誤差在64位增加一個虛擬打印機的Windows 7

Question

我們已經寫在C＃（其中P /從WINSPOOL.DRV調用函數）的一些打印服務器軟件。一些「打印機」實際上是虛擬打印機的print to a directory。安裝這樣的打印機的代碼是：

public override void AddLocalDirectoryPrinter(string printerName, string directory) 
{ 
    IntPtr hPrinter = IntPtr.Zero; 

    try 
    { 
     PRINTER_DEFAULTS pd; 
     PRINTER_INFO_2 pi2; 

     pd.datatype = null; 
     pd.pDevMode = IntPtr.Zero; 
     // Access = PRINTER_ALL_ACCESS 
     // http://msdn.microsoft.com/en-us/library/cc244650%28v=prot.10%29.aspx 
     pd.desiredAccess = PRINTER_ALL_ACCESS; 

     // Attributes = PUBLISHED | DO_COMPLETE_FIRST | SHARED 
     // http://msdn.microsoft.com/en-us/library/aa394363%28v=vs.85%29.aspx 
     pi2.attributes = 0x2208; 
     pi2.averagePpm = 0; 
     pi2.jobs = 0; 
     pi2.defaultPriority = 0; 
     pi2.comment = "Auto-Generated by [name of program]"; 
     pi2.datatype = "RAW"; 
     pi2.pDevMode = IntPtr.Zero; 
     pi2.driverName = "Generic/Text Only"; 
     pi2.location = string.Empty; 
     pi2.parameters = string.Empty; 
     pi2.portName = directory; 
     pi2.printerName = printerName.ToUpperInvariant(); 
     pi2.printProcessor = "WinPrint"; 
     pi2.priority = 0; 
     pi2.pSecurityDescriptor = IntPtr.Zero; 
     pi2.sepFile = string.Empty; 
     pi2.serverName = string.Empty; 
     pi2.shareName = printerName.ToUpperInvariant(); 
     pi2.startTime = 0; 
     pi2.status = 0; 
     pi2.untilTime = 0; 

     hPrinter = AddPrinter(null, 2, ref pi2); 

     if (hPrinter == IntPtr.Zero) 
     { 
      throw new Win32Exception(Marshal.GetLastWin32Error()); 
     } 
    } 
    catch (Exception ex) 
    { 
     throw new PrintingException("Failed to add printer", ex); 
    } 
    finally 
    { 
     if (hPrinter != IntPtr.Zero) 
     { 
      ClosePrinter(hPrinter); 
     } 
    } 
} 

在32位Windows XP上，上述代碼運行時沒有錯誤。但在64位Windows 7，調用AddPrinter失敗，Windows錯誤1796（「指定的端口是未知」）。

爲什麼它在一個版本的Windows而不是另一個工作？

Answer 1

事實證明，我只是需要建立dirport.dll的64位版本。