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This github repo is no longer maintained although it likely will work it isn't really monitored or updated. Please use this for education purposes, in no way is the Maintainer responsible for the actions of the users.

Keyboard

Background/Foreground Key handler

Allows a developer the ability using the C# stack the ability of sending background keypresses and mouse events to any process.

This is useful for any type of automation, or testing. Although it's original roots come from being the key input handler for a botting program for the Aion online MMORPG. Since then it has been tested with many more applications and proven to be a solid library for background input events.

Demo added that shows this process working on the standard Notepad application, which only accepts Foreground input. Use notepad++ or another application to test background key presses.

PostMessage and SendMessage

How to send background keypresses.

Hello, This I feel is something that is completely misunderstood by most people so i thought i’d drop a knowledge bomb. PostMessage and SendMessage are two c/c++ functions that allow for a programmer to access Win32 API messaging. The parameters required for these messages are hWnd, wMsg, wParam, lParam.

Details:

hWnd: This is the handle to the window that you wish to send a message to in this case that will be the aion.bin mainwindowhandle. wMsg: This is the message that you plan on sending, generally to impersonate key presses you’ll need to send multiple messages, below is a simple list.

KEY_DOWN=(0x0100),KEY_UP=(0x0101),VM_CHAR=(0x0102),SYSKEYDOWN=(0x0104),SYSKEYUP=(0x0105),SYSCHAR=(0x0106),LBUTTONDOWN=(0x201),//Left mousebutton down LBUTTONUP=(0x202),//Left mousebutton up LBUTTONDBLCLK=(0x203),//Left mousebutton doubleclick RBUTTONDOWN=(0x204),//Right mousebutton down RBUTTONUP=(0x205),//Right mousebutton up RBUTTONDBLCLK=(0x206)//Right mousebutton doubleclick 

wParam: Quite simply this for key pressing is the Virtual Key Code of the key you want to press. A list can be found http://msdn.microsoft.com/en-us/library/ms645540(VS.85).aspx.

