如何自定义一个系统没有的消息（不懂的也可以进来学习学习）

gyj_china 2003-05-08 10:36:54

我想定义一个系统没有的消息
Unit1.h
...
#define WM_MYMSG WM_USER+100;
...
public:
void __fastcast MSG(TMessage &msg);

BEGIN_MESSAGE_MAP
MESSAGE_HANDLER(WM_MYMSG, TMessage, MSG)
END_MESSAGE_MAP(TForm);
...

Unit1.cpp
...
void __fastcast TForm::Button1Click(..)
{
SendMessage(Handle,WM_MYMSG,0,0);
}
-------------------------------------
void __fastcast TForm::MSG(TMessage &msg)
{
if (msg.msg == WM_MYMSG)
ShowMessage("OK");
}
为什么会有错？？？我换成系统自已的消息就行了，但会出现一处警告。
请写个这方面程序的朋友帮个忙。我想可能是我的声明有问题？

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csd08 2003-05-08

用不着这么麻烦吧，你可以先如下定义消息：
UINT MsgData=RegisterWindowMessage("UserMsg"); //用户定义的消息
然后就可以发送了
SendMessage(Handle,WM_MsgData,0,0);
接收可以放在Form的Dispatch重载函数中
void __fastcall TForm1::Dispatch(void * Message)
{
TForm::Dispatch(Message);
PMessage pMsg=(PMessage)Message;
if(pMsg->Msg==MsgData) ShowMessage("OK"); //接收消息
}

记得在头文件中声明：
void __fastcall Dispatch(void * Message);//最好在private部分声明

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chifengwatch 2003-05-08

按楼主的意思我替你整理
//---------------------------------------------------------------------------

#include <vcl.h>
#pragma hdrstop

#include "Unit1.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
: TForm(Owner)
{
}
//---------------------------------------------------------------------------

void __fastcall TForm1::Button1Click(TObject *Sender)
{
SendMessage(Handle,WM_MYMSG,0,0);
}
//---------------------------------------------------------------------------
void __fastcall TForm1::MSG(TMessage &msg)
{
if (msg.Msg == WM_MYMSG)
ShowMessage("OK");
}

//////////////////////////////////////////////////////
#ifndef Unit1H
#define Unit1H
//---------------------------------------------------------------------------
#include <Classes.hpp>
#include <Controls.hpp>
#include <StdCtrls.hpp>
#include <Forms.hpp>

#define WM_MYMSG WM_USER+100

//---------------------------------------------------------------------------
class TForm1 : public TForm
{
__published: // IDE-managed Components
TButton *Button1;
void __fastcall Button1Click(TObject *Sender);
private: // User declarations
public: // User declarations
void __fastcall MSG(TMessage &msg);
BEGIN_MESSAGE_MAP
MESSAGE_HANDLER(WM_MYMSG, TMessage, MSG)
END_MESSAGE_MAP(TForm);
__fastcall TForm1(TComponent* Owner);
};
//---------------------------------------------------------------------------
extern PACKAGE TForm1 *Form1;
//---------------------------------------------------------------------------
#endif

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