/// <summary>
///
/// </summary>
/// <param name="DBNumber">DB Number</param>
/// <param name="Buffer">Destination buffer</param>
/// <param name="SizeRead">How many bytes were read</param>
/// <returns></returns>
public int DBGet(int DBNumber, byte[] Buffer, IntByRef SizeRead)
{
S7BlockInfo Block = new S7BlockInfo();
// Query the DB Length
LastError = GetAgBlockInfo(S7.Block_DB, DBNumber, Block);
if (LastError == 0)
{
int SizeToRead = Block.MC7Size();
// Checks the room
if (SizeToRead <= Buffer.Length)
{
LastError = ReadArea(S7.S7AreaDB, DBNumber, 0, SizeToRead, Buffer);
if (LastError == 0)
{
SizeRead.Value = SizeToRead;
}
}
else
{
LastError = errS7BufferTooSmall;
}
}
return(LastError);
}
public int GetAgBlockInfo(int BlockType, int BlockNumber, S7BlockInfo Block)
{
int Length;
LastError = 0;
// Block Type
S7_BI[30] = (byte)BlockType;
// Block Number
S7_BI[31] = (byte)((BlockNumber / 10000) + 0x30);
BlockNumber = BlockNumber % 10000;
S7_BI[32] = (byte)((BlockNumber / 1000) + 0x30);
BlockNumber = BlockNumber % 1000;
S7_BI[33] = (byte)((BlockNumber / 100) + 0x30);
BlockNumber = BlockNumber % 100;
S7_BI[34] = (byte)((BlockNumber / 10) + 0x30);
BlockNumber = BlockNumber % 10;
S7_BI[35] = (byte)((BlockNumber / 1) + 0x30);
SendPacket(S7_BI);
if (LastError == 0)
{
Length = RecvIsoPacket();
if (Length > 32) // the minimum expected
{
if ((S7.GetWordAt(PDU, 27) == 0) && (PDU[29] == (byte)0xFF))
{
Block.Update(PDU, 42);
}
else
{
LastError = errS7FunctionError;
}
}
else
{
LastError = errS7InvalidPDU;
}
}
return(LastError);
}
