> Help!

> The following code worked well under Delphi 1.0 but doesn't compile under 2.0

>    Procedure CreateBackup(Const Filename : String);
>    Var
>       Filename, BackupFilename, BackupExt: String;}
>    Begin
>      BackupExt := '.Bak';
>      Backupfilename := ChangeFileExt(filename, BackupExt);
>      DeleteFile(BackupFilename);
>      RenameFile(Filename, Backupfilename);
>    end;  {of CreateBackup}

> It generates compiler error 208 = Incompatible types 'string' and 'Pchar'
> on the DeleteFile line.

> The filename variable which is passed to DeleteFile() is supposed to be of
> type 'string' and I don't see where the 'Pchar' type comes into it at all??

> The old file will not be renamed to the new extension unless the previous
> backup has been deleted (it won't overwrite the old file).

> Does anyone have a way of backing up a file which works??

> --
> Email:  bre...@doolittle.vetsci.su.oz.au (Brett Jones)
> M.C. Franklin Laboratory, Department of Animal Science
> University of Sydney, Camden, N.S.W. 2570, Australia
> Ph: +61 46 550257   Fax: +61 46 556657   Mob: +61 18 119968

> The following code worked well under Delphi 1.0 but doesn't compile
under 2.0

>    Procedure CreateBackup(Const Filename : String);
>    Var
>       Filename, BackupFilename, BackupExt: String;}
>    Begin
>      BackupExt := '.Bak';
>      Backupfilename := ChangeFileExt(filename, BackupExt);
>      DeleteFile(BackupFilename);
>      RenameFile(Filename, Backupfilename);
>    end;  {of CreateBackup}

> It generates compiler error 208 = Incompatible types 'string' and
'Pchar'
> on the DeleteFile line.

> > datamar <data...@login.eunet.no> wrote in article
> <31D0F3B9.3...@login.eunet.no>...
> > Brett Jones wrote:
> > > The following code worked well under Delphi 1.0 but doesn't compile
> under 2.0
> [snip]
> > > It generates compiler error 208 = Incompatible types 'string' and
> 'Pchar'
> > > on the DeleteFile line.
> [snip]
> > If your string variables are D2's dynamically allocated String type,
> > then you can just typecast like: PChar(BackupFilename)

> Bzzt.  This problem is somewhat of an FAQ (heck, even *I* know the answer,
> and I don't develop in D2 yet)...  There is a Win32 API call named
> DeleteFile() and you are getting a name clash between the API and the
> SysUtils unit.  Simply scope your call to DeleteFile() like so:
> SysUtils.DeleteFile() and the problem should go away.