;--------------------------------------
; CheckWindowsVersion
;
; By Wobl (Robert Grant), written for software used by www.logitor.com
;
; Quits program if version not recognised or not high enough
;
; Usage:
; Define $MIN_WIN_VER to be 'XP', '2000', 'NT 4', 'NT 3', 'ME', '98', '95'
; Place the output of Joost Verburg's GetWindowsVersion in $0.
;
; Call CheckWindowsVersion
;
; Info:
; Defines a 'later' version as being the order the version are listed above -
; i.e. ME is lower than NT 3. Change the order of the checkIfs to change that.
; If the version of Windows the person is running is compatible then then program
; will continue, otherwise it will quit with an error.

Function CheckWindowsVersion

  StrCmp $0 '' unhappyEnding

  checkIfXP:                                                        

    StrCmp $0 'XP' happyEnding

    StrCmp $MIN_WIN_VER 'XP' unhappyEnding
    goto checkIfkk

  checkIfkk:

    StrCmp $0 '2000' happyEnding

    StrCmp $MIN_WIN_VER '2000' unhappyEnding
    goto checkIfNTFour

  checkIfNTFour:

    StrCmp $0 'NT 4' happyEnding

    StrCmp $MIN_WIN_VER 'NT 4' unhappyEnding
    goto checkIfNTThree

  checkIfNTThree:

    StrCmp $0 'NT 3' happyEnding ntThreeNotInstalled

    StrCmp $MIN_WIN_VER 'NT 3' unhappyEnding
    goto checkIfME

  checkIfME:

    StrCmp $0 'ME' happyEnding

    StrCmp $MIN_WIN_VER 'ME' unhappyEnding
    goto checkIfNinetyEight

  checkIfNinetyEight:

    StrCmp $0 '98' happyEnding

    StrCmp $MIN_WIN_VER '98' unhappyEnding
    goto checkIfNinetyFive

  checkIfNinetyFive:

    StrCmp $0 '95' happyEnding

  unhappyEnding:

    MessageBox MB_OK|MB_ICONEXCLAMATION "My program requires Windows $(MIN_WIN_VER) to run."
    Quit

    happyEnding:
    
FunctionEnd