Print Page - GetVersionEx

Title: GetVersionEx
Post by: p0wder on July 13, 2006, 03:07:59 PM

I found some info on getting windows versions. I am trying to get a grasp on jmp's and blocks of code, versus using if () {} ... I am not interested in using the higher level .IF macro syntax, because I am trying to learn. When I try and assemble, I get the error:

"directive must be in control block"

any ideas?

Code Select



.const 

; Windows Versions
szOSTitle	DB "Windows Version",0
szOSError	DB "Error Determining Version",0
szOSUnknown	DB "Unknown Version of Windows",0
szWin98	DB "Windows 98",0
szWinME	DB "Windows ME",0
szWinNT	DB "Windows NT",0
szWin2k	DB "Windows 2000",0
szWinXP	DB "Windows XP",0
szWin2k3	DB "Windows 2003",0
.code

; Determine Windows Version
GetOS proc
	MOV osinfo.dwOSVersionInfoSize, SIZEOF OSVERSIONINFO
	; Get Windows Version
	INVOKE GetVersionEx, addr osinfo
	; Test for success
	CMP EAX, 0
	JNE @F
   		INVOKE MessageBox,NULL,ADDR szOSError,ADDR szOSTitle,MB_OK
   		INVOKE ExitProcess, 0
	@@:
		CMP osinfo.dwMajorVersion, 5
		JE five
		five:
			CMP osinfo.dwMinorVersion, 2
			JE @F
			@@:
				INVOKE wsprintf, ADDR buffer, ADDR format, ADDR szWin2k3, ADDR osinfo.szCSDVersion
			CMP osinfo.dwMinorVersion, 1
			JE @F
			@@:
				INVOKE wsprintf, ADDR buffer, ADDR format, ADDR szWinXP, ADDR osinfo.szCSDVersion
			CMP osinfo.dwMinorVersion, 0
			JE @F
			@@:
				INVOKE wsprintf, ADDR buffer, ADDR format, ADDR szWin2k, ADDR osinfo.szCSDVersion
		CMP osinfo.dwMajorVersion, 4
		JE four
		four:
			CMP osinfo.dwMinorVersion, 0
			JE @F
			@@:
				INVOKE wsprintf, ADDR buffer, ADDR format, ADDR szWinNT, ADDR osinfo.szCSDVersion
			CMP osinfo.dwMinorVersion, 90
			JE @F
			@@:
				INVOKE wsprintf, ADDR buffer, ADDR format, ADDR szWinME, ADDR osinfo.szCSDVersion    
			CMP osinfo.dwMinorVersion, 10
			JE @F
			@@:
				INVOKE wsprintf, ADDR buffer, ADDR format, ADDR szWin98, ADDR osinfo.szCSDVersion  
   		INVOKE MessageBox,NULL, ADDR szOSUnknown, ADDR szOSTitle,MB_OK
   		RET
	.ENDIF
	INVOKE MessageBox,NULL, ADDR buffer, ADDR szOSTitle,MB_OK
	RET
GetOS endp

Title: Re: GetVersionEx
Post by: TNick on July 13, 2006, 03:13:20 PM

I don't know.. maybe you must have an .IF for that .ENDIF?

Title: Re: GetVersionEx
Post by: GM on July 13, 2006, 03:13:51 PM

.endif without .if

Title: Re: GetVersionEx
Post by: TNick on July 13, 2006, 03:21:14 PM

QuoteCMP osinfo.dwMajorVersion, 5
      JE five
      five:
         CMP osinfo.dwMinorVersion, 2
         JE @F
         @@:
            INVOKE wsprintf, ADDR buffer, ADDR format, ADDR szWin2k3, ADDR osinfo.szCSDVersion
         CMP osinfo.dwMinorVersion, 1
         JE @F
         @@:
            INVOKE wsprintf, ADDR buffer, ADDR format, ADDR szWinXP, ADDR osinfo.szCSDVersion
         CMP osinfo.dwMinorVersion, 0
         JE @F
         @@:
            INVOKE wsprintf, ADDR buffer, ADDR format, ADDR szWin2k, ADDR osinfo.szCSDVersion
      CMP osinfo.dwMajorVersion, 4
      JE four

I think that this pice of code will be executed like this:
if osinfo.dwMinorVersion= 2 then let's jump to "five", else, let's continue with "five"
did you mean:

Quote CMP osinfo.dwMajorVersion, 5
JNE four
five:
......
four:
CMP osinfo.dwMajorVersion, 4
jne three

Title: Re: GetVersionEx
Post by: dsouza123 on July 13, 2006, 03:30:35 PM

A simple way to figure it out, is to assemble the version with .if .elseif .else .endif then look at the disassembly.
That should give you insight into coding the equivalent of the higher level constructs.
There is much to be gained by examining the assembly produced for your code by compilers and assemblers.

Title: Re: GetVersionEx
Post by: TNick on July 13, 2006, 04:17:08 PM

I think this is what you want to do:

Quote
.const

; Windows Versions
szOSTitle   DB "Windows Version",0
szOSError   DB "Error Determining Version",0
szOSUnknown   DB "Unknown Version of Windows",0
szWin98   DB "Windows 98",0
szWinME   DB "Windows ME",0
szWinNT   DB "Windows NT",0
szWin2k   DB "Windows 2000",0
szWinXP   DB "Windows XP",0
szWin2k3   DB "Windows 2003",0
.code

; Determine Windows Version
GetOS proc
   MOV osinfo.dwOSVersionInfoSize, SIZEOF OSVERSIONINFO
   ; Get Windows Version
   INVOKE GetVersionEx, addr osinfo
   ; Test for success
   CMP EAX, 0
   JNE @F
       INVOKE MessageBox,NULL,ADDR szOSError,ADDR szOSTitle,MB_OK
       INVOKE ExitProcess, 0
   @@:
      five:
      CMP osinfo.dwMajorVersion, 5
      JNE four

         CMP osinfo.dwMinorVersion, 2
         JNE @F
            mov   eax,   OFFSET szWin2k3
            jmp   IKnow_Is_
         @@:
         CMP osinfo.dwMinorVersion, 1
         JNE @F
            mov   eax,   OFFSET szWinXP
            jmp   IKnow_Is_
         @@:
         CMP osinfo.dwMinorVersion, 0
         JNE @F
            mov   eax,   OFFSET szWin2k
            jmp   IKnow_Is_
         @@:
            jmp   Unknown
      four:
      CMP osinfo.dwMajorVersion, 4
      JNE Unknown
      four:
         CMP osinfo.dwMinorVersion, 0
         JNE @F
            mov   eax,   OFFSET szWinNT
            jmp   IKnow_Is_
         @@:
         CMP osinfo.dwMinorVersion, 90
         JNE @F
            mov   eax,   OFFSET szWinME
            jmp   IKnow_Is_
         @@:
         CMP osinfo.dwMinorVersion, 10
         JNE @F
            mov   eax,   OFFSET szWin98
            jmp   IKnow_Is_
          @@:
             jmp   Unknown
   IKnow_Is_:
      INVOKE wsprintf, ADDR buffer, ADDR format, eax, ADDR osinfo.szCSDVersion
      INVOKE MessageBox,NULL, ADDR buffer, ADDR szOSTitle,MB_OK
      RET
   Unknown:
       INVOKE MessageBox,NULL, ADDR szOSUnknown, ADDR szOSTitle,MB_OK
      RET


GetOS endp

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General Forums => The Campus => Topic started by: p0wder on July 13, 2006, 03:07:59 PM