WinCallMsgFilter

This function calls a message-filter hook.

Syntax

WinCallMsgFilter(hab, pqmsg, ulFilter);

Parameters

hab (HAB) - input

Anchor-block handle.

pqmsg (PQMSG) - input

Message to be passed to the message-filter hook.

ulFilter (ULONG) - input

Filter.

Message-filter code passed to the message-filter hook. This can be an application-specific value or one of the following standard MSGF_* values:

MSGF_DIALOGBOX

Dialog-box mode loop.

MSGF_TRACK

Window-movement and size tracking. When this hook is used the TRACKINFO structure specified the ptiTrackinfo parameter of the WinTrackRect function is updated to give the current state before the hook is called. Only the rclTrack and the fs parameters are updated.

MSGF_DRAG

Direct manipulation mode loop.

MSGF_DDEPOSTMSG

DDE post message mode loop.

Returns

rc (BOOL) - returns

Message-filter hook return indicator.

TRUE

A message-filter hook returns TRUE

FALSE

All message-filter hooks return FALSE, or no message-filter hooks are defined.

Remarks

This function allows an application to pass a message to the message-filter hook procedure(s).

Example Code

This example calls a message filter hook and passes a WM_CLOSE message in message box mode.

#define INCL_WINHOOKS           /* Window Hook Functions        */
#include <os2.h>

BOOL  fHookRet;         /* filter hook return indicator         */
HAB   hab;              /* Anchor-block handle                  */
QMSG  pqmsg;            /* Message to be passed to the
                           message-filter hook                  */
ULONG  ulFilter;        /* Filter                               */
POINTL ptrPos = {5L,5L};/* pointer position                     */

/* initialize message structure */
pqmsg.hwnd  = HWND_DESKTOP;
pqmsg.msg   = WM_CLOSE;
pqmsg.mp1   = MPVOID;
pqmsg.mp2   = MPVOID;
pqmsg.time  = 0L;
pqmsg.ptl   = ptrPos;

/* call hook in message box mode */
ulFilter = MSGF_MESSAGEBOX;

fHookRet = WinCallMsgFilter(hab, &pqmsg, ulFilter);

#define INCL_WINHOOKS /* Or use INCL_WIN, INCL_PM, */
#include <os2.h>

HAB      hab;       /*  Anchor-block handle. */
PQMSG    pqmsg;     /*  Message to be passed to the message-filter hook. */
ULONG    ulFilter;  /*  Filter. */
BOOL     rc;        /*  Message-filter hook return indicator. */

rc = WinCallMsgFilter(hab, pqmsg, ulFilter);

Related Functions

• WinCallMsgFilter
• WinReleaseHook
• WinSetHook