Processing Joystick Messages - Win32 Multimedia Programmer's Reference

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Processing Joystick Messages

The following example illustrates how an application could respond to joystick movements and changes in the button states. When the joystick changes position, the application moves the cursor and, if either button is pressed, draws a bullet hole on the desktop. When a joystick button is pressed, the application draws a hole on the desktop and plays a sound continuously until a button is released. The messages to watch are MM_JOY1MOVE, MM_JOY1BUTTONDOWN, and MM_JOY1BUTTONUP.

case MM_JOY1MOVE : // changed position

if((UINT) wParam & (JOY_BUTTON1 | JOY_BUTTON2))

DrawFire(hWnd);

DrawSight(lParam); // calculates new cursor position

break;

case MM_JOY1BUTTONDOWN : // button is down

if((UINT) wParam & JOY_BUTTON1)

{

PlaySound(lpButton1, SND_LOOP | SND_ASYNC | SND_MEMORY);

DrawFire(hWnd);

}

else if((UINT) wParam & JOY_BUTTON2)

{

PlaySound(lpButton2, SND_ASYNC | SND_MEMORY | SND_LOOP);

DrawFire(hWnd);

}

break;

case MM_JOY1BUTTONUP : // button is up

sndPlaySound(NULL, 0); // stops the sound

break;

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