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MainWndProc
As its name implies, the MainWndProc function handles messages sent to the program's parent (main) window. These
messages signal that the user has made a menu selection, resized the window, or
changed the pen system through Control Panel. These actions generate,
respectively, the following messages:
- WM_COMMAND message. If the user selects a command from the Options menu, the
program notes the selection in the global flag viMenuSel. The state of this flag determines whether subsequent input goes to the
system recognizer or the sample recognizer SREC, or is collected into an HPENDATA object for conversion to a mirror image.
- WM_SIZE message. PENAPP resizes its windows according to the information in
the lParam variable.
- WM_PENMISCINFO message. The procedure allows this message to fall through to DefWindowProc for default handling.
LRESULT CALLBACK MainWndProc(
HWND hwnd, // Window handle
UINT message, // Message
WPARAM wParam, // Varies
LPARAM lParam ) // Varies
{
LONG lRet = 0L;
.
.
.
switch (message)
{
case WM_COMMAND:
switch (wParam)
{
case miExit:
DestroyWindow( vhwndMain );
break;
case miSample:
case miSystem:
case miMirror:
ResetWindow( wParam );
break;
}
break;
.
.
.
case WM_DESTROY:
if (vhpendata)
{
// PKPD.DLL API: function pointer not needed:
DestroyPenData( vhpendata );
}
//
// Unload sample recognizer. (Don't
// unload system default recognizer.)
//
UninstallRecognizer( vhrec );
PostQuitMessage( 0 );
break;
default:
lRet = DefWindowProc( hwnd, message, wParam, lParam );
break;
}
return lRet;
}
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