer 1

在您的表单中使用 RectangleToScreen() 将您的选择矩形从客户端坐标转换为屏幕坐标：

Rectangle screenRC = this.RectangleToScreen(mRect);
Bitmap bmp = new Bitmap(screenRC.Width, screenRC.Height);
using (Graphics g = Graphics.FromImage(bmp))
{
    g.CopyFromScreen(screenRC.Left, screenRC.Top, 0, 0, bmp.Size);
}
bmp.Save("a1.bmp");

将 Win Form 上的区域保存为 BMP 或 Jpeg

Save area on a Win Form as BMP or Jpeg

c#

image

winforms