SendMessage / PostMessage speed test

MessageSpeeedTestDlg.cpp

UINT __cdecl TestThread(LPVOID pData)
{
	CMessageSpeedTestDlg* p = static_cast<CMessageSpeedTestDlg*>(pData);
	QueryPerformanceCounter(&p->m_Begin);
	p->SendMessage(WM_USER_COMPLETE);
	return 0;
}


void CMessageSpeedTestDlg::OnBnClickedButtonStart()
{
	QueryPerformanceFrequency(&m_Freq);
	m_Count = 0;
	m_Sum = 0;
	CString buffer;
	m_CtrlEditTarget.GetWindowText(buffer);
	m_Target = _ttoi(buffer);
	AfxBeginThread(TestThread, this);
}

LRESULT CMessageSpeedTestDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
{
	float time;
	CString buff;
	switch (message) {
	case WM_USER_COMPLETE:
		QueryPerformanceCounter(&m_End);
		m_Sum += m_End.QuadPart - m_Begin.QuadPart;
		time = static_cast<float>(m_Sum) / m_Freq.QuadPart;

		buff.Format(_T("%d"), m_Count);
		m_CtrlEditCount.SetWindowText(buff);
		buff.Format(_T("%f"), time);
		m_CtrlEditTime.SetWindowText(buff);
		buff.Format(_T("%f"), time * 1000000 / m_Count);
		m_CtrlEditAverage.SetWindowText(buff);

		if (m_Count < m_Target) {
			m_Count++;
			AfxBeginThread(TestThread, this);
		}
		break;
	default:
		break;
	}

	return CDialogEx::WindowProc(message, wParam, lParam);
}