ReadFile读串口的数据问题.
重叠方式读取数据:
memset(&mOverlapped,0,sizeof(OVERLAPPED));
mOverlapped.hEvent = CreateEvent(NULL,TRUE,FALSE,NULL);
DWORD dwBytesRead = 100;
if(!ReadFile(mhCom, mReadBuf,dwBytesRead,&dwBytesRead,&mOverlapped))
{
if(GetLastError() != ERROR_IO_PENDING)
{
MessageBox("失败!");
return ;
}
}
WaitForSingleObject(mOverlapped.hEvent,INFINITE);
如果硬件发送了50个字接到COM口,是不是WaitForSingleObject就不会返回,
一定要接收满100字接才返回?