this is Artikash/Textractor extension for receive text in threads to clipboard

Extension.cpp

#include "Extension.h"
#include <functional>
#include <thread>
#include <mutex>

#include <unordered_set>

#include <QMainWindow>
#include <QLayout>
#include <QPushButton>
#include <QListWidget>
#include <QInputDialog>
#include <QKeyEvent>
#include <QTimer>

std::mutex m;
std::unordered_set<int64_t> linkedTextHandles;


struct : QMainWindow
{
	void launch()
	{
		auto centralWidget = new QWidget(this);
		auto layout = new QHBoxLayout(centralWidget);
		auto linkList = new QListWidget(centralWidget);
		auto addLink = new QPushButton("Link", centralWidget);
		layout->addWidget(linkList);
		layout->addWidget(addLink);

		connect(addLink, &QPushButton::clicked, [=]
			{
				bool ok1, ok2;
				int from = QInputDialog::getText(this, "Merge From", "0x", QLineEdit::Normal, "", &ok1, Qt::WindowCloseButtonHint).toInt(&ok2, 16);
				if (ok1 && ok2)
				{
					std::lock_guard<std::mutex> lock(m);
					linkedTextHandles.insert(from);
					linkList->addItem(QString::number(from, 16));
				}
			});

		Unlink = [=]
		{
			if (linkList->currentItem())
			{
				QString link = linkList->currentItem()->text();
				linkList->takeItem(linkList->currentRow());
				std::lock_guard<std::mutex> lock(m);
				linkedTextHandles.erase(link.toInt(nullptr, 16));
			}
		};

		setCentralWidget(centralWidget);
		setWindowTitle("MergeThreadToClipboard");
		show();
	}



	void keyPressEvent(QKeyEvent* event) override
	{
		if (event->key() == Qt::Key_Delete) Unlink();
	}

	std::function<void()> Unlink;

}*window = nullptr;

BOOL WINAPI DllMain(HMODULE hModule, DWORD ul_reason_for_call, LPVOID lpReserved)
{
	switch (ul_reason_for_call)
	{
	case DLL_PROCESS_ATTACH:
		QTimer::singleShot(0, []
			{
				std::lock_guard<std::mutex> lock(m);
				(window = new std::remove_pointer_t<decltype(window)>)->launch();
			});
		break;
	case DLL_PROCESS_DETACH:
		if (lpReserved == NULL) // https://blogs.msdn.microsoft.com/oldnewthing/20120105-00/?p=8683
		{
			std::lock_guard<std::mutex> lock(m);
			delete window;
			window = nullptr;
		}
		break;
	}
	return TRUE;
}

/**
	* Param sentence: sentence received by Textractor (UTF-16).
	* Param sentenceInfo: contains miscellaneous info about the sentence (see README).
	* Return value: whether the sentence was modified.
	* Textractor will display the sentence after all extensions have had a chance to process and/or modify it.
	* THIS FUNCTION MAY BE RUN SEVERAL TIMES CONCURRENTLY: PLEASE ENSURE THAT IT IS THREAD SAFE!
*/
bool ProcessSentence(std::wstring& sentence, SentenceInfo sentenceInfo)
{
	int64_t textHandle = sentenceInfo["text handle"];

	for (int64_t linkedHandle : linkedTextHandles) {
		if (textHandle == linkedHandle) {
			HGLOBAL hMem = GlobalAlloc(GMEM_MOVEABLE, (sentence.size() + 2) * sizeof(wchar_t));
			memcpy(GlobalLock(hMem), sentence.c_str(), (sentence.size() + 2) * sizeof(wchar_t));
			GlobalUnlock(hMem);
			OpenClipboard(0);
			EmptyClipboard();
			SetClipboardData(CF_UNICODETEXT, hMem);
			CloseClipboard();
		}
	}
	return false;
}

i think it not need anymore. you should use build-in Thread Linker Extentions

i think this extension didn't help you. this extension solve only Artikash/Textractor#155
if it create hook every new dialog it dose not help. because