On Thursday, 11 May 2017 at 07:24:00 UTC, AntonSotov wrote:
import std.stdio;

int main()
{
    auto big = File("bigfile", "r+"); //bigfile size 20 GB
    writeln(big.size);  // ERROR!
    return 0;
}

//////////////////////////////////////
std.exception.ErrnoException@std\stdio.d(1029): Could not seek in file `bigfile` (Invalid argument)

I can not work with a large file?
32 bit executable.

Are you in windows perchance? IIRC the when compiling for 32 bit it doesn't use the 64 bit C file function so that will not work.

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