misc_filespec.shtml
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<TITLE>Miscellaneous - Filename Class</TITLE>
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<!-- Article Title -->Filename Handling Class
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This article was contributed by <A HREF="mailto:UltraMaroon@email.msn.com"><!-- Author Name -->Rob Manderson</A>.
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<p>I got tired of constantly coding something like this...
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<PRE><TT><FONT COLOR="#990000">
char drive[_MAX_DRIVE],
path[_MAX_PATH],
fileName[_MAX_FNAME),
ext[_MAX_EXT);
CString newPath;
_splitpath(fullpathname, drive, path, fileName, ext):
.
.
.
newPath = drive;
newPath += path + fileName;
newPath += differentExtension;
.
.
.
// etc
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</FONT></TT></PRE>
<p>I just added zip creation and self extracting exe functionality to my app and found myself coding this stuff
yet again and thought - there has to be a better way. Then I remembered all the other places in my code that
have similar lines - license checking, history files, and decided it's time I had a filespec class.
<p>Herewith CFileSpec
<p>This class can take a full or partial path name and will split it into the appropriate parts.
You can change any part of the path and when you reference the whole object what comes back is a full filespec
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<PRE><TT><FONT COLOR="#990000">
class CFileSpec
{
public:
enum FS_BUILTINS
{
FS_EMPTY, // Nothing
FS_APP, // Full application path and name
FS_APPDIR, // Application folder
FS_WINDIR, // Windows folder
FS_SYSDIR, // System folder
FS_TMPDIR, // Temporary folder
FS_DESKTOP, // Desktop folder
FS_FAVOURITES, // Favourites folder
FS_TEMPNAME // Create a temporary name
};
CFileSpec(FS_BUILTINS spec = FS_EMPTY);
CFileSpec(LPCTSTR spec);
// Operations
BOOL Exists();
// Access functions
CString& Drive() { return m_drive; }
CString& Path() { return m_path; }
CString& FileName() { return m_fileName; }
CString& Extension() { return m_ext; }
CString FullPathNoExtension();
operator LPCTSTR() { return GetFullSpec(); } // as a C string
CString GetFullSpec();
void SetFullSpec(LPCTSTR spec);
void SetFullSpec(FS_BUILTINS spec = FS_EMPTY);
CString GetFileNameEx();
void SetFileNameEx(LPCTSTR spec);
private:
void Initialise();
void Initialise(FS_BUILTINS spec);
void UnLock();
void GetShellFolder(LPCTSTR folder);
CString m_drive,
m_path,
m_fileName,
m_ext;
};
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</FONT></TT></PRE>
<p>Each part of a full file spec is independently accessible via reference so you can code something like
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<PRE><TT><FONT COLOR="#990000">
CFileSpec fs(CFileSpec::FS_APP);
CFile file;
fs.Extension = ".lic";
file.Open(fs, CFile::modeRead | CFile::typeBinary);
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</FONT></TT></PRE>
<p>which initialises the filespec to the applications full path including drive letter and then changes the extension to
.lic As you can see the dot isn't implicit - you do need to supply it.
<p>There is an operator to return a LPCTSTR so that the CFileSpec object can be used in calls just like a CString object can.
<p>There are two constructors. One takes an existing path name and the other takes an enumerated constant. The constants
allow you to easily specify certain predefined paths. The list is documented in the class header file.
<p>Note that you need to be careful when passing a path to the object. If you want to assign a path such as c:\winnt\system32
it is necessary to append a \ otherwise the class will assume the last name in the path is actually the filename.
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<p><!-- first the filename (zip files) --><A HREF="misc_filespec.zip">Download source - 2KB</A>
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<p>Date Posted: <!-- date here -->09 May 1998
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<CENTER><FONT SIZE=-2>© 1998 Zafir Anjum</FONT> </CENTER>
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