Long FileNames

[elery shaw]

When I use file open, mru, or drag and drop a longfilename onto my program the view window has the name in it's title. If I start my app by dropping a longfilename onto the app, my view is titled abcdef~1, not abcdefghi. What is going on. How do I set the correct filename.

Thanks

[Jason Teagle]

This appears to be the shell using the 8.3 filename (perhaps in case the program being started is 16-bit). In your app's InitInstance(), where the command line is parsed, you should check if a filename is specified and use FindFirstFile(), GetFullPathName() or GetLongFileName() to get the long version before passing it on.

[Josh Handley]

The last remnants of DOS 8.3 filenames that still haven't been cleaned out of windows! I haven't had this problem with the MRU or file open but drag and drop is a killer.

All you need is the function that turns a sausage into a pig!
The function that turns a DOS 8.3 filename into a long file name.
I recently saw a posting on CodeGuru of a function that does this.
Look at http://www.codeguru.com/win32/ShowPath.shtml
If that doesn't work for you I've appended my own version of such a function to the end of this message.

You then need to convert the short name to a long name before you open the file.
You can do this by overriding CWinApp::OpenDocumentFile() and converting the path passed in to a long name before passing it on to the base class e.g.


CDocument* CMyApp::OpenDocumentFile(LPCTSTR lpszFileName)
{
return CWinApp::OpenDocumentFile(shortNameToLongName( lpszFileName));
}




This catches the short name and converts before the window title gets set. Has the added advantage that if you use the standard C file functions like fopen they will work (they fail on 8.3 filenames).

Here is the code to turn a short name into a long name:



// convert short DOS 8.3 name to long name for file path
CString shortNameToLongName(CString shortName)
{
WIN32_FIND_DATA fd;
HANDLE hSearch;
DWORD size;
BOOL res;

// get current directory so we can restore later
size = GetCurrentDirectory(0, NULL);
LPTSTR currDir = new _TCHAR[size + 1];
GetCurrentDirectory(size, currDir);

if (shortName.Find(_T('\\')) < 0)
{
// not a full path - just return it
return shortName;
}


// Is it UNC style (//server/share/...) or normal (drive:/...)
if (shortName.Left(2) == _T("\\\\"))
{
// UNC so we to do CD //server/share
CString s = shortName.Right(shortName.GetLength() - 2);
int pos = s.Find(_T('\\'));
ASSERT(pos);
CString server = shortName.Left(pos + 2);
s = s.Right(s.GetLength() - pos - 1);
pos = s.Find(_T('\\'));
ASSERT(pos);
CString share = s.Left(pos);
res = SetCurrentDirectory(server + _T("\\") + share);
ASSERT(res);
shortName = s.Right(s.GetLength() - pos - 1);
} else
{
// Normal so we do CD "C:\"
int pos = shortName.Find(_T('\\'));
CString drive = shortName.Left(pos + 1);
res = SetCurrentDirectory(drive);
ASSERT(res);
shortName = shortName.Right(shortName.GetLength() - pos - 1);
}

int pos = shortName.Find(_T('\\'));
while (pos >= 0)
{
CString s = shortName.Left(pos);
hSearch = FindFirstFile( s, &fd );
ASSERT(hSearch != INVALID_HANDLE_VALUE);
FindClose(hSearch);
res = SetCurrentDirectory(fd.cFileName);
ASSERT(res);
shortName = shortName.Right(shortName.GetLength() - pos - 1);
pos = shortName.Find(_T('\\'));
}

// Whats left in shortName is filename - convert it long
hSearch = FindFirstFile( shortName, &fd );
ASSERT(hSearch != INVALID_HANDLE_VALUE);

// Now append it to current
// directory.
size = GetCurrentDirectory(0, NULL);
LPTSTR dir = new _TCHAR[size + 1];
GetCurrentDirectory(size, dir);
CString result = CString(dir) + _T("\\") + fd.cFileName;

// go back to initial directory
res = SetCurrentDirectory(currDir);
ASSERT(res);
delete currDir;
delete dir;

return result;
}