StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

PO(C++)Code::Blocks possible wrong setup for Qt4
primarykey
Id
3096677
data
AcceptedAnswerId
0
AnswerCount
2
ClosedDate
CommentCount
4
CommunityOwnedDate
CreationDate
2010-06-22T20:00:20.620
FavoriteCount
0
LastActivityDate
2010-06-22T21:26:28.440
LastEditDate
LastEditorUserId
0
OwnerUserId
372613
ParentId
0
PostTypeId
1
Score
0
ViewCount
1007
LastEditorDisplayName
text
Body
OS : windows xp SP2 , compiler : Code::Blocks ver. 10.05 , Qt 4.6 I recently started to learn Qt. At first all went well with simple tut examples. I soon came across an example that can not compile and and realized that something is wrong. Here is the code : <pre><code>#include <QWidget> #include <QApplication> #include <QPushButton> #include <QLabel> #include <QDesktopWidget> class Communicate : public QWidget { Q_OBJECT public: Communicate(QWidget *parent = 0); private slots: void OnPlus(); void OnMinus(); private: QLabel *label; }; void center(QWidget *widget, int w, int h) { int x, y; int screenWidth; int screenHeight; QDesktopWidget *desktop = QApplication::desktop(); screenWidth = desktop->width(); screenHeight = desktop->height(); x = (screenWidth - w) / 2; y = (screenHeight - h) / 2; widget->move( x, y ); } Communicate::Communicate(QWidget *parent) : QWidget(parent) { int WIDTH = 350; int HEIGHT = 190; resize(WIDTH, HEIGHT); QPushButton *plus = new QPushButton("+", this); plus->setGeometry(50, 40, 75, 30); QPushButton *minus = new QPushButton("-", this); minus->setGeometry(50, 100, 75, 30); label = new QLabel("0", this); label->setGeometry(190, 80, 20, 30); connect(plus, SIGNAL(clicked()), this, SLOT(OnPlus())); connect(minus, SIGNAL(clicked()), this, SLOT(OnMinus())); center(this, WIDTH, HEIGHT); } void Communicate::OnPlus() { int val = label->text().toInt(); val++; label->setText(QString::number(val)); } void Communicate::OnMinus() { int val = label->text().toInt(); val--; label->setText(QString::number(val)); } int main(int argc, char *argv[]) { QApplication app(argc, argv); Communicate window; window.setWindowTitle("Communicate"); window.show(); return app.exec(); } </code></pre> When I try to open it, I get this message: obj\Release\main.o:main.cpp|| undefined reference to `vtable for Communicate'| obj\Release\main.o:main.cpp|| undefined reference to `vtable for Communicate'| obj\Release\main.o:main.cpp|| undefined reference to `vtable for Communicate'| obj\Release\main.o:main.cpp|| undefined reference to `vtable for Communicate'| obj\Release\main.o:main.cpp|| undefined reference to `vtable for Communicate'| obj\Release\main.o:main.cpp|| more undefined references to `vtable for Communicate' follow| ||=== Build finished: 6 errors, 0 warnings ===| I was looking for a solution to the code:: blocks forum and learned that there should be Qt plugin installed. So , I install QtWorkbench 0.6.0 alpha -> qt plugin but nothing has changed. Any suggestion is welcome.
Tags
<c++><qt4><codeblocks>
Title
(C++)Code::Blocks possible wrong setup for Qt4
singulars
PostAcceptedAnswerId
1. This table or related slice is empty.
PostParentId
1. This table or related slice is empty.
PostTypePostTypeId
1. PTQuestion
UserLastEditorUserId
1. This table or related slice is empty.
UserOwnerUserId
1. USnik_02
plurals
PostLinksPostIdRelatedPostId
1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. This table or related slice is empty.
PostsParentIdCreationDate
1. PO
 singulars
 PostTypePostTypeId
 PTAnswer
2. PO
 singulars
 PostTypePostTypeId
 PTAnswer
VotesPostIdCreationDate
1. This table or related slice is empty.
CommentsPostId

Querying!

Guidance

A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.