如何在 c/c++ 中使用 gzgetc 检测换行符

Question

I want to read an entire line of a file character by character using gzgetc and stop when the newline is encountered. I know there is a function to grab the entire line but I would like to try to do it this way first. I tried:

Int c;

do {
  c = gzgetc((gzFile) fp);
  cout << c;
} while (c != '\n');

The result was an infinite loop. I tried adding (char) before c, still the same result. What am I doing wrong? The data file I am trying to read is encoded in base64 and I want to read in each token separated by space. Some of the lines are variable length and have a mixture of encoded and not encoded data which I set up an algorithm for I just need to know how to stop at newline.

Answer 1

You need to also check for gzgetc() returning -1 , which indicates an error or end of file, and exiting the loop in that case. Your infinite loop is likely due to one of those.