Serial Port Communication on 64 Bit Platform

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MFC

VisualC++

Hello Everyone,

In my app, I need to detect the device connected to PC via Serial port. In my code, I am checking for all communication port available on PC at 8 different Baudrates. Here is the code below.

HANDLE  hComHandle;
char	szBaudRate[][7] = {"9600","38400", "115200", "57600", 
			   "19200", "4800", "2400", "1200"};
char	cCommand[][3] = {"k" ,"~k"}; 
char	SerialNumberCommand[][4] = {"Ks" ,"~Ks"};
char	cProduct [ ][10] = {"Kproduct", "~Kproduct"} ;
int 	nPortNum;
int 	nTmp;
int     nControlChar;
WCHAR 	szPortName[10];
char 	cReadBuffer;
char	cReadModel[20] = {"Apache"};
char 	cReadSerialNumber [ 22 ];
DWORD 	lpNumberOfBytesWritten = 0;
DWORD 	lpNumberOfBytesRead = 0;
int     nSerialPortPrinter = 0;
int     nPortNumber = 0;
int     nCounter = 0;
int  	nFlag = 0;


DCB     dcbConfig;
COMMTIMEOUTS commTimeout;


for (nPortNum = 0; nPortNum < m_nSerialPorts; nPortNum++ )
{
    MultiByteToWideChar (CP_ACP, 0, cPortNames [nPortNum], 
                         sizeof(cPortNames[nPortNum]),
                         szPortName, sizeof (cPortNames [nPortNum]));
				
    for ( nTmp = 0; nTmp < 8; nTmp++ )
    {
	hComHandle = CreateFileW ((LPCWSTR)szPortName,
                                   GENERIC_READ | GENERIC_WRITE,
                                   0,                  /* Shared Mode */
                                   NULL,               /* Security */
			   	   OPEN_EXISTING,
			   	   FILE_FLAG_OVERLAPPED,
                                   NULL);
	if ( hComHandle == INVALID_HANDLE_VALUE)
	{
	    break;
	}
			
	if(!SetupComm(hComHandle, 1024, 1024))
	{
	    continue;
	}
	
	if(GetCommState(hComHandle, &dcbConfig))
	{
	    dcbConfig.BaudRate = (DWORD)atoi (szBaudRate [ nTmp ]);
	    dcbConfig.ByteSize = 8;
	    dcbConfig.Parity = NOPARITY;
	    dcbConfig.StopBits = 0;
	    dcbConfig.fBinary = TRUE;
	    dcbConfig.fParity = TRUE;
	}

	else
	    continue;

	if(!SetCommState(hComHandle, &dcbConfig))
	    continue;
	
        if(GetCommTimeouts(hComHandle, &commTimeout))
	{
	    commTimeout.ReadIntervalTimeout = 50;
	    commTimeout.ReadTotalTimeoutConstant = 50;
	    commTimeout.ReadTotalTimeoutMultiplier = 0;
	    commTimeout.WriteTotalTimeoutConstant = 50;
	    commTimeout.WriteTotalTimeoutMultiplier = 0;
	}

	else
	    continue;

	if(!SetCommTimeouts(hComHandle, &commTimeout))
	    continue;

	for (nControlChar = 0; nControlChar < 2; nControlChar++)
	{
	    Sleep ( 2 );
	    WriteFile (hComHandle, cCommand [nControlChar], 
                       2, &lpNumberOfBytesWritten, NULL );
	    Sleep ( 5 ); 
	    ReadFile (hComHandle, &cReadBuffer, 1, &lpNumberOfBytesRead, NULL);
	    
            if (lpNumberOfBytesRead > 0 && cReadBuffer == 'Y' )
	    {
                nFlag = 1;
            }
        }
   }
}

This code works smoothly on 32 Bit Platforms but not on 64 Bit platform. Functions such as SetupComm(),GetCommState(), SetCommState(), SetCommTimeOutS() fails.