Use a [`QFileInfo`][1] to strip out the path (if any):

    QFileInfo fileInfo(f.fileName());
    QString filename(fileInfo.fileName());


  [1]: http://doc.qt.io/qt-4.8/qfileinfo.html#fileName

One approach, not necessarily the best: from a `QFile`, you can get the file specification with [`QFile::fileName()`][1]:

    QFile f(&quot;/home/umanga/Desktop/image.jpg&quot;);
    QString str = f.fileName();

then you can just use the string features like [`QString::split`][2]:

    QStringList parts = str.split(&quot;/&quot;);
    QString lastBit = parts.at(parts.size()-1);

  [1]: http://doc.qt.nokia.com/4.6/qfile.html#fileName
  [2]: http://doc.qt.nokia.com/4.6/qstring.html#split

just in addition: to seperate filename and file path having `QFile f`

    QString path = f.fileName();
    QString file = path.section(&quot;/&quot;,-1,-1);
    QString dir = path.section(&quot;/&quot;,0,-2);

you don&#39;t need to create an additional fileInfo.




I use this:

    bool utes::pathsplit(QString source,QString *path,QString *filename)
    {
    QString fn;
    int index;
    	if (source == &quot;&quot;) return(false);
    	fn = source.section(&quot;/&quot;, -1, -1);
    	if (fn == &quot;&quot;) return(false);
    	index = source.indexOf(fn);
    	if (index == -1) return(false);
    	*path = source.mid(0,index);
    	*filename = fn;
    	return(true);
    }



I use `GZIPOutputStream` or `ZIPOutputStream` to compress a String (my `string.length()` is less than 20), but the compressed result is longer than the original string.

On some site, I found some friends said that this is because my original string is too short, `GZIPOutputStream` can be used to compress longer strings.

so, can somebody give me a help to compress a String?

My function is like:

    String compress(String original) throws Exception {

    }


Update:

    import java.io.ByteArrayOutputStream;
    import java.io.IOException;
    import java.util.zip.GZIPOutputStream;
    import java.util.zip.*;


    //ZipUtil 
    public class ZipUtil {
        public static String compress(String str) {
            if (str == null || str.length() == 0) {
                return str;
            }

            ByteArrayOutputStream out = new ByteArrayOutputStream();
            GZIPOutputStream gzip = new GZIPOutputStream(out);
            gzip.write(str.getBytes());
            gzip.close();
            return out.toString(&quot;ISO-8859-1&quot;);
        }

        public static void main(String[] args) throws IOException {
	        String string = &quot;admin&quot;;
            System.out.println(&quot;after compress:&quot;);
            System.out.println(ZipUtil.compress(string));
        }
    }

 


 The result is :

![alt text][1]


  [1]: http://i.stack.imgur.com/NUYbH.jpg

How to compress a String in Java?

I&#39;m trying to create a php script that will handle a mailing list for me using a mySQL database, and I have most of it in place.  Unfortunately, I can&#39;t seem to get the headers to work right, and I&#39;m not sure what the problem is.

    $headers=&#39;From: noreply@rilburskryler.net \r\n&#39;;
	$headers.=&#39;Reply-To: noreply@rilburskryler.net\r\n&#39;;
	$headers.=&#39;X-Mailer: PHP/&#39; . phpversion().&#39;\r\n&#39;;
	$headers.= &#39;MIME-Version: 1.0&#39; . &quot;\r\n&quot;;
	$headers.= &#39;Content-type: text/html; charset=iso-8859-1 \r\n&#39;;
	$headers.= &quot;BCC: $emailList&quot;;

The result I&#39;m getting on the recieving end is:

&quot;noreply&quot;@rilburskryler.net rnReply-To: noreply@rilburskryler.netrnX-Mailer: PHP/5.2.13rnMIME-Version: 1.0

What is the format for e-mail headers that display a name rather than the e-mail?

eg: 

    QFile f(&quot;/home/umanga/Desktop/image.jpg&quot;);

How I get only the filename - &quot;image.jpg&quot;?

Get filename from QFile?

eg:
<pre><code class="hljs language-arduino">QFile f("/home/umanga/Desktop/image.jpg");
</code></pre>
How I get only the filename - "image.jpg"?

