还是成员函数指针的问题

[doudoushen]

这次是非静态的类成员函数

#include <vector>
using namespace std;



typedef  void (CALLBACK *MSGCALLBACK)(DWORD dwMsgID, WPARAM wParam, LPARAM lParam ); 


class core 
{ 
public: 
   void RegMsgDeal(DWORD dwMsgID, MSGCALLBACK pCB)
   {
   }

   void Dispatch(DWORD dwMsg, WPARAM wParam, LPARAM lParam)
   {
   }
}; 

class A 
{ 
public: 
	void __stdcall Test( DWORD dwMsg, WPARAM wParam, LPARAM lParam ); 
}; 


#define WM_MSG	WM_USER+1000
core g_mycore; 
A	g_a;
void CZafDlg::OnButton1() 
{
	DWORD dwMsg = WM_MSG; 
	g_mycore.RegMsgDeal( dwMsg, g_a.Test ); 
	
}

//编译不过
cannot convert parameter 2 from 'void (unsigned long,unsigned int,long)' to 'void (__stdcall *)(unsigned long,unsigned int,long)'

[eatsweetpotato]

成员函数指针不能这样赋值吧

[whg01]

有__stdcall和没有__stdcall的函数是有差别的。

[doudoushen]

楼上2位 你们说的都对 我也感觉是这样，但是这样的问题怎么改呢。

[pcboyxhy]

把CALLBACK去掉么

[doudoushen]

去了也报void (unsigned long,unsigned int,long)' to 'void (__cdecl *)(unsigned long,unsigned int,long)

[pcboyxhy]

class A 
{ 
    public: 
        void Test( int dwMsg, int wParam, int lParam ){}; 
}; 
typedef  void (A::*MSGCALLBACK)(int dwMsgID, int wParam, int lParam );  


class core 
{ 
    public: 
        void RegMsgDeal(int dwMsgID, MSGCALLBACK pCB)
        {   
        }   
        void Dispatch(int dwMsg, int wParam, int lParam)
        {   
        }   
}; 

core g_mycore; 
A    g_a;
int main() 
{
    int dwMsg = 1000; 
    g_mycore.RegMsgDeal( dwMsg, &A::Test );  
}

指向成员函数的指针，声明时指定类名试试看

[doudoushen]

回pcboyxhy ，你的方法可以编译通过，现在问题是怎么Dispatch 代码稍微改了下

class A 
{ 
    public: 
        void Test( DWORD dwMsg, WPARAM wParam, LPARAM lParam ); 
}; 
typedef  void (A::*MSGCALLBACK)(DWORD dwMsgID, WPARAM wParam, LPARAM lParam );  

typedef struct tagInfo
{
	DWORD MsgID;
	MSGCALLBACK pCB;
}tInfo;

class core 
{ 
    public: 
        void RegMsgDeal(DWORD dwMsgID, MSGCALLBACK pCB); 
        void Dispatch(DWORD dwMsg, WPARAM wParam, LPARAM lParam);

		vector<tInfo>m_vct;
}; 


void core::RegMsgDeal(DWORD dwMsgID, MSGCALLBACK pCB) 
{
	tInfo tTmp;
	tTmp.MsgID = dwMsgID;
	tTmp.pCB = pCB;
	m_vct.push_back(tTmp);
}

void core::Dispatch(DWORD dwMsg, WPARAM wParam, LPARAM lParam)
{
	((tInfo)m_vct[0]).pCB( dwMsg, wParam, lParam );//这里出错
}

void  A::Test( DWORD dwMsg, WPARAM wParam, LPARAM lParam )
{
	TRACE("dwMsg = %d, wParam = %d, lParam = %d\n", dwMsg, wParam, lParam);
}

[yunccll]

void core::Dispatch(DWORD dwMsg, WPARAM wParam, LPARAM lParam)
{
((tInfo)m_vct[0]).pCB( dwMsg, wParam, lParam );//这里出错
}

m_vct[0].pCB 是一个 member function pointer； 例如: A::Test;

A::Test调用的方式是：A a ; a.Test(..);

m_vct[0].pCB 就相当于是 A:Test，所以调用时，也需要 A 的instance！

[pcboyxhy]

C++ Primer 第四版 18.3
TCPL 第三版 15.5

看看指向成员函数的指针应该怎么定义，怎么调用

[butwang]

对，必须要有一个类的实例来调用，c++的成员函数是__thiscall

[herman~~]

指向类的成员

应该加上A::。。。