C # the PostThreadMessage send receive structure USES the GetMessage-CodePudding

I define a structure, the following

 public struct MsgInfo 
{

Public byte [] buffer;//u 
Public int length; 
Public MsgInfo (byte [] buffers, int lengths) 
{
Buffer=buffers; 
Length=lengths; 
} 
}

Used to specify PostThreadMessage id thread to send in the past, the following

 
[DllImport (" user32. DLL, "EntryPoint=" PostThreadMessage ")] 
Private static extern int PostThreadMessage (int threadId, uint Msg, ref MsgInfo wParam, uint IParam); 

Public void sendMessage (byte [] ReBuffer, int length) 
{
MsgInfo info=new MsgInfo (buffer, length); 
PostThreadMessage (main) ABC) GetThreadId (), 0 x4002, ref info, 0). 
}

I opened a thread to manipulate the data, data points to send, I think only to manipulate the data in this thread, GetMessage how to deal with to parse the wParam MsgInfo structure in the data? Because it is a separate class to operate, no form, not by rewriting forms DefWndProc message processing function to operate,
This is receiving thread function

 [DllImport (" kernel32. DLL)] 
Private static extern int GetCurrentThreadId (); 
[DllImport (" User32. DLL, "EntryPoint=" GetMessage)] 
Private static extern int GetMessage (ref tagMsg lpMsg, uint HWND, uint wMsgFilterMin, uint wMsgFilterMax); 
Public struct tagMsg 
{
Public int HWND; 
Public uint message; 
Public MsgInfo wParam.//public uint wParam 
Public uint lParam; 
Public uint time; 
Public Point pt; 
} 
Private void Loop_Thread () 
{
ThreadId=GetCurrentThreadId (); 
TagMsg MSG=new tagMsg (); 
While (GetMessage (ref MSG, 1, 0, 0) & gt; 0)//get messages here complains but not when PostThreadMessage bosses should show how to operate the 
{
The switch (MSG) message) 
{
Case 0 x4002: 
Byte [] ss=MSG. WParam. Buffer; 
break; 
Default: 
break; 
} 

} 

}

please bosses guidance