Hello all,

I have an array of x bytes. I want to process this data somewhere else in my program so I want to use pointers. I want to be able to increment the pointer address in an easy way. I know have the following code:

receivedData : ARRAY [0..MAX_RECEIVE_TCP_SERVER] OF BYTE;

processCommand( ADR(receivedData[6]) );

FUNCTION processCommand : BOOL
VAR_INPUT
dataPtr : POINTER TO BYTE;
END_VAR
VAR
channel: BYTE;
value: UINT;
state: BYTE;
END_VAR

channel := dataPtr^;
dataPtr := dataPtr + 1;
value := dataPtr^;
dataPtr := dataPtr + 1;
value := value + (dataPtr^ * 256);
dataPtr := dataPtr + 1;
state := dataPtr^;

dummyFunction(channel, value, state);

Is there an easier way to increment the pointer address? I would prefer to have something like this, but I don't know if this is possible:
dummyFunction(dataPtr[0]^, dataPtr[1]^ + dataPtr[2]^ *256 , dataPtr[3]^);

Originally created by: scott_cunningham

Instead of defining a pointer to byte, define your pointer as:

dataPtr := POINTER TO ARRAY [0..MAX_RECEIVE_TCP_SERVER] OF BYTE;

Then you can access your data with array indexing like you wish.

Thanks for your reply. Unfortunately, this is not possible (error 4110, '[<index>]</index>' needs array variable).

Other solutions, or is my implementation wrong: dummyFunction(dataPtr[0]^, dataPtr[1]^ + dataPtr[2]^ *256 , dataPtr[3]^);

Originally created by: scott_cunningham

I am not by my computer, but I believe you need to dereference before index: dataPtr^[1].

scott_cunningham hat geschrieben:
I am not by my computer, but I believe you need to dereference before index: dataPtr^[1].

Works! Unbelievable I didn't try that... Thanks very much!

Originally created by: scott_cunningham

If you get tired of dereferencing your pointer, you can use REFERENCE TO instead of POINTER TO. Check the help for more info.