64位平台上的串口通信

问题描述

大家好，



在我的应用程序中，我需要通过串口检测连接到PC的设备。在我的代码中，我正在检查8个不同波特率的PC上可用的所有通信端口。这是下面的代码。

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;
            }
        }
   }
}

此代码在32位平台上运行顺畅但在64位平台上运行不正常。 SetupComm（），GetCommState（），SetCommState（），SetCommTimeOutS（）等函数失败。

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

推荐答案

引用：

此代码在32位平台上运行顺畅，但在64位平台上运行不正常。 SetupComm（），GetCommState（），SetCommState（），SetCommTimeOutS（）等函数失败。

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

这不是一个好的信息。你应该检查你得到的错误代码（即：失败时调用 GetLastError ），如果你愿意，可以在这里报告。



请注意 Windows API 函数失败，您应该始终执行错误检查。

This is not good info. You should check the error codes you are getting (that is: call GetLastError on failure) and, if you wish, report them here.

Please note on Windows API function failure, you should always perform error checking.

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