public TemplateInfo(byte[] templateData, GetStructAttribsReply attribs)
{
MemberInfo = new List <MemberInfo>();
//Ok, this is a little confusing, there's supposed to be a header, but
//it seems that the data returned is not in the format specified in the
//1756-RM005 publication. There is no header data (meaning we can't
//know how many elements are in the template), so we kinda have to
//pick through and cheat... Luckily this data is found in the
//GetStructAttribs reply
//The format of the data returned is:
//[2:Info][2:Type][4:Offset]
//When we reach a byte that is greater than 0x00
int offset = 0;
int lastMember = -1;
int lastOffset = 0;
for (int i = 0; i < attribs.MemberCount; i++)
{
MemberInfo mi = new MemberInfo();
mi.Info = BitConverter.ToUInt16(templateData, offset);
offset += 2;
mi.MemberType = BitConverter.ToUInt16(templateData, offset);
offset += 2;
mi.MemberOffset = BitConverter.ToInt32(templateData, offset);
if (lastMember >= 0)
{
//Compute size for the last member...
int size = mi.MemberOffset - lastOffset;
MemberInfo[lastMember].MemberSize = size;
}
lastOffset = mi.MemberOffset;
lastMember++;
offset += 4;
switch ((CIPType)(mi.MemberType & 0x00FF))
{
case CIPType.BOOL:
mi.LogixType = LogixTypes.Bool;
break;
case CIPType.DINT:
mi.LogixType = LogixTypes.DInt;
break;
case CIPType.INT:
mi.LogixType = LogixTypes.Int;
break;
case CIPType.LINT:
mi.LogixType = LogixTypes.LInt;
break;
case CIPType.REAL:
mi.LogixType = LogixTypes.Real;
break;
case CIPType.SINT:
mi.LogixType = LogixTypes.SInt;
break;
case CIPType.STRUCT:
mi.LogixType = LogixTypes.User_Defined;
break;
default:
mi.LogixType = LogixTypes.Unknown;
break;
}
MemberInfo.Add(mi);
}
//Compute the size for the last member
int lastSize = TagSize - lastOffset;
MemberInfo[MemberInfo.Count - 1].MemberSize = lastSize;
NumberOfMembers = (ushort)MemberInfo.Count;
TemplateHandle = attribs.Handle;
TagSize = attribs.MemorySize;
//And now we have to go through the rest of the data and pick out
//null terminated strings...
int start = offset;
string currentStr = "";
int idx = -1;
for (int i = start; i < templateData.Length; i++)
{
if (templateData[i] == 0x00)
{
if (string.IsNullOrEmpty(currentStr))
{
continue;
}
if (idx == -1)
{
//This is the structure name...
TemplateName = currentStr;
if (TemplateName.Contains(';'))
{
TemplateName = TemplateName.Substring(0, TemplateName.IndexOf(';'));
}
}
else
{
MemberInfo[idx].MemberName = currentStr;
}
currentStr = string.Empty;
idx++;
}
else
{
currentStr += (char)templateData[i];
}
}
}
