我会带着几分历史的开始：我面对这个问题目前突然出现没有任何修改代码。 然后以同样的方式消失后3天。 现在回来了一个星期，不希望走=）。
我有一个带打印机的工作原理码 -设置它的打印机首选项来打印指定方式的文件。 我用它指向网络打印机（它是这样的任务，共同的办法，因为我知道）的TCP地址本地打印机。
在这里我如下用于加载从二进制文件打印机配置的代码 （先前保存在类似的方式）。 我给带的非托管函数调用声明的所有源代码，因为不知道会引起问题。 即制动我的应用程序（Windows服务）线路：
Marshal.StructureToPtr(pInfo, pPInfo, true); //THIS LINE FAILS
这里是一个函数的整个代码：
public static bool LoadSettings(string printerName, string filepath)
{
Logger.GetLog().WriteInformation(string.Format("Loading printer settings '{0}' for printer '{1}'", filepath, printerName), "PrinterSettingsStorage.LoadSettings()");
bool success = false;
try
{
if (!File.Exists(filepath))
{
return false;
}
IntPtr hPrinter;
int bytes = 0;
IntPtr pPInfo;
IntPtr pDevMode;
PRINTER_INFO_2 pInfo = new PRINTER_INFO_2();
PRINTER_DEFAULTS PrinterValues = new PRINTER_DEFAULTS();
PrinterValues.pDatatype = 0;
PrinterValues.pDevMode = 0;
PrinterValues.DesiredAccess = PRINTER_ALL_ACCESS;
//retrieve the devmode from file
using (FileStream fs = new FileStream(filepath, FileMode.Open))
{
int length = Convert.ToInt32(fs.Length);
pDevMode = GlobalAlloc(0, length);
for (int i = 0; i < length; i++)
{
Marshal.WriteByte(pDevMode, i, (byte)fs.ReadByte());
}
}
//get printer handle
OpenPrinter(printerName, out hPrinter, ref PrinterValues);
//get bytes for printer info structure and allocate memory
GetPrinter(hPrinter, 2, IntPtr.Zero, 0, out bytes);
if (bytes == 0)
{
throw new Exception("Get Printer Failed");
}
pPInfo = GlobalAlloc(0, bytes);
//set pointer to printer info
GetPrinter(hPrinter, 2, pPInfo, bytes, out bytes);
//place the printer info structure
pInfo = (PRINTER_INFO_2)Marshal.PtrToStructure(pPInfo, typeof(PRINTER_INFO_2));
//insert the new devmode
pInfo.pDevMode = pDevMode;
pInfo.pSecurityDescriptor = IntPtr.Zero;
//set pointer to new printer info
Marshal.StructureToPtr(pInfo, pPInfo, true); //THIS LINE FAILS
//update
SetPrinter(hPrinter, 2, pPInfo, 0);
//free resources
GlobalFree(pPInfo);
GlobalFree(pDevMode);
ClosePrinter(hPrinter);
success = true;
}
catch (COMException ce)
{
Logger.GetLog().WriteError(string.Format("COM error loading printer settings to printer: {0}", Marshal.GetLastWin32Error()), ce.StackTrace, "PrinterSettingsStorage.LoadSettings()");
}
catch (Exception e)
{
Logger.GetLog().WriteError(string.Format("Unknown error loading printer settings to printer"), e.StackTrace, "PrinterSettingsStorage.LoadSettings()");
}
finally
{
Logger.GetLog().WriteInformation(string.Format("Finish loading printer settings '{0}' for printer '{1}'. Success: {2}", printerName, filepath, success), "PrinterSettingsStorage.LoadSettings()");
}
return success;
}
[StructLayout(LayoutKind.Sequential)]
internal struct PRINTER_DEFAULTS
{
public int pDatatype;
public int pDevMode;
public int DesiredAccess;
}
[StructLayout(LayoutKind.Sequential)]
internal struct PRINTER_INFO_2
{
[MarshalAs(UnmanagedType.LPStr)]
public readonly string pServerName;
[MarshalAs(UnmanagedType.LPStr)]
public readonly string pPrinterName;
[MarshalAs(UnmanagedType.LPStr)]
public readonly string pShareName;
[MarshalAs(UnmanagedType.LPStr)]
public readonly string pPortName;
[MarshalAs(UnmanagedType.LPStr)]
public readonly string pDriverName;
[MarshalAs(UnmanagedType.LPStr)]
public readonly string pComment;
[MarshalAs(UnmanagedType.LPStr)]
public readonly string pLocation;
public IntPtr pDevMode;
[MarshalAs(UnmanagedType.LPStr)]
public readonly string pSepFile;
[MarshalAs(UnmanagedType.LPStr)]
public readonly string pPrintProcessor;
[MarshalAs(UnmanagedType.LPStr)]
public readonly string pDatatype;
[MarshalAs(UnmanagedType.LPStr)]
public readonly string pParameters;
public IntPtr pSecurityDescriptor;
public readonly Int32 Attributes;
public readonly Int32 Priority;
public readonly Int32 DefaultPriority;
public readonly Int32 StartTime;
public readonly Int32 UntilTime;
public readonly Int32 Status;
public readonly Int32 cJobs;
public readonly Int32 AveragePPM;
}
[DllImport("kernel32.dll", ExactSpelling = true)]
private static extern IntPtr GlobalFree(IntPtr handle);
[DllImport("winspool.Drv", EntryPoint = "GetPrinterA", SetLastError = true,
CharSet = CharSet.Ansi, ExactSpelling = true,
CallingConvention = CallingConvention.StdCall)]
private static extern bool GetPrinter(IntPtr hPrinter, Int32 dwLevel,
IntPtr pPrinter, Int32 dwBuf, out Int32 dwNeeded);
[DllImport("winspool.Drv", EntryPoint = "OpenPrinterA",
SetLastError = true, CharSet = CharSet.Ansi,
ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
private static extern bool
OpenPrinter([MarshalAs(UnmanagedType.LPStr)] string szPrinter,
out IntPtr hPrinter, ref PRINTER_DEFAULTS pd);
[DllImport("winspool.drv", CharSet = CharSet.Ansi, SetLastError = true)]
private static extern bool SetPrinter(IntPtr hPrinter, int Level, IntPtr pPrinter, int Command);
[DllImport("winspool.Drv", EntryPoint = "ClosePrinter", SetLastError = true,
ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
private static extern bool ClosePrinter(IntPtr hPrinter);
症状：
服务简单地停止在参考线之后立即退出。 没有finally块执行，没有例外抓获。
Windows事件日志包含错误
错误模块名称：ntdll.dll中，版本：6.1.7601.17725，时间戳：0x4ec49b8f异常代码：0xc0000374错误偏移：0x000ce6c3出错进程ID：0x12dc错误的应用程序启动时间：0x01cdc71b9bf9b661错误的应用程序路径：C：\ Program Files文件（x86）的\ MyServiceExePath.exe错误模块路径：C：\ WINDOWS \ Syswow64资料\ ntdll.dll中的报告ID：0eb45111-330f-11E2-be8e-005056975a30
我的操作系统：Windows Server 2008 R2。
正如我所说的，它不断地再现了一段时间，然后一旦走了，而不在代码中的任何改变。 我不知道是什么原因导致这个问题，为什么会这样不稳定。 希望以后还有人在这里，更expirienced与非托管代码比我=）。
有任何想法吗？
