Hi
I have spent hours reading up on this subject and it's done my head in - please help
I am accessing data from a remote sensor via TCP socket - it's all working fine until I get to intertpret the data.
The incoming data is defined by the manufacturer as
typedef struct
{
WORD SyncHeader;
WORD SyncID;
DWORD UnitID;
} SyncStruct;
SyncHeader is always 0xCAC8
SyncID is a message sequence number
UnitID is the device identification number
How do I access the data via VB.NET? Specifically I want the UnitID as an integer
Many thanks for your help
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In other words, will something like this work out for you.
Dim unitID AS UInt32 = SyncStruct.UnitID
You will have to adjust for how the SyncStruct actually shows up in your code. You indicated you are receiving data fine, just need to interpret so would be dependent on how the data is coming across to you if that makes sense.
Ok, so you have the four HEX values...
If you have the values in order, meaning byte 4 is the last HEX value if value written out like this:
0xCAC81112
You would write this as follows:
Byte1 * 16777216 '256^3
Byte2 * 65536 '256^2
Byte3 * 256 '256^1
Byte4 * 1 '256^0
Then you would sum all those up to end up with an integer value.
The HEX from above that corresponds to unit ID should be 17030605. The decimal value of this is 386074117. This is what my code should produce if you put 17 in unitIDParts(0) ... and 05 in unitIDParts(3).
Not sure how to arrive at your answer, but maybe this will help -- shows how to go from String to HEX then you can use the above to go from HEX to decimal.
http://crossedlogic.blogsp
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by: mwvisa1Posted on 2008-10-22 at 18:01:37ID: 22782578
If I am not mistaken the DWORD is an unsigned Integer anyway, so UInt32 as datatype.