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WTL Installed Printers List

, 7 Nov 2002
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Use this class in your WTL apps to retrieve a list of installed printers

Sample Image - WTLInstalledPrinters.jpg

Introduction

Want to fetch an array of installed printers for use in your WTL apps? Easy - just use this class.

First, include the header:

#include "installedprinters.h"

Next, simply create a CInstalledPrinters object and the array will be populated automatically. This class is derived from CSimpleArray<CString>, so you can, for example, fill a listbox using the following code:

CListBox listbox = GetDlgItem(IDC_LIST1);
// Get the list of installed printers
CInstalledPrinters list;
// Fill listbox
for (int i = 0; i < list.GetSize(); i++)
    listbox.AddString(list[i]);

It's as easy as that, The class will use the Win32 EnumPrinters API call, using PRINTER_INFO_5 structures - which is probably the fastest way to enumerate printers (no attempt is made to actually open the printer, as this can be slow if you have network printers installed).

CInstalledPrinters

#pragma once

#include <atlmisc.h>

class CInstalledPrinters : public CSimpleArray<CString>
{
public:
    CInstalledPrinters(void)
    {
        GetPrinters();
    }

    void GetPrinters(void)
    {        
        DWORD dwSize = 0;
        DWORD dwPrinters = 0;
        // Enumerate all installed printers
        if (!::EnumPrinters(PRINTER_ENUM_LOCAL|PRINTER_ENUM_CONNECTIONS, 
               NULL, 5, NULL, 0, &dwSize, &dwPrinters))
        {
            // Check for ERROR_INSUFFICIENT_BUFFER
            // If something else, then quit
            if (::GetLastError() != ERROR_INSUFFICIENT_BUFFER)
                return;
            // Fall through
        }
        // Allocate some buffer memory
        LPBYTE pBuffer = new BYTE [dwSize];
        if (pBuffer == NULL)
            return;
        // Fill the buffer
        // Again, this depends on the O/S
        if (!::EnumPrinters(PRINTER_ENUM_LOCAL|PRINTER_ENUM_CONNECTIONS,
              NULL, 5, pBuffer, dwSize, &dwSize, &dwPrinters))
        {
            // Error - unlikely though
            // as first call to EnumPrinters
            // succeeded!
            return;
        }
        // Do we have any printers?
        if (dwPrinters == 0)
            return;
        // Cast to PRINTER_INFO_2
        PRINTER_INFO_5* pInfo = (PRINTER_INFO_5*)pBuffer;
        // Loop adding the printers to the list
        for (DWORD i = 0; i < dwPrinters; i++, pInfo++)
            Add(CString(pInfo->pPrinterName));
        delete [] pBuffer;
    }
};

License

This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

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Comments and Discussions

 
Generalfile atlmisc.h Pinmemberpolunga25-Jan-05 20:35 
GeneralRe: file atlmisc.h PinmemberRobert Edward Caldecott25-Jan-05 22:38 
GeneralNetwork printers Pinmemberjerko22-Mar-04 3:14 
GeneralRe: Network printers Pinmemberjerko22-Mar-04 4:02 
GeneralRe: Network printers PinmemberSteve S22-Mar-04 4:03 
GeneralChoosing a printer default from the list Pinmemberjoanne_fredrickson10-Oct-03 3:18 
GeneralRe: Choosing a printer default from the list Pinmembermoronikos20-Feb-04 12:25 
GeneralRe: Choosing a printer default from the list Pinmemberchris17520-Feb-06 10:33 

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