CreateWindowEx()函数怎么用啊！

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; Fasm AlphaWin.asm
; 简单的窗体透明示例  by G-Spider
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; 使用下列命令进行编译:
; fasm AlphaWin.asm AlphaWin.exe
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include 'win32a.inc'
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format PE GUI 4.0
entry start

section '.text' code readable writeable executable
  start:
     invoke GetModuleHandle,0
     mov [wc.hInstance],eax
     ;客户区使用黒色画刷
     invoke GetStockObject,BLACK_BRUSH
     mov [wc.hbrBackground],eax
     invoke RegisterClass,wc
     test eax,eax
     jz end_loop
     ;图层样式窗体WS_EX_LAYERED
     invoke CreateWindowEx,WS_EX_LAYERED,szClass,szTitle,\
            WS_VISIBLE+WS_SYSMENU,\
            100,100,600,400,NULL,NULL,[wc.hInstance],NULL
     test eax,eax
     jz end_loop
     ;黒色设为全透明色，其他颜色的透明度设为200 (范围：0~255).
     invoke SetLayeredWindowAttributes,eax,0,200,LWA_ALPHA + LWA_COLORKEY

  msg_loop:
     invoke GetMessage,msg,NULL,0,0
     or eax,eax
     jz end_loop
     invoke TranslateMessage,msg
     invoke DispatchMessage,msg
     jmp msg_loop

  end_loop:
     invoke ExitProcess,[msg.wParam]

proc WindowProc uses ebx esi edi, hwnd,umsg,wparam,lparam
     cmp [umsg],WM_DESTROY
     je .wmdestroy

  .defwndproc:
     invoke DefWindowProc,[hwnd],[umsg],[wparam],[lparam]
     jmp .finish

  .wmdestroy:
     invoke PostQuitMessage,0
     xor eax,eax
  .finish:
     ret

endp
;---------------------------------------------------------------------
;    code is data
;---------------------------------------------------------------------
     msg     MSG
     szClass TCHAR 'FASMWIN32',0
     szTitle TCHAR 'Alpha windows',0
     wc      WNDCLASS 0,WindowProc,0,0,NULL,NULL,NULL,\
             COLOR_WINDOW + 1,NULL,szClass
;---------------------------------------------------------------------
section '.idata' import data readable writeable

  library kernel32,'KERNEL32.DLL',\
     user32,'USER32.DLL',\
     gdi32,'GDI32.DLL'

     include 'api\kernel32.inc'
     include 'api\user32.inc'
     include 'api\gdi32.inc'