ComboBox Notification Problems

[Fromethius]

Hello everyone and thank you for taking the time to read my post,

I have this code:


case WM_COMMAND:
{
switch(LOWORD(wParam))
{
case hwndCombo:
{
switch(HIWORD(wParam))
{
case CBN_DROPDOWN:
{
MessageBox(hwnd, "OK", "OK", MB_OK);
} break;
} break;
} break;
} break;
} break;


Also, I have hwndCombo initialized right after I create my window. Don't worry, I know it is initialized before WM_COMMAND runs:

wndCombo = GetDlgItem(hwnd, 30000);

My combobox resource is defined as 30000.





Anyways, when I try to compile this code I get this error:

`hwndCombo' cannot appear in a constant-expression

Thanks for any help given.

[S_M_A]

A switch statement requires constant values for case entries. hwndCombo is a variable so you can't use it at that location. Sad but true... I'd love that it should be possible.

[Fromethius]

So how should I code notifications for a combobox in WM_COMMAND?

[S_M_A]

The easiest way out isif( LOWORD(wParam) == hwndCombo)and so on

[VladimirF]

So how should I code notifications for a combobox in WM_COMMAND?
The low-order word of wParam specifies the control identifier of the combo box, NOT the window's handle (it is in lParam). So your case should be 30000 (and NOT the hwndCombo), which luckily is a constant.

[S_M_A]

Should have checked instead of just assuming code was correct...

[VladimirF]

Should have checked instead of just assuming code was correct...
Yeah... Always check, never assume! ;)