void debug_msg(QVariant msg) { static int i = 0; QFile file("debug_msg.txt"); if (i == 0) { i = 1; file.open(QFile::WriteOnly | QFile::Truncate | QFile::Text); } else { file.open(QFile::WriteOnly | QFile::Append | QFile::Text); } file.write(msg.toString().toStdString().c_str()); file.write(QString(" ").toStdString().c_str()); file.close(); }