[SOLVED] QProcess launching CMD and compiling with it (Windows 8)

petoknm

Hello
I need my project to compile stuff. So I created a QProcess and started CMD(output is redirected to textEdit)... Now if I then write to it "dir \n" it works great... Everything is displayed as it should(exactly the same way as in a real console)... but if instead of writing "dir \n" I write "g++ (parameters, files...)" All I get in the textEdit is the command "g++ (parameters, files...)" but no other output... I don't know why... Any help is appreciated... Thanks :D

code:
@void MainWindow::compileProject(mbedProject *proj,QString *pars){
QString completePars=*pars+" "+proj->file->fileName()+"\n\r";

compilerProcess->start("cmd"&#41;;
if(!compilerProcess->waitForStarted()){
    qDebug("Error starting cmd!");
}else{
    compilerProcess->waitForReadyRead(100);
    compilerProcess->waitForFinished(100);
    //compilerProcess->write(("\""+compilerLocation+"/arm-none-eabi-g++.exe\" "+completePars).toUtf8().constData());
    compilerProcess->write("dir \n");
    compilerProcess->closeWriteChannel();
    compilerProcess->waitForBytesWritten(100);
    compilerProcess->waitForReadyRead(100);
    compilerProcess->waitForFinished(100);
    if(compilerProcess->exitCode()==0){
        qDebug("Compilation Successful!");
    }else{
        qDebug("Compilation Failed!");
        // compilation failed
    }
}

}@
Picture when writing dir \n
https://drive.google.com/file/d/0B0bKAstz-Jy6OEVXT3I4VXhKQVk/edit?usp=sharing
Picture when writing g++...
https://drive.google.com/file/d/0B0bKAstz-Jy6ZXhPZ0d1TWtTV2M/edit?usp=sharing

And if I enter the exact same g++... to a CMD opened at that exact location(also with the ""(because of spaces in the path)) I get output... I know that I can't compile .h files it is just what I had at hand...
And I am redirecting both stdout and stderr(or at least I think so)...
@connect(compilerProcess,SIGNAL(readyRead()),this,SLOT(updateCompilerOutput()));@

@void MainWindow::updateCompilerOutput(){
compilerTextEdit->insertPlainText(compilerProcess->readAll());
compilerTextEdit->verticalScrollBar()->setValue(compilerTextEdit->verticalScrollBar()->maximum());
}@

So what is the difference that causes that dir is ok and g++ is not?

hskoglund

Hi maybe a stupid question but haven't you forgotten the \n, I mean instead try:
@compilerProcess->waitForFinished(100);
compilerProcess->write(("""+compilerLocation+"/arm-none-eabi-g++.exe""+completePars + "\n").toUtf8().constData());
@

dheerendra

I saw your compiler string. It is too big and difficult to experiment. Did you check the command on command line. Copy-paste the same command which is in image you pasted and see it runs. If you are able to run that, you should not have problem here as well

petoknm

[quote author="hskoglund" date="1404339237"]Hi maybe a stupid question but haven't you forgotten the \n, I mean instead try:
@compilerProcess->waitForFinished(100);
compilerProcess->write(("""+compilerLocation+"/arm-none-eabi-g++.exe""+completePars + "\n").toUtf8().constData());
@ [/quote]

I have \n\r in completePars
@QString completePars=*pars+" "+proj->file->fileName()+"\n\r";@

petoknm

[quote author="Dheerendra" date="1404358676"]Copy-paste the same command which is in image you pasted and see it runs. If you are able to run that, you should not have problem here as well[/quote]

https://drive.google.com/file/d/0B0bKAstz-Jy6eTVIQkZNcEVKU2c/edit?usp=sharing

I copy-pasted it and it did output something...(now its a different file) Could it be possibly because of the missing \n? maybe even if I put it to the string but after the conversion to const char* it disappears or something...?

petoknm

And if I enter unknown command ("blahblahblah \n") in CMD I get "blahblahblah is unrecognized...blahblahblah"... and in my app I get nothing... well... I get a new line to enter new command(like if the command executed with no output)

petoknm

And another thing is that if I run this code:
@QString completePars=proj->file->fileName();
connect(compilerProcess,SIGNAL(readyReadStandardOutput()),this,SLOT(updateCompilerOutput()));
connect(compilerProcess,SIGNAL(readyReadStandardError()),this,SLOT(updateCompilerOutput()));
compilerProcess->execute(compilerLocation+"/arm-none-eabi-g++.exe",QStringList(completePars));@

the output comes out in the Application output in Qt Creator but it does not come out in the app... and the slot updateCompilerOutput never gets called...why?

petoknm

Now its fixed... all I needed was this line of code...
@compilerProcess->setProcessChannelMode(QProcess::MergedChannels);@
But thanks for your time :D