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    <a href="#QtforEmbedded">Qt for Embedded</a>
    <ol>
      <li>
        <a href="#InstructionsforHelloWorldQTE4.8.6onYocto1.7">Instructions for Hello World QTE 4.8.6 on Yocto 1.7</a>
        <ol>
          <li>
            <a href="#DownloadPre-BuiltQTEImageandSDK">Download Pre-Built QTE Image and SDK</a>
          </li>
          <li>
            <a href="#BuildingtheQTEImage">Building the QTE Image</a>
          </li>
          <li>
            <a href="#CreatingtheHelloWorldProgram">Creating the Hello World Program</a>
          </li>
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      </li>
    </ol>
  </li>
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<h1 id="QtforEmbedded">Qt for Embedded</h1>
<p>
Qt for Embedded Linux is a C++ framework for GUI and application development for embedded devices.
</p>
<h2 id="InstructionsforHelloWorldQTE4.8.6onYocto1.7">Instructions for Hello World QTE 4.8.6 on Yocto 1.7</h2>
<p>
<strong>Note these instructions were made using Yocto 1.7 which may no longer be the latest</strong>
</p>
<h3 id="DownloadPre-BuiltQTEImageandSDK">Download Pre-Built QTE Image and SDK</h3>
<p>
Download the following files here:
</p>
<ul><li><a class="ext-link" href="http://blog.gateworks.com/?wpdmpro=gateworks-image-qte-ventana-tar-bz2"><span class="icon">​</span>QTE rootfs tarball</a> - <a class="wiki" href="/wiki/Yocto/Building#InstallingonRemovablestorage:mSATAUSBuSDSD">SD Card flashing instructions here</a>
</li><li><a class="ext-link" href="http://blog.gateworks.com/?wpdmpro=poky-glibc-x86_64-meta-toolchain-qte-cortexa9hf-vfp-neon-toolchain-qte-1-7-2-sh"><span class="icon">​</span>QTE SDK File</a>
</li></ul><h3 id="BuildingtheQTEImage">Building the QTE Image</h3>
<p>
The steps below first require building Yocto from source documented <a class="wiki" href="/wiki/Yocto/Building">here</a>
</p>
<p>
Then, after building, to include QTE 4.8.6, we have modified a base Gateworks recipe file.
</p>
<p>
Below are the lines we have added:
</p>
<pre class="wiki">inherit qt4e

IMAGE_INSTALL += "${QT4EDEPENDS}" 

IMAGE_INSTALL += "\
qt-in-industrial-embedded-smarthome-e \
"
</pre><ul><li>Create a copy of a Gateworks recipe file in /sources/meta-gateworks/recipes-core/images/ and call it gateworks-image-qte.bb (or download attached recipe file and place in /sources/meta-gateworks/recipes-core/images/)
</li></ul><ul><li>Create Image and SDK
<ul><li>Create qte supported image: <tt>bitbake gateworks-image-qte</tt>
</li><li>Create SDK: <tt>bitbake -cpopulate_sdk gateworks-image-qte</tt>
</li><li>Download SDK .sh file and follow <a class="wiki" href="/wiki/Yocto/SDK">SDK instructions</a>
</li></ul></li></ul><h3 id="CreatingtheHelloWorldProgram">Creating the Hello World Program</h3>
<ul><li>Create a new directory and place in it a main.cpp with example code
<ul><li>
<pre class="wiki">#include &lt;QApplication&gt;
#include &lt;QPushButton&gt;
#include &lt;QWidget&gt;
 
int main(int argc, char **argv)
{
 QApplication app (argc, argv);
 QPushButton button ("Hello world !");
 button.showFullScreen();
 
 return app.exec();
}

</pre></li></ul></li><li>Use qmake to create a project file (creates .pro file named off directory you are in using the source files in the directory)
<ul><li><tt>qmake -project</tt>
</li></ul></li><li>Use qmake to create makefile using -spec (which uses the project file from the previous step and a mkspecs config directory from the SDK)
<ul><li><tt>qmake -spec $SDKTARGETSYSROOT/usr/share/qtopia/mkspecs/qws/linux-arm-gnueabi-g++</tt>
</li></ul></li><li>You must also tweak Makefile
<ul><li>Comment out CC and CXX and STRIP 
</li><li>Set: <tt>LINK= $(CXX)</tt>
</li><li>Modify AR line to say: <tt> arm-none-linux-gnueabi-ar cqs</tt>
</li><li>The total and final lines that are changed in the Makefile:
<pre class="wiki">#CC            = arm-none-linux-gnueabi-gcc
#CXX           = arm-none-linux-gnueabi-g++
#STRIP         = arm-none-linux-gnueabi-strip
AR            = arm-poky-linux-gnueabi-ar cqs
LINK          = $(CXX)
</pre></li></ul></li><li>Run make
<ul><li><tt>make</tt>
</li><li>Find binary output 
<pre class="wiki">ryan@ryan-Inspiron-660:~/Downloads/helloworld$ file helloworld
helloworld: ELF 32-bit LSB executable, ARM, EABI5 version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.32, BuildID[sha1]=34e0476f18f251ac85b72131957382f0bd00faeb, not stripped
</pre></li></ul></li><li>Copy application to the Ventana board via a method like wget
<ul><li>chmod the application to be executable
</li></ul></li><li>Run the application
<ul><li><tt> ./helloworld -qws </tt>
</li></ul></li></ul
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