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POLinker error when moving function to a different file in VS2010 with Qt Add-in
 

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  1. POLinker error when moving function to a different file in VS2010 with Qt Add-in
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    <p>I have a function to convert from one image representation (<code>MyImage</code>) to a <code>QImage</code>, and I decided it would be tidier to dedicate a namespace to functions that interface in this manner. I previously had this function directly in the class representing my main <code>QMainWindow</code>.</p> <p>So, I created a file <code>MyFormatToQtInterfacing.h</code> which looks as follows:</p> <pre><code>#include &lt;QtGui/QMainWindow&gt; #include &lt;qlabel.h&gt; namespace MyFormatToQtInterfacing { // These functions below convert a cv::Mat to a QImage. // Adapted from http://stackoverflow.com/questions/5026965/how-to-convert-an-opencv-cvmat-to-qimage // The grayscale ones seem to be inverted. Look into this later. QImage MyImage2QImage(const MyImage &amp;src) { //snip }; }; </code></pre> <p>I then call the function from this new namespace, as you would expect, and I get the following linker error:</p> <blockquote> <p>1>main.obj : error LNK2005: "class QImage _<em>cdecl MyFormatToQtInterfacing::Mat2QImage(class MyImage2QImage const &amp;)" (?MyImage2QImage@MyFormatToQtInterfacing@@YA?AVQImage@@ABV?$Mat</em>@V?$Vec@E$02@cv@@@cv@@@Z) already defined in moc_Tracker.obj</p> <p>1>Tracker.obj : error LNK2005: "class QImage _<em>cdecl MyFormatToQtInterfacing::MyImage2QImage(class MyImage2QImage const &amp;)" (?MyImage2QImage@MyFormatToQtInterfacing@@YA?AVQImage@@ABV?$Mat</em>@V?$Vec@E$02@cv@@@cv@@@Z) already defined in moc_Tracker.obj</p> <p>1>C:\Projects\Tracker\Tracker.exe : fatal error LNK1169: one or more multiply defined symbols found</p> </blockquote> <p>I've also been subbing out MyImage with OpenCV matrices and getting the same problem. Why is this happening and how can I resolve it?</p>
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