Originally posted by: UDOPS

With reference to this example from the documentation:

execute {
var f = new IloOplOutputFile();
f.open("output.txt");
if (f.isOpen) writeln("f is open");
else writeln("f is closed");
f.writeln("Hello World");
f.close();
if (f.isOpen) writeln("f is open");
else writeln("f is closed");
}
I believe whenever I call the first line, it creates a new file that replaces any file with the same name. What if I want to save the contents of the existing file and append to it?
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Originally posted by: Olivier Binckly

I don't think it's possible to append in the current version of OPL (maybe it will in a future version).
However you may be able to achieve this with some external JAVA calls.
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Originally posted by: SystemAdmin

UDOPS,

good question !! I would be interested in a solution as well. The only
pure OPL-workaround I am aware of is reading the file, storing it in an
array of strings and rewrite it - definitely a hack!!

Maybe someone of the OPL team can clarify this and put this feature
onto the wish list ...

The suggestion with the Java-code is probably the best workaround.

Best regards
Norbert
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Originally posted by: ArnaudS

This feature will be available in CPLEX Studio 12.2
(i.e: the release after OPL 6.3)

Regards,
Arnaud
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Originally posted by: SystemAdmin

Thanks for the info.

Norbert
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Originally posted by: UDOPS

Thanks! Looking forward to version 12.2!
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Originally posted by: IbrahimC

Hi all,

I was not able to append the output file.
I am using version 12.2 build id: b00030.

Here is the part of the code:
var ofile= new IloOplOutputFile();
ofile.open("L://Result//test.txt", append);

Thanks in advance.
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