Why is fread() stopping at a string of 0s?
c, file, fread, io
Solution
in windows, 0x1A a.k.a `^Z` is the end-of-file character. You have opened the file in text mode rather than binary mode. When you open a file in text mode in windows it will read until end-of-file or the first `^Z` character.
pass `"rb"` to `fopen` instead of `"r"` to open the file in binary mode.
Problem
I am trying to read a binary file with the following binary configuration ``` 00 00 00 1A 79 20 83 DB 44 ... ``` using the following function ``` static BitArray getBitArray(string filename) { FILE *fs = fopen(filename.data(),"r"); fseek (fs , 0 , SEEK_END); unsigned long s = ftell (fs); rewind (fs); unsigned char *buffer = new unsigned char[s+1]; fread(buffer,1,s,fs); BitArray bArray; for(int i=0; i<s; i++) bArray.add(buffer[i]); delete[] buffer; fclose(fs); return bArray; } ``` where `BitArray` is just my own bit manipulating class. The problem is, for the bin file I mentioned above, it only reads the first three 0s, like this ``` 00 00 00 ``` even though `fseek` has found the correct file size. As to why I need that string 0s, is because `00 00 00 1A` forms a 32-bit integer, which happened to be small enough to leave three `0x00`s. I suspected that a string of `0x00`s in the beginning of a file is recognized as `EOF`, so i tried padding a char in front of the file, but it didn't quite work out. What could be causing this?