API Capture Screen

Need to invoke API functions

You need to introduce namespaces using System.Runtime.InteropServices at the beginning;

Get current Window handle: GetForegroundWindow ()

[DllImport ("user32.dll", CharSet = CharSet.Auto, ExactSpelling = true)] public static extern IntPtr GetForegroundWindow () ;

The return value type is IntPtr, which is the handle of the currently acquired focus window

Method of Use: IntPtr Myptr=getforegroundwindow ();

After you get to the window handle, you can manipulate the window. For example, close the window or hide it in the window so that it appears

[DllImport ("user32.dll", CharSet = CharSet.Auto, ExactSpelling = true)] public static extern int ShowWindow (INTPTR hwnd, I NT nCmdShow);

Wherein ShowWindow (INTPTR hwnd, int ncmdshow);

The meaning of nCmdShow

0 closing the window

1 Normal Size display window

2 Minimizing windows

3 Maximize Window

Use example: ShowWindow (myptr, 0);

To get the window size and position: Call method GetWindowRect (IntPtr hWnd, ref RECT LpRect)

[DllImport ("User32.dll")] [Return:marshalas (Unmanagedtype.bool)] static extern Bool GetWindowRect (IntPtr hWnd, ref RECT lpRect);

[StructLayout (layoutkind.sequential)] public struct RECT {public int left;//leftmost coordinate public int Top;//top coordinate public int right ; Right-most coordinate public int Bottom; Bottom-most coordinates}

Example:

Inptr Awin = GetForegroundWindow (); Gets the current window handle of the rect rect = new rect (); GetWindowRect (Awin, ref rect); int width = rc. RIGHT-RC. Left; The width of the window int height = rc. BOTTOM-RC. Top; The height of the window is int x = RC. Left; int y = rc. Top;

API Capture Screen