can anyone tell me how to do parsing

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i have the information as shown below.
I have to parse the DATA PART that i will get from a machine and fill the values like Rinse mode,status of machine....
I will get data on Com Port,i have to do it in c++.
I have written the code to open the com port and send Data demand(command).
Can anyone help me to suggest how to do the parsing?

Data format
・ All data isASCII character code without checksumand CR.
・ Range ofMachineNumber start from0000 to 9999
・ If there is no top digit at data part, itwill be zero suppression and put space to fill it.
・ Calculate sum total from top till before checksum (１bite unit), then recognize this
complement of 1 as checksum.
・ Finish of format isCR Hexadecimal: OD

Data demand(command)
   CM"      "00"         Checksum       CR
(2 bite)   (2 bite)

Monitor data(response)
"RE"              "00"          MachineNumber    Data part
(2 bite)         (2 bite)         4bite            128 byte

Parameter              Data          byte               Unit              Status
Status of machine       #             1
Rinsemode               #             1
Bypass                  #             1
Dialysate flow         ###            3                      
Treated blood volume  ##.##           5  
W+B conductivity       ##.#           4

Posted 30-Aug-12 0:54am

Tarun Batra

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pasztorpisti 30-Aug-12 8:02am

Bite? That data structure seems to be quite aggressive...

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ChandraRam · Answer 1 · 2012-08-30T01:59:00

Solution 1

Create a structure consisting of all data items in the response, with the correct field sizes. You can then read the response into this structure, and pick out any of its data items.

HTH

Posted 30-Aug-12 1:59am

ChandraRam

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Tarun Batra 30-Aug-12 8:06am

Thanks for the reply sir...i have some doubts please explain them when i will get data how to reach the data part,as u can see in Monitor data(response) we have 6bytes before the data part start.

ChandraRam 30-Aug-12 8:10am

Create your data structure to include the _complete_ response (including the "header" information), even if you do not want to use them further.

So, your structure should start with:
Type - 2 bytes (to store the "RE")
Flag - 2 bytes (not sure what this data is since you do not mention that)
MachineNumber - 2 bytes
Status - 1 byte
....
and so on.

HTH

Tarun Batra 30-Aug-12 8:15am

Sir as all the info i have i have put it in the ques,according to "Data format" what do u think all data will be in ASCII Format? How will i take data in "Treated blood volume" as it is 5 bytes,sorry for silly ques i am a newbie and never done parsing before....

ChandraRam 30-Aug-12 8:17am

I have no idea what your data is like - you mention in your question that it is all ASCII, so it should be a matter of just reading it as strings, right? Why don't you put it into the structure and read it to see what you actually get?

Tarun Batra 30-Aug-12 8:30am

Sir i am confused how to take 5 byte data can u just tell through pseudo code?

ChandraRam 30-Aug-12 8:31am

You said it is stored as ASCII, right? If so, just create a string of the specified length and you should have it?

Tarun Batra 30-Aug-12 8:37am

sir can write a pseudo code for better explanation?

ChandraRam 30-Aug-12 8:40am

Have you managed to create the structure? Do you know how to create structures that hold strings (characters)? If yes, post what you have done here and I will attempt to go from there...

Tarun Batra 30-Aug-12 8:47am

struct parse
{
char Status of machine[2];
char Rinsemode[2];
char Treated blood volume[6];
}p;

ChandraRam 30-Aug-12 8:49am

Right. What happened to the header info? The first 6 bytes? If that is part of each response, you need to have that in the structure as well... as I told you right at the beginning :)

Tarun Batra 30-Aug-12 8:51am

struct parse
{
char RE[3];
char o[3];
char mc_no[5];
char Status of machine[2];
char Rinsemode[2];
char Treated blood volume[6];
}p;
Now can u explain how to take five byte data?

ChandraRam 30-Aug-12 8:55am

Why do you have one byte extra for each field? "RE" is just 2 char, right? Similarly for all the fields...

After fixing this (and getting it to compile ;), if, as you say the data is ASCII, then parse->TreatedBloodVolume should give you the value in a string. Like so - "10.20", for instance.

Tarun Batra 30-Aug-12 9:00am

sir i thing u didn't get me,what to assign to "parse->TreatedBloodVolume =???",the data should come from the DATA PART of the packet

ChandraRam 30-Aug-12 9:03am

Well, I think you haven't understood me at all... The response data is coming from a COM port, right? I have been asking you to read the response directly into your structure.

Tarun Batra 30-Aug-12 9:27am

well let me try i will ask u again,will it be ok...should i ask here or on your mail id?

ChandraRam 30-Aug-12 9:32am

You do that - and please post here...

Tarun Batra 31-Aug-12 8:38am

sir i did some what work can we discus?

ChandraRam 31-Aug-12 14:22pm

Sure - post what you have done so far.

Tarun Batra 3-Sep-12 2:34am

Sir please check the solution

Tarun Batra 30-Aug-12 9:34am

sure sir thanks for the help.....

can anyone tell me how to do parsing

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can anyone tell me how to do parsing

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