winutil.c

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/*--------------------------------------------------------------------*/
/*       w i n u t i l . h                                            */
/*                                                                    */
/*       Windows 3.1 utility functions for UUPC/extended              */
/*--------------------------------------------------------------------*/

/*--------------------------------------------------------------------*/
/*       Copyright (c) Robert Denny, 1993                             */
/*--------------------------------------------------------------------*/

/*--------------------------------------------------------------------*/
/*       Changes Copyright (c) 1989-1993 by Kendra Electronic         */
/*       Wonderworks.                                                 */
/*                                                                    */
/*       All rights reserved except those explicitly granted by       */
/*       the UUPC/extended license agreement.                         */
/*--------------------------------------------------------------------*/

/*--------------------------------------------------------------------*/
/*                          RCS Information                           */
/*--------------------------------------------------------------------*/

/*
 *    $Id: winutil.c 1.5 1993/10/02 19:07:49 ahd Exp $
 *
 *    Revision history:
 *    $Log: winutil.c $
 * Revision 1.5  1993/10/02  19:07:49  ahd
 * Print module name when winexec() fails
 *
 * Revision 1.4  1993/08/03  03:11:49  ahd
 * Further Windows 3.x fixes
 *
 * Revision 1.3  1993/08/02  03:24:59  ahd
 * Further changes in support of Robert Denny's Windows 3.x support
 *
 * Revision 1.2  1993/07/31  16:22:16  ahd
 * Changes in support of Robert Denny's Windows 3.x support
 *
 * Revision 1.1  1993/07/22  23:19:50  ahd
 * Initial revision
 *
 */

/*--------------------------------------------------------------------*/
/*                        System include files                        */
/*--------------------------------------------------------------------*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <windows.h>
#include <toolhelp.h>

/*--------------------------------------------------------------------*/
/*                    UUPC/extended include files                     */
/*--------------------------------------------------------------------*/

#include "lib.h"
#include "winutil.h"

/*--------------------------------------------------------------------*/
/*                           Local defines                            */
/*--------------------------------------------------------------------*/

/*--------------------------------------------------------------------*/
/*                          Private messages                          */
/*--------------------------------------------------------------------*/

#define PM_TASKEND WM_USER

/*--------------------------------------------------------------------*/
/*      Globals needed by callback functions & useful elsewhere       */
/*--------------------------------------------------------------------*/

HTASK hOurTask;               // Our task handle
HWND hOurWindow;              // Our EasyWin main window handle

/*--------------------------------------------------------------------*/
/*                         Used only locally                          */
/*--------------------------------------------------------------------*/

static HINSTANCE hChildInst;            // Instance of child proc
static HWND hTheWindow;                 // Used by WindCatcher() during enumeration


BOOL CALLBACK WindCatcher(HWND hWnd, LPARAM lparam);
BOOL CALLBACK NotifyCatcher(WORD wID, DWORD dwData);

static LPFNNOTIFYCALLBACK lpfnNotifyCB;
static FARPROC lpfnEnumWinCB;

void _DoneEasyWin(void);      // In TCWIN library

//------------------------------------------------------------------------
//
// CloseEasyWin() - Force EasyWin window to close on termination
//
// This function should be registered with a call to atexit() if
// you want to force the EasyWin window to close, permitting the
// application to exit, automatically. Normally, an EasyWin app
// hangs out in the "inactive" state until the user manually closes
// the window. Using an atexit() function assures that the app will
// exit automatically, regardless of the means of generating the
// exit action (such as Ctrl-SysReq signal handlers, etc.).
//
//------------------------------------------------------------------------
void CloseEasyWin(void)
{
   MSG msg;

   //
   // This will assure that the EasyWin task yields to the system
   // at least once before exiting. See the comments next to the
   // call to WinExec() below.
   //
   PeekMessage(&msg, hOurWindow, NULL, NULL, PM_NOREMOVE);
   _DoneEasyWin();
}


//------------------------------------------------------------------------
//
// SpawnWait() - Spawn a child process, wait for termination
//
// Use WinExec() to fire off a child process, then synchronize with
// its termination. For use with EasyWin applications.
//
// Inputs:
//    cmdLine     Command line including executable name
//    fuCmdShow   How to display new main window (see ShowWindow())
//
// Returns:
//    -1          Big Trouble: NotifyRegister or WinExec failed
//    >=0         Exit status of child
//
// On Error:
//    Logs and displays an error message using printmsg()
//
//------------------------------------------------------------------------

int SpawnWait( const char *command,
               const char *parameters,
               const boolean synchronous,
               const UINT fuCmdShow)
{

   BOOL bChildIsExecuting = TRUE;
   MSG msg;
   int iChildExitStatus = 0;

   if ( synchronous )
   {
      lpfnNotifyCB = (LPFNNOTIFYCALLBACK)
                           MakeProcInstance((FARPROC) NotifyCatcher,
                                             _hInstance);

      if (!NotifyRegister(hOurTask, lpfnNotifyCB, NF_NORMAL))
      {
           FreeProcInstance(lpfnNotifyCB);
           printmsg(0, "SpawnWait: NotifyRegister() failed.");
           return(-1);
      }
   }

