@Developer123
The code answers there all implement sending Qt error messages within an application to a file. Perfectly useful in itself, but nothing to do with the topic title here of "How to redirect stdout & stderr to a file in a Qt console App (QCoreApplication)".

@JonB Thanks! That saved me a good deal of troubleshooting. It turned out the problem was a hard path to a file inside the C program which caused it to run correctly when invoked from it's native directory, but caused a segfault when called by Qt since the paths were different. The problem is completely fixed now.

@Johnx8664 Learning Qt4 at this point would be a waste of your time. Like @SGaist said it's long past it's end of life. Qt5 is 12 major releases into it's life cycle now and 5 years old now.

I would grab a book on Qt5, or I find it's pretty easy to learn Qt just from the docs that come with it. If you know C++ well (and you should if you are tackling Qt), then you should be fine learning from the Qt Assistant docs. There are a lot of examples and tutorials in there as well.

@RDiGuida To add to @Mario84's answer, QString is Qt based class and your using standard c++ API's to print it which it doesnot understand. To print values of pure Qt based API's you can use qDebug().
Eg:

QString dt ((dates[0]).toString()); qDebug() << dt;