Get qt application output to Qwidget c++

Question

I build an app that execute linux command through C++ Qt GUI I read from the file and show the output normally but sometimes the output from file is data = "" and the output that - in normal show in terminal - show in Application output so I want to get a application output to Qwidget such as QTextEdit

like
cat:: /home/user/Desktop: Is ad directory , the function I used it is

QString operation :: commands(std::string usercommand){
const char * convertor = userCommand.c_str();
string data;
FILE *f =popen(convertor,"r");
char buffer [1024];
while (fgets(buffer,sizeof(buffer)-1,f)!=NULL){data=data+buffer;}
pclose(f);
QString returning = QString::fromStdString(data);  return returning; }

I would use QProcess instead of this.

drescherjm
– drescherjm

2017-05-02 22:35:53 +00:00
Commented May 2, 2017 at 22:35 — drescherjm
– drescherjm, Commented May 2, 2017 at 22:35

eyllanesc · Accepted Answer · 2017-05-02 23:36:20Z

1

If you are working with Qt you should use QProcess

QString operation::commands(QString program)
{    
    QProcess process;
    process.start(program);
    while (process.waitForFinished()){
        ;
    }
    QString resp = QString::fromLocal8Bit(process.readAllStandardOutput());
    QString error = QString::fromLocal8Bit(process.readAllStandardError());
    return resp + error;
}

Use:

QString usercommand = "cat /home/user/Desktop";
commands(usercommand);

edited May 2, 2017 at 23:36

answered May 2, 2017 at 23:07

eyllanesc

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2 Comments

Sameh Mohamed Omr Over a year ago

what 's the QString program parameter should be ?

Sameh Mohamed Omr Over a year ago

I did it, thanls again

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