   //
   // Start up the child proc with the given command line. To start a DOS
   // box, use a .PIF file as the executable name (1st arg).
   //
   // WARNING! The spawned task MUST give up control to the system at
   // least once before exiting! An EasyWin app that calls _DoneEasyWin()
   // in an atexit() proc may never yiend to the system. In this case
   // WinExec() will not return here before the spawned task terminates.
   // The Notification callback will be called before WinExec() returns,
   // and the hInstChild will not be set yet. Result: This task will never
   // see the termination notfication of the spawned task, and SpawnWait()
   // will wait forever. CAVEAT!
   //
   // (To insure we do yield, banner() has a call to ddelay().)

   if ( parameters == NULL )
      hChildInst = WinExec( command , fuCmdShow);
   else {
      char buf[BUFSIZ];
      strcpy( buf, command );
      strcat( buf, " " );
      strcat( buf, parameters );
      hChildInst = WinExec( buf , fuCmdShow);
   }

   if ( hChildInst < 32 )
   {

      if ( synchronous )
      {
         NotifyUnRegister(hOurTask);
         FreeProcInstance(lpfnNotifyCB);
      }

      printmsg(0, "SpawnWait: WinExec(%s %s) failed. Code = %d\n",
                  command,
                  parameters ? parameters : "",
                  (int)hChildInst);
      return(-1);

   }  /* if */

   if ( ! synchronous )
      return 0;

   //
   // LOCAL MESSAGE LOOP - Service Windows while waiting for
   // child proc to terminate.
   //
   while(bChildIsExecuting && GetMessage(&msg, NULL, NULL, NULL))
   {
      TranslateMessage(&msg);
      DispatchMessage(&msg);

      if (msg.message == PM_TASKEND)
      {
         bChildIsExecuting = FALSE;
         iChildExitStatus = (int)(LOBYTE(msg.lParam));
      } /* while */

   } /* while */

   NotifyUnRegister(hOurTask);
   FreeProcInstance(lpfnNotifyCB);

   return(iChildExitStatus);

} /* SpawnWait */

//------------------------------------------------------------------------
//
// NotifyCatcher() - Notification Callback
//
//------------------------------------------------------------------------

#ifdef __TURBOC__
#pragma argsused
#endif

BOOL CALLBACK NotifyCatcher (WORD wID, DWORD dwData)
{
   HTASK hCurTask;     // handle of the task that called the notification call back
   TASKENTRY te;


   // Check for task exiting
   switch (wID)
   {
      case NFY_EXITTASK:
         //
         // Obtain info about the task that is terminating
         //
         hCurTask = GetCurrentTask();
         te.dwSize = sizeof(TASKENTRY);
         TaskFindHandle(&te, hCurTask);
         //
         // Check if the task that is terminating is our child task.
         // Also check if the hInstance of the task that is terminating
         // in the same as the hInstance of the task that was WinExec'd
         // by us earlier in this file. This additional check is added
         // because the Task List that is brought up by selecting
         // 'Switch To ...' from the system menu is also run as a child
         // task of the application and consequently the hInstance needs
         // to be checked to determine which child task is terminating.
         // Obviously, the parent may have intentionally WinExec'ed more
         // than one child on purpose as well.
         //
         // Note that the PM_TASKEND message is sent with its LPARAM set
         // to the dwData passed to this callback. The low byte of this
         // is the child's exit status.
         //
         if (te.hTaskParent == hOurTask && te.hInst == hChildInst)
            PostMessage(hOurWindow, PM_TASKEND, (WORD)hOurTask, dwData );

         break;

         default:
            break;
   }

   // Pass notification to other callback functions
   return FALSE;

}

//------------------------------------------------------------------------
//
// FindTaskWindow() - Find handle to one of our windows, by name
//
//------------------------------------------------------------------------
HWND FindTaskWindow (HTASK hTask, LPSTR lpszClassName)
{

   hTheWindow = NULL;

   lpfnEnumWinCB = MakeProcInstance((FARPROC)WindCatcher, _hInstance);
   EnumTaskWindows(hTask, lpfnEnumWinCB, (LPARAM)lpszClassName);
   FreeProcInstance(lpfnEnumWinCB);

   return(hTheWindow);
}


//------------------------------------------------------------------------
//
// WindCatcher() - Callback function for EnumTaskWindows(). Passes
//                 back a copy of the next window handle.
//
//------------------------------------------------------------------------
#define BUF_LEN 32
BOOL CALLBACK WindCatcher (HWND hWnd, LPARAM lparam)
{
    char buf[BUF_LEN+1];
    int i;

    if ((i = GetClassName(hWnd, (LPSTR)buf, BUF_LEN)) == 0)
       return(FALSE);                      // OOPS!
    buf[i] = '\0';                          // Make cstr
    if (lstrcmpi((LPCSTR)buf, (LPCSTR)lparam) == 0) // If we found it
    {
                hTheWindow = hWnd;                  // Save it for called func
        return(FALSE);
    }
    return(TRUE);
}