下面是罗云彬一书中的某个例子，用同一个窗口类创建两个出口，可是在创建第二个窗口的时候，修改了窗口类的类名，这是为什么？
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; Sample code for < Win32ASM Programming 3rd Edition>
; by , http://www.win32asm.com.cn
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
; DcCopy.asm
; 测试设备环境的代码，将一个窗口 DC 对应的象素拷贝到另一个窗口中
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; 使用 nmake 或下列命令进行编译和链接:
; ml /c /coff DcCopy.asm
; Link /subsystem:windows DcCopy.obj
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.386
.model flat,stdcall
option casemap:none
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; Include 文件定义
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include windows.inc
include gdi32.inc
includelib gdi32.lib
include user32.inc
includelib user32.lib
include kernel32.inc
includelib kernel32.lib
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ID_TIMER equ 1
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; 数据段
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.data?
hInstance dd ?
hWin1 dd ?
hWin2 dd ?
.const
szClass1 db 'SourceWindow',0
szClass2 db 'DestWindow',0
szCaption1 db '请尝试用别的窗口覆盖本窗口！',0
szCaption2 db '本窗口图像拷贝自另一窗口',0
szText db 'Win32 Assembly, Simple and powerful !',0
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.code
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; 定时器过程
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_ProcTimer proc _hWnd,uMsg,_idEvent,_dwTime
local @hDc1,@hDc2
local @stRect:RECT
invoke GetDC,hWin1
mov @hDc1,eax
invoke GetDC,hWin2
mov @hDc2,eax
invoke GetClientRect,hWin1,addr @stRect
invoke BitBlt,@hDc2,0,0,@stRect.right,@stRect.bottom,\
@hDc1,0,0,SRCCOPY
invoke ReleaseDC,hWin1,@hDc1
invoke ReleaseDC,hWin2,@hDc2
ret
_ProcTimer endp
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; 窗口过程
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_ProcWinMain proc uses ebx edi esi,hWnd,uMsg,wParam,lParam
local @stPs:PAINTSTRUCT
local @stRect:RECT
local @hDc
mov eax,uMsg
mov ecx,hWnd
;********************************************************************
.if eax == WM_PAINT && ecx == hWin1
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 PostQuitMessage,NULL
invoke DestroyWindow,hWin1
invoke DestroyWindow,hWin2
;********************************************************************
.else
invoke DefWindowProc,hWnd,uMsg,wParam,lParam
ret
.endif
;********************************************************************
xor eax,eax
ret
_ProcWinMain endp
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_WinMain proc
local @stWndClass:WNDCLASSEX
local @stMsg:MSG
local @hTimer
invoke GetModuleHandle,NULL
mov hInstance,eax
invoke RtlZeroMemory,addr @stWndClass,sizeof @stWndClass
;********************************************************************
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
mov @stWndClass.hbrBackground,COLOR_WINDOW + 1
mov @stWndClass.lpszClassName,offset szClass1
invoke RegisterClassEx,addr @stWndClass
invoke CreateWindowEx,WS_EX_CLIENTEDGE,offset szClass1,offset szCaption1,\
WS_OVERLAPPEDWINDOW,\
450,100,300,300,\
NULL,NULL,hInstance,NULL
mov hWin1,eax
invoke ShowWindow,hWin1,SW_SHOWNORMAL
invoke UpdateWindow,hWin1
;********************************************************************
mov @stWndClass.lpszClassName,offset szClass2
invoke RegisterClassEx,addr @stWndClass
invoke CreateWindowEx,WS_EX_CLIENTEDGE,offset szClass2,offset szCaption2,\
WS_OVERLAPPEDWINDOW,\
100,100,300,300,\
NULL,NULL,hInstance,NULL
mov hWin2,eax
invoke ShowWindow,hWin2,SW_SHOWNORMAL
invoke UpdateWindow,hWin2
;********************************************************************
; 设置定时器
;********************************************************************
invoke SetTimer,NULL,NULL,100,addr _ProcTimer
mov @hTimer,eax
;********************************************************************
; 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
;********************************************************************
; 清除定时器
;********************************************************************
invoke KillTimer,NULL,@hTimer
ret
_WinMain endp
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start:
call _WinMain
invoke ExitProcess,NULL
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end start
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