Qt serial port program crashes when run on another system - c++

Question

I modified this code on a Windows 10 PC, and it compiled and ran without crashing.
#include <QtSerialPort/QSerialPort>
#include <QTextStream>
#include <QCoreApplication>
#include <QFile>
#include <QStringList>
QT_USE_NAMESPACE
int main(int argc, char *argv[])
{
QCoreApplication coreApplication(argc, argv);
int argumentCount = QCoreApplication::arguments().size();
QStringList argumentList = QCoreApplication::arguments();
QTextStream standardOutput(stdout);
if (argumentCount == 1) {
standardOutput << QObject::tr("Usage: %1 <serialportname> [baudrate]").arg(argumentList.first()) << endl;
return 1;
}
QSerialPort serialPort;
QString serialPortName = argumentList.at(1);
serialPort.setPortName(serialPortName);
int serialPortBaudRate = (argumentCount > 2) ? argumentList.at(2).toInt() : QSerialPort::Baud9600;
serialPort.setBaudRate(serialPortBaudRate);
if (!serialPort.open(QIODevice::WriteOnly)) {
standardOutput << QObject::tr("Failed to open port %1, error: %2").arg(serialPortName).arg(serialPort.errorString()) << endl;
return 1;
}
QFile dataFile("C:\\SerialCommand.dat");
if (!dataFile.open(QIODevice::ReadOnly)) {
standardOutput << QObject::tr("Failed to open file for reading") << endl;
return 1;
}
QByteArray writeData(dataFile.readAll());
dataFile.close();
if (writeData.isEmpty()) {
standardOutput << QObject::tr("Either no data was currently available on the standard input for reading, or an error occurred for port %1, error: %2").arg(serialPortName).arg(serialPort.errorString()) << endl;
return 1;
}
qint64 bytesWritten = serialPort.write(writeData);
if (bytesWritten == -1) {
standardOutput << QObject::tr("Failed to write the data to port %1, error: %2").arg(serialPortName).arg(serialPort.errorString()) << endl;
return 1;
} else if (bytesWritten != writeData.size()) {
standardOutput << QObject::tr("Failed to write all the data to port %1, error: %2").arg(serialPortName).arg(serialPort.errorString()) << endl;
return 1;
} else if (!serialPort.waitForBytesWritten(5000)) {
standardOutput << QObject::tr("Operation timed out or an error occurred for port %1, error: %2").arg(serialPortName).arg(serialPort.errorString()) << endl;
return 1;
}
standardOutput << QObject::tr("Data successfully sent to port %1").arg(serialPortName) << endl;
printf("\n\ntest");
return 0;
}
I set Qt to release mode, and packaged the application with the following .dll files:
msvcp120d.dll
msvcr120d.dll
Qt5Core.dll
Qt5Cored.dll
Qt5SerialPort.dll
Qt5SerialPortd.dll
Qt5Widgets.dll
qwindows.dll
When I ran the application on another system (also windows 10), the program crashes immediately - and yes, I did move SerialCommand.dat to its correct location on the C drive. Any thoughts?

Answer 1

You're packaging the debug versions of the dlls (ending with a d) instead of release ones.
Read the Qt deployment docs, especially the last part (from "Application Dependencies" to the end).
The dependency walker helps find the actual dependencies, and in theory windeployqt should automate the work of creating a release dir with all the files you need.
See also this other question, but it's for an app using QML, so it's more complex than your case.