How to embed an icon in a Qt application

最新推荐文章于 2025-05-10 12:18:43 发布

Jared_LAU

最新推荐文章于 2025-05-10 12:18:43 发布

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本文将演示如何在Qt应用中嵌入外部文件，如图标，通过创建Qt资源集合文件并引用实现资源的高效管理和应用。

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This approach holds for any type of an external file that needs to be embedded in an executable, such as an image (icon), a text file containing help etc. The embedding is accomplished by creating a Qt resource collection file *.qrc that lists the files that will become the part of the application source tree.

Qt4 or Qt5 compatible

qtresourceexample/mainwindow.h
qtresourceexample/mainwindow.cpp
qtresourceexample/main.cpp
qtresourceexample/qtresourceexample.qrc
qtresourceexample/icons/alignLeft.png
qtresourceexample/qtresourceexample.pro (Qt 4 compatible)
qtresourceexample/qtresourceexample.pro (Qt 5 compatible)

I am going to demonstrate the problem on an icon alignLeft.png that needs to be embedded in an application. To achieve the embedding we need to perform the following steps in Qt Creator:

In the project folder create a folder 'icons'. Place 'alignLeft.png' into the folder 'icons'.
To create a resource file: Right-click on the highlighted project -> Add New -> Qt -> Qt Resource file. Name the resource file 'qtresourceexample.qrc'.
To edit the resource file: Right-click on qtresourceexample.qrc -> Open With -> Plain Text Editor. Enter the following lines into the resource file:
```
<!DOCTYPE RCC><RCC version="1.0">
 <qresource>
     <file>icons/alignLeft.png</file>
 </qresource>
 </RCC>
```

Finally, check whether the resource file appeared in the *.pro file.

SOURCES += \
    main.cpp \
    mainwindow.cpp

HEADERS += \
    mainwindow.h

RESOURCES += \
    qtresourceexample.qrc

In the code we refer to the icon in the following way:

alignLeftAction->setIcon(QIcon(":/icons/alignLeft.png"));