C＃的WinForms：获得具有屏幕显示图像是一个控制背后 [英] c# winforms: Getting the screenshot image that has to be behind a control

问题描述

我的C＃Windows形式，它有它几个控件，这些控件的部分都位于一个在另一个。我想，将采取输入从形式的控制和将返回具有成为控制背后的图像的功能。为前：如果表单有和backgroundImage，并包含一个按钮 - 如果我要跑这个功能我就明白了位于后面的按钮和backgroundImage的一部分。任何想法 - 和code

I have c# windows form which have several controls on it, part of the controls are located one on another. I want a function that will take for input a control from the form and will return the image that has to be behind the control. for ex: if the form has backgroundimage and contains a button on it - if I'll run this function I'll got the part of backgroundimage that located behind the button. any Idea - and code?

H-E-L-P！

推荐答案

这是我最初的猜测，但必须对其进行测试。

That's my initial guess, but have to test it.

• 把按钮无形


• 捕捉当前画面


• 捕获按钮的clientRectangle作物屏幕



• Restablish按钮。

• Put button invisible
• capture current screen
• Crop screen captured to the clientRectangle of the button

• Restablish button.

public static Image GetBackImage(Control c) {	
	c.Visible = false;
	var bmp = GetScreen();
	var img = CropImage(bmp, c.ClientRectangle);
	c.Visible = true;
}


public static Bitmap GetScreen() {
	int width = SystemInformation.PrimaryMonitorSize.Width;
	int height = SystemInformation.PrimaryMonitorSize.Height;

Rectangle screenRegion = Screen.AllScreens[0].Bounds;
var bitmap = new Bitmap(width, height, PixelFormat.Format32bppArgb);
Graphics graphics = Graphics.FromImage(bitmap);
graphics.CopyFromScreen(screenRegion.Left, screenRegion.Top, 0, 0, screenRegion.Size);
return bitmap;

}
公共静态无效CropImage（图片imagenOriginal，矩形areaCortar）{
图形G = NULL;
尝试{
//创建目标（裁剪）位图
VAR bmpCropped =新位图（areaCortar.Width，areaCortar.Height）;
//创建图形对象进行绘制
G = Graphics.FromImage（bmpCropped）;

} public static void CropImage(Image imagenOriginal, Rectangle areaCortar) { Graphics g = null; try { //create the destination (cropped) bitmap var bmpCropped = new Bitmap(areaCortar.Width, areaCortar.Height); //create the graphics object to draw with g = Graphics.FromImage(bmpCropped);

	var rectDestination = new Rectangle(0, 0, bmpCropped.Width, bmpCropped.Height);


	//draw the areaCortar of the original image to the rectDestination of bmpCropped
	g.DrawImage(imagenOriginal, rectDestination, areaCortar, GraphicsUnit.Pixel);
	//release system resources
} finally {
	if (g != null) {
		g.Dispose();
	}
}

}


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