c# - EnumPrinters function fails for Remote printers -


i trying network printer details (i have network printers on lan). working printer_enum_local. when try printer_enum_remote or printer_enum_network enumprinters() function fails (cbneeded become 0)

what possibly goes wrong.

i reffer http://www.pinvoke.net/default.aspx/winspool.enumprinters , https://msdn.microsoft.com/en-us/library/windows/desktop/dd162692(v=vs.85).aspx

public class prnspool {     [dllimport("winspool.drv", charset = charset.auto, setlasterror = true)]     private static extern bool enumprinters(printerenumflags flags, string name, uint level, intptr pprinterenum, uint cbbuf, ref uint pcbneeded, ref uint pcreturned);      private const int error_insufficient_buffer = 122;      public static printer_info_1[] enumprinters1(printerenumflags flags)     {         uint cbneeded = 0;         uint creturned = 0;         if (enumprinters(flags, null, 1, intptr.zero, 0, ref cbneeded, ref creturned))         {             return null;         }         int lastwin32error = marshal.getlastwin32error();         if (lastwin32error == error_insufficient_buffer)         {             intptr paddr = marshal.allochglobal((int)cbneeded);             if (enumprinters(flags, null, 1, paddr, cbneeded, ref cbneeded, ref creturned))             {                 printer_info_1[] printerinfo1 = new printer_info_1[creturned];                 long offset = paddr.toint64();                 type type = typeof(printer_info_1);                 int increment = marshal.sizeof(type);                 (int = 0; < creturned; i++)                 {                     printerinfo1[i] = (printer_info_1)marshal.ptrtostructure(new intptr(offset), type);                     offset += increment;                 }                 marshal.freehglobal(paddr);                 return printerinfo1;             }             lastwin32error = marshal.getlastwin32error();         }         throw new win32exception(lastwin32error);     }  }  public struct printer_info_1 {     uint flags;     string pdescription;     string pname;     string pcomment; }  [flagsattribute] public enum printerenumflags {     printer_enum_default = 0x00000001,     printer_enum_local = 0x00000002,     printer_enum_connections = 0x00000004,     printer_enum_favorite = 0x00000004,     printer_enum_name = 0x00000008,     printer_enum_remote = 0x00000010,     printer_enum_shared = 0x00000020,     printer_enum_network = 0x00000040, }

}


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