Qt中MFC等价物的SendMessage [英] SendMessage of MFC equivalent in Qt

问题描述

在 QT 中移植 VS2010 项目.

Porting VS2010 project in QT .

我想，我之前的帖子不是很清楚，所以我在这里再次解释一下.

I guess, I wasn’t very clear with my earlier post so here I am explaining it again.

问题是.. 我有很多子 Qdialog 窗口，当用户单击时会生成一些消息.我希望这些消息出现在我的主应用程序窗口的 QTablewidget 上.
现在正如一些成员所建议的，我应该看看 VS2010 中的事情是如何完成的，并尝试在 QT 中复制相同的内容.所以这是我的设计.. 请让我知道您的建议/批评.

The issue is .. I have lots of sub Qdialog windows which when user click generates some messages. I want those messages to be on my QTablewidget of my main Application window.
Now As suggested by some members that I should look how things have done in VS2010 and try to replicate same in QT . So Here is my design .. Please let me know your suggestion /criticism.

1) vs 2010 -> 在主应用程序窗口中

1) vs 2010 -> On Main application window in

MESSAGE_MAP

我们有

ON_MESSAGE( WM_NOTICE, OnAddMessage )

• 其中 WM_NOTICE = WM_USER+1；

在 QT 中做同样的事情我需要 signal 和 slot .所以像

doing same in QT I need signal and slot . so Something like

connect( sender , SIGNAL(QtSingleApplication::messageReceived ( const QString &message )  ) , this , SLOT ( on_add_message( const QString & message ) );

现在我应该用什么替换这里

now what should I replace here with

• ‘发件人’?，在我的情况下，谁将是发件人?
• SIGNAL (QtSingleApplication::messageReceived) 对吗?
• 插槽——这里没有问题..我可以实现我在其中的代码将消息按排序顺序放置在 QTable widegt 中.

2) 现在，如果我查看使用 VC++ 开发的现有项目的内部 QDialog windows 源代码他们有类似的东西

2) Now if I look into inner QDialog windows source code of existing project which was developed in VC++ they have something like

void Message_information::add( const SMS& message )
{
//SMS is a  structure  and fields are SYSTEMTIME, Enum , CString
 CCriticalSection critical_section;
CSingleLock   lock( &critical_section, true );
messages_.insert( message ); // where messages_ is an object std::multiset

SendMessage( dialog_->m_hWnd, WM_MULTIBOXMESSAGE, 0, 0 );
}

现在在 Qt 中做同样的事情

Now doing same in Qt

void Message_information::add( const SMS& message )
{
  QMutex mutex;
  mutex.lock();
messages_.insert( message ); // where messages_ is an object std::multiset

//SendMessage( dialog_->m_hWnd, WM_MULTIBOXMESSAGE, 0, 0 );
QtSingleApplication::sendMessage ( // send multiset values here   );

}

1. 我应该在 SendMessage 中添加什么参数?是事实上的发送消息调用的函数是否正确?

这个添加"函数正在其他地方被调用.我知道这听起来与其他问题重复，我已经查看了为我的一些成员提供的链接，但很抱歉我无法掌握太多.—任何建议或批评都可能对我有所帮助.. 非常感谢大家的帮助

this ‘add’ function is being called somewhere else . I know this sounds duplicate of other questions and I have looked into the link provided my some members but I am sorry I couldn’t able to grasp much. — Any suggestion or criticism might help me .. hanks a lot for al the help

推荐答案

在您的情况下，您似乎有多个 QDialog，它们应该向单个 MainApplication 发送内容，对吧?

It appears that in your case you have multiple QDialogs, which should send something to a single MainApplication, right?

有什么特殊原因不能通过直接函数调用来实现吗?如:

Is there a particular reason you cannot do it via direct function call? Such as:

MyMainWindows * pMainWindow;

...

void MyMainWindows::addMessage( const SMS& message )
{
...
}

void Message_information::add( const SMS& message )
{
  QMutex mutex;
  mutex.lock();
  messages_.insert( message ); // where messages_ is an object std::multiset

  pMainWindow->addMessage( messages_ );
  mutex.unlock();
}

这将与直接连接的信号槽具有相同的效果，并且接近 SendMessage 所做的.

This would have the same effect as signal-slot with direct connection, and close to what SendMessage does.

如果有任何特殊原因您不能使用这种结构，请确定它，因为这会影响您应该使用哪种类型的信号/插槽.

If there is any particular reason you cannot use this construction, please identify it as it will make a difference what type of signal/slot you should use.

如果您对这种结构没有问题，但想使用信号槽而不是直接调用，也请告诉我们，因为将其转换为信号槽代码相当容易(只要您的应用正在运行事件循环和代码生成信号继承自 QObject)

If you are fine with this construction but would like to use signals-slots instead of direct calls, also please let us know as it is fairly easy to convert this into signal-slot code (as long as your app is running the event loop and the code generating signals is inherited from QObject)

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