[bob.wolff68]

This code will be running on the robot when it runs - don't know if that's obvious or not -- and as such, 'testPattern.jpg' must be on the robot and must be in the 'current working directory' of the running program. If you're feeling confident that all this makes sense so far, I would suggest that you try doing a little test to ensure that the file is really "there" by opening the file and reading the first 4 bytes of the file or something...if the following all checks out then I'd ask ... how are you creating this testPattern.jpg file? Could it have been saved in a different format than .jpg by a writing function? I seem to recall a situation last year where files we were writing wound up being BMP format instead of JPG due to a saving issue.

FILE* fp = fopen("testPattern.jpg", "rb");
if (fp) {
  unsigned char test[10];
  int read;

  read = fread(test, 1, 4, fp);
  if (read != 4) {
    printf("Did not read 4 bytes. Error.\n");
  }
  else {
    printf("SUCCESS. File at least exists.\n");
  }
}
else {
  printf("File not found.\n");
}