I am using arduino uno R2 and i have some problems with code - b.toCharArray(tok,atm) function. Somehow it is not possible to clear b and tok, but if i comment out toCharArray, there are no problems, except that it do not convert serial input to base64.
i am using this code to read serial input and convert it to base64 code, maybe there are easier way to do this.
Here is the code:
#include <Streaming.h>
#include <Base64.h>
String b = "";
byte atm = 0;
char* tok = "";
char gatavais[200] = "";
void setup() {
Serial.begin(115200);
b.reserve(200);
}
void loop()
{
while (Serial.available()) {
char o = (char)Serial.read();
b += o;
if (o == '\n') {
Serial.println(b);
atm = b.length();
b.toCharArray(tok,atm);
base64_encode(gatavais, tok, atm);
Serial << gatavais << endl;
b = "";
tok = "";
atm = 0;
}
}
}
and here is what serial monitor shows:
hi
aGkA
hijoke
aGlqb2tlAA==
hijokenot again
S4HNQxkq10BDMDnS837l/A==
hijokenotS4HNQxkq10BDMDnS837l/A==hello
S4HNQxkq10BDMDnS837l/Mr0PoDd1epSecAYaAsLpWi5NDl3JYf2
hijokenotS4HNQxkq10BDMDnS837l/Mr0PoDd1epSecAYaAsLpWi5NDl3JYf2i do not understand
S4HNQxkq10BDMDnS837l/Mr0PoDd1epSecAYaAsLpWi5NDl3JYf2R474uppJR/PKYJ4Z91sVd/DdGMEaHAdUr3Qod2Cc1nrzvTBo39kvF9P7
i hope that someone could help me with this problem.
I tried what You suggested, but still no end to my problem. Looks like problem is that i do not know how to empty char tok and String b, i tried many ways to do that, but i have not succeed. i added to code more Serial.println to see what is happening.
i am new to C, my previous programming experience was Pascal.
Here is code:
#include <Streaming.h>
#include <Base64.h>
String b = "";
byte atm = 0;
char* tok;
char gatavais[200] = "";
char o;
void setup() {
Serial.begin(115200);
b.reserve(200);
}
void loop()
{
while (Serial.available()) {
o = (char)Serial.read();
b += o;
if (o == '\n') {
Serial << "Entered: " << b << endl;
atm = b.length();
b.toCharArray(tok,atm);
base64_encode(gatavais, tok, atm);
Serial << "Encoded: " << gatavais << endl;
b = "";
tok = "";
atm = 0;
Serial << "b: " << b << endl;
Serial << "tok: " << tok << endl;
Serial << "atm: " << atm << endl;
}
}
}
correct "apple" encoding is "YXBwbGUA" , what it answers only when second time i entered apple, and with any second entered "apple" seems that program somehow losts or forget to print out text and do not encode anything right.
I tried what You suggested, but still no end to my problem. Looks like problem is that i do not know how to empty char tok and String b, i tried many ways to do that, but i have not succeed. i added to code more Serial.println to see what is happening.
char* tok;
b.toCharArray(tok,atm);
No, you didn't. You are still trying to extract the character data in the String object, b, to a place you have not reserved space at.
char tok[200]; // Or, whatever size is appropriate
b.toCharArray(tok,atm);
Until you fix this fundamental flaw in your program, the rest of your issues will remain.
Seems to me that i almost do not know a thing about programming.
Now, when You told what exactly i need to change, code encodes right, but still i can not manage that after each encoding String "b" and char "tok" are "clear".
It seems like it continue to add all what i enter at console to string "b" and i am so dumb , that i can not make string "b" empty.
If you are going to use a character array anyway, get rid of the stupid String class. Store the data read from the serial port in the tok array (after you give it a better name). All you need to add is a variable to keep track of where in the array to store the next character, and to add a trailing NULL after each character.
The functionality that the String class offers you is not worth the overhead and aggravation it causes.
i don't know how to store serial data to char, so i store it in string.
Like so:
char buffer[40];
byte index = 0;
void loop()
{
while(Serial.available() > 0)
{
char aChar = Serial.read();
if(index < 39) // One less than the array size
{
buffer[index] = aChar;
index++;
buffer[index] = '\0';
}
}
}
Keep in mind that a packet is not received all at once, so you need to add some code to this to detect the start and end of a packet in the stream of data. Almost certainly, you do not want to call base64_encode() with random parts of the packet.
