本主题与此相关:
Qt Creator 2.8.1 Qt 5.1.1 Qt Designer Linux Show a new Form
所以我创建了一些新对象:
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
DialogPreviewHeader PreviewHeader;
Ui_DialogPreviewHeader UIDialog;
然后去使用它们:
void MainWindow::on_pushButtonPreviewHeader_clicked()
{
QString SendTxt = ui->lineEditClassName->text();
UIDialog.textBrowserPreviewHeaderFile->setPlainText(SendTxt);
PreviewHeader.show();
}
以前,显示表单工作正常,现在似乎因使用UIDialog
而崩溃。 textBrowserPreviewHeaderFile
指针在Ui_DialogPreviewHeader
类中设置,在调试时不为null。
另一个问题是学习如何连接mainWidget和amp;带有插槽的表格。
修改
当我这样做时:
void MainWindow::on_pushButtonPreviewHeader_clicked()
{
QString SendTxt = ui->lineEditClassName->text();
//UIDialog.textBrowserPreviewHeaderFile->setPlainText(SendTxt);
PreviewHeader.ui->textBrowserPreviewHeaderFile->setPlainText(SendTxt);
//PreviewHeader->ui->textBrowserPreviewHeaderFile->setPlainText(SendTxt);
//pushButtonPreviewHeader(SendTxt);
PreviewHeader->show();
}
各种组合无法编译:
->
- PreviewHeader
不是指针
.ui
- 'Ui :: DialogPreviewHeader * DialogPreviewHeader :: ui'是私有的
使PreviewHeader成为指针并使用 - >表格也说DialogPreviewHeader :: ui'是私有的。
我也尝试过实现一个插槽,但另一种方式是将MainWindow改为DialogPreviewHeader:
DialogPreviewHeader::DialogPreviewHeader(QWidget *parent) :
QDialog(parent),
ui(new Ui::DialogPreviewHeader)
{
ui->setupUi(this);
connect(
&MainWindow,
SIGNAL(pushButtonPreviewHeader(QString)),
this,
SLOT(ReceiveDataFromMainWidget(QString)));
}
但它不喜欢&MainWindow
。
任何方式 - 如果我发布所有代码会更好。我应该摆脱这个EDIT&把它贴在这里,还是做另一个问题?
好的 - 这是所有的代码 - 将来我会在开始时这样做!
#ifndef DIALOGPREVIEWHEADER_H
#define DIALOGPREVIEWHEADER_H
#include <QDialog>
namespace Ui {
class DialogPreviewHeader;
}
class DialogPreviewHeader : public QDialog
{
Q_OBJECT
public:
explicit DialogPreviewHeader(QWidget *parent = 0);
~DialogPreviewHeader();
private slots:
void on_buttonBox_accepted();
void ReceiveDataFromMainWidget(QString);
private:
Ui::DialogPreviewHeader *ui;
};
#endif // DIALOGPREVIEWHEADER_H
MainWindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include "DialogPreviewHeader.h"
#include "ui_DialogPreviewHeader.h"
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
//DialogPreviewHeader PreviewHeader;
//Ui_DialogPreviewHeader UIDialog;
private slots:
void on_pushButtonPreviewHeader_clicked();
void pushButtonPreviewHeader(QString);
void on_pushButtonPreviewImplFile_clicked();
void on_pushButtonWriteFiles_clicked();
void on_lineEditNSNames_textChanged(const QString &arg1);
void on_radioButtonNSIndividual_clicked();
void on_radioButtonOneNSAlias_clicked();
void on_lineEditClassName_textChanged(const QString &Text);
void on_lineEditClassNamePrepend_textEdited(const QString &arg1);
void on_pushButtonCancel_clicked();
void on_checkBoxPrependCharClassName_clicked();
private:
Ui::MainWindow *ui;
DialogPreviewHeader *PreviewHeader;
//Ui_DialogPreviewHeader.textBrowserPreviewHeaderFile *pHeader;
//textBrowserPreviewHeaderFile *pHeader;
};
#endif // MAINWINDOW_H
DialogPreviewHeader.h
