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Code sample two threads updating

Here the object which is required to update the view is of a custom class, Query Result.How will the Action class and the View class communicate? The first Google hit on signal/slots is the Qt documentation on that topic (which should be the primary source even without search engine help) and it does naturally have an example that transports a value through the connection.The results keep on coming until the database polling is complete.

Core Foundation 0x9321aaa6 CFRun Loop Run Specific 390 5 com.apple.A loading gif image, for example, which signifies the ongoing querying, often stalls and freezes.So I want to separate out the entire querying part into a separate thread, and that thread should poll, and update the view (which is in a separate thread, the main one). Here is my pseudocode: execute(); void update View(Query Result &result) //Query Finder code, header file class Query Finder: public QObject //Query Finder code, implementation file Query Finder:: Query Finder(QWidget *w, Query Term& term): f View(w), f Term(term) void Query Finder::execute() void Query Finder::stop() Yes, if your task takes a long time and you don't want to freeze the UI thread you need a second worker thread to do the job, and you need to implement the communication between these two threads using signals and slots.Allocate it on the heap (new QThread()) and save a pointer to it for future use or make it a class member variable. Make them member variables or allocate from the heap, etc.Edit: Not sure why you are trying to move the timer to the thread too.I experimented with them, and I can see that they jolly well accept all sorts of parameters, be standard types or custom objects. As for the subject of this thread, I tried the example 2.1 of this article: I created a separate Thread 0:: Dispatch queue: com.apple.main-thread 0 libsystem_kernel.dylib 0x9a4709cf mach_absolute_time 1 1 com.apple.HIToolbox 0x9bef7957 Get Current Event Time 18 2 com.apple.The class you move To Thread is the one that has the signals/slots and code that you wish to execute in a separate thread. Qt supports all native types, many Qt types, and allows you to register any custom type to the meta object system.How can you say that Qt greatly limits the use of parameters?These two macros are needed to register a custom metatype that can be used for signal/slot parameters. I will usually register my custom types whether or not I am using threads and cross-thread signals/slots.I believe the other beneficial reason to do so is that you can use QVariant for custom types that have been registered, which may come in handy too. First of all, I am very sorry about my statement about signals and slots.

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