Category : C Source Code
Archive : DOS2WIN.ZIP
Filename : WMHANDLR.C
Output of file : WMHANDLR.C contained in archive : DOS2WIN.ZIP
WMHANDLR.C
Event (WM_ message) handlers - implementation
Dave Maxey and Andrew Schulman - 1991
originally published in Microsoft Systems Journal, July 1991
*/
#include
#include "wmhandlr.h"
long defwmhandler(HWND, unsigned, WORD, LONG);
WMHANDLER wmhandler[WM_USER];
/* ----------------------------------------------------------------------- */
/* This is our event processor. It is the dispatcher for the handlers set */
/* using SetHandler. An Application plugs this function into its */
/* window, sets handlers for messages, and WndProc handles the rest. */
/* This window procecedure should never need to be changed! */
/* ----------------------------------------------------------------------- */
long FAR PASCAL _export WndProc(HWND hWnd, WORD message,
WORD wParam, LONG lParam)
{
if (message < WM_USER)
return (*wmhandler[message])(hWnd, message, wParam, lParam);
else
return DefWindowProc(hWnd, message, wParam, lParam);
}
/* ---------------------------------------------------------------- */
/* Routines to get and set the message handlers. Setting to NULL */
/* uninstalls a handler, by setting the handler to the default */
/* which calls Windows own DefWndProc. */
/* ---------------------------------------------------------------- */
WMHANDLER wmhandler_get(unsigned message)
{
return (message < WM_USER) ? wmhandler[message] : 0;
}
WMHANDLER wmhandler_set(unsigned message, WMHANDLER f)
{
WMHANDLER oldf;
if (message < WM_USER)
{
oldf = wmhandler[message];
wmhandler[message] = f ? f : defwmhandler;
return (oldf ? oldf : defwmhandler);
}
else
return 0;
}
/* ----------------------------------------------------------------------- */
/* This is a default handler so that an application chain on to a previous */
/* handler from their current one without having to worry what was there */
/* before. All this default handler does is to call DefWindowProc. */
/* ----------------------------------------------------------------------- */
long defwmhandler(HWND hwnd, unsigned message, WORD wParam, LONG lParam)
{
return DefWindowProc(hwnd, message, wParam, lParam);
}
/* ------------------------------------------------------------------- */
/* MUST BE CALLED BEFORE THE APPLICATION WINDOW IS CREATED - */
/* Just inits the array of handlers to the default.. */
/* ------------------------------------------------------------------- */
void wmhandler_init(void)
{
WMHANDLER *pwm;
int i;
for (i=0, pwm=wmhandler; i < WM_USER; i++, pwm++)
*pwm = defwmhandler;
}
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