Printer enumeration problem

This is a discussion on Printer enumeration problem within the Windows Programming forums, part of the Platform Specific Boards category; Hello. I have a problem with printer enumeration...The following code works ok on XP, but not on Win2k. On Win2k ...

  1. #1
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    Printer enumeration problem

    Hello.
    I have a problem with printer enumeration...The following code works ok on XP, but not on Win2k.
    On Win2k network printers don't show up in the dropdown list, even though they are installed on the local machine. Printers that are physically connected to a port on the local machine, however, show up..!

    Code:
    if(EnumPrinters(PRINTER_ENUM_LOCAL|PRINTER_ENUM_CONNECTIONS, "", 5, (UCHAR*)pI1, sizeof(PRINTER_INFO_2)*MAX_PRINTERS, &lSize, &lRet)){
      for(int i=0;i<(int)lRet && i<MAX_PRINTERS;i++){
        SendMessage(GetDlgItem(hwThis, CBO_PRT), CB_ADDSTRING, 0, (long)pI1[i].pPrinterName);
        strcpy(achPorts[i], pI1[i].pPortName);
        if(!strcmp(pI1[i].pPrinterName, sil->achPrinter))
          chIx=i;
      }
    }else
      GetErr("EnumPrinters");

  2. #2
    &TH of undefined behavior Fordy's Avatar
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    http://msdn.microsoft.com/library/de...tspol_9fjn.asp

    Try add an extra flag to the first param...probably PRINTER_ENUM_NETWORK

  3. #3
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    I've tried all different flag versions.
    The function call returns successfully, but does not return printers connected through the network...

  4. #4
    &TH of undefined behavior Fordy's Avatar
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    Quote Originally Posted by knutso
    I've tried all different flag versions.
    The function call returns successfully, but does not return printers connected through the network...
    Hmm...

    Try this...I havent checked it on Win2000 but see if it works

    Code:
    #include <windows.h>
    #include <iostream>
    
    int main()
    {
    	DWORD Needed = 0,Found = 0;
    	union PRINT_INFO_ENUM
    	{
    		PRINT_INFO_ENUM():AsBytes(0){}
    		LPBYTE AsBytes;
            PRINTER_INFO_1 *AsInfo;
    	}PrinterInfo;
    
    	//Get size of array
    	EnumPrinters( PRINTER_ENUM_LOCAL | PRINTER_ENUM_CONNECTIONS ,0,1,0,1,&Needed,&Found);
    	
    	try
    	{
    		PrinterInfo.AsBytes = new BYTE[Needed];
    	}
    	catch(...)
    	{
    		std::cout << "Memory Error";
    		return -1;
    	}
    	
    	//Enum
    	if(!EnumPrinters(PRINTER_ENUM_LOCAL | PRINTER_ENUM_CONNECTIONS ,0,1,
    		PrinterInfo.AsBytes,Needed,&Needed,&Found))
    	{
    		std::cout << "Unable to enumerate " << GetLastError();
    		return -1;
    	}
    
    	for(DWORD i = 0;i < Found;++i)
    		std::cout << PrinterInfo.AsInfo[i].pName << std::endl;
    
    	delete [] PrinterInfo.AsBytes;
    }

  5. #5
    train spotter
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    I use PRINTER_ENUM_FAVORITE
    "Man alone suffers so excruciatingly in the world that he was compelled to invent laughter."
    Friedrich Nietzsche

    "I spent a lot of my money on booze, birds and fast cars......the rest I squandered."
    George Best

    "If you are going through hell....keep going."
    Winston Churchill

  6. #6
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    Now i have tried all of what you have suggested, with the same results...
    The OS is win2k server, i wonder if this is the problem..?

  7. #7
    train spotter
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    I use a print info 2 on NT based OS and print info 5 on 9X.

    EnumPrinters (PRINTER_ENUM_FAVORITE | PRINTER_ENUM_LOCAL, NULL, 2, (PBYTE) pinfo2, dwNeeded, &dwNeeded, &dwReturned) ;

    I have also found the name returned in the Devinfo can be truncated. (if you are trying to match them exactly)
    "Man alone suffers so excruciatingly in the world that he was compelled to invent laughter."
    Friedrich Nietzsche

    "I spent a lot of my money on booze, birds and fast cars......the rest I squandered."
    George Best

    "If you are going through hell....keep going."
    Winston Churchill

  8. #8
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    Still returns nothing...I'm fetching the printers directly from the registry instead.
    Thank you for your time anyway...

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