SD card access using variable as filename, file not found

Other Hardware Storage
1

When the code excutes the file is not found making me think that other invisible charters maybe embeded in the "Star array". I have substituted the actual filename "CodesA.txt" and the file is found, so what is the difference infile names variable vs quoted?

char Star[9];

void RunOnce() {
Star[0] = 'C';
Star[1] = 'o';
Star[2] = 'd';
Star[3] = 'e';
Star[4] = 's';
Star[5] = 'A';
Star[6] = '.';
Star[7] = 't';
Star[8] = 'x';
Star[9] = 't';

Once = "99";
Serial.println(Star);
if (!SD.begin(SDpinout)) {

Serial.println ("NOT INITALIZED");
delay(3500);

return;
}
//CONTINUE TO FIND FILE

if (SD.exists(Star)) {

Serial.println("FILE EXISTS");
delay(3500);

}

CodeFile = SD.open(Star, FILE_READ);

if (CodeFile) {
Slen = (CodeFile.read());
CodeFile.close();
Serial.println(Slen);

}

}

2

Surely you should null terminate the string, otherwise the receiving routine won't know how long the string is and will go through memory until it hits a null.

3

You declare a nine byte array but initialize ten bytes. Star needs to be eleven bytes long and add the null byte as suggested by countrypaul.

Change to:

  char Star[11];

Add:

  Star[10] = 0;