detect focus

Code:

---

case WM_COMMAND:
                switch(wParam)
                {
                case EN_SETFOCUS:
                        MessageBox(NULL,"Edit box has focus", "Focus",MB_OK);
                }

---

I am trying to detect when my editbox has gained focus. Im not sure about the switch statement. Also what is a HIWORD and LOWORD? Thanks

What are you not sure about with the switch statements?

HIWORD is the high WORD of a double word (DWORD) type. WORD is 16 bits, and DWORD is 32-bits. If you imagine it in binary, the high word is the left 16 bits, and the low word is the right 16 bits.

Is the code working? Here is info on the EN_SETFOCUS message

Code:

---

EN_SETFOCUS
The EN_SETFOCUS notification message is sent when an edit control receives the keyboard focus. The parent window of the edit control receives this notification message through the WM_COMMAND message.

EN_SETFOCUS
idEditCtrl = (int) LOWORD(wParam); // identifier of edit control
wNotifyCode = HIWORD(wParam);      // notification code
hwndEditCtrl = (HWND) lParam;      // handle of edit control

---

no the code doesn't work. Im not sure about the first part of the switch statement

Code:

---

switch(wParam)

---

What should go where wParam is? Right now when I click in the edit box nothing happens.

I think it's meant to be HIWORD(wParam)