[C++] how to write simple debugger

bool dwResult;
	STARTUPINFO sinfo;
	DEBUG_EVENT DebugEvent;
	


	memset(&sinfo, 0, sizeof(sinfo));
	dwResult = CreateProcess("MainWindow.exe", 0, 0, 0, false, DEBUG_PROCESS|DEBUG_ONLY_THIS_PROCESS, 0, 0, &sinfo, &pinfo);
	if (dwResult)
	{
		while (dwResult)
		{
			WaitForDebugEvent(&DebugEvent, INFINITE);
			DWORD EventCode = DebugEvent.dwDebugEventCode;
			DWORD ExceptionCode = DebugEvent.u.Exception.ExceptionRecord.ExceptionCode;
			switch (EventCode)
			{
			case EXIT_PROCESS_DEBUG_EVENT:
				{
					dwResult = false;
					continue;
				};
			case CREATE_PROCESS_DEBUG_EVENT:
				{
				HANDLE Thread = OpenThread(THREAD_ALL_ACCESS, false, DebugEvent.dwThreadId);
				SetHWBP(Thread, 0x00E5254C, HWBP_EXECUTE, HWBP_BYTE, 0);	// to sniff serial
						
					
					CloseHandle(Thread);
				};
				
			case EXCEPTION_DEBUG_EVENT:
				{
					if (EXCEPTION_SINGLE_STEP == ExceptionCode)
					{
						HANDLE hThread = OpenThread(THREAD_ALL_ACCESS, false, DebugEvent.dwThreadId);
						if (hThread)
						{
							CONTEXT context = {CONTEXT_ALL|CONTEXT_DEBUG_REGISTERS|CONTEXT_CONTROL};
							if (GetThreadContext(hThread, &context))
							{
								if ((context.Dr6 & (1 << 0)))	
								{
									DoSomething(&context); //execute after doing the HWBP
									RemoveHWBP(hThread, 0);
								}
								
							};
							CloseHandle(hThread);
						};
					};
				};
			};
			dwResult = ContinueDebugEvent(DebugEvent.dwProcessId, DebugEvent.dwThreadId, DBG_CONTINUE);
		};
		CloseHandle(pinfo.hProcess);
		CloseHandle(pinfo.hThread);
	};
	//system("pause");
	return false;