D12上层的死机问题

各位大虾：
    我们用的是D12,我在用ReadFile在跟硬件联调时，经常会出现死机的现象，我该如何把ReadFile在收不到东西时激活（或超时退出），具体的程序该如何写？？Thanx!

调试一下吧，不难的

呵！！！

你用readfile不成功时会返回false，那你就能解决出错问题。但是如果要写的好，建议参考：
BOOLEAN PRODLG::ReadD12EP2(BYTE* pData, int bytes)
{
DWORD dwRead = 0;
DWORD dwTimeout = 20;
OVERLAPPED ovInternal;
memset(&ovInternal, 0, sizeof(OVERLAPPED));
ovInternal.hEvent = CreateEvent(NULL,
TRUE,
FALSE,
NULL);
LPOVERLAPPED lpOverlapped;
lpOverlapped = &ovInternal;
if(!ReadFile(hDevicer, pData, bytes, &dwRead, lpOverlapped))
{
long lLastError = ::GetLastError();
if(lLastError != ERROR_IO_PENDING)
{
switch(::WaitForSingleObject(ovInternal.hEvent, dwTimeout))
{
case WAIT_OBJECT_0:
if(!::GetOverlappedResult(hDevicer,
lpOverlapped,
&dwRead,
TRUE))
{
}
break;
case WAIT_TIMEOUT:
::CancelIo(hDevicer);
default:
break;
}
}
return FALSE;
}
return TRUE;
}