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

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