请帮忙看下这段程序问题出在哪?(刚从Delphi转QT,第一个例子) - QTCN开发网

离线csm55

只看楼主倒序阅读楼主发表于: 2008-11-19

— 本帖被 XChinux 执行加亮操作(2008-11-20) —

想实现的功能:
UI界面上有有三个控件:
lineEdit_1,lineEdit_2,lineEdit_3;
实现的功能是lineEdit_3=lineEdit_1+lineEdit_2 (算术相加功能)
上面是我写的代码,但编译不过,望高手能帮我解决第一个入门的例子.

复制代码

//Ui_MyCalc.h
#ifndef UI_MYCALC_H
#define UI_MYCALC_H
#include <QtCore/QVariant>
#include <QtGui/QAction>
#include <QtGui/QApplication>
#include <QtGui/QButtonGroup>
#include <QtGui/QLabel>
#include <QtGui/QLineEdit>
#include <QtGui/QWidget>
class Ui_MyCalcForm
{
public:
QLineEdit *lineEdit_1;
QLabel *label;
QLineEdit *lineEdit_2;
QLabel *label_2;
QLineEdit *lineEdit_3;
void setupUi(QWidget *MyCalcForm)
{
if (MyCalcForm->objectName().isEmpty())
MyCalcForm->setObjectName(QString::fromUtf8("MyCalcForm"));
QSize size(400, 300);
size = size.expandedTo(MyCalcForm->minimumSizeHint());
MyCalcForm->resize(size);
lineEdit_1 = new QLineEdit(MyCalcForm);
lineEdit_1->setObjectName(QString::fromUtf8("lineEdit_1"));
lineEdit_1->setGeometry(QRect(30, 40, 41, 20));
label = new QLabel(MyCalcForm);
label->setObjectName(QString::fromUtf8("label"));
label->setGeometry(QRect(78, 43, 16, 16));
lineEdit_2 = new QLineEdit(MyCalcForm);
lineEdit_2->setObjectName(QString::fromUtf8("lineEdit_2"));
lineEdit_2->setGeometry(QRect(90, 40, 41, 20));
label_2 = new QLabel(MyCalcForm);
label_2->setObjectName(QString::fromUtf8("label_2"));
label_2->setGeometry(QRect(138, 42, 16, 16));
lineEdit_3 = new QLineEdit(MyCalcForm);
lineEdit_3->setObjectName(QString::fromUtf8("lineEdit_3"));
lineEdit_3->setGeometry(QRect(150, 40, 41, 20));
lineEdit_3->setReadOnly(true);
retranslateUi(MyCalcForm);
QMetaObject::connectSlotsByName(MyCalcForm);
} // setupUi
void retranslateUi(QWidget *MyCalcForm)
{
MyCalcForm->setWindowTitle(QApplication::translate("MyCalcForm", "Form", 0, QApplication::UnicodeUTF8));
label->setText(QApplication::translate("MyCalcForm", "+", 0, QApplication::UnicodeUTF8));
label_2->setText(QApplication::translate("MyCalcForm", "=", 0, QApplication::UnicodeUTF8));
Q_UNUSED(MyCalcForm);
} // retranslateUi
};
namespace Ui {
class MyCalcForm: public Ui_MyCalcForm {};
} // namespace Ui
#endif // UI_MYCALC_H

复制代码

//MyCalc.h
#ifndef MYCALC_H_INCLUDED
#define MYCALC_H_INCLUDED
#include "Ui_MyCalc.h"
class MyCalcForm: public QWidget
{
Q_OBJECT
public:
MyCalcForm(QWidget *parent = 0);
private slots:
void on_lineEdit_1_textChanged(const QString &value);
void on_lineEdit_2_textChanged(const QString &value);
private:
Ui::MyCalcForm ui;
};
#endif // MYCALC_H_INCLUDED

复制代码

//MyCalc.cpp
#include <QtGui>
#include "MyCalc.h"
MyCalcForm::MyCalcForm(QWidget *parent)
: QWidget(parent)
{
ui.setupUi(this);
}
void MyCalcForm::on_lineEdit_1_textChanged(const QString &value)
{
//ui.lineEdit_3->setText(value); //如果编译能正常通过,这个地方两数相加该怎么写?
}
void MyCalcForm::on_lineEdit_2_textChanged(const QString &value)
{
//ui.lineEdit_3->setText(value);
}

复制代码

//main.cpp
#include <QApplication>
#include <qwidget.h>
#include "MyCalc.h"
int main(int argc, char* argv[])
{
QApplication app(argc, argv);
MyCalcForm calculator;
calculator.show();
return app.exec();
}

编译上面的代码会出现下面这样的错误:
Debug\main.o||In function `ZSt17__verify_groupingPKcjRKSs':|
E:\MinGW\bin\..\lib\gcc\mingw32\3.4.5\..\..\..\..\include\c++\3.4.5\bits\locale_facets.tcc|2498|undefined reference to `vtable for MyCalcForm'|
E:\MinGW\bin\..\lib\gcc\mingw32\3.4.5\..\..\..\..\include\c++\3.4.5\bits\locale_facets.tcc|2499|undefined reference to `vtable for MyCalcForm'|
Debug\MyCalc.o||In function `ZN10MyCalcFormC2EP7QWidget':|
E:\QtTest\MyCalc\MyCalc.cpp|7|undefined reference to `vtable for MyCalcForm'|
E:\QtTest\MyCalc\MyCalc.cpp|7|undefined reference to `vtable for MyCalcForm'|
Debug\MyCalc.o||In function `ZN10MyCalcFormC1EP7QWidget':|
E:\QtTest\MyCalc\MyCalc.cpp|7|undefined reference to `vtable for MyCalcForm'|
Debug\MyCalc.o:E:\QtTest\MyCalc\MyCalc.cpp|7|more undefined references to `vtable for MyCalcForm' follow|
||=== Build finished: 6 errors, 0 warnings ===|

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