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help for function extract string

 
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cvargcal



Joined: 17 Feb 2015
Posts: 125

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help for function extract string
PostPosted: Tue Mar 31, 2020 12:22 pm     Reply with quote

Hi, I have these strings:

+CBC: <bcs>, <bcl>,<voltage>
+CSQ: <rssi>,<ber>

Using strtok I can separate by "," but i get one array where i need clean.

So i search a function for extract "+CBC: " and "+CSQ: ", but the idea is it can work for any "header" like "ABCD: " or "12346786A: "

This for can get bcs and rssi or any data just after ": " from clean way.


My code
Code:
     char string[50], *ptr;
     char delimitador[]=": ,\r";                 // Token
     CHECK_VOLT();                              // AT+CBC
     strcpy(string,Receive_String_uart2);       // +CBC: #,###,####   +CBC: <bcs>, <bcl>,<voltage>
     ptr = strtok(string, delimitador);         //
     i=0;                                       //
     
     while(ptr != NULL){                        //
          if(*ptr != '\n'){                     //
            strcpy(&dat_batt[i][0],ptr);        //
            i++;                                //
            }                                   //
            ptr = strtok(NULL,delimitador);     //
        }

out:
Quote:
+CBC: bcs
bcl
voltage

So after i need get bcs, or any data without "header".

I don't want to make manual way like this:
Code:
//! ------ CSQ----       
        if (CHECK_SNG()) {   // CSQ: ##,##   +CSQ: <rssi>,<ber>
           n=0;i=0;                                            //
           for(i=0;i<5;i++){                                   //
              SGN[i]=Receive_String_uart2[n+15]; n++;         
           }                                                   //
        }
dluu13



Joined: 28 Sep 2018
Posts: 264
Location: Toronto, ON

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PostPosted: Tue Mar 31, 2020 2:08 pm     Reply with quote

I'm not sure if I understand you completely, but you can use a function such as strstr() to find if your string contains CBC or CSQ. You can use strchr() to find the first occurrence of ':' and then set your string to the address of the character after ':'

When I was searching for stuff in my RS232 communications I used this page a lot:
http://www.cplusplus.com/reference/cstring/
cvargcal



Joined: 17 Feb 2015
Posts: 125

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PostPosted: Tue Mar 31, 2020 3:06 pm     Reply with quote

dluu13 wrote:
I'm not sure if I understand you completely, but you can use a function such as strstr() to find if your string contains CBC or CSQ. You can use strchr() to find the first occurrence of ':' and then set your string to the address of the character after ':'

When I was searching for stuff in my RS232 communications I used this page a lot:
http://www.cplusplus.com/reference/cstring/


thanks you, yes that can be a way... I will study it.


EDIT

one solution like say dluu13, but i want find the way to search with "custom" header and not with char


Code:
int main ()
{
  int i;
  char str[] = "+CBC: 145frfrfrrfrhy";
  char * pch;
  int index=0;
  char word[50];
  pch=strrchr(str,' ');
  index=pch-str+1;
 
  printf ("Last occurence of ' ' found at %d \n",index);
  i=0;
  for(str[index];str[index+i]!=0;i++){                                   //
   word[i]=str[index+i];       
   }

 
  printf ("word: %s \n",word);
  return 0;
}





out

Quote:
Last occurence of ' ' found at 6
word: 145frfrfrrfrhyfrfrfrrfrhy



tested in https://www.onlinegdb.com/online_c_compiler



EDIT 2

My code like function


Code:
char string[] = "+CBC: 456";
char start=' ';


char extract_string_since_char (char *str, char chr){

  int i=0;
  char temp[10];
  char * pch;
  int index=0;
  char result[10];
 
  strcpy(temp,str);
  pch=strrchr(temp,chr);
  index=pch-temp+1;
 
  //printf ("Last occurence of ' ' found at %d \n",index);
 
  for(;temp[index+i]!=0;i++)
  {                                   //
   result[i]=temp[index+i];       
  }

 // printf ("word: %s \n",result); 
  return result;
}

                       


void main()  {
 char word[10];

 strcpy(word,extract_string_since_char(string,start));
 printf("%s", word);

}



out

Quote:
456
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