On Monday, 14 March 2016 at 00:12:46 UTC, stunaep wrote:
On Sunday, 13 March 2016 at 12:21:11 UTC, Nicholas Wilson wrote:
On Sunday, 13 March 2016 at 10:32:41 UTC, stunaep wrote:
I have a very large file I need to read data from at certain
positions, but I have run into this error
[...]
when seeking to 6346890680. Seeking to smaller values such as
3580720 work with no problem. The file is well over 8GB, so
it must be able to read data at positions that high.
are you on a 32 or 64 bit system?
You could try 2 or more consecutive relative seeks in place of
an absolute seek.
i.e.
File f = ... ;
f.seek(173445340 , SEEK_SET);
f.seek(173445340 , SEEK_REL);
also what does
f.seek(0,SEEK_END);
writeln(f.tell());
print?
I'm on 64 bit but it needs to work on both. It works for
anything between 0 and 2147483647.
f.seek(0,SEEK_END);
writeln(f.tell());
that throws an error before reaching f.tell()
std.exception.ErrnoException@std\stdio.d(920): Could not seek
in file `./file.dat' (Invalid argument)
----------------
0x000000013FE67868 in @safe bool
std.exception.errnoEnforce!(bool, "std\stdio.d",
920uL).errnoEnforce(bool, lazy immutable(char)[])
0x000000013FE4E7D3 in @trusted void std.stdio.File.seek(long,
int)
Also, seeking relative to the current position throws the same
error as in the original post if it's over max signed int.
f.seek(2147483647, SEEK_SET);
writeln(f.tell()); // prints 2147483647
f.seek(4, SEEK_CUR); // throws error
Hmm. If you're getting an errno exception ( as opposed to a conv)
I really don't
think that theres anything you can do about it, as its a problem
with the C standard
lib. What OS/version are you running?
what does the equivalent in C give you.
i.e.
FILE* f = fopen(...,"r");
fseek(f,0,SEEK_END);
printf("%ld",ftell(f));
printf("%d",errno);
