How to get file type Icon ?

[wirasto]

So far, I get icon file like this

QIcon Olongia::fileIcon(const QString &filename)
{
    QFileInfo info(filename);
    const QString ext=info.suffix().toLower();
 
    QIcon icon;
    if (ext == "pdf") {
        icon=QIcon::fromTheme("application-pdf");
    } else if (ext.startsWith("doc")) {
        icon=QIcon::fromTheme("application-msword");
    } else if (ext=="zip" ||
                  ext=="gz"  ||
                  ext=="bz2" ) {
        icon=QIcon::fromTheme("application-x-archive");
    } else if (ext=="png" ||
                  ext=="jpg"  ||
                  ext=="gif"  ||
                  ext=="svg" ||
                  ext=="bmp") {
        icon=QIcon::fromTheme("image-x-generic");
    } else {
         QProxyStyle s;
          icon=s.standardIcon (QStyle::SP_FileIcon);
    }
 
    return icon;
}

QIcon Olongia::fileIcon(const QString &filename)
{
    QFileInfo info(filename);
    const QString ext=info.suffix().toLower();

    QIcon icon;
    if (ext == "pdf") {
        icon=QIcon::fromTheme("application-pdf");
    } else if (ext.startsWith("doc")) {
        icon=QIcon::fromTheme("application-msword");
    } else if (ext=="zip" ||
                  ext=="gz"  ||
                  ext=="bz2" ) {
        icon=QIcon::fromTheme("application-x-archive");
    } else if (ext=="png" ||
                  ext=="jpg"  ||
                  ext=="gif"  ||
                  ext=="svg" ||
                  ext=="bmp") {
        icon=QIcon::fromTheme("image-x-generic");
    } else {
         QProxyStyle s;
          icon=s.standardIcon (QStyle::SP_FileIcon);
    }

    return icon;
}

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I think that is not efficient, and after read qtdoc I get new trick like this

QFileInfo info(filename);
QFileIconProvider ip;
QIcon icon=ip.icon(info);

QFileInfo info(filename);
QFileIconProvider ip;
QIcon icon=ip.icon(info);

To copy to clipboard, switch view to plain text mode 

But, that code only working if file is exists in local system. And I need get file type icon for file not exists in local system ? Like QFtp example, only get the filename and show in the TreeViewWidget ?

Thank's before and sorry about my suck english