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POQt 5.1.0 for Windows 32-bit (VS 2010, 505 MB) doesn't work
 

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    <p>I have downloaded four Qt 5.1.0 packages:</p> <p>Qt 5.1.0 for Windows 32-bit (MinGW 4.8, OpenGL, 666 MB)</p> <p>Qt 5.1.0 for Windows 32-bit (VS 2010, 505 MB)</p> <p>Qt 5.1.0 for Windows 64-bit (VS 2012, 525 MB)</p> <p>Qt 5.1.0 for Windows 64-bit (VS 2012, OpenGL, 522 MB)</p> <p>After installed all these four packages, I created a very simple QT project by using <strong>Qt 5.1.0 for Windows 32-bit (VS 2010, 505 MB)</strong></p> <p>The project is a Qt gui application with a ui form. I created it just follow the Qt Creator's template without typing any word. After that I built this project and run, everything is OK.</p> <p>Then I added a new C++ class to the project. The added C++ class's base class is QWidget. This time, I still did not type any word in the .cpp and .h file. So the added class only was created by Qt Creator. After that I built this project again, and run, everything is still OK.</p> <p>Now I began to add my code. I added one line in the mainwindow.h:</p> <pre><code>#include "myclass.h" </code></pre> <p>Then I added another line in the mainwindow.cpp:</p> <pre><code>pMyClass = new CMyClass(this); </code></pre> <p>After that I built this project again, this time two errors happened.</p> <pre><code>error LNK2001: unresolved external symbol public: __thiscall CMyClass::CMyClass(class QWidget *)" (??0CMyClass@@QAE@PAVQWidget@@@Z) error LNK1120: 1 unresolved externals </code></pre> <p>I built the same project by using another three Qt versions:</p> <p>Qt 5.1.0 for Windows 32-bit (MinGW 4.8, OpenGL, 666 MB)</p> <p>Qt 5.1.0 for Windows 64-bit (VS 2012, 525 MB)</p> <p>Qt 5.1.0 for Windows 64-bit (VS 2012, OpenGL, 522 MB)</p> <p>Build and run were all successful. Everything is OK. </p> <p>Because my project can be built and run successfully by using</p> <p>Qt 5.1.0 for Windows 32-bit (MinGW 4.8, OpenGL, 666 MB)</p> <p>Qt 5.1.0 for Windows 64-bit (VS 2012, 525 MB)</p> <p>Qt 5.1.0 for Windows 64-bit (VS 2012, OpenGL, 522 MB)</p> <p>I am pretty sure there is nothing wrong in my project. </p> <p>Only using <strong>Qt 5.1.0 for Windows 32-bit (VS 2010, 505 MB)</strong> errors happen.</p> <p>I was confused by the results. I checked the build directories and I found <strong>VS 2010 did not compile mycalss.cpp!</strong> All other three build directories have the .obj files or .o files of myclass. So when link, errors happened.</p> <p>My System is Windows7 64bit Ultimate. Does anyone know how to solve this problem?</p>
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