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Overview |
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Group |
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Quick Info
Windows NT
| Yes
| Win95
| Yes
| Win32s
| Yes
| Import Library
| -
| Header File
| winuser.h
| Unicode
| No
| Platform Notes
| None
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CB_GETLBTEXTLEN
An application sends a CB_GETLBTEXTLEN message to retrieve the length, in
characters, of a string in the list of a combo box.
CB_GETLBTEXTLEN
wParam = (WPARAM) index; // item index
lParam = 0; // not used; must be zero
Parameters
index
Value of wParam. Specifies the zero-based index of the string.
Return Values
The return value is the length of the string, in characters, excluding the
terminating null character. Under certain conditions, this value may actually be
greater than the length of the text. For more information, see the following
Remarks section.
If the index parameter does not specify a valid index, the return value is CB_ERR.
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
CB_GETLBTEXT, GetWindowText, LB_GETTEXT, WM_GETTEXT
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