//0 keyKEY_0=0x30,//1 keyKEY_1=0x31,//2 keyKEY_2=0x32,//3 keyKEY_3=0x33,//4 keyKEY_4=0x34,//5 keyKEY_5=0x35,//6 keyKEY_6=0x36,//7 keyKEY_7=0x37,//8 keyKEY_8=0x38,//9 keyKEY_9=0x39,// - keyKEY_MINUS=0xBD,// + keyKEY_PLUS=0xBB,//A keyKEY_A=0x41,//B keyKEY_B=0x42,//C keyKEY_C=0x43,//D keyKEY_D=0x44,//E keyKEY_E=0x45,//F keyKEY_F=0x46,//G keyKEY_G=0x47,//H keyKEY_H=0x48,//I keyKEY_I=0x49,//J keyKEY_J=0x4A,//L keyKEY_L=0x4C,//K keyKEY_K=0x4B,//M keyKEY_M=0x4D,//N keyKEY_N=0x4E,//O keyKEY_O=0x4F,//P keyKEY_P=0x50,//Q keyKEY_Q=0x51,//R keyKEY_R=0x52,//S keyKEY_S=0x53,//T keyKEY_T=0x54,//U keyKEY_U=0x55,//V keyKEY_V=0x56,//W keyKEY_W=0x57,//X keyKEY_X=0x58,//Y keyKEY_Y=0x59,//Z keyKEY_Z=0x5A,//Left mouse buttonKEY_LBUTTON=0x01,//Right mouse buttonKEY_RBUTTON=0x02,//Control-break processingKEY_CANCEL=0x03,//Middle mouse button (three-button mouse)KEY_MBUTTON=0x04,//BACKSPACE key KEY_BACK=0x08,//TAB keyKEY_TAB=0x09,//CLEAR keyKEY_CLEAR=0x0C,//ENTER keyKEY_RETURN=0x0D,//SHIFT keyKEY_SHIFT=0x10,//CTRL keyKEY_CONTROL=0x11,//ALT keyKEY_MENU=0x12,//PAUSE keyKEY_PAUSE=0x13,//CAPS LOCK keyKEY_CAPITAL=0x14,//ESC keyKEY_ESCAPE=0x1B,//SPACEBARKEY_SPACE=0x20,//PAGE UP keyKEY_PRIOR=0x21,//PAGE DOWN keyKEY_NEXT=0x22,//END keyKEY_END=0x23,//HOME keyKEY_HOME=0x24,//LEFT ARROW keyKEY_LEFT=0x25,//UP ARROW keyKEY_UP=0x26,//RIGHT ARROW keyKEY_RIGHT=0x27,//DOWN ARROW keyKEY_DOWN=0x28,//SELECT keyKEY_SELECT=0x29,//PRINT keyKEY_PRINT=0x2A,//EXECUTE keyKEY_EXECUTE=0x2B,//PRINT SCREEN keyKEY_SNAPSHOT=0x2C,//INS keyKEY_INSERT=0x2D,//DEL keyKEY_DELETE=0x2E,//HELP keyKEY_HELP=0x2F,//Numeric keypad 0 keyKEY_NUMPAD0=0x60,//Numeric keypad 1 keyKEY_NUMPAD1=0x61,//Numeric keypad 2 keyKEY_NUMPAD2=0x62,//Numeric keypad 3 key KEY_NUMPAD3=0x63,//Numeric keypad 4 key KEY_NUMPAD4=0x64,//Numeric keypad 5 key KEY_NUMPAD5=0x65,//Numeric keypad 6 key KEY_NUMPAD6=0x66,//Numeric keypad 7 keyKEY_NUMPAD7=0x67,//Numeric keypad 8 key KEY_NUMPAD8=0x68,//Numeric keypad 9 key KEY_NUMPAD9=0x69,//Separator keyKEY_SEPARATOR=0x6C,//Subtract keyKEY_SUBTRACT=0x6D,//Decimal keyKEY_DECIMAL=0x6E,//Divide keyKEY_DIVIDE=0x6F,//F1 keyKEY_F1=0x70,//F2 keyKEY_F2=0x71,//F3 keyKEY_F3=0x72,//F4 keyKEY_F4=0x73,//F5 keyKEY_F5=0x74,//F6 keyKEY_F6=0x75,//F7 keyKEY_F7=0x76,//F8 keyKEY_F8=0x77,//F9 keyKEY_F9=0x78,//F10 keyKEY_F10=0x79,//F11 keyKEY_F11=0x7A,//F12 keyKEY_F12=0x7B,//SCROLL LOCK keyKEY_SCROLL=0x91,//Left SHIFT keyKEY_LSHIFT=0xA0,//Right SHIFT keyKEY_RSHIFT=0xA1,//Left CONTROL keyKEY_LCONTROL=0xA2,//Right CONTROL keyKEY_RCONTROL=0xA3,//Left MENU keyKEY_LMENU=0xA4,//Right MENU keyKEY_RMENU=0xA5,//, keyKEY_COMMA=0xBC,//. keyKEY_PERIOD=0xBE,//Play keyKEY_PLAY=0xFA,//Zoom keyKEY_ZOOM=0xFB,NULL=0x0,

lParam: This is a structure and is quite complex. Since we are simply dealing with keypresses messaging this simplifies the lParam quite a bit.

Here is the bit mapping for the 32-bit lParam:
0-15 Specifies the repeat count. The value is the number of times the keystroke is repeated as a result of the user holding down the key. The repeat count is always one for a WM_KEYUP message.
16-23 Specifies the scan code. The value depends on the original equipment manufacturer (OEM).
24 Specifies whether the key is an extended key, such as the right-hand ALT and CTRL keys that appear on an enhanced 101- or 102-key keyboard. The value is 1 if it is an extended key; otherwise, it is 0.
25-28 Reserved; do not use.
29 Specifies the context code. The value is always 0 for a WM_KEYUP message.
30 Specifies the previous key state. The value is always 1 for a WM_KEYUP message.
31 Specifies the transition state. The value is always 1 for a WM_KEYUP message. Return Value

constuintMAPVK_VK_TO_VSC=0x00;constuintMAPVK_VSC_TO_VK=0x01;constuintMAPVK_VK_TO_CHAR=0x02;constuintMAPVK_VSC_TO_VK_EX=0x03;constuintMAPVK_VK_TO_VSC_EX=0x04;uintlParam=(uint)repeatCount;uintscanCode=MapVirtualKey((uint)[Oneof the VM_KEYS],MAPVK_VK_TO_VSC_EX);lParam+=(uint)(scanCode*0x10000);lParam+=(uint)((extended)*0x1000000);lParam+=(uint)((contextCode*2)*0x10000000);lParam+=(uint)((previousState*4)*0x10000000);lParam+=(uint)((transitionState*8)*0x10000000);returnlParam;

Since you will need the Scan Code for the virtual key i recommend using http://msdn.microsoft.com/en-us/library/ms646306(VS.85).aspx function since it will make it easy. I hope this helps everyone.

Use Spy++ it comes with visual studio and enjoy.