WIN32 汇编 刚学习的人问一点问题
正在学win32汇编,使用罗云彬的教科书!目前看到了myfirstwindow那一个源程序了,书上说90%的人在看到这段代码的时候退缩了,呵呵!我盯住看了好几天了,貌似有点头绪了,还是问题多多啊,希望得到大家的帮助!
我先把代码copy进来!我把问题写在代码中间了红色字体,期待大家给我指点!
.386
.model flat,stdcall
option casemap:none
include windows.inc
include user32.inc
includelib user32.lib
include kernel32.inc
includelib kernel32.lib
include gdi32.inc
includelib gdi32.lib
.data?
hInstance dd ?
hWinMain dd ?
.const
szClassName db 'My class',0
szCaptionMain db 'My First Window!',0
szText db 'Win32 Assembly,Simple and powerful!',0
.code
_ProcWinMain proc uses ebx edi esi,hWnd,uMsg,wParam,lParam
local @stPs:PAINTSTRUCT
local @stRect:RECT
local @HDC
mov eax,uMsg
;这里的uMsg,包括hWnd,wParam,lParam它们的内容到底是什么?搞不清啊!
;看遍代码也没发现哪里有对这几个参数赋值的语句啊!!
.if eax==WM_PAINT
invoke BeginPaint,hWnd,addr @stPs
mov @HDC,eax
invoke GetClientRect,hWnd,addr @stRect
invoke DrawText,@HDC,addr szText,-1,\
addr @stRect,\
DT_SINGLELINE or DT_CENTER or DT_VCENTER
invoke EndPaint,hWnd,addr @stPs
.elseif eax==WM_CLOSE
invoke DestroyWindow,hWinMain
invoke PostQuitMessage,NULL
.else
invoke DefWindowProc,hWnd,uMsg,wParam,lParam
ret
.endif
xor eax,eax
ret
_ProcWinMain endp
_WinMain proc
local @stWndClass:WNDCLASSEX
local @stMsg:MSG
;这个@stMsg就是消息循环里面用的参数,可是全部代码都没有对MSG进行说明,
;这个MSG结构是不是系统自动生成的,不用对它进行操作啊?
invoke GetModuleHandle,NULL
mov hInstance,eax
;这个hInstance的值是什么呢?是哪一个句柄呢?程序本身的吗?有什么意义呢?
invoke RtlZeroMemory,addr @stWndClass,sizeof @stWndClass
;-------------------------------------------------------------
; 注册窗口
;-------------------------------------------------------------
invoke LoadCursor,0,IDC_ARROW
mov @stWndClass.hCursor,eax
push hInstance
pop @stWndClass.hInstance
mov @stWndClass.cbSize,sizeof WNDCLASSEX
mov @stWndClass.style,CS_HREDRAW OR CS_VREDRAW
mov @stWndClass.lpfnWndProc,offset _ProcWinMain
invoke GetStockObject,WHITE_BRUSH
mov @stWndClass.hbrBackground,eax
mov @stWndClass.lpszClassName,offset szClassName
invoke RegisterClassEx,addr @stWndClass
;----------------------------------------------------------\
; 建立窗口
;----------------------------------------------------------
invoke CreateWindowEx,WS_EX_TOPMOST,\
offset szClassName,offset szCaptionMain,\
WS_OVERLAPPEDWINDOW or WS_VSCROLL or WS_HSCROLL,\
200,200,500,500,\
NULL,NULL,hInstance,NULL
mov hWinMain,eax
;我想这里的hWinMain是获取的即将建立的窗口的句柄吧?
invoke ShowWindow,hWinMain,SW_SHOWNORMAL
invoke UpdateWindow,hWinMain
;--------------------------------------------------------------------------
; 消息循环
;--------------------------------------------------------------------------
.while TRUE
invoke GetMessage,addr @stMsg,NULL,0,0
.break .if eax==0
invoke TranslateMessage,addr @stMsg
invoke DispatchMessage,addr @stMsg
.endw
ret
_WinMain endp
start:
call _WinMain
invoke ExitProcess,NULL
end start