How to convert QIcon to BASE64 or save it to file?

[Alex Snet]

Hi 2 all.

Please, help.
How I can convert QIcon to BASE64?

UPD

I make it in thread. And QPixmap says that it is not save to use it outside GUI thread.
"QPixmap: It is not safe to use pixmaps outside the GUI thread"

How?

this is a piece of my code:

QDir dir( path );
QFileIconProvider icon;
foreach (QFileInfo rootDir, dir.entryInfoList() )
{
   QIcon ico = icon.icon( rootDir );
}

QDir dir( path );
QFileIconProvider icon;
foreach (QFileInfo rootDir, dir.entryInfoList() )
{
   QIcon ico = icon.icon( rootDir );
}

To copy to clipboard, switch view to plain text mode 

I make a threaded media-server and I will paste Icons of files to web interface. How I can do this?


UPD 2

Or how I can save QIcon to file?