IOleControlVB interface

Visual Basic-style versions of the IOleControl methods GetControlInfo and OnMnemonic, which a class can implement.

IOleControlVB is not a Windows interface. It has the interface identifier C895C8F9-6564-4123-8760-529F72AB9322 and extends stdole.IDispatch. It is not declared [OleAutomation(False)], as the package’s Windows interfaces are. Its two methods have the dispatch identifiers 1 and 2 ([DispId(1)] and [DispId(2)]).

It exists because IOleControl has [PreserveSig] members, which a twinBASIC class cannot implement. Each method here is a Sub that corresponds to one of those two methods, with signature types that Visual Basic code uses. The other two methods of IOleControl, OnAmbientPropertyChange and FreezeEvents, have no counterpart.

Handled is the first parameter of both methods. It is passed by reference, and it is a flag that an implementation which dealt with the call sets to True.

Methods

GetControlInfo 

[DispId(1)]
Sub GetControlInfo(ByRef Handled As Boolean, ByRef AccelCount As Integer, ByRef AccelTable As LongPtr, ByRef Flags As Long)

Reports the control’s keyboard mnemonics. The three parameters after Handled are the fields of the OLECONTROLINFO structure that the Windows method fills in: AccelCount is cAccel, AccelTable is hAccel and Flags is dwFlags.

OnMnemonic 

[DispId(2)]
Sub OnMnemonic(ByRef Handled As Boolean, ByVal hWnd As LongPtr, ByVal wMsg As Long, ByVal wParam As LongPtr, ByVal lParam As LongPtr, ByVal Shift As Long)

Tells the control that the user pressed one of its mnemonic keys. The Windows method receives a pointer to the keystroke message, an OLEACCELMSG; this one receives the fields of the message as separate parameters: the window handle hWnd, the message number wMsg, and wParam and lParam. Shift is passed in addition to them.

See Also