File errors in Ubuntu

mythbusterma

I'm using Ubuntu 11.04 (this problem has persisted since 10.04) and trying to write to a file as follows

@openFileT1.setFileName(lastName.append(".comp"));
openFileT2.setFileName(lastName.append(".k"));
openFileT1.open(QFile::ReadWrite);
openFileT2.open(QFile::ReadWrite);
fileStream.setDevice(&openFileT1);
serialStream.setDevice(&openFileT2);
if (!openFileT2.isOpen() || !openFileT2.isWritable()) {
return NULL;

}
openFileT1.write("test");

debugPrint(openFileT1.errorString());

serialStream << QString("0xN0500576");

@

where lastName is a valid string (I checked) and with the directory being declared

@QDir::setCurrent("/home/XXXX/");@

before that

Every time I run this, my debug console says the error is "Unknown Error", does anyone know what might be causing this?

ZapB

Please post a small compilable example that reproduces the problem. Some things to check:

does /home/XXXX/ exist and do you have write-permissions to that directory?
what do the two calls to open() return?
what types are fileStream and serialStream?
why are you apparently attaching a stream on your QFile object and then calling write() directly on the QFile object?

mythbusterma

/home/XXXX/ is a valid directory, and even when run as root I run into the same problem
They return true
fileStream is a QTextStream and serialStream is a QDataStream (according to the debugger both objects are valid during runtime)
This was a byproduct of my attempts at fixing it, I tried to see whether writing to the file directly would fix the problem, it doesn't

Thanks for viewing my post :)

ZapB

OK please provide a small example we can try then.

mythbusterma

When I go and look at the file, the file has been created and has the correct name, but it's completely empty.

fluca1978

This is just a guess...maybe the file is empty because you did not close/flush it. And you are displaying an error string always, even I didn't find any reference on errorstring returning an empty string if no error has happened, so maybe the print is normal.

ZapB

Again, please post a small example that shows the problem...then we can help you.

mythbusterma

Ahhhh....many thanks, the flushing/closing did the trick, many thanks fluca.