This interactive hello world creates minimum message box then prints text in console, reads input from user and prints the input back to console.
Create file hello.asm and put following code in it:
; Interactive Hello World Windows x64 Assembly MASM64
; ml64 hello.asm /link /subsystem:windows /defaultlib:kernel32.lib /defaultlib:user32.lib /entry:Start
; ivane5
extern ExitProcess: PROC
extern MessageBoxA: PROC
extern GetStdHandle: PROC
extern WriteConsoleA: PROC
extern FlushConsoleInputBuffer: PROC
extern ReadConsoleA: PROC
.data
caption db '64-bit hello!',0
message db 'Hello World!',10,0
STD_OUTPUT_HANDLE dq -11
OUTPUT_HANDLE dq 0
STD_INPUT_HANDLE dq -10
INPUT_HANDLE dq 0
ENABLE_LINE_INPUT dq 0002h
cWritten dq 0
inputBuffer db 64 dup(0)
numberOfEventsRead dw 0
.code
Start PROC
sub rsp, 28h ; shadow space, for debugging
mov rcx, 0 ; hWnd = HWND_DESKTOP
lea rdx, message
lea r8, caption
mov r9d, 0
call MessageBoxA ; call MessageBox API function
mov rcx, STD_OUTPUT_HANDLE
call GetStdHandle
mov OUTPUT_HANDLE, rax
mov rcx, STD_INPUT_HANDLE
call GetStdHandle
mov INPUT_HANDLE, rax
mov rcx, OUTPUT_HANDLE
lea rdx, message
mov r8, 13
lea r9, cWritten
push 0
call WriteConsoleA ; Write the hello world message
mov rcx, INPUT_HANDLE
call FlushConsoleInputBuffer
mov rcx, INPUT_HANDLE
lea rdx, inputBuffer
mov r8, 64
lea r9, numberOfEventsRead
call ReadConsoleA ; Read user input
mov rcx, OUTPUT_HANDLE
lea rdx, inputBuffer
mov r8, 64
lea r9, cWritten
push 0
call WriteConsoleA ; Write user input back to console
mov ecx, 0 ; uExitCode = 0
call ExitProcess
Start ENDP
End
Open, Visual Studio 2022 Developer Command Prompt, and within the prompt open the folder in which the hello.asm is located.
Run following command:
ml64 hello.asm /link /subsystem:windows /defaultlib:kernel32.lib /defaultlib:user32.lib /entry:Start
Then run:
hello.exe
