将VC ++代码转换为C＃时出错 [英] Error while converting VC++ code to C#

问题描述

OneDll.h

OneDll.h

typedef int (WINAPI *PFCALLBACK)(int Param1,char * Param2);
extern   "C"   __declspec(dllexport)   void   WINAPI   CallBack(PFCALLBACK   Func);

DemoDlg.cpp

DemoDlg.cpp

CallBack(ProcessCallBackMessage);
int WINAPI ProcessCallBackMessage(int Param1,char *Param2)
{
	if(m_DlgWnd==NULL)
        return 0;
	::PostMessage(m_DlgWnd,WM_MSG_DLG_WND,Param1,(LPARAM)Param2);
	return 0;
}	

如何在C＃中写入相同的颜色???



这就是我试过的....

how can I write Same in C#???

and this is what i've tried to do....

 public delegate void CALLBACK_PROC(int iType, char * buffer);
       CALLBACK_PROC myCallbackFunc = new CALLBACK_PROC(ProcessCallBackMessage);

public static void ProcessCallBackMessage(int iType, String buffer)
        {
            //string strIp = Marshal.PtrToStringAnsi((IntPtr)buffer, 2000);
            int h1 =(int) sIntHandle;//0;
            
            h1 = FindWindow(null, "LedSign");
            if (h1 != 0)
                SendMessage(h1, 2000, iType, (IntPtr)buffer);
        }

但这似乎不起作用....

But this doesn't seem to work....

推荐答案

你应该看看：

Marshal。 GetFunctionPointerForDelegate方法



可以这样声明你的代表：

You should get a look at:
Marshal.GetFunctionPointerForDelegate Method

May be you can declare your delegate like this:

public delegate void TheCallbackDelegate(int iType, String buffer);

并调用dll方法（用p / invoke声明）：

And call the dll method (declared with p/invoke) :

Callback(Marshal.GetFunctionPointerForDelegate(new TheCallbackDelegate(ProcessCallbackMessage)));

这不是C ++，而是WinAPI调用IN C ++。你需要弄清楚这个代码在做什么，并找到如何在C＃中做到这一点，没有直接的转换代码，因为API是不同的。即使是p / invoke也无济于事，我不这么认为。回调函数在C＃中很容易，那些是委托，但实际上没有用。

This is not C++, it's WinAPI calls IN C++. You need to work out what this code was doing and find how to do it in C#, there's no direct conversion code, because the API is different. Even p/invoke won't help here, I don't think. Callback functions are easy in C#, those are delegates, but that does not help, really.

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