串口API编程writefile问题

2008-07-11 08:13:30 126 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

heroallen1981 墨衍会员 · AI 创作全网分发关注 + 加入社区

Windows API 串口编程最近一直在研究串口的编程，在这里写下win32 API串口通信编程的一般流程：（1）打开串口：CreateFile函数// get a handle to the port m_hComm = CreateFile("szPort", // communication port string (COMX) GENERIC_READ | GENERIC_WRITE, // read/write types 0, // comm devices must be opened with exc 阅读详情

BOOL CMytest080623Dlg::WriteCom(char *lpBuf,DWORD dwToWrite)
{
DWORD dwWrite;

BOOL fRes;
BOOL tmp;
unsigned long err;
// char BYTE[7] = {"abcdef"};
Wol.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
if(Wol.hEvent == NULL) return FALSE; //create Event Fail
//err = GetLastError();
tmp = WriteFile(hCom,lpBuf,dwToWrite,&dwWrite,&Wol);
if(!tmp)
{
err = GetLastError();
if(GetLastError() != ERROR_IO_PENDING)
fRes = FALSE; //Write File Fail
else
{
if(!GetOverlappedResult(hCom, &Wol, &dwWrite, TRUE))
fRes = FALSE; //overlapped Write File Fail
else
fRes = TRUE;
}
}
else
fRes = TRUE;
CloseHandle(Wol.hEvent);
return fRes;

}

在WriteFile（）使用后使用GetLastError（）得到sys error值为87 即参数不对，但我认为参数是对的。。不知道怎么回事，忘高手指教。。。

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