The following example shows how to subclass an instance of an edit control in a dialog box. The subclass window procedure enables the edit control to receive all keyboard input, including the ENTER and TAB keys, whenever the control has the input focus.
WNDPROC wpOrigEditProc;
LRESULT APIENTRY EditBoxProc(
HWND hwndDlg,
UINT uMsg,
WPARAM wParam,
LPARAM lParam)
{
HWND hwndEdit;
switch(uMsg)
{
case WM_INITDIALOG:
// Retrieve the handle to the edit control.
hwndEdit = GetDlgItem(hwndDlg, ID_EDIT);
// Subclass the edit control.
wpOrigEditProc = (WNDPROC) SetWindowLong(hwndEdit,
GWL_WNDPROC, (LONG) EditSubclassProc);
//
// Continue the initialization procedure.
//
return TRUE;
case WM_DESTROY:
// Remove the subclass from the edit control.
SetWindowLong(hwndEdit, GWL_WNDPROC,
(LONG) wpOrigEditProc);
//
// Continue the cleanup procedure.
//
break;
}
return FALSE;
UNREFERENCED_PARAMETER(lParam);
}
// Subclass procedure
LRESULT APIENTRY EditSubclassProc(
HWND hwnd,
UINT uMsg,
WPARAM wParam,
LPARAM lParam)
{
if (uMsg == WM_GETDLGCODE)
return DLGC_WANTALLKEYS;
return CallWindowProc(wpOrigEditProc, hwnd, uMsg,
wParam, lParam);
}