/*****************************************************************************
*
* acCanRead
*
* Purpose:
* Read can message.
*
*
* Arguments:
* msgRead - managed buffer for read
* nReadCount - msg number that unmanaged buffer can preserve
* pulNumberofRead - real msgs have read
* ov - synchronization event
* Returns:
* =0 SUCCESS; or <0 failure
*
*****************************************************************************/
public int acCanRead(AdvCan.canmsg_t[] msgRead, uint nReadCount, ref uint pulNumberofRead)
{
bool flag;
int nRet;
uint i;
if (nReadCount > MaxReadMsgNumber)
{
return(OPERATION_ERROR);
}
pulNumberofRead = 0;
flag = AdvCan.ReadFile(hDevice, orgReadBuf, nReadCount, ref pulNumberofRead, 0); //Read frame
if (flag)
{
if (pulNumberofRead == 0)
{
nRet = TIME_OUT;
}
else
{
for (i = 0; i < pulNumberofRead; i++)
{
msgRead[i] = (AdvCan.canmsg_t)(Marshal.PtrToStructure(new IntPtr(orgReadBuf.ToInt32() + AdvCan.CAN_MSG_LENGTH * i), typeof(AdvCan.canmsg_t)));
}
nRet = SUCCESS;
}
}
else
{
nRet = OPERATION_ERROR; //Package receiving error
}
return(nRet);
}
/*****************************************************************************
*
* acCanRead
*
* Purpose:
* Read can message.
*
*
* Arguments:
* msgRead - managed buffer for read
* nReadCount - msg number that unmanaged buffer can preserve
* pulNumberofRead - real msgs have read
*
* Returns:
* =0 SUCCESS; or <0 failure
*
*****************************************************************************/
public int acCanRead(AdvCan.canmsg_t[] msgRead, uint nReadCount, ref uint pulNumberofRead)
{
bool flag;
int nRet;
uint i;
if (nReadCount > MaxReadMsgNumber)
{
nReadCount = MaxReadMsgNumber;
}
pulNumberofRead = 0;
flag = AdvCan.ReadFile(hDevice, orgReadBuf, nReadCount, out pulNumberofRead, this.rxOvr.memPtr);
if (flag)
{
if (pulNumberofRead == 0)
{
nRet = TIME_OUT;
}
else
{
for (i = 0; i < pulNumberofRead; i++)
{
if (OS_TYPE == 8)
{
msgRead[i] = (AdvCan.canmsg_t)(Marshal.PtrToStructure(new IntPtr(orgReadBuf.ToInt64() + AdvCan.CAN_MSG_LENGTH * i), typeof(AdvCan.canmsg_t)));
}
else
{
msgRead[i] = (AdvCan.canmsg_t)(Marshal.PtrToStructure(new IntPtr(orgReadBuf.ToInt32() + AdvCan.CAN_MSG_LENGTH * i), typeof(AdvCan.canmsg_t)));
}
}
nRet = SUCCESS;
}
}
else
{
if (AdvCan.GetOverlappedResult(hDevice, this.rxOvr.memPtr, out pulNumberofRead, true))
{
if (pulNumberofRead == 0)
{
nRet = TIME_OUT; //Package receiving timeout
}
else
{
for (i = 0; i < pulNumberofRead; i++)
{
if (OS_TYPE == 8)
{
msgRead[i] = (AdvCan.canmsg_t)(Marshal.PtrToStructure(new IntPtr(orgReadBuf.ToInt64() + AdvCan.CAN_MSG_LENGTH * i), typeof(AdvCan.canmsg_t)));
}
else
{
msgRead[i] = (AdvCan.canmsg_t)(Marshal.PtrToStructure(new IntPtr(orgReadBuf.ToInt32() + AdvCan.CAN_MSG_LENGTH * i), typeof(AdvCan.canmsg_t)));
}
}
nRet = SUCCESS;
}
}
else
{
nRet = OPERATION_ERROR; //Package receiving error
}
}
return(nRet);
}
