PRB: MULTIPAD Sample from Win 3.1 SDK Gives Printing Error

The information in this article applies to:

• Microsoft Windows Software Development Kit (SDK) for Windows version 3.1

SYMPTOMS

The MULTIPAD sample that ships with the Microsoft Windows version 3.1 SDK allows only one print job to be sent to the printer. Any further attempts to print result in the following error:

   Cannot print <document name>!

CAUSE

The PRINTDLG data structure used for printing is a global variable, and two members of this structure are invalid after the first print job is sent. These members are not properly initialized for subsequent print jobs.

RESOLUTION

In the MPPRINT.C file, in the GetPrinterDC() routine, the following lines:

   if (pd.hDevNames)
     GlobalFree(pd.hDevNames);
   if (pd.hDevMode)
     GlobalFree(pd.hDevMode);

   if (pd.hDevNames)
   {
       GlobalFree(pd.hDevNames);
       pd.hDevNames=NULL;
   }
   if (pd.hDevMode)
   {
       GlobalFree(pd.hDevMode);
       pd.hDevMode=NULL;
   }