Qt Console Application Problems

mahmoud899

Hello, I am having difficulties to understand why my program is being executed wrong. When I run the program, the console screen appears and awaits from me to enter a number, and when I enter a number then press enter, it then prints the following:

Hello World
Please Enter Your Age
Your Age is
56

Any suggestions as why is this happening?? Thank You,
@
#include <QTextStream>

int main(int argc, char *argv[])
{
int age;

QTextStream output(stdout);
QTextStream input(stdin);

output << "Hello World\n\n";
output << "Please Enter Your Age:\n";

input >> age;

output << "Your Age is: \n";
output << age;

}
@

MuldeR

What about:

@QFile myStdOut;
file.open(stdout, QIODevice::WriteOnly | QIODevice::Unbuffered);

QTextSTream output(&myStdOut)
output << "Hello World\n\n";
output << "Please Enter Your Age:\n";

input >> age;@

--

Note however:

The "stdout" and "stderr" streams have their own buffering too! If they are connected directly to a "real" console, this is disabled automatically. But as soon as the output of a console application gets redirect, e.g. your console application is created as a child process via QProcess, you will notice the buffering! That means, regardless of the QTextStream or QFile buffering, you should be doing this, in order to make sure outputs aren't delayed:

@for(int i = 0; i <= 100; i++)
{
//Do some work that takes time
doSomeWork(i);

//Write current progress
fprintf(stdout, "Progress: %d %%\n", i);

//required flushing!
fflush(stdout);

}@

mahmoud899

Thank you for all of your replies, the output.flush() worked well.