Good at calling Windows API

Some time ago saw someone else do an automatic fill in the information and click the login program, it is very interesting.

is actually called in the program Windows API, then how to call, the following is a simple introduction.

Write simple rough, do not like light spray.

0, first introduce the namespace System.Runtime.InteropServices to import the Windows DLL.

1. The following is the function prototype:

1.1, this is the method of simulating mouse press

[DllImport ("user32.dll", EntryPoint ="mouse_event")]         Public Static extern voidMouse_event (intDwFlags,intDX,intDy,intCbuttons,intdwextrainfo);

1.2, this is the analog button press the method

[DllImport ("user32.dll", EntryPoint ="keybd_event")]         Public Static extern voidkeybd_event (byteBVK,//Virtual Key Code                byteBscan,//Hardware Scan code for this key (typically 0)DWORD DwFlags,//a set of flags for each aspect of a function operationDWORD Dwextralnfo//additional 32-bit values associated with keystrokes        );

　　　　　　

PS: There are three kinds of values for the third parameter:

• • • 0: Press;
    • 1: Extension key;
    • 2: Bounce up.

3. Related examples

  　　　   Const intMouseeventf_move =0x0001;//Move Mouse        Const intMouseeventf_leftdown =0x0002;//simulate the left mouse button press        Const intMouseeventf_leftup =0x0004;//simulate the left mouse button to lift up        Const intMouseeventf_rightdown =0x0008;//simulate the right mouse button press        Const intMouseeventf_rightup =0x0010;//Simulate right mouse button lift        Const intMouseeventf_middledown =0x0020;//simulate the middle mouse button press        Const intMouseeventf_middleup =0x0040;//Simulate mouse middle button lift        Const intMouseeventf_absolute =0x8000;//indicate if absolute coordinates are used


　　　　　　　

   PublicForm1 () {InitializeComponent (); intX = -; intY = -; Mouse_event (Mouseeventf_rightdown, X, Y,0,0); Mouse_event (Mouseeventf_rightup, X, Y,0,0); X+=Ten; Y+= $; Mouse_event (Mouseeventf_move, X, Y,0,0); Mouse_event (Mouseeventf_leftdown, X, Y,0,0); Mouse_event (Mouseeventf_leftup, X, Y,0,0); Keybd_event ( $,0,0,0);//aKeybd_event ( the,0,1,0);//bKeybd_event ( -,0,0,0);//Enter        }

4, a very practical example (implementation of the Paste copy function)

Equivalent to pressing Ctrl+ckeybd_event (Convert.ToInt32 (System.Windows.Forms.Keys.ControlKey), 0, 0, 0);  Press Ctrlkeybd_event (Convert.ToInt32 (SYSTEM.WINDOWS.FORMS.KEYS.C), 0, 0, 0); keybd_event (Convert.ToInt32 ( System.Windows.Forms.Keys.ControlKey), 0, 0x2, 0);//Bounce up ctrl,******* is important, or CTRL will always be in the press state, the keyboard is failure, my own personal experience. 

Equivalent to pressing Ctrl+vkeybd_event (Convert.ToInt32 (System.Windows.Forms.Keys.ControlKey), 0, 0, 0);  Press Ctrlkeybd_event (Convert.ToInt32 (SYSTEM.WINDOWS.FORMS.KEYS.V), 0, 0, 0); keybd_event (Convert.ToInt32 ( System.Windows.Forms.Keys.ControlKey), 0, 0x2, 0);//Bounce Ctrl

5, in fact, there are many Windows API, here only two, the following are also very common

[DllImport ("user32.dll")]Private Static extern BOOLShowWindow (IntPtr hWnd,intncmdshow); [DllImport ("user32.dll")]Private Static extern BOOLSetForegroundWindow (IntPtr hWnd); [DllImport ("user32.dll")]Private Static externIntPtr FindWindow (stringLpclassname,stringlpwindowname); [DllImport ("user32.dll")]Private Static extern intSendMessage (IntPtr hWnd,intMSG,intWParam,intLParam); [DllImport ("user32.dll")]Private Static extern BOOLSetcursorpos (intXintY);[DllImport ("user32.dll")]Private Static extern BOOLSetWindowPos (IntPtr hWnd, IntPtr Hwndlnsertafter,intXintYintCxintCyUINTFlags);

6, to add something not mentioned

Call the Windows API in C # to send a keystroke message to the specified window

Good at calling Windows API