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7.2

exception on Rewrite(DataFile)

Asked by Ron_de_Weijze in Delphi Programming

Tags: delphi, assignfile, rewrite

Hi,

My application refuses to do a rewrite(datafile) in...

procedure TNotePool.Save(FileName : string);
var
DataFile : TextFile;
i : integer;
begin
AssignFile(DataFile, FileName);
Rewrite(DataFile);

...when the datafile is not new.

The datafile is created by the same application. In a previous version (working correctly), probably compiled using Delphi 4 or 5, decimal instead of hexadecimal field and line separators were used. In the new version all decimal characters have been exchanged for hexadecimal. This somehow may explain why a datafile created by the older version application/delphi has lines like these...:

0ÿNew Noteÿÿÿ-1ÿ80ÿ50ÿ65535ÿ16ÿ0ÿ1ÿ10ÿaaaþ
bbbþ
cccÿ-1

...where in the later version (I use Delphi 7) they read like this...:

0ÿNew Noteÿÿÿ-1ÿ80ÿ50ÿ65535ÿ16ÿ0ÿ1ÿ10ÿaaaþbbbþcccÿ-1

The new application determines which kind of datafile is to be read and continues loading the file with no errors.

Now I strongly suspect that the unwillingness of the new application to Rewrite(DataFile) has to do with this. It happens not only when an old datafile is (attempted to be) saved, but also a new one.

Any guesses?

Thanks,
Ron dW

View the Solution FREE for 30 Days

20091021-EE-VQP-81

exception on Rewrite(DataFile)

Asked by Ron_de_Weijze in Delphi Programming

Tags: delphi, assignfile, rewrite

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