Method StartMerging

Explorer++/Explorer++/MergeFilesDialog.cpp:534–597

}

void MergeFiles::StartMerging()
{
	LARGE_INTEGER lMergeFileSize;
	int nFilesMerged = 1;
	bool bStop = false;

	HANDLE hOutputFile = CreateFile(m_strOutputFilename.c_str(), GENERIC_WRITE, 0, nullptr,
		CREATE_NEW, FILE_ATTRIBUTE_NORMAL, nullptr);

	if (hOutputFile == INVALID_HANDLE_VALUE)
	{
		PostMessage(m_hDlg, NMergeFilesDialog::WM_APP_OUTPUTFILEINVALID, 0, 0);
		return;
	}

	PostMessage(m_hDlg, NMergeFilesDialog::WM_APP_SETTOTALMERGECOUNT,
		static_cast<WPARAM>(m_FullFilenameList.size()), 0);

	for (const auto &strFullFilename : m_FullFilenameList)
	{
		if (bStop)
		{
			break;
		}

		HANDLE hInputFile = CreateFile(strFullFilename.c_str(), GENERIC_READ, FILE_SHARE_READ,
			nullptr, OPEN_EXISTING, 0, nullptr);

		if (hInputFile != INVALID_HANDLE_VALUE)
		{
			GetFileSizeEx(hInputFile, &lMergeFileSize);

			if (lMergeFileSize.QuadPart != 0)
			{
				auto buffer = std::make_unique<char[]>(lMergeFileSize.LowPart);

				DWORD dwNumberOfBytesRead;
				ReadFile(hInputFile, reinterpret_cast<LPVOID>(buffer.get()),
					static_cast<DWORD>(lMergeFileSize.LowPart), &dwNumberOfBytesRead, nullptr);

				DWORD dwNumberOfBytesWritten;
				WriteFile(hOutputFile, reinterpret_cast<LPCVOID>(buffer.get()), dwNumberOfBytesRead,
					&dwNumberOfBytesWritten, nullptr);
			}

			CloseHandle(hInputFile);

			PostMessage(m_hDlg, NMergeFilesDialog::WM_APP_SETCURRENTMERGECOUNT, nFilesMerged, 0);

			nFilesMerged++;

			EnterCriticalSection(&m_csStop);
			if (m_bstopMerging)
			{
				bStop = true;
			}
			LeaveCriticalSection(&m_csStop);
		}