HOWTO: How to Print a Single Line Without Formfeed

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Article ID: 124649 - View products that this article applies to.
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SUMMARY

This article shows by example how to have an application print one line at a time without a formfeed. Windows does not inherently provide this ability because it is in direct conflict with the design philosophy of a multitasking operating system.

One method of single-line printing, including sample code, is provided here. This method uses the combination of the raw.drv sample printer driver and the PASSTHROUGH escape, and supports printing over a network. It has the following limitations:
  • This method is not conducive to shared printing. If another application prints, it will assume that the printer is currently at the top of a page, which may not be the case if this code is being used.
  • This method is only compatible with dot matrix, daisywheel, or other printers capable of printing a single line or single line feed. It will not work with LaserJet printers that must print a page at a time.

MORE INFORMATION

If you are sure no other application will use the same printer, you can have your application print one line at a time to a dot matrix printer without issuing a formfeed. Use the raw.drv sample printer driver and the PASSTHROUGH escape to accomplish this. Follow these steps:
  1. Download raw.drv and place it in the \WINDOWS directory. For additional information about raw.drv, including instructions for download, please see the following article(s) in the Microsoft Knowledge Base:
    35708 SAMPLE: Raw.exe Sends Binary Data to Printer w/Device Driver
    Do not install this driver as the default printer driver. It is a sample driver and is not intended to be used for commercial applications.
  2. Call the PrintLineNow function by using the following code fragment:
       // The Abort Procedure for printing (a generic AbortProc)
       // This procedure needs to listed be in the Exports section
       //    of the .def file
       BOOL CALLBACK AbortProc( HDC hDC, int Error )
       {
         MSG msg;
    
        while(PeekMessage(&msg, NULL, 0, 0, TRUE))
        {
           TranslateMessage(&msg);
           DispatchMessage(&msg);
         }
         return TRUE;
       }
    
       // The function that prints one line without formfeed
       BOOL PrintLineNow( char *pData, WORD cbBytes )
       {
         #define   LINEBUFFER_LENGTH 80 //or dynamically alloc enough space
         HDC       hDC;
         char      pOutput[LINEBUFFER_LENGTH+sizeof(WORD)];
         DOCINFO   di;
         ABORTPROC lpfnAbortProc;
    
         // Buffer size is LINEBUFFER_LENGTH bytes
         if( cbBytes > LINEBUFFER_LENGTH )
            return FALSE;
    
         // Get the DC using the RAW.DRV driver
         if( (hDC = CreateDC( "RAW", NULL, "LPT1", NULL ) ) == NULL )
           return FALSE;
    
         // Set up an Abort Procedure
         if((lpfnAbortProc = MakeProcInstance(AbortProc, hInst)) == NULL)
           {
             DeleteDC( hDC );
             return FALSE;
           }
         if( SetAbortProc( hDC, lpfnAbortProc ) <= 0 )
           {
             DeleteDC( hDC );
             FreeProcInstance( lpfnAbortProc );
             return FALSE;
           }
    
         // Start a Document
         di.cbSize = sizeof( DOCINFO );
         di.lpszDocName = "MyDoc";
         di.lpszOutput = NULL;
         if( StartDoc( hDC, &di ) <= 0 )
           {
             DeleteDC( hDC );
             FreeProcInstance( lpfnAbortProc );
             return FALSE;
           }
    
         // The start of a page
         if( StartPage( hDC ) <= 0 )
           {
             DeleteDC( hDC );
             FreeProcInstance( lpfnAbortProc );
             return FALSE;
           }
    
         // Put data in the buffer and send to the printer
         *(WORD *)pOutput = cbBytes;
         memcpy( &(pOutput[sizeof(WORD)]), pData, cbBytes );
         if( Escape( hDC, PASSTHROUGH, 0, pOutput, NULL ) <= 0 )
           {
             DeleteDC( hDC );
             FreeProcInstance( lpfnAbortProc );
             return FALSE;
           }
    
         // The end of the page
         if( EndPage( hDC ) < 0 )
           {
             DeleteDC( hDC );
             FreeProcInstance( lpfnAbortProc );
             return FALSE;
           }
    
         // End the Document
         if( EndDoc( hDC ) < 0 )
           {
             DeleteDC( hDC );
             FreeProcInstance( lpfnAbortProc );
             return FALSE;
           }
    
         // Clean up
         DeleteDC( hDC );
         FreeProcInstance( lpfnAbortProc );
         return TRUE;   // Success
       }
    						

Properties

Article ID: 124649 - Last Review: September 13, 2013 - Revision: 1.1
APPLIES TO
  • Microsoft Windows Software Development Kit 3.1
Keywords: 
kbnosurvey kbarchive kb16bitonly kbhowto KB124649

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