C / C++ / MFC

do
{
	if (eEvent & CSerial::EEventRecv)
	{
		// read until '>'
		DWORD dwBytesRead = 0;
		char szBuffer[10];

		do
		{
			lLastError = serial.Read(szBuffer, sizeof(szBuffer)-1, &dwBytesRead);
                        ASSERT(dwBytesRead < 10);

			if(lLastError != ERROR_SUCCESS)
				return ShowError(serial.GetLastError(), _T("Unable to read from COM-Port"));

			if(dwBytesRead > 0)
			{
				if (szBuffer[dwBytesRead-1] == '>')
					fContinue = false;
			}
			
		} while (dwBytesRead == sizeof(szBuffer)-1);
	}

} while (fContinue);

DWORD dwReadBytes;
char szBuffer[10];

do
{
    Read();
}

do
{
    DWORD dwReadBytes;
    char szBuffer[10] = {0};
    Read();
}

// Get the app's full path
CString strFile;
::GetModuleFileName(NULL, strFile.GetBuffer(MAX_PATH), MAX_PATH);
strFile.ReleaseBuffer();
 
// Create a temporary mutex to check if it's already running
CMutex(FALSE, strFile);
if (::GetLastError() == ERROR_ALREADY_EXISTS)
    return FALSE;  // already running in the same folder
 
// Create a static mutex to prevent others from running
static CMutex mutex(FALSE, strFile);

// Get the app's full path, but with regular slashes
CString strMutex;
::GetModuleFileName(NULL, strMutex.GetBuffer(MAX_PATH), MAX_PATH);
strMutex.ReleaseBuffer();
strMutex.Replace('\\', '/');

// Create a temporary mutex to check if it's already running
static CMutex mutex(FALSE, strMutex);
if (::GetLastError() == ERROR_ALREADY_EXISTS)
    return FALSE;  // already running in the same folder