How to write a Qt .pro file?
Qt project file(.pro file) is used to control the build of projects. I seldom use that because I’m scared by so many mysterious macros. But if you do not want […]
How to use an external lib in Qt project?
To add an external library to Qt project, you should know the answer to the following questions: how to add lib search path in qt project? LIBS += -L d:/dev/externallib/lib […]
How to build Botan using Mingw under Windows?
I downloaded an open source Qt project which uses Botan library. Specifically, the project includes Botan header files in its source files such as: include <botan/pipe.h> And the project links […]
parent process cannot kill child process built with windows subsystem
Normally, Qt process will terminate child process created with QProcess when the parent process exits, even you do not explicitly call the terminate or kill function of the child QProcess […]
How to remove a layout
To delete a layout from its containing layout, you may use parentlayout->removeItem(childlayout); However, the widgets on the child layout remain visible. Layout has no setVisible or hide method for you […]
Qt program cannot start due to fail to load Qt platform plugin “windows”
If you deploy your Qt program to another host, you may get this error when running the program on that computer: This application failed to start because it could not […]
curl_getinfo return good while curl_exec return false
For not once, I encounter this problem: curl_exec returns false but curl_getinfo returns a valid object. I even see the http_code=200 and header_size is a good number. Why curl_exec always […]
QTextDocument::setHtml slow
I used the following code to convert html to plain text: QTextDocument doc; doc.setHtml( html); QString txt= doc.toPlainText(); Things went well until one day the program hang. After debugging, it […]
html entity in xml and its parsing
$dom = new DOMDocument(); $dom->load(“test.xml”); $text=$dom->getElementsByTagName(“Name”)->item(0)->nodeValue; The above code lines get the text between <Name></Name> Suppose the text between the tags is: <Name>http://myprogrammingnotes.com/index.php?p1=value1&p2=http%3A%2F%2Fgoogle.com</Name> what would $text be? Is $text “http://myprogrammingnotes.com/index.php?p1=value1&p2=http%3A%2F%2Fgoogle.com” […]
php regular expression memo
\b is kind of special, it is not a character, neither a class of characters. It represents a change from a word character(letters, numbers, underscore) to a non-word character(or end […]