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POGUI programming with Qt custom dialog
 

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  1. POGUI programming with Qt custom dialog
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    <p>I'm new with Qt and having some playing-around with it. </p> <p>I picked a sample code from "C GUI programming with Qt 4" and cannot find anything incomprehensive about the code but it doesn't run correctly: </p> <p>** projectfile.pro</p> <pre><code>QT += core gui TARGET = CustomDialog TEMPLATE = app SOURCES += main.cpp \ finddialog.cpp HEADERS += \ finddialog.h </code></pre> <p>** dialog header: </p> <pre><code>#ifndef FINDDIALOG_H #define FINDDIALOG_H #include &lt;QDialog&gt; class QCheckBox; class QLabel; class QLineEdit; class QPushButton; class FindDialog : public QDialog { Q_OBJECT public: FindDialog(QWidget *parent = 0); signals: void findNext(const QString &amp;str, Qt::CaseSensitivity cs); void findPrevious(const QString &amp;str, Qt::CaseSensitivity cs); private slots: void findClicked(); void enableFindButton(const QString &amp;text); private: QLabel *label; QLineEdit *lineEdit; QCheckBox *caseCheckBox; QCheckBox *backwardCheckBox; QPushButton *findButton; QPushButton *closeButton; }; #endif // FINDDIALOG_H </code></pre> <p>** dialog cpp: </p> <pre><code>#include &lt;QtGui&gt; #include "finddialog.h" FindDialog::FindDialog(QWidget *parent) : QDialog(parent) { label = new QLabel(tr("Find &amp;what:")); lineEdit = new QLineEdit; label-&gt;setBuddy(lineEdit); caseCheckBox = new QCheckBox(tr("Match &amp;case")); backwardCheckBox = new QCheckBox(tr("Search &amp;backward")); findButton = new QPushButton(tr("&amp;Find")); findButton-&gt;setDefault(true); connect(lineEdit, SIGNAL(textChanged(const QString &amp;)), this, SLOT(enableFindButton(const QString &amp;))); connect(findButton, SIGNAL(clicked()), this, SLOT(findClicked())); connect(closeButton, SIGNAL(clicked()), this, SLOT(close())); QHBoxLayout *topLeftLayout = new QHBoxLayout; topLeftLayout-&gt;addWidget(label); topLeftLayout-&gt;addWidget(lineEdit); QVBoxLayout *leftLayout = new QVBoxLayout; leftLayout-&gt;addLayout(topLeftLayout); leftLayout-&gt;addWidget(caseCheckBox); leftLayout-&gt;addWidget(backwardCheckBox); QVBoxLayout *rightLayout = new QVBoxLayout; rightLayout-&gt;addWidget(findButton); rightLayout-&gt;addWidget(closeButton); rightLayout-&gt;addStretch(); QHBoxLayout *mainLayout = new QHBoxLayout; mainLayout-&gt;addLayout(leftLayout); mainLayout-&gt;addLayout(rightLayout); setLayout(mainLayout); setWindowTitle(tr("Find")); setFixedHeight(sizeHint().height()); } void FindDialog::findClicked() { QString text = lineEdit-&gt;text(); Qt::CaseSensitivity cs = caseCheckBox-&gt;isChecked() ? Qt::CaseSensitive : Qt::CaseInsensitive; if (backwardCheckBox-&gt;isChecked()) { emit findPrevious(text, cs); } else { emit findNext(text, cs); } } void FindDialog::enableFindButton(const QString &amp;text) { findButton-&gt;setEnabled(!text.isEmpty()); } </code></pre> <p>** main.cpp: </p> <pre><code>#include &lt;QtGui/QApplication&gt; #include "finddialog.h" int main(int argc, char *argv[]) { QApplication a(argc, argv); FindDialog w; w.show(); return a.exec(); } </code></pre> <p>what's wrong here?? </p> <p>when I click run, no dialog is shown but this error:</p> <p><img src="https://i.stack.imgur.com/sRCfd.png" alt="enter image description here"></p>
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    1. COHow does it not run correctly? Does it not compile? What did you expect to happen?
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      1. UScmannett85
    2. COi'm using winxp. And the error seems to be OS error or something: "CustomDialog.exe has encountered a problem and needs to close ....." whereas it should have shown me the finddialog according to my codes
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    3. COWhat does your debugger say?
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      1. POGUI programming with Qt custom dialog
      1. UScmannett85
 

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