Qt4--创建自定义图标

1、通过Qt Assistant 查看 Qt resource system

原文：The Qt resource system is a platform-independent mechanism for storing binary files in the application&＃39;s executable. This is useful if your application always needs a certain set of files (icons, translation files, etc.) and you don&＃39;t want to run the risk of losing the files.

意思是说，Qt resource system是和平台无关，他用来为应用程序存储二进制文件。如果在运行过程中不想要冒文件丢失的险，这样的文件集就是一个很好的选择。

原文：The resources associated with an application are specified in a .qrc file, an XML-based file format that lists files on the disk and optionally assigns them a resource name that the application must use to access the resource.

Here&＃39;s an example .qrc file:

 DOCTYPE RCC> 
  
     images/copy.png 
     images/cut.png 
     images/new.png 
     images/open.png 
     images/paste.png 
     images/save.png 
  
  


 
     images/copy.png
     images/cut.png
     images/new.png
     images/open.png
     images/paste.png
     images/save.png
 

 这些资源被存放在.qrc文件下，这是一个基于XML格式的文件。

原文：For a resource to be compiled into the binary the .qrc file must be mentioned in the application&＃39;s .pro file so that qmake knows about it. For example:
 

RESOURCES     = application.qrc 

 RESOURCES     = application.qrc需要在.pro文件内加入.qrc文件

如下图是qmake以后生产的文件。也就是程序中可以用如“:/images/copy.png”

原文：

Using Resources in the Application

In the application, resource paths can be used in most places instead of ordinary file system paths. In particular, you can pass a resource path instead of a file name to the QIcon, QImage, or QPixmap constructor:

 cutAct = new QAction(QIcon(":/images/cut.png"), tr("Cu&t"), this); 

cutAct = new QAction(QIcon(":/images/cut.png"), tr("Cu&t"), this);

2、示例
1、在目录下建立images文件夹，在文件夹内放入图片：buttonico.png

2、建立一个Qt resource 文件，取名为images.qrc

3、修改images.qrc文件内容

修改好以后Qt Creator内images.qrc发生变化

4、创建main.cpp

 include  
#include  
 
int main(int argc, char* argv[]) 
{ 
    QApplication app(argc, argv); 
 
    QPushButton* button = new QPushButton(); 
    button->setIcon(QIcon(":/images/buttonico.png")); 
    QObject::connect(button, SIGNAL(clicked()), &app, SLOT(quit())); 
    button->show(); 
    return app.exec(); 
}