Friday, April 27, 2012

Upload photo on facebook using Qt

Some time back I wrote blog post about how to Post message on facebook wall, Here is link.

This post I will show how to upload a photo from local machine to facebook. On facebook photo can be uploaded to application's album or existing album created by user or application.

Where photo will be uploaded is decided by URL used during http requst. will upload photo to application's album, will upload photo to specific album indicated by ALBUM_ID.

My code describe method to upload photo to application's album. You can visit this post to know how to login and how to post message on facebook wall.

This post describe process how to upload photo using php, I tried to convert that code to Qt code. As code shows that photo is uploaded using multipart/form-data method, we need to create post request with multipart/form-data method.

Following code describe the process.

void FacebookHelper::uploadPicture(const QString& picLocation, 
    const QString& comment) {
    if( !isAuthorized() ) {
        qDebug() << "Please login first...";
        emit messageStatus(1,"Please login first...");

   // Show photo upload form to user and post to the Graph URL
    QString uploadUrl = ""
       + mAccessToken;

    QFileInfo fileInfo(picLocation);
    QFile file(picLocation);
    if (! {
        qDebug() << "Can not open file:" << picLocation;
        emit messageStatus(2,"Could not open file" + picLocation);

    QString bound="---------------------------723690991551375881941828858";
    QByteArray data(QString("--"+bound+"\r\n").toAscii());
    data += "Content-Disposition: form-data; name=\"action\"\r\n\r\n";
    data += "\r\n";
    data += QString("--" + bound + "\r\n").toAscii();
    data += "Content-Disposition: form-data; name=\"source\"; filename=\""
    data += "Content-Type: image/"+fileInfo.suffix().toLower()+"\r\n\r\n";
    data += file.readAll();
    data += "\r\n";
    data += QString("--" + bound + "\r\n").toAscii();
    data += QString("--" + bound + "\r\n").toAscii();
    data += "Content-Disposition: form-data; name=\"message\"\r\n\r\n";
    data += comment.toAscii();
    data += "\r\n";
    data += "\r\n";

    QNetworkRequest request(uploadUrl);
           QString("multipart/form-data; boundary=" + bound).toAscii());
    mCurrentRequest =,data);

Monday, April 9, 2012

Logitech MK220 Wireless Combo

Yesterday I received my logitech wireless mouse and keyboard(MK220 Wireless Combo). I wanted to use it with my ubuntu laptop and was worried if it will be compatible with my ubuntu or not.

Before purchasing I tried to check logitech support site to verify it works with linux or not, but logitech site list support for only windows. But I still purchased it and hoping of it to work fine. But after receiving it, I plugged its wireless signal receiver to my laptop and inserted battery to keyboard and mouse and It worked, without my doing anything. Well I was thinking, I will be required do some hack to make it work, but I am glad that ubuntu has out of box support for this device.

After receiving it I tried to use keyboard, keyboard is lightweight and vary portable, initially I felt that its keys are cramped and my finger can't find keys that easily as it do on full size keyboard and also found its arrow Key are placed at awkward position and difficult to find it easily but after working a while on it now it quite comfortable.

Following are few snaps of product. I shared this post here in hope to remove similar doubts of compatibility that I had before purchasing this product.