How to split in string

Question

I want to split this:

char* value = "12;32;blue";
or
string value = "12;32;blue";

into this vars:

TV = 12;
AR = 32;
LED = "blue";

is it possible?

Answer 1

For C-strings (char*), your best option (in terms of performance and memory consumption) is to use strtok:

char* value = "12;32;blue";
char* token = strtok(value, ";");
int TV = atoi(token);
token= strtok(0, ";");
int AR = atoi(token);
token = strtok(0, ";");
char* LED = token;

Note 1: the code above takes it for granted that value is properly formatted, i.e. contains 3 parts split by ;. If it is not sure, then you should add additional checks on token value returned by strtok.

Note 2: strtok is modifiying its value argument, so that at the end of the code above, value will not be equal to 12;32;blue any longer.

Note 3: LED variable above will point directly to the character b inside value, which means that if value is modified afterwards, LED might be modified as well.

Answer 2

Scan function should do the job.

int tv, ar;
char color[10];
sscanf(value, "%d;%d;%s", &tv, &ar, color);

• Jasmine: That's a great old trick. I totally forgot about it! daniweb.com/software-development/c/code/216535/…
• jfpoilpret: I think you meant sscanf not scanf as the latter needs stdin which Arduino doesn't have. Also in your example you shouldn't pass &color, but rather color.
• Lugarini: and where do i tell the sscanf to get val from my var 'value' ?
• TMa: @Thiago: as first parameter. Corrected.