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POQt and C++ class giving me an error
 

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    <p>what am I doing wrong?</p> <pre><code>#ifndef MAINWINDOW_H #define MAINWINDOW_H #include &lt;QMainWindow&gt; #include "fileoperations.h" namespace Ui { class MainWindow; } class FileOperations; class MainWindow : public QMainWindow { Q_OBJECT public: explicit MainWindow(QWidget *parent = 0); ~MainWindow(); FileOperations FileController; private slots: void on_OpenButton_clicked(); void on_SaveButton_clicked(); void on_EncodeButton_clicked(); void on_DecodeButton_clicked(); private: Ui::MainWindow *ui; }; #endif // MAINWINDOW_H </code></pre> <p>When i try to compile and run the program, it says:</p> <pre><code>g:\ke\c++ projects\projects\qt\shitlencoder\mainwindow.h:18: error: C2079: 'MainWindow::FileController' uses undefined class 'FileOperations' </code></pre> <p>Here's the strange thing, if I change 'FileOperations FileController;' to 'FileOperations *FileController;'(Obviously this compiles wrongly, because the rest of my codes that you can't see havn't been adapted to '->' instead of '.') Then if I change it back to 'FileOperations FileController;' it lets me compile the program once (And it works fine), then it has the error the next time I try to compile it.</p> <p>I'm using Qt 5.0.</p> <p>fileoperations.h:</p> <pre><code>#ifndef FILEOPERATIONS_H #define FILEOPERATIONS_H #include "ui_mainwindow.h" #include "mainwindow.h" #include &lt;QFileDialog&gt; #include &lt;string&gt; #include &lt;time.h&gt; #include &lt;iostream&gt; #include &lt;conio.h&gt; #include &lt;windows.h&gt; #include &lt;fstream&gt; using namespace std; class FileOperations { public: FileOperations(); void SetInputFile(QString x); void SetOutputFile(QString x); void EncryptAndSave(Ui::MainWindow *NUI); void DecryptAndSave(Ui::MainWindow *NUI); void createid(int id, int id2); int GetCFuncion(); void SetCFuncion(int x); long long Get_Size(string filename); bool Get_Toobig(string path); //DWORD WINAPI Thread_no_1(); private: string InputFilename; string OutputFilename; int CFuncion;//CurrentFunction; vector&lt;int&gt; conbyte1; vector&lt;int&gt; conbyte2; vector&lt;int&gt; opbyte1; vector&lt;int&gt; opbyte2; vector&lt;int&gt; passwordbytes; }; #endif // FILEOPERATIONS_H </code></pre>
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