如何为非Qt应用程序创建Qt共享库 [英] How to create a Qt shared library for a non-Qt application

问题描述

我开发了一个具有Qt共享库和Qt应用程序的应用程序。 Qt共享库导出一个单一的类，其中有很少的信号。我已经使用了Q_DECL_EXPORT / Q_DECL_IMPORT宏。现在，dll和应用程序之间的通信是通过Qt信号和插槽，并且需要使用QObject开发应用程序。

现在我被要求制作Qt共享库作为一个理想的DLL，客户端应用程序不依赖于Qt框架。

我看到以下帖子，但在非Qt应用程序中使用基于Qt的DLL ，但不确定是否是最佳方法。

有些人可以启发我有可能选择开发用于非Qt应用程序的Qt共享库。

解决方案

你可以在库中的新线程中创建 QCoreApplication 的实例。您应该检查它只创建一个实例，这是因为每个Qt应用程序应该只包含一个 QCoreApplication 。

所以你的图书馆可以像：

  class Q_DECL_EXPORT SharedLibrary：public QObject 
 {
 Q_OBJECT 
 public：
 SharedLibrary（）; 
 
私人插槽：
 
 void onStarted（）; 
 
 private：
 static int argc = 1; 
 static char * argv [] = {SharedLibrary，NULL}; 
 static QCoreApplication * app = NULL; 
 static QThread * thread = NULL; 
}; 
 
 
 SharedLibrary :: SharedLibrary（）
 {
 if（thread == NULL）
 {
 thread = new QThread（）; 
 connect（thread，SIGNAL（started（）），this，SLOT（onStarted（）），Qt :: DirectConnection）; 
 thread-> start（）; 
} 
} 
 SharedLibrary :: onStarted（）
 {
 if（QCoreApplication :: instance（）== NULL）
 {
 app = new QCoreApplication（argc，argv）; 
 app-> exec（）; 
} 
} 
  

这样你就可以使用你的Qt共享库非Qt应用程序。

I have developed an application that has Qt shared library and Qt application. Qt shared library exports a single class with few signals in it. I have made use of Q_DECL_EXPORT / Q_DECL_IMPORT macros for this. Right now the communication between the dll and application is through Qt signals and slots and that needs the application to be developed using QObject.

Now I was asked to make Qt shared library as an ideal DLL where Client application doesn't depend on Qt framework.

I saw the following post but Using a Qt-based DLL in a non-Qt application but not sure if that is the best approach.

Could some one please enlighten me with possible options to develop Qt shared library to be used in a non-Qt application.

解决方案

You can create the instance of the QCoreApplication in a new thread in the library. You should check to create only one instance of it, That's because each Qt application should contain only one QCoreApplication.

So your library can be like :

class Q_DECL_EXPORT SharedLibrary :public QObject    
{
Q_OBJECT
public:
    SharedLibrary();

private slots:

    void onStarted();

private:
    static int argc = 1;
    static char * argv[] = {"SharedLibrary", NULL};
    static QCoreApplication * app = NULL;
    static QThread * thread = NULL;
};


SharedLibrary::SharedLibrary()
{
    if (thread == NULL)
    {
        thread = new QThread();
        connect(thread, SIGNAL(started()), this, SLOT(onStarted()), Qt::DirectConnection);
        thread->start();
    }
}
SharedLibrary::onStarted()
{
   if (QCoreApplication::instance() == NULL)
   {
       app = new QCoreApplication(argc, argv);
       app->exec();
   }
}  

This way you can use your Qt shared library even in non Qt applications.

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