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Compare hex with string

 
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cvargcal



Joined: 17 Feb 2015
Posts: 134

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Compare hex with string
PostPosted: Fri Mar 25, 2016 3:53 pm     Reply with quote

Hi, I have one hex "0x01" and I want compare with string "1", please someone know how I do it?

Code:
key[2];
if(memcmp(&BufferFAT[k], key , sizeof(key)) == 0 )
        {
               fprintf(uart1,"ok"); break;
        }


for example: if in any moment key[2]={0x01} and bufferFAT[0]={1}
how can i do the comparison?

thanks
asmboy



Joined: 20 Nov 2007
Posts: 2128
Location: albany ny

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PostPosted: Fri Mar 25, 2016 5:47 pm     Reply with quote

in a string "1" is ascii 48
and 0x1, 0b1 and 1 are still 1

btw what you posted does no compile either.

of those characters - what were you expecting

ASC 1 or ASC 48 ?
cvargcal



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PostPosted: Fri Mar 25, 2016 7:11 pm     Reply with quote

asmboy wrote:
in a string "1" is ascii 48
and 0x1, 0b1 and 1 are still 1

btw what you posted does no compile either.

of those characters - what were you expecting

ASC 1 or ASC 48 ?


Thank you for answer.

I want compare "01" hex with "01" string.
02 with "02" string
FF with "FF" string...
asmboy



Joined: 20 Nov 2007
Posts: 2128
Location: albany ny

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PostPosted: Fri Mar 25, 2016 8:45 pm     Reply with quote

that's not how memcmp() works.
memcmp is a byte for byte comparison


to find a hexbyte of 0x01 you need to be looking for that same byte

you are being way to vague and
more importantly - yours is a general 'C question
and what does this have to do with CCS?

please check out
http://www.ccsinfo.com/forum/viewtopic.php?t=26245

with special attention to number 4
Ttelmah



Joined: 11 Mar 2010
Posts: 19260

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PostPosted: Sat Mar 26, 2016 1:46 am     Reply with quote

Basic C 101.....

Generally though, work out yourself the best way to do this. Either print the hex to a string, which then means you can do a direct string compare, or convert the string to it's numeric equivalent, and compare this. Look at the strtol conversion, and sprintf.
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