WriteFile() 的问题，急急，在线等！！！！

[songxinSQL]

void CSerialInterface::SerialComSend(BYTE lpOutBuffer[])
{
OVERLAPPED m_Write;
memset(&m_Write,0,sizeof(OVERLAPPED));

DWORD dwBytesWrite=8;
COMSTAT ComStat;
DWORD dwError;
BOOL bWriteStat;
ClearCommError(hCom,&dwError,&ComStat);

bWriteStat=WriteFile(hCom,lpOutBuffer,dwBytesWrite,&dwBytesWrite,&m_Write);
if(bWriteStat==0)
{
long int iError=GetLastError();
}
}


void CMyDlg::OnButtonUp()
{
// TODO: Add your control notification handler code here
BYTE upcommand[8]={0xa0,0x01,0x00,0x08,0x00,0x30,0xaf,0x39};

m_vidiconCom.SerialComSend(upcommand);
}


我在OnButtonUp()调用的时候我用GetLastError()返回值是997,那么WriteFile()是什么问题那？高手帮忙解答下，急急！！！

[yanjing_mail]

重叠 I/O 操作在进行中。

[hackwolfoscar]

重叠 I/O 操作在进行中。


需要等待完成

[僵哥]

...
m_Write.hEvent = CreateEvent(NULL, true, true, NULL);bWriteStat=WriteFile(hCom,lpOutBuffer,dwBytesWrite,&dwBytesWrite,&m_Write);
if(bWriteStat==0)
{
long int iError=GetLastError();
if(iError != ERROR_IO_PENDING /*997*/) {
CloseHandle(m_Write.hEvent);
return;
}

}
GetOverlappedResult(hCom, &m_Write, &dwBytesWrite, true);
CloseHandle(m_Write.hEvent);
}