Printing progressbar

[H?vard Sj?voll]

Anyone got any code for how to print a progressbar in a console-window?

That is, - something like

"Loading: X%"

where X is continousely updated.

-håvard-

 

[Sree]

Standard C++ doesn't offer any way to do it. You have to refer to your system
related console programming manuals for it.

 

[Unforgiven]

Anyone got any code for how to print a progressbar in a console-window?

That is, - something like

"Loading: X%"

for( int x = 0; x <= 100; ++x )
{
std::cout << "Loading: " << x << "%\r" << std::flush;
// do something
}

\r without \n sends the cursor back to the beginning of the line but not to
a new line, so you can overwrite the previous contents of the line. This is
afaik the only standards-compliant portable way to do it.

 

[Victor Bazarov]

Anyone got any code for how to print a progressbar in a console-window?

That is, - something like

"Loading: X%"

where X is continousely updated.

Something like

std::cout << "\rLoading: " << Xvalue << '%';

The behaviour of your terminal when \r is printed to it is of course
OS-specific, but it usually works the way you want it.

Don't forget to print 'std::endl' when you're done to move to the next
line.

Victor

 

[Allan Bruce]

Something like

std::cout << "\rLoading: " << Xvalue << '%';

The behaviour of your terminal when \r is printed to it is of course
OS-specific, but it usually works the way you want it.

Don't forget to print 'std::endl' when you're done to move to the next
line.

Victor

If this doesnt work, another way I found was to use several \b - so
basically:

for (int i=0; i<LengthOfProgressInChars; i++)
std::cout << "\b";
std::cout << "\rLoading: " << Xvalue << '%';

Allan

 

[Mike Weller]

Something like

std::cout << "\rLoading: " << Xvalue << '%';

The behaviour of your terminal when \r is printed to it is of course
OS-specific, but it usually works the way you want it.

Don't forget to print 'std::endl' when you're done to move to the next
line.

Victor

Yeah I think the best way to do this is with your final progress bar
dislpayed as, for example:

[0%...25%...50%...75%...100%]

And progressivly add a '.' or number to the end. Something like this:

//----------------------------
cout << "[";

for ( int x = 0; x <= 100; x++ )
{
if ( !( x % 20 ) ) // display every 20th number
cout << x << "%";
else if ( !( x % 5) ) // otherwise display a dot every 5 numbers
cout << ".";
}

cout << "]";
//----------------------------

 

[Mike Weller]

Something like

std::cout << "\rLoading: " << Xvalue << '%';

The behaviour of your terminal when \r is printed to it is of course
OS-specific, but it usually works the way you want it.

Don't forget to print 'std::endl' when you're done to move to the next
line.

Victor

Yeah I think the best way to do this is with your final progress bar
dislpayed as, for example:

[0%...25%...50%...75%...100%]

And progressivly add a '.' or number to the end. Something like this:

//----------------------------
cout << "[";

for ( int x = 0; x <= 100; x++ )
{
if ( !( x % 20 ) ) // display every 20th number
cout << x << "%";
else if ( !( x % 5) ) // otherwise display a dot every 5 numbers
cout << ".";
}

cout << "]";
//----------------------------

 

[Owen Jacobson]

If this doesnt work, another way I found was to use several \b - so
basically:

for (int i=0; i<LengthOfProgressInChars; i++)
std::cout << "\b";
std::cout << "\rLoading: " << Xvalue << '%';

<platform-specific behaviour>

Watch it with that. If you go too far backwards, some versions of Windows
(NT-based ones) will bluescreen spectacularly.

<http://homepages.tesco.net/~J.deBoynePollard/FGA/csrss-backspace-bug.html>

</platform-specific behaviour>

 

[Unforgiven]

<platform-specific behaviour>

Watch it with that. If you go too far backwards, some versions of Windows
(NT-based ones) will bluescreen spectacularly.

<http://homepages.tesco.net/~J.deBoynePollard/FGA/csrss-backspace-bug.html>

</platform-specific behaviour>

Yup. The bug was fixed in Windows 2000 SP3 and Windows XP SP1. In NT4 it'll
remain a bug forever.