typedef struct _COMMPORTCONFIG {
DWORD BaudRate; // baud rate
DWORD ByteSize; // number of bits/byte, 4-8
DWORD Parity; // 0-4=no,odd,even,mark,space
DWORD StopBits; // 0,1,2 = 1, 1.5, 2
DWORD fOutxCtsFlow; // CTS Flow Control
} COMMPORTCONFIG;


C/C++:
BOOL MetrocomInitCommunication(int i_port, COMMPORTCONFIG * p_config);

DLL  传递结构   （见代码）
BOOL PtInRect(const RECT *lprc, POINT pt); 

using System.Runtime.InteropServices; 
[StructLayout(LayoutKind.Sequential)] 
public struct Point {
public int x; 
public int y;
} 
[StructLayout(LayoutKind.Explicit)] 
public struct Rect 
{ 
[FieldOffset(0)] public int left; 
[FieldOffset(4)] public int top;
[FieldOffset(8)] public int right; 
[FieldOffset(12)] public int bottom;
} 
Class XXXX { 
[DllImport("User32.dll")] 
public static extern bool PtInRect(ref  Rect r, Point p); 
}

------解决方案--------------------
  public struct COMMPORTCONFIG
       {
           int BaudRate; // baud rate
           int ByteSize; // number of bits/byte, 4-8
           int Parity; // 0-4=no,odd,even,mark,space
           int StopBits; // 0,1,2 = 1, 1.5, 2
           int fOutxCtsFlow; // CTS Flow Control
       }

       [DllImport("DLL文件名")]
       public static extern bool MetrocomInitCommunication(int i_port, ref COMMPORTCONFIG p_config);



------解决方案--------------------

C# code

[DllImport("你DLL名称")] 
public static extern bool  MetrocomInitCommunication(int i_port, ref COMMPORTCONFIG  p_config);

[StructLayout(LayoutKind.Sequential)] 
public struct _COMMPORTCONFIG {
int  BaudRate; // baud rate
int  ByteSize; // number of bits/byte, 4-8
int  Parity; // 0-4=no,odd,even,mark,space
int  StopBits; // 0,1,2 = 1, 1.5, 2
int  fOutxCtsFlow; // CTS Flow Control
}

int i_port;
COMMPORTCONFIG  p_config=new COMMPORTCONFIG ();
MetrocomInitCommunication(i_port, ref  p_config);

------解决方案--------------------
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C# code

[DllImport("你DLL名称")] 
public static extern bool  MetrocomInitCommunication(int i_port, ref COMMPORTCONFIG  p_config);

[StructLayout(LayoutKind.Sequential)] 
public struct _COMMPORTCONFIG {
int  BaudRate; // baud rate
int  ByteSize; // number of bits/byte, 4-8
int  Parity; // 0-4=no,odd,even,mark,space
int  StopBits; // 0,1,2 = 1, 1.5, 2
int  fOutxCtsFlow; // CTS Flow Control
}

int…