c++ - Need the output of printf as a String or char array -


i have been working on arduino project. has written library mfrc522, rfid. need change on library, , need use output of printf variable.

i meant:

serial.print(f("card uid:")); (byte = 0; < uid->size; i++) {     if(uid->uidbyte[i] < 0x10)         serial.print(f(" 0"));     else         serial.print(f(" "));     serial.print(uid->uidbyte[i], hex); }  serial.println();

and in general output comes as

card uid: a6 74 e6 2b

i need these id's put them in array or this. please teach me ways use them variables.

look standard sprintf (better snprintf, better in linux asprintf) c, posix open_memstream, (or, in standard c++, std::ostringstream) or similar functions arduino.


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