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[求助]汇编中利用指针传回数据的问题
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发表于:
2013-10-17 10:31
5635
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初学汇编，看罗云彬的书，将书中的例子封装成函数出现错误
.386
.model flat, stdcall
option casemap:none
include windows.inc
include kernel32.inc
includelib kernel32.lib
include msvcrt.inc
includelib msvcrt.lib
.data
dqTickCounterStart qword ?
dqTickCounterEnd qword ?
dqTime qword ?
.const
szFormat db "%I64u",0Dh, 0Ah, 0
.code
HighResolutionTimer proc uses ebx edi esi, _dqTickCounterStart : qword, _dqTickCounterEnd : qword, _lpdqTime : dword
local @dqFreq : qword ;计数精度
local @dw1m : dword ;常数
mov @dw1m, 1000000
invoke QueryPerformanceFrequency, addr @dqFreq
mov eax, dword ptr _dqTickCounterStart
mov edx, dword ptr _dqTickCounterStart + sizeof dword
sub dword ptr _dqTickCounterEnd, eax
sbb dword ptr _dqTickCounterEnd + sizeof dword, edx
finit
fild @dqFreq
fild _dqTickCounterEnd
fimul @dw1m
fdivr
fistp qword ptr [_lpdqTime]
;invoke crt_printf, addr szFormat, qword ptr [_lpdqTime] ;这里显示的是对的
ret
HighResolutionTimer endp
start:
invoke QueryPerformanceCounter, addr dqTickCounterStart
;;其他计算
invoke Sleep, 2000
invoke QueryPerformanceCounter, addr dqTickCounterEnd
invoke HighResolutionTimer, dqTickCounterStart, dqTickCounterEnd, addr dqTime
invoke crt_printf, addr szFormat, dqTime ;显示0，不知道为什么结果没写入到dqTime中
invoke ExitProcess, 0
end start
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