How to change print quality (i.e. DRAFT) ?

Hi everybody,

maybe I get help again here. Sorry, I don't have more points at the time.


Problem: Printing in print quality "DRAFT" with matrix printers does not run. The printer always works with the print quality "NEAR LETTER QUALITY".

We use a matrix printer with a EPSON-LQ-2550 emulation and the driver "Epson LQ-2550" on a Windows NT 4.0 system with service pack 3.
Notepad is able to print documents using the print quality "DRAFT" with that printer.

The sample code below shows the way, how we try to activate the draft mode. This way seems to be impossible because the flag "DM_PRINTQUALITY" of the DEVMODE structure member "dmPrintQuality" is clear. So, I have to assume, that
the printer driver does not support to change the print quality.

Is this assumption correct?

---

By the way, the SetPrinter function returns always "FALSE" and the returnvalue of GetLastError () ist 5. The printer is configured with "access to everyone". So I use the ResetDC () function to update the printer settings.  

Regards, Toni


---




/*
*/
#include <windows.h>
#include <winspool.h>
#include <wingdi.h>
#include <wtypes.h>
#include <string.h>
#include <stdio.h>

#define UNCLEN      256
int MyPrint(LPSTR);
      char        gszDevice[UNCLEN], gszDriver[UNCLEN], gszOutput[UNCLEN] ,gszDriverName[UNCLEN];

main(int argc , char ** argv)
{
/*
//code pages
      int i;
      UINT Page=atoi(argv[1]);
       if (SetConsoleOutputCP(Page))
            for (i=0;i<256;i++)
            {      printf("%3.3d=%c\r\n",i,i);
      
            }
*/

      MyPrint(argv[1]);

      return 0;
}

HDC GetPrinterDC (void)
{
      static char szPrinter [80] ;
      char        *szDevice, *szDriver, *szOutput ;

      GetProfileString ("windows", "device", ",,,", szPrinter, 80) ;

      if (NULL != (szDevice = strtok (szPrinter, "," )) &&
            NULL != (szDriver = strtok (NULL,      ", ")) &&
            NULL != (szOutput = strtok (NULL,      ", ")))
      {      strcpy(gszDevice,szDevice);
            strcpy(gszDriver,szDriver);
            strcpy(gszDriverName,szDriver);
          strcat(gszDriverName, ".DRV");
            strcpy(gszOutput,szOutput);
            return CreateDC (szDriver, szDevice, szOutput, NULL) ;
      }

      return 0 ;
}


/*****************************************************************************
 *
 *      Function:       SetDraft()
 *                      
 *                      
 *****************************************************************************
 *                      
 *      Parameter:      char *szDevice   Printer device
 *                      HDC   hPrnDC   Handle of the device context
 *                      
 *****************************************************************************
 *                      
 *      Return:         0  Printer settings available
 *                      <0   Task failed
 *                      
 ****************************************************************************/


DWORD SetDraft(char *szDevice, HDC hPrnDC)
{
  int status = 0;

  HANDLE  hPrinter;
  HGLOBAL hGlobal = NULL;
  PRINTER_INFO_2 *pi2 = NULL;

  DWORD dwNeed = 0;
  DWORD dwError = 0;
  DEVMODE *pDevModeOut = NULL,
        *pDevModeIn =NULL;

  LPBYTE p = NULL;             /* Returned area containing printer settings */


    if (!OpenPrinter (szDevice, &hPrinter, NULL))
    {
        MessageBox(NULL, "OpenPrinter failed!", NULL, MB_OK);
          status =  -1;
        return status;
    }

    GetPrinter(hPrinter, 2, 0, 0, &dwNeed);

    /* Allocate memory  */
    if ((hGlobal = GlobalAlloc(LPTR,dwNeed)) == NULL)
    {                                                   /* Not enough space */
      status =  -2;
      ClosePrinter(hPrinter);
      return(status);
    }
    if ((pi2 = (PRINTER_INFO_2 *)GlobalLock(hGlobal)) == NULL)
    {                                                   /* Not enough space */
      status =  -3;
      ClosePrinter(hPrinter);
      GlobalFree(hGlobal);
      return(status);
    }

