Need help!!!!! Problem in running a program with the help of QProcess

[parulkalra14]

First of all I make a file which reads program written on plainTextEdit and batch file for output and i am able to reterive the output from batch file and display it to another plainTextEdit but problem arises in case of cin and scanf statements .For example :

#include<iostream>
using namespace std;
int main()
{
int a,b;
cout<<"Enter two numbers";
cin>>a>>b;
return 0;
}
When i compiled this program a batch file will open that does not contain Enter two numbers statement that means it can take the input only but does show cout/printf statements,that is creating problem because user will not be able to detect what to enter. As i understands the problem and know what to enter in a batch file suppose i enetered 2 3 so output reterive to a plainTextEdit is correct i.e Enter two numbers 2 3. But problem occurs at User Console/Command Prompt.

Code is :
bool MainWindow::run_file()
{
QMessageBox msgBox;
QString program = "cons.bat";
QString st="PRESS OKK!!";
QStringList arguments;
QProcess *proc = new QProcess(this);
proc->startDetached(program);

if(proc->NotRunning)
msgBox.setText(st);
msgBox.exec();
proc->waitForFinished();


display_output();
return(true);

}
void MainWindow::display_output()
{

QFile file("out.txt");
if(!file.open(QIODevice::ReadOnly)) {
QMessageBox::information(0, "error", file.errorString());
}
//QTextStream str(&file);

QString out_str;

while (!file.atEnd())
{
out_str=file.readAll();
}
ui->plainTextEdit_3->clear();
ui->plainTextEdit_3->insertPlainText(out_str);
file.remove()
}

In an attached file output.png Enter two numbers is not written. As i know i have to enter two numbers then i entered 2 3 but out.txt contain the whole program output like:
Enter two numbers 2 3

But problem is with console window.

[anda_skoa]

This continued opening of the same thread over and over again it really getting annoying.
It means one of the admins has to search for the duplicate and manually merge the thread.

When i compiled this program a batch file will open that does not contain Enter two numbers statement

When you compile a program then it is not executed.
Building and running are two very different operations.

Code is :

For the love of $DETIY use code tags.

QProcess *proc = new QProcess(this);
    proc->startDetached(program);
 
    if(proc->NotRunning)
   msgBox.setText(st);
   msgBox.exec();
   proc->waitForFinished();

QProcess *proc = new QProcess(this);
    proc->startDetached(program);
 
    if(proc->NotRunning)
   msgBox.setText(st);
   msgBox.exec();
   proc->waitForFinished();

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That does not make any sense at all.

QProcess::startDetached() is a static method, "proc" will be totally unaffected.

NotRunning is a state enum value, not a public variable. That condition is always false (NotRunning == 0).

The message box should probably not always be executed.

Cheers,
_