#include "DialogPreviewHeader.h"
#include "ui_DialogPreviewHeader.h"
#include "MainWindow.h"
#include "ui_MainWindow.h"
DialogPreviewHeader::DialogPreviewHeader(QWidget *parent) :
QDialog(parent),
ui(new Ui::DialogPreviewHeader)
{
ui->setupUi(this);
connect(
Ui::MainWindow,
SIGNAL(pushButtonPreviewHeader(QString)),
this,
SLOT(ReceiveDataFromMainWidget(QString)));
}
DialogPreviewHeader::~DialogPreviewHeader()
{
delete ui;
}
void DialogPreviewHeader::on_buttonBox_accepted()
{
this->hide();
}
的main.cpp
#include "MainWindow.h"
#include <QApplication>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();
return a.exec();
}
MainWindow.cpp
#include "MainWindow.h"
#include "ui_MainWindow.h"
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent), ui(new Ui::MainWindow)
{
ui->setupUi(this);
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::on_pushButtonPreviewHeader_clicked()
{
QString SendTxt = ui->lineEditClassName->text();
//UIDialog.textBrowserPreviewHeaderFile->setPlainText(SendTxt);
//PreviewHeader.ui->textBrowserPreviewHeaderFile->setPlainText(SendTxt);
//PreviewHeader->ui->textBrowserPreviewHeaderFile->setPlainText(SendTxt);
pushButtonPreviewHeader(SendTxt);
PreviewHeader->show();
}
void MainWindow::pushButtonPreviewHeader(QString) {
}
void MainWindow::on_pushButtonPreviewImplFile_clicked()
{
}
void MainWindow::on_pushButtonWriteFiles_clicked()
{
}
void MainWindow::on_lineEditNSNames_textChanged(const QString &arg1)
{
}
void MainWindow::on_radioButtonNSIndividual_clicked()
{
}
void MainWindow::on_radioButtonOneNSAlias_clicked()
{
}
void MainWindow::on_lineEditClassName_textChanged(const QString &Text)
{
}
void MainWindow::on_lineEditClassNamePrepend_textEdited(const QString &arg1)
{
}
void MainWindow::on_pushButtonCancel_clicked()
{
this->close();
}
void MainWindow::on_checkBoxPrependCharClassName_clicked()
{
}
您需要表格还是ui_标题?
编译器输出:
04:48:04: Running steps for project ClassWiz...
04:48:04: Configuration unchanged, skipping qmake step.
04:48:04: Starting: "/usr/bin/make"
g++ -c -pipe -std=c++11 -Wall -Wextra -pedantic -g -Wall -W -D_REENTRANT -fPIE -DQT_QML_DEBUG -DQT_DECLARATIVE_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -I/opt/Qt5.1.1/5.1.1/gcc_64/mkspecs/linux-g++ -I../ClassWiz -I/opt/Qt5.1.1/5.1.1/gcc_64/include -I/opt/Qt5.1.1/5.1.1/gcc_64/include/QtWidgets -I/opt/Qt5.1.1/5.1.1/gcc_64/include/QtGui -I/opt/Qt5.1.1/5.1.1/gcc_64/include/QtCore -I. -I. -I. -o DialogPreviewHeader.o ../ClassWiz/DialogPreviewHeader.cpp
../ClassWiz/DialogPreviewHeader.cpp: In constructor 'DialogPreviewHeader::DialogPreviewHeader(QWidget*)':
../ClassWiz/DialogPreviewHeader.cpp:12:26: error: expected primary-expression before ',' token
make: *** [DialogPreviewHeader.o] Error 1
04:48:05: The process "/usr/bin/make" exited with code 2.
Error while building/deploying project ClassWiz (kit: Desktop Qt 5.1.1 GCC 64bit)
When executing step 'Make'
04:48:05: Elapsed time: 00:01.
