How to send a message to a C # class in an MFC DLL

How to send a message to a C # class in an MFC DLL

First, Introduction

Because Windows message is the universal Data Flow format for the Windows platform, message is a good choice when transferring data across languages, and this document describes how to send messages to the C # window class in an MFC DLL.

Second, the realization process

1. Create an MFC-based DLL project, which is used to generate DLL library functions;

2. Add a new class to the project, Cmessager;

3. Add the following code to the header file:

1 #define Zs_api extern "C" _declspec (dllexport) void23 ZS_API _sendmessagetocs (HWND hwnd, UINT MSG, WPARAM Wpara M, LPARAM LPARAM);

4. Add the following code to the CPP file:

1 ZS_API _sendmessagetocs (HWND hwnd, UINT MSG, WPARAM WPARAM, LPARAM LPARAM) 2 {3    SendMessage (hWnd, MSG, WParam, LParam); 4 }

5. Create a new C # windowsapplication test Engineering Testmfcdllmessage;

6. Add Msgtest normal class, the code in the class is as follows:

1  Public class msgtest 2 {3      Public Const int 0x400 ; 4      Public Const int 0x100 ; 5 }

7. Add the Messager class with the following code in the class:

1  Public classMessager2 {3[DllImport ("MfcDllSendMessage.dll", EntryPoint ="_sendmessagetocs", CharSet =CharSet.Auto)]4 5      Public Static extern void_sendmessagetocs (IntPtr hWnd, UInt32 Msg, UInt32 WParam, UInt32 lParam);6}

8. Add a "Call MFC DLL Send Message" button to Form1, and double-click to add the following code to the event response:

1 Private void button1_click (object  sender, EventArgs e)2{3     Messager._sendmessagetocs (this); 4 }

9. Override the default window procedure in the Form1 class with the following code:

1 protected Override voidDefwndproc (refMessage m)2 {3     Switch(m.msg)4     {5      Casemsgtest.msg_test:6         stringStrinfo =string. Format ("Hwnd:{0}\r\nmsg:{1}\r\nwparam:{2}\r\nlparam:{3}", M.hwnd.tostring (), m.msg.tostring (), m.wparam.tostring (), m.lparam.tostring ());7 MessageBox.Show (strinfo);8          Break;9 Ten     default: One         Base. Defwndproc (refm); A          Break; -     } -}

Build the entire project

Third, the realization effect

Click "Invoke MFC DLL to send Message" with the following effect:

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How to send a message to a C # class in an MFC DLL