How to get executable name in Qt

Question

I run a Qt application, what I want to know is this running binary file name.

Pumice

Answer 1

I must (partially) disagree with the other comments that it is not a Qt question: There is a Qt method QCoreApplication::applicationFilePath() which gives the directory+filename of the executable.

On Linux this will try to use /proc, and on Windows perhaps GetModuleFileName(). According to the docs it will fall back to argv[0].

You could then use QFileInfo to split it into an executable name and a directory.

QFileInfo(QCoreApplication::applicationFilePath()).fileName()

Ruminate

+1. And for the application directory, you can use QCoreApplication::applicationDirPath(). – Tericaterina

I got: QCoreApplication::applicationFilePath: Please instantiate the QApplication object first – Vincentia

qApp->applicationFilePath(); – Alwyn

Thanks @Cameron. Was looking for that. :D – Atwater

QApplication a(argc, argv); QString appPath = a.applicationFilePath(); – Orthorhombic

Answer 2

The Qapplication parses the commandline arguemnts, the first entry is the name of the executable - this is roughly the same as argv[0] in standard C but has a few extra complexities on windows if you have a Unicode build or if the application is started as a service

See http://doc.qt.io/qt-5/qcoreapplication.html#arguments

Monday

Answer 3

Again not really a Qt question. To find the name of the binary file executed it would be something like.

#include <iostream>
using namespace std;
int main(int argc, char **argv)
{
  cout << argv[0] << endl;
  return 0;
}

Wittol

I'm unsure as to why your concern about it being a Qt question is relevant. The OP is simply stating the environment they're using, no different to if they had said "Linux" or Windows" or, for that matter, "C++". It's extra information which can help target the answers. In this particular case, it's useful because Qt provides a much better way to get this info - as per the ISO standard, argv[0] is not required to actually hold any useful information about the executable. see https://mcmap.net/q/175168/-when-can-argv-0-have-null/… for details. – Nosology