PRB: LB_DIR with Long Filenames Returns LB_ERR in Windows 95 (131286)
The information in this article applies to:
- Microsoft Platform Software Development Kit (SDK) 1.0, when used with:
This article was previously published under Q131286 SYMPTOMS
Sending an LB_DIR message to a list box that specifies a long filename in
the lParam returns LB_ERR in Windows 95 but works fine in Windows NT
version 3.51.
CAUSE
The implementation of list boxes in Windows 95 thunks down to 16-bit
USER.EXE, and the LB_DIR command has not been enhanced to support long
filenames.
RESOLUTION
Convert the long filename to its short form before passing it as the lParam
to LB_DIR by using GetShortPathName(). Similarly, when calling DlgDirList()
to fill a list box with filenames, make sure the lpPathSpec parameter
refers to the short name of the file.
Sample Code
char szLong [256], szShort [256];
DWORD dwResult;
LONG lResult;
lstrcpy (szLong, "C:\\This Is A Test Subdirectory");
dwResult = GetShortPathName (szLong, szShort, 256);
if (!dwResult)
dwResult = GetLastError ();
lstrcat (szShort, "\\*.*");
lResult = SendDlgItemMessage (hdlg,
IDC_LIST1,
LB_DIR,
(WPARAM)(DDL_READWRITE),
(LPARAM)(LPSTR)szShort);
if (LB_ERR == lResult)
// an error occurred
NOTE: If a file with a long filename exists under the subdirectory
specified, Windows 95 displays the short name in the list box, whereas
Windows NT displays the long name.
STATUS
This behavior is by design.
MORE INFORMATION
This is not a problem under Windows NT because it always supported long
filenames.
You can have an application check the system version and decide at run time
if it should call GetShortPathName before passing the filename as lParam to
the LB_DIR message. Windows NT will, however, take a short name and fill
the list box with the filenames.
| Modification Type: | Minor | Last Reviewed: | 7/11/2005 |
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| Keywords: | kbCtrl kbListBox kbprb KB131286 |
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