Parent Window creation - c++

Question

I know it is a very simple question but i currently cant create a parent window...
My code:
LRESULT CALLBACK WndProc( HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam )
{
static HWND paste;
static HWND update_list;
/*HWND changeuser = CreateWindow(0, 0,
0,
0, 0, x, y,
0, (HMENU)changeuser2, 0, NULL); */
switch(msg)
{
case WM_CREATE:
meniu(hwnd);
CreateWindow(TEXT("static"), TEXT("\nSuckers online:"),
WS_VISIBLE | WS_CHILD | SS_CENTER,
0, 0, x, 55,
hwnd, (HMENU)delete, NULL, NULL);
connected = CreateWindow(TEXT("edit"), TEXT(""),
WS_VISIBLE | WS_CHILD | WS_VSCROLL| ES_MULTILINE ,
0, 60, x, 340,
hwnd, (HMENU)delete2, NULL, NULL);
CreateWindow(TEXT("static"), TEXT(""),
WS_VISIBLE | WS_CHILD | SS_CENTER|BS_PUSHBUTTON,
0, 405, x, 358,
hwnd, (HMENU) delete3, NULL, NULL);
paste = CreateWindow(TEXT("Edit"), TEXT("Paste the ip here"),
WS_VISIBLE | WS_CHILD | SS_CENTER,
x/2 - 60, 410, 120, 40,
hwnd, (HMENU) ip, NULL, NULL);
CreateWindow(TEXT("Button"), TEXT("Connect!"),
WS_VISIBLE | WS_CHILD | SS_CENTER | BS_PUSHBUTTON,
x/2 - 120, 450, 120, 40,
hwnd, (HMENU) connect2, NULL, NULL);
update_list = CreateWindow(TEXT("Button"), TEXT("Update the list!"),
WS_VISIBLE | WS_CHILD | SS_CENTER | BS_PUSHBUTTON,
x/2, 450, 120, 40,
hwnd, (HMENU) update, NULL, NULL);
_beginthread( lista, 0, (void*)(0) );//begin thread lista
break;
case WM_CTLCOLORSTATIC : {
HBRUSH br = CreateSolidBrush(RGB(80,67,77)); // change background color
SetTextColor((HDC)wParam,RGB(0,102,51)); //the controls text color
return (LRESULT) br;
}
case WM_COMMAND:
switch LOWORD(wParam)
{
case exit:
PostQuitMessage(0);
break;
case ip:
int nr;
nr = GetWindowTextLength(paste);
if (nr >= 17)
SetWindowText(paste, "");
break;//omor textul, ca sa pot sa fac paste
case connect2:
GetWindowText(paste,adresa,16);
_beginthread( start, 0, (void*)(0) ); //as\ici se face conexiunea principala
//DestroyWindow(hwnd);
MessageBox(0,"Connected with the user","Ok",0);
break;
case update:
exit2 = true;
Sleep(100);
SetWindowText(connected,"");
_beginthread( lista, 0, (void*)(0) );//begin thread lista
break;
}
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
}
return DefWindowProc(hwnd, msg, wParam, lParam);
}
I want the other windows created to be the child of the changeuser window...
I just cant make it happen...
Any help will be appreciated!

Answer 1

To change the window of a parent, use SetParent().
But i would think about the structure - if you need to change the parent of one or more windows in a normal dialog setting, it is likely these windows should have a different parent.
In your case there is a problem in your handling of window messages though:
If your message handler receives WM_DESTROY you call PostQuitMessage(), which probably results in your application closing.
There are two ways you can handle that:
use different window processes for your main dialog and child dialogs (preferably)
or use the hwnd parameter to decide wether you call PostQuitMessage()

Answer 2

You can't 'replace' a window. If you need to tear down and replace your main window, delete it and make a new one. Windows only get the parent flag when they have children, not because you tell them to.