ObjectPascal ExtractFileDrive Function Extracts the drive part of a full file name SysUtils unit

function ExtractFileDrive ( const FullFileName : string ) : string;

Description The ExtractFileDrive function extracts from FullFileName the drive substring.   If the file name does not contain a drive prefix, then an empty string is returned. Related commands ChangeFileExt Change the extension part of a file name ExtractFileDir Extracts the dir part of a full file name ExtractFileExt Extracts the extension part of a full file name ExtractFileName Extracts the name part of a full file name ExtractFilePath Extracts the path part of a full file name ProcessPath Split a drive/path/filename string into its constituent parts		Example code : Extract all of the parts of a full file name var   fullFileName : string; begin   // Set up a full file name with drive and path   fullFileName := 'C:\Program Files\Borland\Delphi7\Projects\Unit1.dcu';   // Show the component parts of this full name   WriteLn('Drive = '+ExtractFileDrive (fullFileName));   WriteLn('Dir   = '+ExtractFileDir   (fullFileName));   WriteLn('Path  = '+ExtractFilePath  (fullFileName));   WriteLn('Name  = '+ExtractFileName  (fullFileName));   WriteLn('Ext   = '+ExtractFileExt   (fullFileName)); end; Show full unit code    Drive = C:    Dir   = C:\Program Files\Borland\Delphi7\Projects    Path  = C:\Program Files\Borland\Delphi7\Projects\    Name  = Unit1.dcu    Ext   = .dcu