Thread: Basic GUI question (trouble getting notifications from listboxes)

I create my child windows (listbox, buttons etc.) with:

Code:

switch(message) {
	case WM_CREATE:
		ListBox = CreateWindow();
	break;
}

So how do I process their notifications? The examples I've seen do this:

Code:

case WM_COMMAND: 
	switch (LOWORD(wParam)) {
		case SOME_REAL_LOUD_CONSTANT_DEFINED_IN_THE_RC_FILE: 
                    switch (HIWORD(wParam)) {
			// All the interesting stuff
			}
		break;
	}
break;

But I don't have that constant defined in the rc file. I'm creating my windows with createwindow instead of using dialogs or something. So what do I need to do (differently)?

Code:

#include <windows.h>

#define IDI_ICON         101
#define IDC_LISTBOX_TEXT 200

const char ClassName[] = "MyWindowClass";
HWND hListBox;

LRESULT CALLBACK WndProc( HWND hWnd, UINT Msg, WPARAM wParam, LPARAM  lParam )
{
 char Buffer[256];
 int index;
    switch (Msg)
    {
        case WM_CREATE:
            {
                hListBox = CreateWindow(
                    "LISTBOX", 
                    NULL, 
                    WS_VISIBLE | WS_CHILD | LBS_STANDARD | LBS_NOTIFY, 
                    10, 
                    10, 
                    100, 
                    50, 
                    hWnd, 
                    (HMENU)IDC_LISTBOX_TEXT, 
                    (HINSTANCE)GetWindowLong(hWnd, GWL_HINSTANCE), 
                    NULL);
                SendMessage(GetDlgItem(hWnd, IDC_LISTBOX_TEXT), LB_ADDSTRING, 0, (LPARAM)"Bob");
                SendMessage(GetDlgItem(hWnd, IDC_LISTBOX_TEXT), LB_ADDSTRING, 0, (LPARAM)"Joe");
                SendMessage(GetDlgItem(hWnd, IDC_LISTBOX_TEXT), LB_ADDSTRING, 0, (LPARAM)"Theodore");
            }
            break; 
        case WM_COMMAND: 
            {
                switch(LOWORD(wParam))
                {
                    case IDC_LISTBOX_TEXT:
                        {
                            switch(HIWORD(wParam))
                            {
                                case LBN_SELCHANGE:
                                    {
                                        index = SendMessage((HWND)lParam, LB_GETCARETINDEX, 0, 0);
                                        SendMessage((HWND)lParam, LB_GETTEXT, (LPARAM)index, (WPARAM)Buffer);
                                        SetWindowText(hWnd, Buffer); 
                                    }
                            }
                        }
                        break;
                }
                return 0;
            } 
            break; 

        case WM_CLOSE:
            DestroyWindow(hWnd);
            break;
        case WM_DESTROY:
            PostQuitMessage(0);
            break;
        default:
            return (DefWindowProc(hWnd, Msg, wParam, lParam));
    }
    return 0;
}

INT WINAPI WinMain( HINSTANCE  hInstance, HINSTANCE  hPrevInstance, LPSTR lpCmdLine, INT nCmdShow )
{
  	HWND    hWnd;
	MSG    Msg;
    WNDCLASSEX    wc;

    wc.cbSize           = sizeof(WNDCLASSEX);
    wc.style            = 0;
    wc.lpfnWndProc      = (WNDPROC)WndProc;
    wc.cbClsExtra       = 0;
    wc.cbWndExtra       = 0;
    wc.hInstance        = hInstance;
    wc.hIcon            = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_ICON));
    wc.hIconSm          = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_ICON));
    wc.hCursor          = LoadCursor(NULL, IDC_ARROW);
    wc.hbrBackground    = (HBRUSH)(COLOR_WINDOW + 1);
    wc.lpszMenuName     = NULL;
    wc.lpszClassName    = ClassName;

    if (!RegisterClassEx(&wc))
    {
        MessageBox(NULL, "Failed To Register The Window Class.", "Error", MB_OK | MB_ICONERROR);
        return 0;
    }
  
    hWnd = CreateWindowEx(
        WS_EX_CLIENTEDGE,
        ClassName,
        "List Box Test",
        WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT,
        CW_USEDEFAULT,
        240,
        120,
        NULL,
        NULL,
        hInstance,
        NULL);

    if (!hWnd)
    {
        MessageBox(NULL, "Window Creation Failed.", "Error", MB_OK | MB_ICONERROR);
        return 0;
    }
    ShowWindow(hWnd, SW_SHOW);
    UpdateWindow(hWnd);
   
    while (GetMessage(&Msg, NULL, 0, 0))
    {
        TranslateMessage(&Msg);
        DispatchMessage(&Msg);
    }
    return Msg.wParam;
}

My appologies for not reading up on createwindow well enough.

Thanks for the anwser.