程式語言 - Flat Assembler (FASM) - Win32 API - Hello, world!


參考資訊：
https://board.flatassembler.net/

main.asm

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    format PE GUI 4.0
    entry start
 
    include "c:\fasm\include\win32a.inc"
 
    section ".idata" import data readable writeable
library user, "user32.dll", kernel, "kernel32.dll"
 
import user,   MessageBox,  "MessageBoxA"
import kernel, ExitProcess, "ExitProcess"
 
    section ".data" data readable writeable
szCaption db "main",0
szContent db "Hello, world!",0
 
    section ".text" code readable executable
start:
    invoke MessageBox, NULL, szContent, szCaption, MB_OK
    invoke ExitProcess, 0

Line 1：執行檔的格式
Line 2：程式的進入點
Line 4：Header檔案
Line 6：Import區段
Line 7：使用到的Library
Line 9~10：使用到的Win32 API
Line 12：初始化的資料區段
Line 13~14：初始化的Global變數，型態是byte(char)且最後一個byte是0
Line 16：程式區段
Line 17：程式的進入點
Line 18：顯示Message對話盒，invoke其實就是call + push的綜合指令
Line 19：結束Process並且釋放相關資源

Makefile 

export WINEPREFIX=/home/user/.wine_x86

TARGET=main
MYWINE=box86 wine
FASM32=/home/user/.wine_x86/drive_c/fasm

all:
	${MYWINE} ${FASM32}/fasm.exe ${TARGET}.asm

run:
	${MYWINE} ${TARGET}.exe

clean:
	rm -rf ${TARGET}.exe

編譯、執行 

$ make
$ make run