帮我看看我写的串口dll，错在什么地方

Question

CSerialDLL::CSerialDLL()
{
m_serialInfo.Receive = 0;
h_Read = 0;
h_Write = 0;
return;
}

CSerialDLL::~CSerialDLL()
{
/*if (m_serialInfo)
{
delete m_serialInfo;
}*/
}

DWORD WINAPI CSerialDLL::ReadFunc(LPVOID para)
{
HANDLE m_hComm;
DWORD Num;
m_hComm = CreateFileA("COM2", GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, 0);
if (m_hComm == INVALID_HANDLE_VALUE)
{
printf("打开COM2失败");
}
COMMTIMEOUTS commtimeouts;
GetCommTimeouts(m_hComm, &commtimeouts);
commtimeouts.ReadIntervalTimeout = MAXDWORD;
commtimeouts.ReadTotalTimeoutConstant = 0;
commtimeouts.ReadTotalTimeoutMultiplier = 0;
SetCommTimeouts(m_hComm, &commtimeouts);
DCB dcb;
GetCommState(m_hComm, &dcb);
dcb.BaudRate = 9600;
dcb.ByteSize = 8;
dcb.StopBits = 1;
SetCommState(m_hComm, &dcb);
ReadFile(m_hComm, &para, 20, &Num, 0);
return 0;
}

DWORD WINAPI CSerialDLL::WriteFunc(LPVOID para)
{
HANDLE m_hComm2;
DWORD Num;
m_hComm2 = CreateFileA("COM2", GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, 0);
if (m_hComm2 == INVALID_HANDLE_VALUE)
{
printf("打开COM2失败");
}
COMMTIMEOUTS commtimeouts;
GetCommTimeouts(m_hComm2, &commtimeouts);
commtimeouts.WriteTotalTimeoutConstant = 0;
commtimeouts.WriteTotalTimeoutMultiplier = 0;
SetCommTimeouts(m_hComm2, &commtimeouts);
DCB dcb;
GetCommState(m_hComm2, &dcb);
dcb.BaudRate = 9600;
dcb.ByteSize = 8;
dcb.StopBits = 1;
SetCommState(m_hComm2, &dcb);
ReadFile(m_hComm2, &para, 20, &Num, 0);
return 0;
}

void CSerialDLL::Read(SerialInfo a)
{
DWORD threadID;
h_Read = CreateThread(NULL, 0, ReadFunc, &a.Receive, 0, &threadID);
}

void CSerialDLL::Write(SerialInfo a)
{
DWORD threadID;
h_Write = CreateThread(NULL, 0, WriteFunc, &a.Send, 0, &threadID);
}

Answer 1

http://blog.csdn.net/humanking7/article/details/48110543