Cannot run a simple console program using QProcess

Question

I created a simple Qt app to compile a C++ file using QProcess. Now when I try to run the exe file from the app using QProcess, it doesn't run. When I tried to open the file manually, I got an error saying "libwinpthread-1.dll is missing".

Here's how I compiled the file-

QFileInfo finfo(fileName);
exeFileName = QFileInfo( QDir(finfo.path()), finfo.baseName() + ".exe").filePath();
QStringList arguments;
arguments << fileName << "-o" << exeFileName;
process->start(QString("g++"), arguments);

And, this is the code for running it -

QProcess *runProcess = new QProcess(this);
runProcess->setStandardInputFile(inputFilename);
runProcess->setStandardOutputFile(QFileInfo(exeFileName).path() + "/output.txt");
connect(runProcess, SIGNAL(finished(int)), this, SLOT(runComplete(int)));
runProcess->start(exeFileName);

Basically, I want to compile and run a C++ file, provide it sample input file and store the standard output in a new file. What is wrong with this code? Or any other way of doing it? I am working on windows 7. Also, I cannot understand why does the compiled program need that dll file when compiled from the Qt app and runs fine when compiled manually.

Just in case, this is the file I am trying to compile

//file.cpp
#include <iostream>

int main() {
    std::string s;
    std::cin >> s;
    std::cout << s;
    return 0;
}

Answer 1

I seem to get it working by providing -static option while compiling the file, the exe file produced runs fine without demanding any external .dll file. But still, It doesn't run from QProcess.

Answer 2

You are using API of QProcess in unexpected way. You need to create QStringList of args:

QStringList args;
args << fileName;
args << exeFileName;
...
compileProcess->start("g++", args);