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POInheritance Error
 

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    <p>I made the following program, but now i am getting an error. I searched for error almost 3 hours but worthless. I want to discuss the problem with you people. I am getting the error: expected class-name before '{' token</p> <pre><code>#ifndef ASKDIALOG_H #define ASKDIALOG_H #include &lt;QDialog&gt; #include "umerwindow.h" namespace Ui { class AskDialog; } class AskDialog : public QDialog, public UmerWindow // HERE IS THE ERROR { Q_OBJECT public: explicit AskDialog(QWidget *parent = 0); void showdialog(); ~AskDialog(); private slots: void on_dokbutton_clicked(); private: Ui::AskDialog *ui; }; #endif // ASKDIALOG_H </code></pre> <p>ASK DIALOG .CPP FILE</p> <pre><code>#include "askdialog.h" #include "ui_askdialog.h" AskDialog::AskDialog(QWidget *parent) : QDialog(parent), ui(new Ui::AskDialog) { ui-&gt;setupUi(this); } AskDialog::~AskDialog() { delete ui; } void AskDialog::on_dokbutton_clicked() { QString data=ui-&gt;dline-&gt;text(); showlist(data); } </code></pre> <p>ASK DIALOG .CPP FILE</p> <pre><code>#include "askdialog.h" #include "ui_askdialog.h" AskDialog::AskDialog(QWidget *parent) : QDialog(parent), ui(new Ui::AskDialog) { ui-&gt;setupUi(this); } AskDialog::~AskDialog() { delete ui; } void AskDialog::on_dokbutton_clicked() { QString data=ui-&gt;dline-&gt;text(); showlist(data); } </code></pre> <p>Ok so this the header file of UmerWindow</p> <pre><code>#ifndef UMERWINDOW_H #define UMERWINDOW_H #include &lt;QMainWindow&gt; #include &lt;QListWidgetItem&gt; #include "askdialog.h" namespace Ui { class UmerWindow; } class UmerWindow : public QMainWindow { Q_OBJECT public: explicit UmerWindow(QWidget *parent = 0); ~UmerWindow(); protected: void showlist(QString &amp;); private slots: void on_actionAdd_Item_triggered(); private: Ui::UmerWindow *ui; QListWidgetItem *itm; AskDialog *dialog; }; </code></pre> <p>and this is the .cpp file of UmerWIndow</p> <pre><code>#include "umerwindow.h" #include "ui_umerwindow.h" #include "askdialog.h" #include &lt;QListWidgetItem&gt; UmerWindow::UmerWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::UmerWindow) { ui-&gt;setupUi(this); dialog= new AskDialog(this); } UmerWindow::~UmerWindow() { delete ui; } void UmerWindow::on_actionAdd_Item_triggered() { dialog-&gt;show(); } void UmerWindow::showlist(QString &amp;data) { } </code></pre> <p>What should i do to resolve this problem? Please help.</p> <p><strong>PS:</strong> I also tried without inheritance, then the compiler gives me a weird <strong><em>error: ISO C++ forbids declaration of 'UmerWindow' with no type</em></strong> and <strong><em>error: expected ';' before '</em>' token*</strong> when i create an pointer object of UmerWindow in askdialog.h file. Now what should i do?</p>
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    1. COWhat's with all those ' characters?
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      1. USErnest Friedman-Hill
    2. COCheck whether you are missing `;` at the end of class declaration in Umerwindow.h class declaration, and why you are forward declaring `AskDialog`?
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    3. COI think what he meant is that, try removing all the single quotes ' and then try compiling..
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      1. USbluefalcon
 

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