Setting Default Printer

Does anyone know how to set the default printer in a windows nt4.0 environment in C++/VC++.
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TAMCAsked:
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jkrConnect With a Mentor Commented:
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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chensuCommented:
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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TAMCAuthor Commented:
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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jkrCommented:
>>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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chensuCommented:
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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TAMCAuthor Commented:
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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jkrCommented:
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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TAMCAuthor Commented:
Thanks, jkr, worked out wonderfully.
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SreejithCommented:
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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