Qt

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Uses

Download of 4.x and 5.x version

http://download.qt-project.org/official_releases/

For example, the source code for 5.0.1 can be downloaded from http://download.qt-project.org/official_releases/qt/5.0/5.0.1/single/

Transition of Qt 4.x to 5

http://qt-project.org/wiki/Transition_from_Qt_4.x_to_Qt5

How to distribute Qt application

In my first example of GUI with button & label, I need to put 7 dll files in the same exe directory.

  • icudt49.dll (17MB)
  • icuin49.dll (1.3MB)
  • icuuc49.dll (1MB)
  • Qt5Cored.dll (7MB)
  • Qt5Guid.dll (5.5MB)
  • Qt5Widgets.dll (4MB)
  • Qt5Widgetsd.dll (7.5MB)

Google: how to reploy application on windows, how to build qt contains all dll static on windows

How to Build static Qt on Windows


My experience based on Qt 4.8.4

  • Download and install Perl (no need for python, ruby for Qt 4.8).
  • Unzip source file in zip format and put it under C:\Qt
  • Rename C:\Qt\qt-everywhere-opensource-src-4.8.4 to C:\Qt\4.8.4
  • Open c:\Qt\4.8.4\mkspecs\win32-msvc2010\qmake.conf and change QMAKE_CFLAGS_RELEASE according to the page ?
  • Change PATH variable and add C:\Qt\4.8.4\bin.
  • Open Visual Studio command prompt and
cd C:\Qt\4.8.4
configure -platform win32-msvc2010 -static -release
nmake sub-src

My experience based on Qt 5.0.2

  • read ReadME file to download Perl, Python and Ruby. Make sure the executable path in in PATH env variable.
  • Download/Install Windows SDK 7.1 (for Windows 7) or 8 (for Windows 8).
  • OpenGL (NOT optional): DirectX SDK The 6/7/2010 version is about 572MB. This will be installed to C:\Program Files (x86)\Microsoft DirectX SDK(June 2010) directory. (The precompiled Qt is built against ANGLE which provides OpenGL ES 2.0 support. ANGLE allows Windows users to run OpenGL ES 2.0 content by ttranslating OpenGL ES 2.0 API calls to DirectX 9 API calls)
  • modify mkspecs by searching qmake.conf. It was found in C:\Qt\qt-everwhere-opensource-src-5.0.2\qtbase\mkspecs\win32-msvc2010
  • configure -static -release -platform win32-msvc2010 -opengl desktop

Qt Creator

  • Multiple version of Qt library
  • Keyboard shortcuts:
    • Ctrl + Click the symbol - move to the definition or the declaration of a symbol.
    • Click a symbol + Right click + Follow the symbol under cursor - move to the definition
  • The default build directory is parallel to the folder of source code which is a pain if there is a same project name. A better default build directory should be under the source code folder. To change the default setting, go to Tools -> Options -> Build and Run -> Remove "../" from the Default build directory value "../build-%{CurrentProject:Name}-%{CurrentKit:FileSystemName}-%{CurrentBuild:Name}". The project name is determined by Qt project file XXXX.pro.

Qt Tutorial

Simple Test

To quickly test whether the Qt was built successfully, we can 

cd c:\Qt
mkdir example
cd example
notepad test.cpp
set PATH=%PATH%;C:\QT\4.8.4\bin
qmake -project
qmake
nmake

If everything went well, we will obtain the executable file under release folder. That is, we can run the executable file by 

release\example.exe

Qt-Apps.org

http://qt-apps.org/ is a good source to find open source projects based on Qt.

Graphics

Scientific

Qt Widget

C++ basics

See C++ tutorial.

  • Use dot (.) to refer to any public member of a class.
  • Use the arrow operator (->) to refer to a member of an object pointed by a pointer. The label below is a pointer rather than an object but *label is an object.
QLabel *label = new QLabel("ABCDE");
label->show();
// (*label).show();
  • Use the operator of scope (::) to set a definition of a class's member function or call a function from some class. For example,
QObject::connect();

means to use connect() function from QObject class.

  • The this pointer passed on to the EditDialog sets the parent of the dlg to the list dialog.
EditDialog dlg( this );

Here explains: The keyword this identifies a special type of pointer. Suppose that you create an object named x of class A, and class A has a nonstatic member function f(). If you call the function x.f(), the keyword this in the body of f() stores the address of x..

Qt Basic

  • To run Qt from command line, I use
# Open command prompt from Visual Studio 2010
set PATH=C:\Qt\Qt5.0.2\5.0.2\msvc2010_opengl\bin;%PATH%

Now we can build the project by for example 

cd C:\Qt\FQD\Chapter01\plain-cpp
qmake -project
qmake
nmake

The executable will be located under release subfolder.

Qt Tricks

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