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我有一个用 MASM 编写的小应用程序，它不断检查活动的 Internet 连接并在有连接时发送哔声，现在我的问题是循环使用 99% 的 CPU，我尝试在循环内放置一个睡眠，但不知何故那行不通？

这是代码：

;build as a WINDOWS app

        .XCREF
        .NOLIST
        INCLUDE    \masm32\include\masm32rt.inc
        INCLUDE    \masm32\include\wininet.inc
        INCLUDELIB \masm32\lib\wininet.lib
        .LIST

;-------------------------------------------------------------------------

IsOnline PROTO   :LPSTR
Sleep PROTO STDCALL :DWORD

;-------------------------------------------------------------------------

IFNDEF FLAG_ICC_FORCE_CONNECTION
FLAG_ICC_FORCE_CONNECTION EQU 1
ENDIF

;-------------------------------------------------------------------------

        .CODE

IsOnline PROC    lpszURL:LPSTR

;Test Internet Connection
;
;lpszURL points to a zero-terminated test URL string (must start with "http://")
;
;Returns EAX = FALSE if not connected
;            = TRUE if connected
;        EDX = connection description (see InternetGetConnectedState documentation)

        push    eax
        mov     edx,esp
        INVOKE  InternetGetConnectedState,edx,0
        or      eax,eax
        jz      IsOnl0

        INVOKE  InternetCheckConnection,lpszURL,FLAG_ICC_FORCE_CONNECTION,0

IsOnl0: pop     edx
        ret

IsOnline ENDP

;-------------------------------------------------------------------------

szURL   db 'http://www.google.com',0

;-------------------------------------------------------------------------

_main   PROC

loop00: INVOKE  IsOnline,offset szURL
        Invoke Sleep,5000
        or      eax,eax
        jz      loop00

        INVOKE  Beep,750,1000
        exit

_main   ENDP

;-------------------------------------------------------------------------

        END     _main
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1 回答 1

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Sleep()可能会破坏寄存器，因此IsOnline()可能会丢失返回值。

于 2013-02-25T22:17:59.130 回答