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Index > Windows > GetTickCount() sub not working

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Avenger



Joined: 22 May 2013
Posts: 2
Avenger
Code:
include 'win32ax.inc'
.code
start:
      invoke GetTickCount
      mov ebx, eax
      xor eax, eax
      invoke GetTickCount
      sub eax, ebx
      invoke wsprintf, _buffer, _format, eax
      add esp, 12
      invoke MessageBox, 0, _buffer, "Test", 0
      ret
.end start          ;
.data
     _buffer rb 20
     _format db '%u'    

Why eax return 0?
Post 22 May 2013, 14:29
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AsmGuru62



Joined: 28 Jan 2004
Posts: 1408
Location: Toronto, Canada
AsmGuru62
it is too fast!
Post 22 May 2013, 14:44
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randomdude



Joined: 01 Jun 2012
Posts: 83
randomdude
maybe because the time elapsed between calling the first and second GetTickCount is less than 10 milliseconds?

Quote:
The resolution of the GetTickCount function is limited to the resolution of the system timer, which is typically in the range of 10 milliseconds to 16 milliseconds.


Code:
include 'win32ax.inc' 
.code 
start: 
      invoke GetTickCount 
      mov ebx, eax 
      invoke Sleep,1 
      invoke GetTickCount 
      sub eax, ebx 
      invoke wsprintf, _buffer, _format, eax 
      add esp, 12 
      invoke MessageBox, 0, _buffer, "Test", 0 
      ret 
.end start          ; 
.data 
     _buffer rb 20 
     _format db '%u'    


returns 16 milliseconds Very Happy
Post 22 May 2013, 14:44
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HaHaAnonymous



Joined: 02 Dec 2012
Posts: 1180
Location: Unknown
HaHaAnonymous
[ Post removed by author. ]


Last edited by HaHaAnonymous on 28 Feb 2015, 20:23; edited 1 time in total
Post 22 May 2013, 15:04
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Avenger



Joined: 22 May 2013
Posts: 2
Avenger
It's working! Thanks Smile
Post 22 May 2013, 15:04
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