    /* Get PRINTER_INFO_2 structure */
    if ( (! GetPrinter( hPrinter, 2, (LPBYTE)pi2, dwNeed, &dwNeed) ) )
    {
      status =  -4;
      ClosePrinter(hPrinter);
      GlobalUnlock(hGlobal);
      GlobalFree(hGlobal);
      return(status);
   }

    /* Set draft mode */
   
    if ( pi2->pDevMode != NULL )
      {
            printf("PRINTER: %s, YRes: %d, PrQ: %d, Draft: %d\n",pi2->pDevMode->dmDeviceName,
                                                        pi2->pDevMode->dmYResolution,
                                                        pi2->pDevMode->dmPrintQuality,
                                                                          (short) DMRES_DRAFT);

            if (pi2->pDevMode->dmFields & DM_PRINTQUALITY)
        {
             pi2->pDevMode->dmPrintQuality = DMRES_DRAFT;
          }
            else
            {
                  printf("Flag: DM_PRINTQUALITY not set\n");
            }
      }

    if ( DocumentProperties( NULL, hPrinter, szDevice, pi2->pDevMode,
                 pi2->pDevMode, DM_IN_BUFFER | DM_OUT_BUFFER ) != IDOK)
    {
      status =  -5;
      ClosePrinter(hPrinter);
      GlobalUnlock(hGlobal);
      GlobalFree(hGlobal);
      return(status);
    }
    /* Update printer settings */
   
//  if ( SetPrinter( hPrinter, 2, (LPBYTE)pi2, 0) == FALSE )  /* returns always "FALSE" */
      if ( ResetDC(hPrnDC,pi2->pDevMode) == FALSE )
    {
        DWORD error;

        error = GetLastError ();
        printf("GetLastError( SetPrinter ): %d\n", error);
      status =  -6;
    }

    ClosePrinter(hPrinter);
    GlobalUnlock(hGlobal);
    GlobalFree(hGlobal);
    return(status);
}                                                    

int MyPrint(LPSTR FileName)
{      BOOL EndOfFile=FALSE;
      //printing variables
      int       JobNumber;
      HDC       hPrnDC;
    DOCINFO     di;
    HFONT       hOldFont=NULL;
    HFONT      hFont=NULL;
    HFONT      hFontBig=NULL;
    HFONT      hFontBold=NULL;
    HFONT      hFontUnderline=NULL;

    int         nxLogPix, nyLogPix, dxPrinter, dyPrinter;
    int            iPageNum=0;
    DWORD       dwOldColor=0;
    DWORD       status=0;

    char    szBuffer[256];
    int     nx;
    int     ny;
      static char szPrinter [80] ;
      char        *szDevice, *szDriver, *szOutput ;


    // get a handle to the default printer
/*      if (NULL == (hPrnDC = GetPrinterDC ()))         */
/*          return FALSE ;                                 */

    GetProfileString ("windows", "device", ",,,", szPrinter, 80) ;

      if (NULL != (szDevice = strtok (szPrinter, "," )) &&
            NULL != (szDriver = strtok (NULL,      ", ")) &&
            NULL != (szOutput = strtok (NULL,      ", ")))
      {      strcpy(gszDevice,szDevice);
            strcpy(gszDriver,szDriver);
            strcpy(gszDriverName,szDriver);
          strcat(gszDriverName, ".DRV");
            strcpy(gszOutput,szOutput);
            hPrnDC = CreateDC (szDriver, szDevice, szOutput, NULL) ;
      }
      else { return FALSE; }

      if ( hPrnDC == NULL ) { return FALSE; }

//       status = SetDraft ( szDevice, hPrnDC );

    di.cbSize      = sizeof(DOCINFO);
    di.lpszDocName = (LPSTR)"TESTPRINT";
    di.lpszOutput  = NULL;

