internal void GenerateRequests()
{
int rSize = 0;
_readRequest = LogixServices.BuildLogixReadDataRequest(_address, _elements, out rSize);
_writeRequest = LogixServices.BuildLogixWriteDataRequest(_address, _dataType, _elements, new byte[] { });
}
private void DistributeWriteRequest(PacketMap pm, byte[] requestData, int alignment)
{
try
{
//Ok, the request may have to be broken up into multiple requests...
if (requestData.Length > MAX_MSR_SIZE)
{
//This will have to be broken up... the overhead of an MSR packet is 12 bytes, so
//that means we can only fit up to MAX_MSR_SIZE - 12 bytes into a single packet.
//We need to figure out how much data we can stuff into one packet, then make
//multiple ones based on that...
//The first packet should always be the maximum size we can fit into one request...
WriteDataServiceRequest fragReq = LogixServices.BuildFragmentedWriteRequest(
_tags[pm.TagIndex].Address, _tags[pm.TagIndex].DataType, _tags[pm.TagIndex].Elements,
0, null, _tags[pm.TagIndex].StructHandle);
int maxSize = MAX_MSR_SIZE - 12 - fragReq.Size;
int alignedSize = maxSize - (maxSize % alignment);
int remainingSize = requestData.Length;
uint offset = 0;
while (remainingSize > 0)
{
//We can fit up to alignedSize bytes in the array...
byte[] temp;
if (remainingSize < alignedSize)
{
temp = new byte[remainingSize];
remainingSize = 0;
}
else
{
temp = new byte[alignedSize];
remainingSize -= alignedSize;
}
Buffer.BlockCopy(requestData, (int)offset, temp, 0, temp.Length);
fragReq = LogixServices.BuildFragmentedWriteRequest(_tags[pm.TagIndex].Address,
_tags[pm.TagIndex].DataType, _tags[pm.TagIndex].Elements, offset, temp,
_tags[pm.TagIndex].StructHandle);
offset += (uint)temp.Length;
FindWritePacketOrCreate(pm, fragReq);
}
}
else
{
//We can fit it into a single packet, we just need to find
//one
WriteDataServiceRequest request = LogixServices.BuildLogixWriteDataRequest(
_tags[pm.TagIndex].Address, _tags[pm.TagIndex].DataType, _tags[pm.TagIndex].Elements,
requestData, _tags[pm.TagIndex].StructHandle);
FindWritePacketOrCreate(pm, request);
}
}
catch (Exception ex)
{
_logger.LogError("LogixTagGroup DistributeWriteRequest: " + ex.Message + " " + ex.StackTrace);
}
}
