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 );
}

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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?

[sophister]

This is what I find:

QString filename = QFileDialog::getOpenFileName(this, tr("选择要添加的程序"), qApp->applicationDirPath(), tr("Excutable(*.*)"));
    if(filename.isEmpty())
    {
        return;
    }
 
    QFileInfo fileInfo(filename);
    QFileIconProvider seekIcon;
    QIcon icon = seekIcon.icon(fileInfo);
    QPixmap pixmap = icon.pixmap(QSize(15, 15));
    if(!pixmap.save(tr("%1.png").arg(fileInfo.baseName()), "png"))
    {
        qDebug() << "Save icon failed!!";
        return;
    }
    else
    {
        qDebug() << "Save icon succeeded!!!";
    }

QString filename = QFileDialog::getOpenFileName(this, tr("选择要添加的程序"), qApp->applicationDirPath(), tr("Excutable(*.*)"));
    if(filename.isEmpty())
    {
        return;
    }

    QFileInfo fileInfo(filename);
    QFileIconProvider seekIcon;
    QIcon icon = seekIcon.icon(fileInfo);
    QPixmap pixmap = icon.pixmap(QSize(15, 15));
    if(!pixmap.save(tr("%1.png").arg(fileInfo.baseName()), "png"))
    {
        qDebug() << "Save icon failed!!";
        return;
    }
    else
    {
        qDebug() << "Save icon succeeded!!!";
    }

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hope it can help you!

[Alex Snet]

Thank U for try. But I can't use QPixmap in thread. It just doesn't work in thread.
Any ideas?

[wysota]

Convert the icon to QImage in the main thread and then pass it to the other thread. On the other hand then you don't need the other thread - you can just encode the image into base64 and save it to a file from the main thread.

[Alex Snet]

Ok. But how I can say to the main thread from socket thread to open Icon?
I get file name in thread. It's just a small HTTP server. And I wanna set icons to files and folders.

[wysota]

I don't know the structure of your program so it's hard to give a ready-made solution. Signals and slots seem to be a good candidate although the real question is if you need threads at all.