Best way to retrieve very long strings from thread pool

Question

Best way to retrieve very long strings from thread pool

Flaviu_ 1,031

I have a MFC SDI app. I have a thread pool in the document class. The threads retrieve very long strings. My question: how can I get those strings from the threads?

I want to avoid save them to HDD files, or inside a database. Any ideas?

RLWA32 49,636 Reputation points

2024-12-05T18:21:38.7233333+00:00

Give us some more detail and context for what you are doing now. It's not clear where strings are currently residing, how they are being retrieved, and how all of this relates to using a threadpool. Is there some reason you're not using string resources?

Flaviu_ 1,031

void CMyDoc::TestThreadPool()
{
//	[[maybe_unused]] auto&& unused = m_tp->submit(&CMyDoc::MyMethod, this);
//	[[maybe_unused]] auto&& unused = m_tp->submit(&CMyDoc::MyMethod, this);
...
}

where

m_tp is:

CMyDoc header

protected:
	std::unique_ptr<task_thread_pool::task_thread_pool> m_tp{};

and MyMethod is:

std::string CMyDoc::MyMethod()
{
	// get strings from an internet server, which can take long time
}

the aim is to get all those strings taken from internet server and process them into main thread ... to parse them into the same thread would complicate too much the thread method.

Flaviu_ 1,031 Reputation points

2024-12-08T10:06:12.8833333+00:00

"You could use a custom windows message."
Please convert it as Answer to be able to mark it as Solved :)
RLWA32 49,636 Reputation points

2024-12-08T11:23:15.8033333+00:00

Please convert it as Answer to be able to mark it as Solved :)

Done. Glad to help. :)

Accepted answer

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RLWA32 49,636 Reputation points

2024-12-05T18:21:38.7233333+00:00

Give us some more detail and context for what you are doing now. It's not clear where strings are currently residing, how they are being retrieved, and how all of this relates to using a threadpool. Is there some reason you're not using string resources?
Flaviu_ 1,031 Reputation points

2024-12-06T12:10:47.8833333+00:00

void CMyDoc::TestThreadPool() { // [[maybe_unused]] auto&& unused = m_tp->submit(&CMyDoc::MyMethod, this); // [[maybe_unused]] auto&& unused = m_tp->submit(&CMyDoc::MyMethod, this); ... }

where

m_tp is:

CMyDoc header

protected: std::unique_ptr<task_thread_pool::task_thread_pool> m_tp{};

and MyMethod is:

std::string CMyDoc::MyMethod() { // get strings from an internet server, which can take long time }

the aim is to get all those strings taken from internet server and process them into main thread ... to parse them into the same thread would complicate too much the thread method.
Flaviu_ 1,031 Reputation points

2024-12-08T10:06:12.8833333+00:00

"You could use a custom windows message."
Please convert it as Answer to be able to mark it as Solved :)
RLWA32 49,636 Reputation points

2024-12-08T11:23:15.8033333+00:00

Please convert it as Answer to be able to mark it as Solved :)

Done. Glad to help. :)

Answer 1

RLWA32 49,636

You could use a custom windows message. The thread pool callback function could post the message to your MFC application's hwnd. The WPARAM could contain the number of characters in the string and the LPARAM could be a pointer to the string. Of course the way that the message handler processes the custom message depends on what the LPARAM points to. A raw pointer to memory allocated by new or malloc? A pointer to a CString object? A pointer to a std::string object? And so forth.

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Best way to retrieve very long strings from thread pool

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