Conditionally executes a block of statements, depending on the value of an expression. Requires opening condition ${If} or ${IfNot}.
${ElseIf} 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 Check if condition is met
StrCpy $0 true
${If} $0 == true
MessageBox MB_OK "It's true"
${ElseIf} $0 == pie
MessageBox MB_OK "$0 will never be a pie"
${EndIf} Integer tests
${If} 1 > 0
MessageBox MB_OK "1 is greater than 0"
${ElseIf} 1 < 0
MessageBox MB_OK "1 will never be smaller than 0"
${EndIf} File conditions
${If} ${FileExists} $SYSDIR\notepad.exe
Exec $SYSDIR\notepad.exe
${ElseIf} ${FileExists} $EXEDIR\notepad.exe
Exec $EXEDIR\notepad.exe
${Else}
MessageBox MB_OK "Could not find notepad.exe"
${EndIf} Section test
Section "My Section" mySection
MessageBox MB_OK "Executing section"
${If} ${SectionIsSelected} ${mySection}
${AndIf} ${SectionIsReadOnly} ${mySection}
MessageBox MB_OK "Ready-only section was selected"
${ElseIf} ${SectionIsReadOnly} ${mySection}
${AndIfNot} ${SectionIsSelected} ${mySection}
MessageBox MB_OK "This will never show, dummy!"
${EndIf}
SectionEnd
Written by dselkirk and eccles