MFC child windows send messages to the parent window (test succeeded 20110117)

In MFC, using user-defined messages, child windows Send message procedures, code to the parent window:

1 Add the definition in resourse.h:

#define WM_ADD_EVENT_OK (wm_user + 100)//This definition method is not tested, do not know how to do;
static UINT Wm_add_event_ok = RegisterWindowMessage (_t ("User"));//tested, feasible.

2 in the parent window, in the. h file, add the definition:

Protected

afx_msg lresult Onadd_event_ok (WPARAM WPARAM, LPARAM LPARAM);

Two parameters: WPARAM WPARAM, LPARAM LPARAM type cannot be changed.

3 Add the Message Mapping section in the parent window's. cpp file:

On_message (WM_ADD_EVENT_OK, ONADD_EVENT_OK)//No test, do not know whether feasible;
On_registered_message (WM_ADD_EVENT_OK,ONADD_EVENT_OK)//test pass, feasible.

4 defines the implementation of the message handler function in the parent window's. CPP:

LRESULT class Name:: Onadd_event_ok (WPARAM WPARAM, LPARAM LPARAM)
{
int c=10;
return 0;
}

5 use code when you need to send a message:

WPARAM a=8;
LPARAM b=9;

GetParent ()->sendmessage (WM_ADD_EVENT_OK,A,B);

Or send a message using the following code:

HWND hwnd =:: GetParent (M_hwnd);

:: SendMessage (HWND,WM_ADD_EVENT_OK,A,B);

SendMessage (WM_ADD_EVENT_OK,A,B)//In the test, when the GetParent ()-> is not used, the message cannot be delivered to the message handler function of the parent window, and only after the GetParent ()-> is added, The message can be sent successfully.