Question

I have a loop that takes file name from a listbox, performs a system() call, then moves that filename to another listbox. Problem is, it doesn’t move the filenames over one at a time, but waits until the entire loop is finished and moves them all at once. What would I do to get it to perform how I want it to?

the loop:

for each( String^% file in filename )
{
    int x = convert( file );
    lbComplete->Items->Add( lbFiles->Items[0] );    // place the completed file
    lbFiles->Items->Remove( lbFiles->Items[0] );    // in the other listbox
}

The function convert() that contains the system call:

int convert( String^ file )
{
    std::stringstream ss;
    std::string dir, fileAddress, fileName, outputDir;
    ...
    return system( ss.str().c_str() );          
}

Answer 1

You would need to call a refresh function at the end of your loop forcing it to redraw your listboxes otherwise it will wait until after your loop to do so.

for each( String^% file in filename )
{
    int x = convert( file );
    lbComplete->Items->Add( lbFiles->Items[0] );    // place the completed file
    lbFiles->Items->Remove( lbFiles->Items[0] );    // in the other listbox
    // INSERT REFRESH FUNCTION HERE
}