调用GetSystemTime/SetSystemTime时发生FatalExecutionEngineError

Question

我已经在一个应用程序中编写了一个小实用程序，它将时间服务器与使用Windows API函数GetSystemTime和SetSystemTime的时间服务器进行同步。这是所有工作正常，但现在我每次打电话Get/SetSystemTime时候，我得到一个错误：

FatalExecutionEngineError was detected 
Message: 
The runtime has encountered a fatal error. 
The address of the error was at 0x792bee10, on thread 0x48c. 
The error code is 0xc0000005. This error may be a bug in the CLR 
or in the unsafe or non-verifiable portions of user code. 
Common sources of this bug include user marshaling errors for COM-interop 
or PInvoke, which may corrupt the stack. 

现在，作为唯一的不安全的代码是对Win32函数的调用（是，即使是不安全的？）好像它不能在我的代码 - 这并没有改变anythig，因为它实际上正在工作...

任何想法可能会发生什么吗？

public class SystemTime 
     { 
      public ushort Year; 
      public ushort Month; 
      public ushort DayOfWeek; 
      public ushort Day; 
      public ushort Hour; 
      public ushort Minute; 
      public ushort Second; 
      public ushort Millisecond; 

      public static implicit operator SystemTime(DateTime dt) 
      { 
       SystemTime rval = new SystemTime(); 
       rval.Year = (ushort)dt.Year; 
       rval.Month = (ushort)dt.Month; 
       rval.Day = (ushort)dt.Day; 
       rval.DayOfWeek = (ushort)dt.DayOfWeek; 
       rval.Hour = (ushort)dt.Hour; 
       rval.Minute = (ushort)dt.Minute; 
       rval.Second = (ushort)dt.Second; 
       rval.Millisecond = (ushort)dt.Millisecond; 
       return rval; 
      } 

      public static implicit operator DateTime(SystemTime st) 
      { 
       return new DateTime(st.Year, st.Month, st.Day, st.Hour, st.Minute, st.Second, st.Millisecond); 
      } 
     }; 

     [DllImport("kernel32.dll", EntryPoint = "GetSystemTime")] 
     public extern static void Win32GetSystemTime(ref SystemTime sysTime); 
     [DllImport("kernel32.dll", EntryPoint = "SetSystemTime")] 
     public extern static bool Win32SetSystemTime(ref SystemTime sysTime); 

编辑：

Win32的调用都是使用由现在非常相同的代码（未修改）是给我一个AccessViolation ???

Attempted to read or write protected memory. 
This is often an indication that other memory is corrupt. 

Answer 1

因为您将SYSTEMTIME定义为一个类，所以当您通过引用传递它时，实际上是将指针传递给指针，但在非托管端，它期望指向SYSTEMTIME结构的指针。

要么将​​您的SYSTEMTIME定义更改为一个结构体，并像现在这样通过引用来传递它。或者将它作为一个类保留，并将其声明更改为：

[DllImport("kernel32.dll")] 
static extern void GetSystemTime([Out] SYSTEMTIME systemTime); 

[DllImport("kernel32.dll")] 
public extern static uint SetSystemTime([In] SYSTEMTIME systemTime); 

个人而言，我会将其更改为结构体。

Answer 2

基于从MSDN的功能thesignatures，该PInvoke的签名，你应该使用是：

[StructLayout(LayoutKind.Sequential)] 
public class SYSTEMTIME 
{ 
    public ushort Year; 
    public ushort Month; 
    public ushort DayOfWeek; 
    public ushort Day; 
    public ushort Hour; 
    public ushort Minute; 
    public ushort Second; 
    public ushort Milliseconds; 
} 

[DllImport("kernel32.dll")] 
static extern void GetSystemTime(out SYSTEMTIME systemTime); 

[DllImport("kernel32.dll")] 
public extern static uint SetSystemTime(ref SYSTEMTIME systemTime); 

您是否使用不同的东西？