Not getting proper response in slot connected with QNetworkAccessManager second time

[d_stranz]

QCoreApplication QCoreApplication(argc, argv);

I hope this is just a bad cut and paste job, because I have no idea what you intend this line of code to do.

[BB_Shi]

I am not finding any way to create thread only once and send request in already running thread because the function which is calling pthread_create needs to be called by below function. Calling of this function can't be handled. This function is called every time whenever a button is clicked from javascript application.

string TemplateJS::InvokeMethod(const string& command) {
	// command appears with parameters following after a space
	int index = command.find_first_of(" ");
	std::string strCommand = command.substr(0, index);
	std::string arg = command.substr(index + 1, command.length());
	params = arg;
	if (strCommand == "request") {
		StartThread();
 
		strCommand.append(";");
		strCommand.append(command);
		return strCommand;
	}
 
	return "Unknown C++ method";
}

string TemplateJS::InvokeMethod(const string& command) {
	// command appears with parameters following after a space
	int index = command.find_first_of(" ");
	std::string strCommand = command.substr(0, index);
	std::string arg = command.substr(index + 1, command.length());
	params = arg;
	if (strCommand == "request") {
		StartThread();

		strCommand.append(";");
		strCommand.append(command);
		return strCommand;
	}

	return "Unknown C++ method";
}

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if I call m_signalHandler->doNetworkRequest(); two times in SignalThread then it's working fine and returns good response. But if I call StartThread() two times in above function, app exits.

---

Added after 10 minutes:

I hope this is just a bad cut and paste job, because I have no idea what you intend this line of code to do.

I have changed it to

QCoreApplication app(argc, argv);

QCoreApplication app(argc, argv);

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Also according to document since exec() is static function of QCoreApplication so it can be called like: QCoreApplication::exec();

Please correct me if something is wrong. As I am new to this.

[anda_skoa]

I am not finding any way to create thread only once and send request in already running thread because the function which is calling pthread_create needs to be called by below function.

You would of course only call the setup function once.

Once the thread and its event loop are running, you have a couple of options to send the requests:
- QCoreApplication:ostEvent and a custom event sent to your worker object.
- Or letting the worker object block on a semaphore or wait condition and doing traditional cross-thread data handover.
- Might even work to do QMetaObject::invokeMethod on the worker object (using a Qt::QueuedConnection type)

Cheers,
_