程式語言 - Flat Assembler (FASM) - Win32 API - Create Brush

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

繪畫的顏色設定可以分成Brush、Pen兩種，Brush代表填充的顏色，Pen則是線條的顏色

main.asm

    include "head.asm"

    section ".text" code readable executable
proc WndProc hWnd, uMsg, wParam, lParam
    local hdc:DWORD
    local brush:DWORD
    local ps:PAINTSTRUCT
  
    mov eax, [uMsg]
    cmp eax, WM_PAINT
    je .handle_paint
    cmp eax, WM_CLOSE
    je .handle_close
    cmp eax, WM_DESTROY
    je .handle_destroy
    invoke CallWindowProc, [pDefWndProc], [hWnd], [uMsg], [wParam], [lParam]
    jmp .finish
   
.handle_paint:
    lea eax, [ps]
    invoke BeginPaint, [hWnd], eax
    mov [hdc], eax
  
    invoke CreateSolidBrush, 0ffh
    mov [brush], eax
    lea eax, [ps]
    add eax, PAINTSTRUCT.rcPaint
    invoke FillRect, [hdc], eax, [brush]
 
    lea eax, [ps]
    invoke EndPaint, [hWnd], eax
    invoke DeleteObject, [brush]
    xor eax, eax
    jmp .finish
   
.handle_close:
    invoke DestroyWindow, [hWnd]
    xor eax, eax
    jmp .finish
       
.handle_destroy:
    invoke PostQuitMessage, 0
    xor eax, eax
    jmp .finish
        
.finish:
    ret
endp
       
proc WinMain hInst, hPrevInst, CmdLine, CmdShow
    local msg:MSG
       
    invoke CreateWindowEx, WS_EX_LEFT, WC_DIALOG, szName, \
        WS_OVERLAPPEDWINDOW or WS_VISIBLE, 0, 0, 300, 300, NULL, NULL, NULL, NULL
    mov [hWin], eax
       
    invoke SetWindowLong, [hWin], GWL_WNDPROC, WndProc
    mov [pDefWndProc], eax
    
@@:
    lea eax, [msg]
    invoke GetMessage, eax, NULL, 0, 0
    cmp eax, 0
    je @f
    lea eax, [msg]
    invoke DispatchMessage, eax
    jmp @b
@@:
    mov eax, [msg.wParam]
    ret
endp
       
start:
    invoke GetModuleHandle, NULL
    mov [hInstance], eax
        
    invoke GetCommandLine
    mov [pCommand], eax
        
    stdcall WinMain, [hInstance], NULL, [pCommand], SW_SHOWNORMAL
    invoke ExitProcess, eax

Line 24~25：產生一個紅色的Brush
Line 26~28：將可視區域填入紅色
Line 32：釋放資源

完成