Portable way to get file size in C/C++

Question

I need to determin the byte size of a file.

The coding language is C++ and the code should work with Linux, windows and any other operating system. This implies using standard C or C++ functions/classes.

This trivial need has apparently no trivial solution.

Answer 1

Using std's stream you can use:

std::ifstream ifile(....);
ifile.seekg(0, std::ios_base::end);//seek to end
//now get current position as length of file
ifile.tellg();

If you deal with write only file (std::ofstream), then methods are some another:

ofile.seekp(0, std::ios_base::end);
ofile.tellp();