    // issue STARTDOC
      JobNumber=StartDoc(hPrnDC, &di);
    if (JobNumber < 0)
    {    // "STARTDOC escape problem"
         DeleteDC(hPrnDC);
         return FALSE;
    }

/*
{

    PRINTDLG dlg;

    ZeroMemory(&dlg, sizeof(dlg));
    dlg.lStructSize = sizeof(dlg);
    dlg.hwndOwner = NULL;


    if (PrintDlg(&dlg) == IDOK)
    {
        LPDEVMODE   pdm;
        LPDEVMODE   pdm1;
        LPDEVNAMES  pdn;
        char        szText[80];

        SetPaperName(szDevice,"A4",hPrnDC);
        pdm1 = (LPDEVMODE)GetPrinterDevmode(szDevice);
       
        pdm = GlobalLock(dlg.hDevMode);
        pdn = GlobalLock(dlg.hDevNames);

        wsprintf(szText, "dmDefaultSource = %d", pdm->dmDefaultSource);
        MessageBox(NULL, szText, pdm->dmFormName, MB_OK);

        ResetDC (hPrnDC, pdm);

        GlobalUnlock(dlg.hDevMode);
        GlobalUnlock(dlg.hDevNames);

        GlobalFree(dlg.hDevMode);
        GlobalFree(dlg.hDevNames);
    }
}
*/


              // get any information
          // get logical pixels per inch
          nxLogPix  = GetDeviceCaps(hPrnDC, LOGPIXELSX);
          nyLogPix  = GetDeviceCaps(hPrnDC, LOGPIXELSY);

          // get page resolution
          dxPrinter = GetDeviceCaps(hPrnDC, HORZRES);
          dyPrinter = GetDeviceCaps(hPrnDC, VERTRES);

      // create font
      {      
#define BASEH      100
            int  nWidth=nxLogPix / 10;      // logical average character width
            int  nHeight=nWidth * 2;      // logical height of font
            int  nEscapement=0;                  // angle of escapement
            int  nOrientation=0;            // base-line orientation angle
            int  fnWeight=FW_DONTCARE;      // font weight
            DWORD  fdwItalic=0;                  // italic attribute flag
            DWORD  fdwUnderline=0;            // underline attribute flag
            DWORD  fdwStrikeOut=0;            // strikeout attribute flag
            DWORD  fdwCharSet=ANSI_CHARSET;// character set identifier
            DWORD  fdwOutputPrecision=0;// output precision
            DWORD  fdwClipPrecision=0;      // clipping precision
            DWORD  fdwQuality=DRAFT_QUALITY;      // output quality
                        // DRAFT_QUALITY
                        // PROOF_QUALITY
            DWORD  fdwPitchAndFamily=FIXED_PITCH | FF_MODERN;      // pitch and family
 
            hFont=CreateFont(nHeight,nWidth,nEscapement,nOrientation,fnWeight,fdwItalic,fdwUnderline
                                           ,fdwStrikeOut,fdwCharSet,fdwOutputPrecision,fdwClipPrecision,fdwQuality
                                           ,fdwPitchAndFamily,"Courier 10cpi");       

        }
    hOldFont = SelectObject(hPrnDC,hFont);       
                                                                   /* Set print mode = DRAFT */
      status = SetDraft ( szDevice, hPrnDC );

                      //      SetTextAlign(hPrnDC,TA_UPDATECP);
      
    nx=nxLogPix;
    ny=nyLogPix;
      // start printing a page
    StartPage(hPrnDC);
                    

    // write something to printer
    wsprintf(szBuffer, "This is a line of text on page %d", 2);

      // normal
    SelectObject(hPrnDC,hFont);
    TextOut(hPrnDC, nx, 2*ny, szBuffer, strlen(szBuffer));
            
    // end the page; resets the dc to normal defaults
    EndPage(hPrnDC);
            

      if (EndDoc(hPrnDC) < 0)    // end the document
      {
            //"EndDoc function problem"
            return FALSE;
      }

      // CLEANUP
    // deselect font
    SelectObject(hPrnDC, hOldFont);
    DeleteDC(hPrnDC);

      return TRUE;
}