The documentation states that: 

&gt; The Q_OBJECT macro must appear in the
&gt; private section of a class definition
&gt; that declares its own signals and
&gt; slots or that uses other services
&gt; provided by Qt&#39;s meta-object system.

But *exactly* what does that mean? On which QObject-derived classes can I safely omit it? Will problems arise if you omit Q_OBJECT on a QObject-derived class, and then inherit from that one? Basically I would like a little more information on when I can omit it from my Qt classes.

When should Q_OBJECT be used?

I&#39;m playing around with [Qt][1], and I want to create a simple pause between two commands. However it won&#39;t seem to let me use `Sleep(int mili);`, and I can&#39;t find any obvious wait functions.

I am basically just making a console application to test some class code which will later be included in a proper Qt GUI, so for now I&#39;m not bothered about breaking the whole event-driven model.

  [1]: https://en.wikipedia.org/wiki/Qt_%28software%29


How do I create a pause/wait function using Qt?

In the Qt world, what is the difference of events and signal/slots? 

Does one replace the other? Are events an abstraction of signal/slots?


Qt events and signal/slots

I&#39;m using Qt4 and C++ for making some programs in computer graphics. I need to be able to print some variables in my console at run-time, not debugging, but `cout` doesn&#39;t seem to work even if I add the libraries. Is there a way to do this?

How to print to console when using Qt

The &quot;Browse For Folder&quot; Windows dialog is very inconvenient because:

 * it has no Path box where I can paste the path I want (eg from Total Commander)
 * it always starts from the Desktop with everything closed

Is there a way to use the &quot;Open File&quot; dialog (which is much better) to select a Folder? Some flag or option or something?

Context: the [calibre eLibrary manager](http://bugs.calibre-ebook.com/ticket/7160) which is written in Python and Qt.

It currently displays as on the left. I&#39;d like it to display as on the right
![BrowserFileDialog](http://i.stack.imgur.com/CzxbK.gif)

or even better, as the Open File dialog:
![OpenFileDialog](http://i.stack.imgur.com/oy8zG.png)

can the Open File dialog be used to select a Folder?

It&#39;s possible to bind more than one signal to one slot (isn&#39;t?). So, is there a way to understand which widget sends the signal? I&#39;m looking for something like `sender` argument of events in .NET

How to get sender widget with a signal/slot mechanism?

The Qt documentation for QThread says to create a class from QThread, and to implement the run method. 

Below is taken from the 4.7 Qthread documentation...

&gt; To create your own threads, subclass QThread and reimplement run(). For example: 
    
     class MyThread : public QThread
     {
     public:
         void run();
     };
    
     void MyThread::run()
     {
         QTcpSocket socket;
         // connect QTcpSocket&#39;s signals somewhere meaningful
         ...
         socket.connectToHost(hostName, portNumber);
         exec();
     }

So in every single thread I&#39;ve created, I&#39;ve done just that and for most things it works just fine (I do not implement moveToThread(this) in any of my objects and it works great).

I hit a snag last week (managed to get through it by working around where I created my objects) and found the [following blog post][1]. Here is basically says that subclassing QThread really isn&#39;t the correct way to do it (and that the documentation is incorrect).

This is coming from a Qt developer so at first glance I was interested and upon further reflection, agree with him. Following OO principles, you really only want to subclass a class to further enhance that class... not to just use the classes methods directly... thats why you instantiate... 

Lets say I wanted to move a custom QObject class to a thread... what would be the &#39;correct&#39; way of doing it? In that blog post, he &#39;says&#39; he has an example somewhere... but if someone could further explain it to me it&#39;d be greatly appreciated!

**Update:**

Since this question gets so much attention, here is a copy and paste of the 4.8 documentation with the &#39;proper&#39; way to implement a QThread.

