This message is sent by an application to retrieve the length, in characters, of a string in the list of a combo box.
At a Glance
| Header file: | Winuser.h |
| Windows CE versions: | 1.0 and later |
Syntax
CB_GETLBTEXTLEN wParam = (WPARAM) index; lParam = 0;
Parameters
index
Specifies the zero-based index of the string.
Return Values
The length of the string, in characters and excluding the terminating null character, indicates success. Under certain conditions, this value may actually be greater than the length of the text. For more information, see the following Remarks section.
CB_ERR indicates that the index parameter does not specify a valid index.
Remarks
Under certain conditions, the return value is larger than the actual length of the text. This occurs with certain mixtures of ANSI and Unicode, and is due to the operating system allowing for the possible existence of double-byte character set (DBCS) characters within the text. The return value, however, will always be at least as large as the actual length of the text; so you can always use it to guide buffer allocation. This behavior can occur when an application uses both ANSI functions and common dialogs, which use Unicode.
To obtain the exact length of the text, use the WM_GETTEXT, LB_GETTEXT, or CB_GETLBTEXT messages, or the GetWindowText function.
See Also