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Setting Default Printer

Posted on 1998-12-22
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Last Modified: 2010-04-02
Does anyone know how to set the default printer in a windows nt4.0 environment in C++/VC++.
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Question by:TAMC
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jkr earned 800 total points
ID: 1180847
You have to set HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Windows\device to a valid 'printer,driver,port' string.
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by:chensu
ID: 1180848
The correct way is described in the following KB article.

HOWTO: Get and Set the Default Printer in Windows
http://support.microsoft.com/support/kb/articles/Q135/3/87.asp

How to Set the Default Printer Programmatically in Windows 95
http://support.microsoft.com/support/kb/articles/q140/5/60.asp
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by:TAMC
ID: 1180849
chensu --> are you sure this will work in NT, it does say only windows 95 in "How to Set the Default Printer Programmatically in Windows 95", and I beleive the first is for OS's with an ini file, and NT 4.0, your not suppose to use that.
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by:jkr
ID: 1180850
>>it does not work on Windows NT or on a 16-bit platform

The docs are a bit ambivalent on this, but the registry key i mentioned is where NT retrieves the information about the default printer...
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by:chensu
ID: 1180851
In the article

HOWTO: Get and Set the Default Printer in Windows
http://support.microsoft.com/support/kb/articles/Q135/3/87.asp

It says "This is the preferred method of changing the printer if the code is to be platform independent; this method will work on Windows 3.1, Windows 95 and Windows NT." It also gives you Windows NT sample code.
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by:TAMC
ID: 1180852
jkr - personnally i like your answer better, no offense chensu you obviosly know what your talking about, but i don't agree with you here.  jkr if you could show me the code, i'm not much of a registry editing programmer, i will give you the points.
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by:jkr
ID: 1180853
Ok, here it is:
HRESULT ChangePrinter   (   LPCTSTR psz) // unused, string is hard-coded for demonstration purposes
{

    HRESULT     hret    =   NOERROR;

    DWORD       dwType;
    DWORD       dwSize;
    LPCTSTR     pszKey      =   _T  (   "Software\\ProXima\\InsaReport\\PrintForms");//fixme
    LPCTSTR     pszPrinter  =   _T  (   "\\\\pserv\\HP DeskJet 500C,winspool,Ne01:");

    if  (   ERROR_SUCCESS   !=  RegOpenKeyEx    (   HKEY_CURRENT_USER,
                                                    pszKey,
                                                    0,
                                                    KEY_ALL_ACCESS,
                                                    &hKey
                                                )
        )   return  (   E_FAIL);

    dwType  =   REG_SZ;
    dwSize  =   _tcslen (   pszPrinter);

    if  (   ERROR_SUCCESS   !=  (   lnErr   =   RegSetValueEx   (   hKey,
                                                                    _T  (   "Device"),
                                                                    NULL,
                                                                    dwType,
                                                                    ( BYTE*) pszPrinter,
                                                                    dwSize
                                                                )
                                )
        )   hret    =   GetLastError    ();

    RegCloseKey (   hKey);

    return  (   hret);
}
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Author Comment

by:TAMC
ID: 1180854
Thanks, jkr, worked out wonderfully.
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Expert Comment

by:Sreejith
ID: 1180855
You should set the printer name in the registory key.
First you call EnumPrinter funtion and fill an arry or combo with the printer name using the folloing code..
 
LPPRINTER_INFO_2 pPrinters;
DWORD cbPrinters;

 pPrinters=new PRINTER_INFO_2[500];
 cbPrinters = 500 * sizeof(PRINTER_INFO_2);
   EnumPrinters (dwFlags, NULL, 2, (LPBYTE) pPrinters,
                     cbPrinters, &cbPrinters, &cReturned);
  lp =pPrinters;
   char buf[50];
if (cReturned > 0)
  {
    for (int i = 0; i<cReturned; i++)
    {
       strcpy (buf, (pPrinters + i)->pPrinterName);
      m_Combo.AddString(csPrinterName);//m_Combo --combo object
 }
  }
      delete[] pPrinters;
After that select the printer from the array or combo and set the registory entry with the printer name as default .
HKEY_LOCAL_MACHINE\CONFIG\SYSTEM\CurrentControlSet\cONTROL\print\
printers\printername

Printer name from our program array..

we shold write code for setting the regitory enties..

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