• Baby Beaker (3/3) May 02 2020 I need open a Binary EXE, it can be using "rb" mode and convert
• welkam (16/19) May 02 2020 You dont convert binary data to hexadecimal. You display it as
• wolframw (3/4) May 02 2020 This will not work. To be able to write to a binary file, you
• Baby Beaker (2/6) May 03 2020 kkkkkkkkkkkk sure!

Baby Beaker <thegrapevine email.com> writes:

I need open a Binary EXE, it can be using "rb" mode and convert 
it to Hexadecimal for me make some changes and save as "rb" 
again. How can I make it? Thank you.

welkam <wwwelkam gmail.com> writes:

On Saturday, 2 May 2020 at 21:05:32 UTC, Baby Beaker wrote:
 I need open a Binary EXE, it can be using "rb" mode and convert 
 it to Hexadecimal for me make some changes and save as "rb" 
 again. How can I make it? Thank you.

You dont convert binary data to hexadecimal. You display it as 
hexadecimal. If you want to print file contents to console in hex 
do something like this.

import std.stdio;
import std.algorithm;

auto fd = File("filename", "r"); //open file for reading
ubyte[] data; //a GC allocated buffer for data
fd.rawRead(data); //read the data

data[0..50].each!(n => stdout.writef("%X ",n));
/*take 50 elements from array and for each of them call lambda 
that converts ubyte to string in hex format and prints to the 
stdout*/

if you want to assign to this data you can do something like this

data[0] = Oxff;

And then write to file

wolframw <wolframw protonmail.com> writes:

On Saturday, 2 May 2020 at 21:05:32 UTC, Baby Beaker wrote:
 save as "rb" again.

This will not work. To be able to write to a binary file, you 
will have to use "wb".

Baby Beaker <thegrapevine email.com> writes:

On Saturday, 2 May 2020 at 22:26:20 UTC, wolframw wrote:
 On Saturday, 2 May 2020 at 21:05:32 UTC, Baby Beaker wrote:
 save as "rb" again.

 This will not work. To be able to write to a binary file, you 
 will have to use "wb".

kkkkkkkkkkkk sure!