 

    class Worker : public QObject
     {
         Q_OBJECT
         QThread workerThread;
    
     public slots:
         void doWork(const QString &amp;parameter) {
             // ...
             emit resultReady(result);
         }
    
     signals:
         void resultReady(const QString &amp;result);
     };
    
     class Controller : public QObject
     {
         Q_OBJECT
         QThread workerThread;
     public:
         Controller() {
             Worker *worker = new Worker;
             worker-&gt;moveToThread(&amp;workerThread);
             connect(workerThread, SIGNAL(finished()), worker, SLOT(deleteLater()));
             connect(this, SIGNAL(operate(QString)), worker, SLOT(doWork(QString)));
             connect(worker, SIGNAL(resultReady(QString)), this, SLOT(handleResults(QString)));
             workerThread.start();
         }
         ~Controller() {
             workerThread.quit();
             workerThread.wait();
         }
     public slots:
         void handleResults(const QString &amp;);
     signals:
         void operate(const QString &amp;);
     };

I still believe that it is worthwhile to point out that they include an extra `Worker::workerThread` member that is unnecessary and is never used in their example. Remove that piece and it is a proper example of how to do threading in Qt.

  [1]: http://blog.qt.io/blog/2010/06/17/youre-doing-it-wrong/

what is the correct way to implement a QThread... (example please...)

This doesn&#39;t seem easy.  Basically, I add `QPushButton`s through a function to a layout, and when the function executes, I want to clear the layout first (removing all `QPushButton`s and whatever else is in there), because more buttons just get appended to the `scrollview`.

header

    QVBoxLayout* _layout;

cpp

    void MainWindow::removeButtonsThenAddMore(const QString &amp;item) {
    
    //remove buttons/widgets
    
    QVBoxLayout* _layout = new QVBoxLayout(this);

    QPushButton button = new QPushButton(item);
    _layout-&gt;addWidget(button);
    
    QPushButton button = new QPushButton(&quot;button&quot;);
    _layout-&gt;addWidget(button);
    
    QWidget* widget = new QWidget();
    widget-&gt;setLayout(_layout);
    
    QScrollArea* scroll = new QScrollArea();
    scroll-&gt;setWidget(widget);
    scroll-&gt;show();
    
    }



Qt - remove all widgets from layout?

`Qt` has a flexible and powerful layout mechanism to handle view of desktop application&#39;s windows.

But it is so flexible, that it nearly cannot be understood, when something goes wrong and needs fine tuning. And so powerful, that it can beat anyone in their tries to overwhelm Qt&#39;s opinion of how form should look.

So, can anyone explain, or provide articles, or source of Qt&#39;s positioning mechanisms?

I&#39;m trying to force the `QLabel`, `QPushButton` and `QTableView`, marked by trailing underscores in their names, be two times higher than `QTextBrowser` having `verticalStretch = 1` below. How can I handle widget&#39;s height properly?

[.ui file of my form on google docs. Search &#39;____&#39; in names, preview in QtDesigner][1]


  [1]: https://docs.google.com/leaf?id=0B60otNVdbWrrZjk2MGZmZjUtOTRkNy00Yjc3LTliZjMtOTJiMThmNzk1YTZh&amp;hl=en

Understanding form layout mechanisms in Qt

I started to fiddle with PyQt, and made a &quot;beautiful&quot; script from the pyqt whitepaper example app ([pastebin][1])

It works perfectly in Windows and Linux (with qt environment already installed on both).

Now my question is: Since I am trying to use Qt because it is compiled (at least pure old C++ based Qt), how can I compile some .exe file to run it on Windows, or a standalone executable for Linux.

The point is that I want the program to be compiled, because of speed and portability, instead of interpreted from source, which would require a previous setup on any machine. One of the goals, for example, is sending small gui scripts via email to coworkers who are not programmers at all.

  [1]: http://pastebin.com/NZnpxv2F

Content Type	Original Author	Original Content on Stackoverflow
Question	Ashika Umanga Umagiliya	View Question on Stackoverflow
Solution 1 - Qt	Arnold Spence	View Answer on Stackoverflow
Solution 2 - Qt	paxdiablo	View Answer on Stackoverflow
Solution 3 - Qt	refuzee	View Answer on Stackoverflow
Solution 4 - Qt	fyngyrz	View Answer on Stackoverflow

Get filename from QFile?

Qt Problem Overview

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What is the format for e-mail headers that display a name rather than the e-mail?

How to compress a String in Java?

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