答案 0 :(得分:2)
以下行不正确:
Ui_DialogPreviewHeader UIDialog;
你不被允许这样做。这条线就足够了:
DialogPreviewHeader PreviewHeader;
而不是:
UIDialog.textBrowserPreviewHeaderFile->setPlainText(SendTxt);
使用此:
PreviewHeader->ui->textBrowserPreviewHeaderFile->setPlainText(SendTxt);
就您的第二个问题而言,如果您想将小部件(mynewwidget)中的数据发送到主窗口,请尝试以下方法:
在窗口小部件(头文件)中创建一个信号,例如:
信号: void myData(QString);
现在假设您要将小部件(mynewwidget)中的字符串数据发送到主窗口,现在只需调用myData就像一个简单的函数,您可以从mynewwidget类中发送数据,例如你想发送“你好”:
myData("Hello");
现在,在MainWindow类的构造函数中,您需要将信号myData(QString)与MainWindow的任何插槽连接,并使用与widget类信号相同的签名。在mainwindow的构造函数中,您需要为连接添加此行:
connect(&mynewwidget,SIGNAL(myData(QString)),this,SLOT(myRData(QString)));
其中myRData是MainWindow中的一个插槽。插槽只是可以直接调用以及使用信号调用的函数。在主窗口类中,一个插槽将是这样的:
Slots:
myRData(QString);
现在每当调用myData时,MyRData也会被调用。请注意,信号没有函数体,只能通过它们传递数据。
编辑:示例
#ifndef DIALOGPREVIEWHEADER_H
#define DIALOGPREVIEWHEADER_H
#include <QDialog>
namespace Ui {
class DialogPreviewHeader;
}
class DialogPreviewHeader : public QDialog
{
Q_OBJECT
public:
explicit DialogPreviewHeader(QWidget *parent = 0);
~DialogPreviewHeader();
private slots:
void on_buttonBox_accepted();
//void ReceiveDataFromMainWidget(QString); // not needed
public: // made public
Ui::DialogPreviewHeader *ui;
};
#endif // DIALOGPREVIEWHEADER_H
MainWindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include "DialogPreviewHeader.h"
#include "ui_DialogPreviewHeader.h"
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
DialogPreviewHeader PreviewHeader;
private slots:
void on_pushButtonPreviewHeader_clicked();
void pushButtonPreviewHeader(QString);
void on_pushButtonPreviewImplFile_clicked();
void on_pushButtonWriteFiles_clicked();
void on_lineEditNSNames_textChanged(const QString &arg1);
void on_radioButtonNSIndividual_clicked();
void on_radioButtonOneNSAlias_clicked();
void on_lineEditClassName_textChanged(const QString &Text);
void on_lineEditClassNamePrepend_textEdited(const QString &arg1);
void on_pushButtonCancel_clicked();
void on_checkBoxPrependCharClassName_clicked();
private:
Ui::MainWindow *ui;
//DialogPreviewHeader *PreviewHeader; not needed
//Ui_DialogPreviewHeader.textBrowserPreviewHeaderFile *pHeader;
//textBrowserPreviewHeaderFile *pHeader;
};
#endif // MAINWINDOW_H
DialogPreviewHeader.h
#include "DialogPreviewHeader.h"
#include "ui_DialogPreviewHeader.h"
// #include“MainWindow.h”//再也不这样做了 // #include“ui_MainWindow.h”//这也是
DialogPreviewHeader::DialogPreviewHeader(QWidget *parent) :
QDialog(parent),
ui(new Ui::DialogPreviewHeader)
{
ui->setupUi(this);
/*connect( // never do this again
Ui::MainWindow,
SIGNAL(pushButtonPreviewHeader(QString)),
this,
SLOT(ReceiveDataFromMainWidget(QString)));*/
}
DialogPreviewHeader::~DialogPreviewHeader()
{
delete ui;
}
void DialogPreviewHeader::on_buttonBox_accepted()
{
this->hide();
}
的main.cpp
#include "MainWindow.h"
#include <QApplication>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();
return a.exec();
}
MainWindow.cpp
#include "MainWindow.h"
#include "ui_MainWindow.h"
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent), ui(new Ui::MainWindow)
{
ui->setupUi(this);
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::on_pushButtonPreviewHeader_clicked()
{
QString SendTxt = ui->lineEditClassName->text();
//Make sure Ui::DialogPreviewHeader *ui; is public in dialogpreviewheader.h
PreviewHeader.ui-&GT; textBrowserPreviewHeaderFile-&GT; setPlainText(SendTxt);
pushButtonPreviewHeader(SendTxt);
PreviewHeader->show();
}
void MainWindow::pushButtonPreviewHeader(QString) {
}
void MainWindow::on_pushButtonPreviewImplFile_clicked()
{
}
void MainWindow::on_pushButtonWriteFiles_clicked()
{
}
void MainWindow::on_lineEditNSNames_textChanged(const QString &arg1)
{
}
void MainWindow::on_radioButtonNSIndividual_clicked()
{
}
void MainWindow::on_radioButtonOneNSAlias_clicked()
{
}
void MainWindow::on_lineEditClassName_textChanged(const QString &Text)
{
}
void MainWindow::on_lineEditClassNamePrepend_textEdited(const QString &arg1)
{
}
void MainWindow::on_pushButtonCancel_clicked()
{
this->close();
}
void MainWindow::on_checkBoxPrependCharClassName_clicked()
{
}