Message not picked up: ComboBox

I can't see why control never gets to the lines indicated:

Code:

---

LRESULT CALLBACK CannedFixDlgBox(HWND hDlg, UINT message, WORD wParam, DWORD lParam)
{
        static HWND cfe_fix;
        int    li_result, i;
        DWORD  dw_index;
        CANFIXNODE *fixnode;

        switch (message)
        {
                /* Use messages to update, etc */
                case WM_INITDIALOG:
                        CentraliseWindow(hDlg);
                        cfe_fix = GetDlgItem(hDlg, CFE_FIX);                        ...
                        ... code to set up the list, which I know works OK
                        ...
                        break;
                case WM_COMMAND:
                {
                        switch (LOWORD(wParam))
                        {
                                case CFE_FIX:
                                {
                                        switch (HIWORD(wParam))
                                        {
                                                // Never seems to get here - why?
                                                case CBN_SELENDOK:
                                                case CBN_SELCHANGE:
                                                case CBN_CLOSEUP:
                                                case CBN_SELENDCANCEL:
                                                ...
                                                break;
                                        }
                                        return 0;
                                        break;
                                }
                                case ...:
                                ...
                                ...
                                default:
                                        break;
                        }
                        return TRUE;
                }
                default:
                        break;
        }
        return FALSE;
}

---

The dropdown populates perfectly OK, and I can get it to dropdown and make a selection.

I'm under the impression from the documentation that the message CBN_SELENDOK will be picked up when a selection is made, but HIWORD(wParam) is consistetly coming through with zero, thus those CBN_ messages are never processed.

Any ideas as to why? I've searched and found a number of examples, all of which appear to do much the same as me, but there has to be something wrong somewhere.....

Any ideas? TIA.

Well your code to check for the messages appears correct. I think the problem is in your procedure declaration.

Code:

---

LRESULT CALLBACK CannedFixDlgBox(HWND hDlg, UINT message, WORD wParam, DWORD lParam)

---

Here you have wParam declared as a WORD instead of a DWORD. The wParam parameter should be an unsigned int (Im not sure how it even compiled for you). Change the code to the following:

Code:

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LRESULT CALLBACK CannedFixDlgBox(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)

---

Hey bithub, you're a star!!

I was concentrating too closely on the actual code, not the declaration line. Changing it as you suggested has resolved the fault.

Goes to show that a fresh pair of eyes on something often works wonders.

Thanks!

good to hear :)