${ElseIfNot}

Conditionally executes a block of statements, depending on the value of an expression. ${ElseIfNot} and ${ElseUnless} are equivalent and interchangeable, as are ${IfNot} and ${Unless}. Requires opening condition ${If} or ${IfNot}.

Syntax

${ElseIfNot} expression

The following "expressions" are available:

Standard (built-in) string tests (which are case-insensitive):
     a == b; a != b
Additional case-insensitive string tests (using System.dll):
     a S< b; a S>= b; a S> b; a S<= b
Case-sensitive string tests:
     a S== b; a S!= b
Standard (built-in) signed integer tests:
     a = b; a <> b; a < b; a >= b; a > b; a <= b
Standard (built-in) unsigned integer tests:
     a U< b; a U>= b; a U> b; a U<= b
64-bit integer tests (using System.dll):
    a L= b; a L<> b; a L< b; a L>= b; a L> b; a L<= b
Built-in NSIS flag tests:
    ${Abort}; ${Errors}; ${RebootFlag}; ${Silent}
Built-in NSIS other tests:
    ${FileExists} a
Any conditional NSIS instruction test:
    ${Cmd} a
Section flag tests:
    ${SectionIsSelected} a; ${SectionIsSectionGroup} a;
    ${SectionIsSectionGroupEnd} a; ${SectionIsBold} a;
    ${SectionIsReadOnly} a; ${SectionIsExpanded} a;
    ${SectionIsPartiallySelected} a

Examples

Check if condition is met

StrCpy $0 true

${IfNot} $0 == true
    MessageBox MB_OK "$$0 is true"
${ElseIfNot} $0 == false
    MessageBox MB_OK "$$0 isn't false"
${EndIf}

File conditions

${IfNot} ${FileExists} $SYSDIR\notepad.exe
${AndIf} ${FileExists} $EXEDIR\notepad.exe
    ; we found a copy in $EXEDIR
    Exec $EXEDIR\notepad.exe
${ElseIfNot} ${FileExists} $SYSDIR\notepad.exe
${AndIfNot} ${FileExists} $EXEDIR\notepad.exe
    MessageBox MB_OK "Could not find any notepad.exe"
${ElseIf} ${FileExists} $SYSDIR\notepad.exe
    ; we should've done that in the first place!
    Exec $SYSDIR\notepad.exe
${EndIf}

Credits

Written by dselkirk and eccles