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I'm exporting data to a text file in qt every time a run a code. With my current code that file is overwritten each time. My question is how can I set the title to be a variable eg pulse_freq, this way new files will be created based on my variable values. I just can't get the syntax right.

Is there a way to put my files in a folder in the same directory as my build files? I need my code to be cross platform and if I use the full path name it's apparently incompatible with any non-windows OS. If I just name the files there'd be too much clutter in the folder. Relevant code is below:

// Export to data file
        QString newname = QString::number(variables.nr_pulses);
        QString filename = "C:/Users/BIC User/Documents/BIC Placement Documents/QT_data/Data.txt";
        QFile file( filename );
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You can just use something along lines:

QString s1 = "something";
QString s2 = " else";
QString s3 = s1 + s2;

QString concatenation with overloaded operator+ works like charm.

And about referencing folder you're in, instead of hardcoding its path, use QDir::currentPath()

Thus, your filename creation should look like the following:

QString folder = QDir::currentPath();
QString file = QString::number(variables.nr_pulses); //or whatever else you want it to be
QString extension = ".txt" // or whatever extension you want it to be

QString full_filename = folder + file + extension;

In order not to mess with appending string after the extension, just separate it into another QString and concatenate those 3 elements as above (folder + file + extension).

于 2015-01-29T11:18:11.140 回答