如何获取mfc的窗口消息处理函数???

Question

下面是一个edit 的子类化:
m_hEdit=CreateEdit(hwnd);
WNDPROC EdOldProc = (WNDPROC)SetWindowLong(m_hEdit, GWL_WNDPROC, (LONG)EDProc);
SetProp(m_hEdit,// handle of window
"EditOldProc",  // atom or address of string
EdOldProc);// 

Answer 1

LRESULT CALLBACK EDProc(HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam)
{// get oldproc
WNDPROC OldEdProc=(WNDPROC)GetProp(hWnd,"EditOldProc");
char buf[100]= {0};
switch(Msg)
    {
case WM_NOTIFY:
// OutputDebugString("notify\n");
break;
case WM_KEYUP:
// OutputDebugString("WM_KEYUP\n");
break;
case WM_CHAR:
if((TCHAR) wParam==VK_RETURN)
{
CallWindowProc(OldEdProc, hWnd, Msg, wParam, lParam);
POINT pt;
DWORD pos;
int idx;
// insert the indent 
GetCaretPos(&pt);
pos=SendMessage(hWnd,EM_CHARFROMPOS,0,MAKELPARAM(pt.x, pt.y));
idx=LOWORD(pos);
SendMessage(hWnd,EM_SETSEL,idx,idx);
SendMessage(hWnd,EM_REPLACESEL,0,(LPARAM)"    ");
return 0;
}
break;
#if 0
case WM_PAINT:
hdc=BeginPaint(hWnd,&ps);
// WS_BORDER 
Rectangle(hdc,ps.rcPaint.left,ps.rcPaint.top,ps.rcPaint.right,ps.rcPaint.bottom);
// ES_MULTILINE
lines=SendMessage(hWnd,EM_GETLINECOUNT,0,0);
for(jj=0;jj<lines;jj++)
{// use GetWindowText will lost CR
got=SendMessage(hWnd,EM_GETLINE,jj,(LPARAM)txt);
txt[got]=0;
if(jj==1)
{
SetTextColor(hdc,RGB(255,0,0));
TextOut(hdc,2,2 + jj*16,txt,got);
}
else
{
SetTextColor(hdc,RGB(0,0,0));
TextOut(hdc,2,2 + jj*16,txt,got);
}
}
EndPaint(hWnd,&ps);
return 0;
#endif
}
return CallWindowProc(OldEdProc, hWnd, Msg, wParam, lParam);
}