Print Manager Print Job File Limit and WM_SPOOLERSTATUS

• Microsoft Windows Software Development Kit (SDK) for Windows versions 3.0 and 3.1

SUMMARY

In the Microsoft Windows versions 3.0 and earlier Print Manager, the print queue is limited to a total of 20 jobs. After 20 files have been sent to the queue, another file cannot be printed from an application until one of the spooled files has finished being sent to the printer.

The print queue limit for Print Manager under the Windows Operating System version 3.1 is 100 print jobs.

An application can process the WM_SPOOLERSTATUS message to determine when a job is added to or removed from the Print Manager queue. This message also provides the number of jobs remaining in the queue. Please see the documentation for WM_SPOOLERSTATUS for more information.

The following code fragment demonstrates use of the WM_SPOOLERSTATUS message:

   case WM_SPOOLERSTATUS:
      if (wParam == SP_JOBSTATUS)
         {
         itoa ( LOWORD(lParam), buff, 5);
         MessageBox( hWnd, (LPSTR)buff,
             (LPSTR)"Number of Jobs Remaining", MB_OK);
         }
      else
         {
         itoa ( wParam, buff, 5);
         MessageBox( hWnd, (LPSTR)buff,
             (LPSTR)"Unknown Spooler Message", MB_OK);
         }
      break;