// 反射消息,顾名思义就是将消息反回到消息发送源处理.
// 当父窗口收到消息后, 将 OCM__BASE+消息值 发送到来源子窗体,来源子窗体接收到消息后,如果已处理,则返回TRUE,
// 如果返回FALSE,则调用父窗体的事件处理代码.
// 一下请看相关代码
//反射消息用到的头文件
#include <OLECTL.H>
//发送反射消息宏
#define SendChildReflectMessage(hwnd,msg,wParam,lParam) SendMessage(hwnd, OCM__BASE+msg,wParam,lParam)
//通过SetWindowLong子类化的控件消息处理函数
LRESULT CALLBACK Control_WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
if (message == OCM_DRAWITEM)
{
if (OnControlDraw((LPDRAWITEMSTRUCT)lParam)) return TRUE;
}
return CallWindowProc(old_Control_WndProc,hWnd,message,wParam,lParam);
}
//主窗体消息处理函数
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message)
{
......
case WM_NOTIFY:
{
if (LPNMHDR(lParam)->code==NM_CUSTOMDRAW )
{
return SendChildReflectMessage(LPNMHDR(lParam)->hwndFrom, WM_NOTIFY,wParam,lParam);
}
}
break;
case WM_DRAWITEM:
{
LPDRAWITEMSTRUCT lpdis=(LPDRAWITEMSTRUCT)lParam;
if (SendChildReflectMessage(lpdis->hwndItem, WM_DRAWITEM,wParam,lParam)) return TRUE;
return DefWindowProc(hWnd, message, wParam, lParam);
}
break;
......
}
}