Combo boxes need to transfer several pieces of information (strings, item data, selected item, and the index of the selected item).

The transfer buffer for combo boxes is a class called TComboBoxData. TComboBoxData has the following data members to hold the combo box information:

Data member	Type	Description
TComboBoxData::ItemDatas	TUint32Array*	Contains the item data uint32 for each item in the list box.
TComboBoxData::Selection	char*	Contains the selected string.
TComboBoxData::Strings	TStringArray*	Contains all the strings in the list box.

TComboBoxData also uses the following member functions to manipulate the combo box information:

Member function	Description
TComboBoxData::AddString	Adds a string to the Strings array, and optionally selects it.
TComboBoxData::AddStringItem	Adds a string to the Strings array, optionally selects it, and adds item data to the ItemDatas array.
TComboBoxData::Clear	Clears all data.
TComboBoxData::GetItemDatas	Returns a reference to ItemDatas.
TComboBoxData::GetSelCount	Returns the number of selected items.
TComboBoxData::GetSelection	Returns a reference to the current selection.
TComboBoxData::GetSelIndex	Returns the index of the current selection.
TComboBoxData::GetSelString	Places a copy of the current selection into a character buffer.
TComboBoxData::GetSelStringLength	Returns the length of the currently selected string.
TComboBoxData::GetStrings	Returns a reference to the entire array of strings in the combo box.
TComboBoxData::ResetSelections	Sets the current selection to a null string and sets the index to CB_ERR.
TComboBoxData::Select	Sets a string in Strings to be the current selection, based on an index parameter.
TComboBoxData::SelectString	Sets a string in Strings to be the current selection, based on matching a const char far* parameter.

See Also