Example of C # image interception

In this paper, the implementation method of C # image interception is described. Share to everyone for your reference. Specific as follows:

The relevant code for image interception is as follows:

The code is as follows:

Public Form1 ()

{

InitializeComponent ();

}

private void Button1_Click (object sender, EventArgs e)

{

Image pic = new Bitmap (this. Width, this. Height);

Graphics graphic = graphics.fromimage (pic);

Graphic. CopyFromScreen (The new point. Location.x, this. LOCATION.Y), new Point (0, 0), new Size (this. Width, this. Height));

pic. Save (@ "D:/test.jpeg", imageformat.jpeg);

Graphic. Dispose ();

}

[System.Runtime.InteropServices.DllImportAttribute ("Gdi32.dll")]

private static extern bool BitBlt (

IntPtr hdcdest,//handle of target device

int nxdest,//x-coordinate of the upper-left corner of the target object

int nydest,//x-coordinate of the upper-left corner of the target object

int nwidth,//width of the rectangle of the target object

int nheight,//length of the rectangle of the target object

IntPtr hdcsrc,//Handle of source device

int NXSRC,//x-coordinate of the upper-left corner of the source object

int NYSRC,//x-coordinate of the upper-left corner of the source object

System.Int32 dwrop//Raster operation values

);

[System.Runtime.InteropServices.DllImportAttribute ("Gdi32.dll")]

private static extern IntPtr CreateDC (

String lpszdriver,//driver name

String lpszdevice,//device name

String lpszoutput,//useless, can be set to locate "NULL"

INTPTR Lpinitdata//Any printer data

);

private void Form1_sizechanged (object sender, EventArgs e)

{

}

private void Button2_Click (object sender, EventArgs e)

{

This. Hide ();

IntPtr DC1 = CreateDC ("DISPLAY", NULL,

NULL, (INTPTR) null);

//Create a DC for the monitor

Graphics g1 = GRAPHICS.FROMHDC (DC1);

//Creates a new graphics object by a handle to a specified device

Bitmap myimage =

New Bitmap (Screen.PrimaryScreen.Bounds.Width,

Screen.PrimaryScreen.Bounds.Height, G1);

//Create a Bitmap object of the same size according to the screen size

Graphics g2 = Graphics.fromimage (myimage);

//Get a handle to the screen

IntPtr DC3 = G1. GetHdc ();

//Get handle to bitmap

IntPtr dc2 = G2. GetHdc ();

//Capture the current screen in the bitmap object

BitBlt (DC2, 0, 0, Screen.PrimaryScreen.Bounds.Width,

Screen.PrimaryScreen.Bounds.Height,

DC3, 0, 0, 13369376);

//Copy the current screen into the bitmap

G1. RELEASEHDC (DC3);

//Release the screen handle

G2. RELEASEHDC (DC2);

//free bitmap handle

Bitmap img = new Bitmap (myimage, 800, 600);

Zoom picture to 800*600

Img. Save ("D:\\myjpeg.jpg", imageformat.jpeg);

MessageBox.Show ("The current screen has been saved to" +

"In the C:\\myjpeg.jpg file! ”);

This. Show ();

}

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Example of C # image interception

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Example of C # image interception