我是一个使用 C++ 中的 Qt Creator 的应用程序。 int main()函数如下。 我正在启动一个 QDialog 窗口,在其中获取“url”变量内容。
如何将此变量放入 mainwindow.cpp 文件中。
QApplication a(argc, argv);
MainWindow *w; //Put it here in case you have several cases where you want to initialize it
QLoginDialog d; //Your login dialog
if(d.exec()==QDialog::Accepted)
{
if(d.isLogged()) //Check the variable used to validate the login
{
w = new MainWindow;
w->show();
}
else
{
//Handle bad login
return -1; //Don't forget to return something here
}
}
else
{
//Handle dialog not validated
return -1; //Don't forget to return something here
}
return a.exec();
主窗口.cpp
MainWindow::MainWindow(QWidget *parent):
QMainWindow(parent),
ui(new Uİ::MainWindow)
{
QDialog s;
s.show();
s.setmodel(true);
if(s.exec()==QDialog::Accepted)
{
if(s.URL=="true")
{
ui.setupUi(this);
}
}
}
QDialog.cpp=Start.cpp源代码:
#include "start.h"
#include "ui_start.h"
Start::Start(QWidget *parent) :
QDialog(parent),
ui(new Ui::Start)
{
ui->setupUi(this);
}
Start::~Start()
{
delete ui;
}
void Start::on_pushButton_2_clicked()
{
QString dirName=QFileDialog::getExistingDirectory(
this,
tr("Select a Directory"),
QDir::currentPath());
if(!dirName.isNull())
ui->lineEdit_2->setText(dirName);
}
void Start::on_pushButton_3_clicked()
{
URL=ui->lineEdit->text();
Directory=ui->lineEdit_2->text();
if(URL.isEmpty() && Directory.isEmpty())
{
QMessageBox::warning(this,tr("Error"),tr("Please, fill in the blanks"));
}
else if(URL.isEmpty())
{
QMessageBox::warning(this,tr("Error"),tr("is not a valid URL or Path!!"));
}
else if(Directory.isEmpty())
{
QMessageBox::warning(this,tr("Error"),tr("is not a select directory!!"));
}
ControlConfiguration();
}
void Start::ControlConfiguration()
{
QString configPosition= ui->lineEdit_2->text();
QString str1="CHECKOUT_HOME";
QString str2="new_checkout.csh";
QString str3="setup_prjsvn.csh";
QMessageBox *msgBox=new QMessageBox(this);
int sayac=0;
QDir path(configPosition);
QStringList files=path.entryList(QDir::Files);
for(int i=0; i<files.length(); i++)
{
if(files[i].compare(str1)==0)
{
sayac=sayac+1;
}
}
for(int i=0; i<files.length(); i++)
{
if(files[i].compare(str2)==0)
{
sayac=sayac+1;
}
}
for(int i=0; i<files.length(); i++)
{
if(files[i].compare(str3)==0)
{
sayac=sayac+1;
}
}
if(sayac>=3)//Attention Flurent. if true, open QMainWindow
{
QMessageBox::information(this,tr(" "),tr("Configuration Directory"));
//s_path=ui->lineEdit->text();
this->hide();
s_path="true";
URL=ui->lineEdit_2->text();
}
else
{
msgBox->setInformativeText("Would you like to configure?");
msgBox->setStandardButtons(QMessageBox::Cancel | QMessageBox::No | QMessageBox::Yes);
msgBox->setDefaultButton(QMessageBox::Yes);
int ret = msgBox->exec();
switch(ret){
case QMessageBox::Yes:
Configuration();
break;
case QMessageBox::No:
//ui->locationEdit->clear();
break;
case QMessageBox::Cancel:
break;
}
}
}
void Start::Configuration()
{
QString projePosition= ui->lineEdit_2->text(); // Proje konumu alınır.
QProcess* process=new QProcess(this);
QMessageBox *msgBox=new QMessageBox(this);
process->setWorkingDirectory(projePosition);
QString svn_export="svn export http://atlas/svn/prjsvn/trunk/common/common_bin/istanbul/new_checkout.csh";
QString s_newcheckout="source new_checkout.csh";
QString s_prjsvn="source setup_prjsvn.csh";
process->start("tcsh -c \""+svn_export+";"+s_newcheckout+";"+s_prjsvn+"\"");
process->waitForBytesWritten();
process->waitForFi
}
最佳答案
您应该正确了解信号和槽,以便在对象之间传递变量。文档在这里:http://doc.qt.io/qt-4.8/signalsandslots.html
另一种方法是在主窗口中执行 QDialog,这将是最佳实践。在有用的范围内使用控件。您不必在主函数中使用对话框。
所以,看看这两种解决方案。对于简单变量,最好的方法是在将使用该值的类内执行对话框,第二种方法是如果必须在复杂的类之间传递值,则使用信号和槽。
main.cpp
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow *w; //Put it here in case you have several cases where you want to initialize it
QLoginDialog d; //Your login dialog
if(d.exec()==QDialog::Accepted)
{
if(d.isLogged()) //Check the variable used to validate the login
{
w = new MainWindow(d.getUrl()); //I guess the URL comes from your login dialog, so make a function that returns it
w->show();
}
else
{
//Handle bad login
return -1; //Don't forget to return something here
}
}
else
{
//Handle dialog not validated
return -1; //Don't forget to return something here
}
return a.exec();
}
主窗口.cpp
//Don't forget to add the "QString sUrl" to your mainwindow.h
MainWindow::MainWindow(QString sUrl, QWidget *parent): QMainWindow(parent), ui(new Uİ::MainWindow)
{
ui.setupUi(this);
qDebug()<<s.URL; //It will be displayed here
}
你的dialog.cpp
//Use this to return the boolean value that represents if the path is valid or not.
bool QDialog::isLogged()
{
return this->s_path.equals("true");
}
关于c++ - 如何使用 Qt C++ 在 QDialog Window 和 QMainWindow 之间进行通信,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/41137413/