Beginning x64 Assembly Programming: From Novice to AVX Professional

© Jo Van Hoey 2019

J. Van HoeyBeginning x64 Assembly Programminghttps://doi.org/10.1007/978-1-4842-5076-1_43

43. Windows Files

Jo Van Hoey¹ 

(1)

Hamme, Belgium

 

In Linux, we used syscalls to manipulate files. In Windows, we have to follow other rules. As mentioned in previous chapters, we use the Windows API.

Listing 43-1 shows the example code.

%include "win32n.inc"

extern printf

extern CreateFileA

extern WriteFile

extern SetFilePointer

extern ReadFile

extern CloseHandle

section .data

    msg      db 'Hello, Windows World!',0

    nNumberOfBytesToWrite equ $-msg

    filename db  'mytext.txt',0

    nNumberOfBytesToRead  equ 30

    fmt      db "The result of reading the file: %s",10,0

section .bss

    fHandle                resq 1

    lpNumberOfBytesWritten resq 1

    lpNumberOfBytesRead    resq ...