qt4

问题 I followed all the steps successfully as mention in the Qt documentation: Qt for Linux/X11 - Building from Source Qt for Linux/X11 - Deployment But I still couldn't make static Qt application, the executable generated by the above documented steps still needs Qt shared objects on other system. Any ideas? 回答1: You need to deploy the application, for this purpose I use the utility cqtdeployer This utility itself collects all the necessary dependencies of your application and you do not have to

问题 I followed all the steps successfully as mention in the Qt documentation: Qt for Linux/X11 - Building from Source Qt for Linux/X11 - Deployment But I still couldn't make static Qt application, the executable generated by the above documented steps still needs Qt shared objects on other system. Any ideas? 回答1: You need to deploy the application, for this purpose I use the utility cqtdeployer This utility itself collects all the necessary dependencies of your application and you do not have to

问题 Is there a way to build Qt in "Release with Debug info" mode ? My application crashes only in "release" mode (works fine in Debug mode) and seems the issue comes from Qt (may be a bug in Qt).So I want to see the debug info of Qt. Qt docs has "debug" , "release" but not "release with debug" mode. [Upate] My application works fine with Mingw 32bit Release/Debug and VSC++ Compiler 64bit Debug. Only crashes on VSC++ 64Bit Release Any tips ? 回答1: Update: See @milanw's answer below. This is now

问题 In my program I need to download a file, and I came across this article: http://www.java2s.com/Code/Cpp/Qt/DownloadfromURL.htm This code does work but it doesn't fit into my program so I re-coded it. I haven't completed it all but I've got the basics coded. However, when I test it, it pops up with a send error report window. So far this is my code: QtDownload.h #include <QObject> #include <QString> #include <QNetworkAccessManager> #include <QNetworkReply> class QtDownload : public QObject { Q

问题 Here's the thing: In my Qt4.6-Project, I use a SQLite-Database. This database shouldn't be unencrypted on my harddrive. So I want, that on every start of my program, the user gets asked to enter a password to decrypt the database. Of course the database never should appear "in clear" (not encrypted) on my harddrive. So is there any possibility to decrypt a SQLite-database "on the fly" and read and write data? What algorithm is here the best (maybe AES)? When it's not possible (or very slow),

问题 I need a QPushButton with two colors in the text. I found a solution with a html code in QTextDocument and it's working. But I need center align and the html code isn't working. QTextDocument Text; Text.setHtml("<p align=center><font>Button</font><br/><font color=yellow>1</font></p>"); QPixmap pixmap(Text.size().width(), Text.size().height()); pixmap.fill( Qt::transparent ); QPainter painter(&pixmap); Text.drawContents(&painter, pixmap.rect()); QIcon ButtonIcon(pixmap); ui->toolButton-

问题 I wrote the below code for a qt gui to view the query output in a QTableView(Model oriented). now i want to save this output as a .csv or .txt file. There were suggestions to use QTableWidget(Item oriented) but I would like to stick to the model based approach. void MainWindow::on_pushButton_clicked() { db = QSqlDatabase::addDatabase("QOCI"); db.setHostName("host"); db.setDatabaseName("db"); db.setUserName("uid"); db.setPassword("pw"); db.setPort(port); QString MyQuery = ui->lineEdit->text();

问题 Is there an easy way to setup the User-Agent the QWebView class is using? The only relevant link I found searching was this http://www.qtforum.org/article/27073/how-to-set-user-agent-in-qwebview.html I'm learning C++/Qt right now and I don't really understant what's explained on that website. Maybe someone knows an easy way to do it? Or can help me understand that code? 回答1: Qt allows you to provide a user agent based on the URL rather than a single user agent no matter what the URL is. The

问题 I am using one signal and slot connection in a block. My code as follows in a.cpp { QObject::connect(m_ptheFlange2Details,SIGNAL(GetFlang1DimAfterAnalysis()), this,SLOT(GetFlang1DimAftrAnalysis())); m_ptheFlange2Details->get();// one function inside which i am emiting // GetFlang1DimAfterAnalysis() signal ; QObject::disconnect(m_ptheFlange2Details,SIGNAL(GetFlang1DimAfterAnalysis()), this,SLOT(GetFlang1DimAftrAnalysis())); } Inside the get() function when this emit statement executes, the

问题 This question is already asked in this forum but I don't understand the concept. I was reading around and it seems that signal and slots are implemented using function pointers i.e the signal is one big function which inside it calls all connected slots (function pointers). Is this correct? And what is the role of the generated moc files in the whole story? I don't understand how the signal function knows which slots to call i.e which slots are connected to this signal. Thanks for your time