• tcak (9/9) Apr 07 2021 I am talking about std.file.File.
• Adam D. Ruppe (4/6) Apr 07 2021 What did you wrote?
• tcak (5/11) Apr 07 2021 Well, I have a struct, that is defined as a variable already. I
• Adam D. Ruppe (7/11) Apr 07 2021 file.rawRead((cast(ubyte*) &your_struct)[0 .. your_length]);

tcak <tcak gmail.com> writes:

I am talking about std.file.File.

I have opened the file, and at a specific offset.

I want to read X many bytes from the file, and want it to be 
written to given address directly without any Magical D-stuff 
like ranges etc.

Is there a way to do this without getting into C or Posix header 
files?

There is rawRead, but it takes an array as parameter, which 
causes a dirty looking code with cast etc!

Adam D. Ruppe <destructionator gmail.com> writes:

On Wednesday, 7 April 2021 at 11:42:56 UTC, tcak wrote:
 There is rawRead, but it takes an array as parameter, which 
 causes a dirty looking code with cast etc!

What did you wrote?


file.rawRead(address[0 .. desiredLength])


should do what you want.

tcak <tcak gmail.com> writes:

On Wednesday, 7 April 2021 at 12:50:01 UTC, Adam D. Ruppe wrote:
 On Wednesday, 7 April 2021 at 11:42:56 UTC, tcak wrote:
 There is rawRead, but it takes an array as parameter, which 
 causes a dirty looking code with cast etc!

 What did you wrote?


 file.rawRead(address[0 .. desiredLength])


 should do what you want.

Well, I have a struct, that is defined as a variable already. I 
want to read X bytes from the file (not Struct.sizeof bytes 
though), and read into the struct variable without any extra 
buffer.

Adam D. Ruppe <destructionator gmail.com> writes:

On Wednesday, 7 April 2021 at 12:57:12 UTC, tcak wrote:
 Well, I have a struct, that is defined as a variable already. I 
 want to read X bytes from the file (not Struct.sizeof bytes 
 though), and read into the struct variable without any extra 
 buffer.

file.rawRead((cast(ubyte*) &your_struct)[0 .. your_length]);


Of course you can also just use the C function too:

fread(&your_struct, your_length, 1, file.getFP());


the std.stdio is just a wrapper around FILE* so it offers get FP 
to use for the other things.

It just isn't that different really aside from the little cast.