神马文学网解读ATL/WTL/MFC消息映射的实现方式
来源：百度文库 编辑：神马文学网 时间：2024/06/13 04:39:39
如果有一个这样的类：
class test:public CMessageMap
{
//当你写下这对宏的时候，你已经提供了一个具体的ProcessWindowMessage函数
BEGIN_MSG_MAP(test)
//添加相应的消息映射
END_MSG_MAP()
}
哦，原来如此，那就让我们模拟一下这种实现方式吧!
//msg
#define OWN_MSG_1 0x1
#define OWN_MSG_2 0x2
#define OWN_MSG_3 0x3
//cmd
#define OWN_CMD_1 0x4
#define OWN_CMD_2 0x5
#define OWN_CMD_3 0x6
class COwnMessageMap//
{
public:
virtual int DefaultWinProc(unsigned int uMsg,char* wParam,char* lParam)=0;//关键的纯虚函数
void _Run()
{
int i=0;
char str[3]={0};
while(1)//模拟GetMsg
{
_sleep(1000);
sprintf(str,"%d",i);
DefaultWinProc(i,str,str);
i++;
if(i>10)
break;
}
}
};
#define BEGIN_OWN_MAP(theClass) \
int DefaultWinProc(unsigned int uMsg,char* wParam,char* lParam) \
{\
#define MSG_HANDLER(msg,function) \
if(uMsg==msg) \
{\
return function(wParam,lParam); \
}\
#define CMD_HANDLER(msg,function) \
if(uMsg==msg) \
{\
return function(uMsg,wParam,lParam); \
}\
#define END_OWN_MAP()\
return 1;\
}
class COwnWnd:public COwnMessageMap
{
BEGIN_OWN_MAP(COwnWnd)
MSG_HANDLER(OWN_MSG_1,OnMsg1)
MSG_HANDLER(OWN_MSG_3,OnMsg3)
CMD_HANDLER(OWN_CMD_1,OnCmd1)
CMD_HANDLER(OWN_CMD_2,OnCmd)
CMD_HANDLER(OWN_CMD_3,OnCmd)
END_OWN_MAP()
int OnMsg1(char* wp,char* lp)
{
printf("Msg\t");
printf(wp);
printf("\n");
return 1;
}
int OnMsg3(char* wp,char* lp)
{
printf("MSG\t");
printf(wp);
printf("\n");
return 1;
}
int OnCmd1(unsigned int id,char* wp,char* lp)
{
printf("command id:%x\t",id);
printf("CMD\t");
printf(wp);
printf("\n");
return 1;
}
int OnCmd(unsigned int id,char* wp,char* lp)
{
printf("command id:%d\t",id);
printf("CMD\t");
printf(wp);
printf("\n");
return 1;
}
};
int _tmain(int argc, _TCHAR* argv[])
{
COwnWnd Wnd;
Wnd._Run();
getchar();
return 0;
}
运行结果：
Msg 1
Msg 3
command id:4 CMD 4
command id:5 CMD 5
command id:6 CMD 6
宏特别是对C/C++程序员来说，是值得学习的啊