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2007/08/27 Fast and Good Keyboard/Mouse Test without the message handler

2007/08/27 15:01

Fast and Good Keyboard/Mouse Test without the message handler

2007/08/27 15:01 in C, C++

In this short snippet, I will show you a Win32 function that checks whether a button is pressed or not. The good thing is that you don't need to handle the WM_KEYDOWN message. The second advantage is that it is really easy to use and that it can be used everywhere in the code. Here is the function-definition:

SHORT GetAsyncKeyState(
int vKey // virtual-key code
);

vKey is the virtual key code of the keyboard or mouse button you want to test. GetAsyncKeyState(..) returns true if this button is pressed and false if not. I always use GetAsyncKeyState(..) for my games and demos because it can be used simply like this without a long message handle. Here is a little example how to use it:

void CheckKeyboard()
{
   //Escape is down
   if (GetAsyncKeyState(VK_ESCAPE))
   {
PostMessage(hWnd,WM_CLOSE,0,0);
   }

   //Right mouse is down
   if (GetAsyncKeyState(VK_RBUTTON))
   {
//..
//Do something
//..
   }
}

In this function, we will check what keys are down. You could now use this function in your main loop or somewhere else in your code. Here is a list of the most important virtual key codes:

Virtual Key Code	Corresponding key on the keyboard
VK_ESCAPE	Escape
VK_SPACE	Space
VK_LEFT	Left Arrow
VK_RIGHT	Right Arrow
VK_UP	Up Arrow
VK_DOWN	Down Arrow
VK_SHIFT	Shift
VK_CONTROL	Control
VK_LBUTTON	Left Mouse Button
VK_RBUTTON	Right Mouse Button

Another posts included in "C, C++"

Using the shell to receive notification of removable media being insert... (0)	2007/08/28
UDP Send and Receive Using CAsyncSocket (0)	2007/08/28
Creating and Using a CAsyncSocket Object to use CAsyncSocket (0)	2007/08/28
Simple CGI Programming in C (0)	2007/08/27
C++ CGI Example working on Apache (0)	2007/08/27

Posted by Super Coder

GetAsyncKeyState, PostMessage, VK_DOWN, VK_ESCAPE, VK_LEFT, VK_RBUTTON, VK_RIGHT, VK_SHIFT, VK_SPACE, VK_UP

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