repuust
16th July 2008 23:43 UTC

Not equal comparison with strings
When using the LogicLib.nsh, is it just me, or can you not do "not equal" with two strings? I've tried to do something like:

${If} $DB_PWD <> $0
MessageBox MB_ICONEXCLAMATION|MB_OK "The two passwords do not match"
Abort
${EndIf}

or something similar a few times. It will never run the inner block of code, regardless of whether $DB_PWD and $0 are equal or not. I've now got these scatterered throughout my code:

${If} $DB_PWD == $0
; This is hack, because for some reason you can't do <> comparison with strings
${Else}
MessageBox MB_ICONEXCLAMATION|MB_OK "The two passwords do not match"
Abort
${EndIf}

I can't believe I'm the first to find this, but I can't find any post or help on something like this. The LogicLib.nsi sample compares integers, but not strings. Note, it works just fine with integers.

kichik
16th July 2008 23:48 UTC

<> is for numbers. Use !=.

Afrow UK
16th July 2008 23:50 UTC

Also as password checking should usually be case sensitive, you can use S!=.

Stu

repuust
17th July 2008 16:14 UTC

Thanks, worked great. Now that I know what I'm looking for, I still can't find any documentation on S!=. Any idea where this is documented so I can provide a reference to it?

LoRd_MuldeR
17th July 2008 16:20 UTC

From "Inlcudes\LogicLib.nsh"

;   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