I've been writing a file loader today, and the get pointer keeps jumping.

The file I'm loading is binary (.3ds), and for some reason after my first read, the get pointer jumps from 0 to 3586.
The code is:

std::ifstream file(filepath,std::ios_base::in||std::ios_base::binary);
if(file.is_open() == false)
return false;


//read header chunk
ChunkHeader magicNumber;
file.read((char*)&magicNumber.chunkID,2);
std::streampos pos = file.tellg(); //at this point, after reading only 2 bytes, pos == 3586
file.read((char*)&magicNumber.chunkEnd,4);
pos = file.tellg();


if(magicNumber.chunkID != CHUNKTYPE_MAIN || !file)
{
file.close();
return false;
}

pos = file.tellg();


I even commented out all other code except the load function, and the behavior still persists.
Any suggestions?



*EDIT - And after the first read(), gcount() returns 2

Hello! Maybe your problem is in the way you open your file. You use an ifstream so you don't have to specify ios::in, because it opens it for reading anyway. And instead of || you would have to use the single |.

Try it like this:


std::ifstream file(filepath, ios::binary);


I don't really know if this will help you but you can give it a try.

Thank you so much. It's amazing what a fresh set of eyes can do (+1 for pairs programming I guess). I didn't notice the logical OR typo and the compiler let it slide.
Everything's working now.

Thanks again, I had spent a few frustrating hours staring at this and overlooked it.

Running this might be illuminating:

#include <iostream>

int main()
{
std::cout << "std::ios_base::app: " << std::ios_base::app << '\n';
std::cout << "std::ios_base::in: " << std::ios_base::in << '\n';
std::cout << "std::ios_base::binary: " << std::ios_base::binary << '\n';
std::cout << "std::ios_base::in | binary: " << (std::ios_base::in | std::ios_base::binary) << '\n';
std::cout << "std::ios_base::in || binary: " << (std::ios_base::in || std::ios_base::binary) << '\n';
}