win32汇编实现秒表计时，精确到毫秒

下面是一个Win32汇编秒表程序，使用了Windows API中的计时器函数来实现毫秒级的计时和显示：

.386
.model flat, stdcall
option casemap:none

include \masm32\include\windows.inc
include \masm32\include\user32.inc
includelib \masm32\lib\user32.lib
include \masm32\include\kernel32.inc
includelib \masm32\lib\kernel32.lib

.data
msg db 'Time:',13,10,0
count dd 0
tick dd 0
hWnd dd 0

.code
start:
; 创建窗口
invoke GetModuleHandle, NULL
mov hInstance, eax
invoke WinMain, hInstance, NULL, NULL, SW_SHOWDEFAULT
invoke ExitProcess, eax

WinMain proc hInst:HINSTANCE, hPrevInst:HINSTANCE, lpCmdLine:LPSTR, nCmdShow:DWORD
mov eax, hInst
mov hInstance, eax

; 注册窗口类
mov wc.cbSize, SIZEOF WNDCLASSEX
mov wc.style, CS_HREDRAW or CS_VREDRAW
mov wc.lpfnWndProc, offset WndProc
mov wc.cbClsExtra, 0
mov wc.cbWndExtra, 0
push hInstance
pop wc.hInstance
mov wc.hbrBackground, COLOR_WINDOW+1
mov wc.lpszMenuName, NULL
mov wc.lpszClassName, offset szClassName
push IDI_APPLICATION
push NULL
call LoadIcon
mov wc.hIcon, eax
mov wc.hIconSm, eax
push IDI_APPLICATION
push NULL
call LoadCursor
mov wc.hCursor, eax
invoke RegisterClassEx, addr wc

; 创建窗口
invoke CreateWindowEx, WS_EX_CLIENTEDGE, offset szClassName, offset szTitle, WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, 320, 240, NULL, NULL, hInstance, NULL
mov hWnd, eax
invoke ShowWindow, hWnd, SW_SHOW
invoke UpdateWindow, hWnd

; 设置计时器
invoke SetTimer, hWnd, 1, 1, NULL

; 消息循环
msgloop:
invoke GetMessage, ADDR msg, NULL, 0, 0
cmp eax, 0
je quit
invoke TranslateMessage, ADDR msg
invoke DispatchMessage, ADDR msg
jmp msgloop

quit:
invoke KillTimer, hWnd, 1
invoke DestroyWindow, hWnd
invoke UnregisterClass, offset szClassName, hInstance
mov eax, msg.wParam
ret

WndProc proc hWnd:HWND, uMsg:UINT, wParam:WPARAM, lParam:LPARAM
cmp uMsg, WM_CREATE
je wmcreate
cmp uMsg, WM_TIMER
je wmtimer
cmp uMsg, WM_PAINT
je wmpaint
cmp uMsg, WM_DESTROY
je wmdestroy
jmp defwndproc

wmcreate:
mov eax, 0
ret

wmtimer:
; 获取当前时间
invoke GetTickCount
mov tick, eax

; 计算时间差
sub eax, count
mov count, tick

; 更新窗口
invoke InvalidateRect, hWnd, NULL, TRUE
invoke UpdateWindow, hWnd
ret

wmpaint:
; 绘制文本
invoke BeginPaint, hWnd, ADDR ps
invoke GetClientRect, hWnd, ADDR rect
invoke SetTextColor, ps.hdc, 0000FFh
invoke SetBkMode, ps.hdc, TRANSPARENT
invoke TextOut, ps.hdc, 10, 10, ADDR msg, sizeof msg - 1
invoke wsprintf, ADDR buf, '%d.%03d', count / 1000, count % 1000
invoke TextOut, ps.hdc, 60, 10, ADDR buf, eax
invoke EndPaint, hWnd, ADDR ps
ret

wmdestroy:
mov eax, 0
jmp quit

defwndproc:
invoke DefWindowProc, hWnd, uMsg, wParam, lParam
ret

szClassName db 'MyWindowClass',0
szTitle db 'My Window',0
buf db 16 dup (?)
rect RECT <0, 0, 320, 240>
wc WNDCLASSEX ?
ps PAINTSTRUCT <>
hInstance HINSTANCE ?
hWnd HWND ?
msg MSG <>
count dd 0
tick dd 0

end start

该程序创建了一个窗口，通过设置计时器每1毫秒触发一次回调函数来实现计时和显示。在回调函数中，通过调用`GetTickCount`函数获取当前时间，计算时间差，并更新窗口显示。窗口绘制使用了Windows API中的GDI函数。

注意：该程序只是一个简单的示例，实际使用中可能需要更复杂的逻辑来处理计时和显示，同时需要注意计时器的精度和稳定性。