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cvargcal
Joined: 17 Feb 2015
Posts: 134
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| help for function extract string |
 Posted: Tue Mar 31, 2020 12:22 pm |
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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); //
}
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out:
| Quote: | +CBC: bcs
bcl
voltage
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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++;
} //
} |
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dluu13
Joined: 28 Sep 2018
Posts: 395
Location: Toronto, ON
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| Posted: Tue Mar 31, 2020 2:08 pm |
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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/ |
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cvargcal
Joined: 17 Feb 2015
Posts: 134
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| Posted: Tue Mar 31, 2020 3:06 pm |
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| 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
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