将C++代码转换为C＃

Question

在转换下面的代码C＃时，我遇到了非常棘手的挑战，任何人都可以帮助我解决这个问题。

typedef struct ACSNameAddr_t { 
    char FAR *serverName; // How do i use FAR in C# 
    struct { 
     short length; 
     unsigned char FAR *value; 
    } serverAddr; 
} ACSNameAddr_t; 

以及如何使用这个工会在C＃

typedef struct 
{ 
    union 
    { 
     CSTARouteRegisterAbortEvent_t registerAbort; 
     CSTARouteUsedEvent_t   routeUsed; 
     CSTARouteUsedExtEvent_t   routeUsedExt; 
     CSTARouteEndEvent_t    routeEnd; 
     CSTAPrivateEvent_t    privateEvent; 
     CSTASysStatEvent_t    sysStat; 
     CSTASysStatEndedEvent_t   sysStatEnded; 
    }u; 
} CSTAEventReport; 

编辑答案：

所以包括所有的答案，这里由我写信转换后的代码。通过使用StructLayout如有什么不妥编辑它，它可能是有用的人..

[StructLayout(LayoutKind.Sequential, Pack = 4)] 
public struct ACSNameAddr_t 
{ 
    string serverName; 
    [StructLayout(LayoutKind.Sequential, Pack = 4)] 
    public struct serverAddr 
    { 
     public short length; 
     string value; 
    }; 
}; 

和第二个，

[StructLayout(LayoutKind.Explicit, Pack = 4)] 
    public struct CSTAEventReport{ 
     [StructLayout(LayoutKind.Explicit, Pack = 4)] 
     public struct u{ 
      [FieldOffset(0)] 
      public CSTARouteRegisterAbortEvent_t registerAbort; 
      [FieldOffset(0)] 
      public CSTARouteUsedEvent_t routeUsed; 
      [FieldOffset(0)] 
      public CSTARouteUsedExtEvent_t routeUsedExt; 
      [FieldOffset(0)] 
      public CSTARouteEndEvent_t routeEnd; 
      [FieldOffset(0)] 
      public CSTAPrivateEvent_t privateEvent; 
      [FieldOffset(0)] 
      public CSTASysStatEvent_t sysStat; 
      [FieldOffset(0)] 
      public CSTASysStatEndedEvent_t sysStatEnded; 
     }; 
}; 

Answer 1

所以包括你所有的答案，在这里我正在写转换的代码。如果有什么问题，请编辑它，它可能是有用的人..

[StructLayout(LayoutKind.Sequential, Pack = 4)] 
public struct ACSNameAddr_t 
{ 
    string serverName; 
    [StructLayout(LayoutKind.Sequential, Pack = 4)] 
    public struct serverAddr 
    { 
     public short length; 
     string value; 
    }; 
}; 

和第二个，

[StructLayout(LayoutKind.Explicit, Pack = 4)] 
    public struct CSTAEventReport{ 
     [StructLayout(LayoutKind.Explicit, Pack = 4)] 
     public struct u{ 
      [FieldOffset(0)] 
      public CSTARouteRegisterAbortEvent_t registerAbort; 
      [FieldOffset(0)] 
      public CSTARouteUsedEvent_t routeUsed; 
      [FieldOffset(0)] 
      public CSTARouteUsedExtEvent_t routeUsedExt; 
      [FieldOffset(0)] 
      public CSTARouteEndEvent_t routeEnd; 
      [FieldOffset(0)] 
      public CSTAPrivateEvent_t privateEvent; 
      [FieldOffset(0)] 
      public CSTASysStatEvent_t sysStat; 
      [FieldOffset(0)] 
      public CSTASysStatEndedEvent_t sysStatEnded; 
     }; 
}; 

Answer 2

您可以模拟C++在C＃中的工会：

http://msdn.microsoft.com/en-us/library/acxa5b99(v=vs.80).aspx

基本上，只需声明一系列具有相同偏移量的变量，这实际上就是一个联合。

编辑：刚才拷贝/从链接粘贴来说明：

[System.Runtime.InteropServices.StructLayout(LayoutKind.Explicit)] 
struct TestUnion 
{ 
    [System.Runtime.InteropServices.FieldOffset(0)] 
    public int i; 

    [System.Runtime.InteropServices.FieldOffset(0)] 
    public double d; 

    [System.Runtime.InteropServices.FieldOffset(0)] 
    public char c; 

    [System.Runtime.InteropServices.FieldOffset(0)] 
    public byte b; 
} 

Answer 3

char FAR *仅仅是一个指向字符串的指针。回到过去，我们不得不担心不同的内存型号，FAR是一个32位指针，而NEAR是一个16位指针。像处理任何其他字符指针那样对待char FAR *。