; HELLO.EXE - SAY WELCOME - SAY HELLO - TAKE 2 INT'S - RETURN SUM
; Link With -lkernel32

section .data                                    ;Constants
  output_handle     db   0                           ;Define byte 0
  bytes_written     db   0                           ;Define byte 0
  bytes_written_2   db   0                           ;Define byte 0
  STD_OUTPUT_HANDLE dd  -11                          ;Define dword -11
  welcome_msg       db   "Welcome",10                ;Define byte "welcome" + newline
  hello_msg         db   10,"Hello World",10        ;Define byte newline + "Hello" + newline

section .text                                    ;Code
  global  _WinMain@16                                ;Define where to start
  extern  _ExitProcess@4                             ;Get ExitProcess Function, 4 bytes of args
  extern  _GetStdHandle@4                            ;Get GetStdHandle Function, 4 bytes of args
  extern  _WriteConsoleA@20                          ;Get WriteConsoleA Function, 20 bytes of args
  extern  _Sleep@4                                   ;Get Sleep Function, 4 bytes of args
  extern  _GetLastError@0                            ;Get GetLastError Function, 0 byter of args

_WinMain@16:                                     ;Where to start
  call GetHandle                                     ;Goto section GetHandle
  call WelcomeToConsole                              ;Goto section WriteConsole
  call GetHandle                                     ;Goto section GetHandle
  call HelloToConsole                                ;Goto section HelloToConsole
  call ExitProgram                                    ;Goto section ExitProgram

GetHandle:                                       ;Get Output Handle ($CONOUT)
  push dword [STD_OUTPUT_HANDLE]                     ;Arg of GetStdHandle, DWORD nStdHandle, (-11)
  call _GetStdHandle@4                               ;Call GetStdHandle
  mov [output_handle], eax                           ;Move contents of CPU register eAx to mem addr of output_handle

WelcomeToConsole:                                ;Write Welcome Message To Console
  push dword 0                                       ;Last arg of WriteConsole must be 0, LPVOID lpReserved, (0)
  push bytes_written                                 ;Penultimate arg of WriteConsole, LPDWORD lpNumberOfCharsWritten, (mem addr of bytes_written)
  push dword 8                                       ;Third arg of WriteConsole, DWORD nNumberOfCharsToWrite, (9)
  push welcome_msg                                   ;Second arg of WriteConsole, VOID *lpBuffer, (welcome_msg)
  push dword [output_handle]                         ;First arg of WriteConsole, HANDLE hConsoleOutput, (mem addr of output_handle, converted to dword
  call _WriteConsoleA@20                             ;Call WriteConsoleA

HelloToConsole:                                  ;Write Hello Message To Console
  push dword 0                                       ;Last arg of WriteConsole must be 0, LPVOID lpReserved, (0)
  push bytes_written_2                               ;Penultimate arg of WriteConsole, LPDWORD lpNumberOfCharsWritten, (mem addr of bytes_written_2)
  push dword 13                                      ;Third arg of WriteConsole, DWORD nNumberOfCharsToWrite, (14)
  push hello_msg                                     ;Second arg of WriteConsole, VOID *lpBuffer, (hello_msg)
  push dword [output_handle]                         ;First arg of WriteConsole, HANDLE hConsoleOutput, (mem addr of output_handle, converted to dword
  call _WriteConsoleA@20                             ;Call WriteConsoleA

ExitProgram:                                     ;Exit Program
  push dword 3000                                    ;Arg of Sleep, DWORD dwMilliseconds, (3000)
  call _Sleep@4                                      ;Call Sleep
  push dword 0                                       ;Arg of ExitProcess, UINT uExitCode, (0, ERROR_SUCESS)
  call _ExitProcess@4                                ;Call ExitProcess