Windows message,

birajendu

Hi, How can i capture a Message/notification from a Child control which is again a child of another window. Window->Child->Child1. My question is how can i capture Child1's message in Window? for me Window is the parent window of the application, Child is a tab control, Child1 is aedit control.

Birajendu SonicWALL Bangalore India

Stuart Dootson

Get Child to re-send Child1 messages to window? Put in a WM_NOTIFY handler for Child1 in Child and forward all of those messages to Window. Add a WM_NOTIFY handler for Child in Window. Look at the hwndFrom member of the NMHDR part of the notification message to see which window originally sent the message.

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

birajendu

I wrote only messgae loop for parent window, can you tell me how i can incorporate message loop for child windows.

Birajendu SonicWALL Bangalore India

_Superman_

A message loop is the same irrespective of whether it is for a parent window or a child window or a window in another thread.

«_Superman_» I love work. It gives me something to do between weekends.

birajendu

Let me descrip my problem more precisely: Window->Childwindow(Tab control)->ChildWindow1(edit control). In windows message loop { case WM_NOTIFY: { switch(nmhdr->idFrom) { case IDC_MAIN_TREEVIEW: //childwindow's Id switch(nmhdr->code) { //I am expeccting notify messages from ChildWindow1? } } } } Please let me know weather i am doing correctly.?

Birajendu SonicWALL Bangalore India

Stuart Dootson

The message loop will handle all windows created on the thread it's in (a simplification, but close enough). To modify the behaviour of the child windows, you need to subclass them, to handle messages sent to them differently than the default. I would suggest you read up about window subclassing - this[^] is a good starting point. For example, to subclass a tab control created in your topmost window, you might use this to create and then subclass the control.

     RECT rcCLient;
     GetClientRect(hWnd, &rcCLient);
     hwndTab = CreateWindow(WC\_TABCONTROL, \_T("tab"), WS\_VISIBLE|WS\_CHILDWINDOW, 0, 0, rcCLient.right, rcCLient.bottom, hWnd, 0, hInst, 0);
     oldTabProc = (WNDPROC)::SetWindowLongPtr(hwndTab, GWLP\_WNDPROC, LONG\_PTR(&TabWndProc));

This next code fragment is my definition of a window procedure for the tab control that will forward notifications from an edit control contained inside it to the tab control's parent window. It's a bit evil, 'cause it uses a global for the tab control's old WNDPROC, but it illustrates the point.

WNDPROC oldTabProc;
LRESULT CALLBACK TabWndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
if (message == WM_COMMAND && HWND(lParam) == hwndEdit)
return ::SendMessage(GetParent(hWnd), message, wParam, lParam);
return oldTabProc(hWnd, message, wParam, lParam);
}

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Stuart Dootson

birajendu wrote:

In windows message loop

Do you mean in the message loop or in the WNDPROC for Window (I think it's the second one).

birajendu wrote:

//I am expeccting notify messages from ChildWindow1?

No - they get sent to the Tab control - which has a different WNDPROC. You need to subclass it so that you can process the window messages sent to it. See the message I previously posted about subclassing windows.

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

birajendu

Thanks a Lot. This served my purpose....

Birajendu SonicWALL Bangalore India