Hi,
I have a chunk of script which ckecks whether there are 4 GB available on target drive:
Set Variable TARGETDRIVE to $TARGETDIR$
Extract Parent Drive: TARGETDRIVE
Set Variable FREE_SPACE to 0
Get Free Space on $TARGETDRIVE$ into variable FREE_SPACE
if Variable FREE_SPACE not Greater Than 4000000000
MessageBox: $TITLE$ Setup Error, This installation requires at least 4 GB of available disk space in $TARGETDRIVE$. Please, free some disk space and run the installation again.$NEWLINE$$NEWLINE$Setup cannot continue.
Terminate Installation
end
The available free space is obtained ok, but when the comparison is performed, it is a STRING comparison and not a NUMERIC one, although both variables contain numbers (the help says in this case a numeric comparison is performed). So if the drive contains only 41 bytes free, the script passes the test because '41' is lexicographically after '4000000000'.
What to do?
String comparison instead of numeric
Solved, using "Mathematics":
Get Free Space on $TARGETDRIVE$ into variable FREE_SPACE
ENOUGH_SPACE = $FREE_SPACE$ / 4000000000
if Variable ENOUGH_SPACE Equals 0
MessageBox: $TITLE$ Setup Error, This installation requires at least 4 GB of available disk space in $TARGETDRIVE$. Please, free some disk space and run the installation again.$NEWLINE$$NEWLINE$Setup cannot continue.
Terminate Installation
end
Get Free Space on $TARGETDRIVE$ into variable FREE_SPACE
ENOUGH_SPACE = $FREE_SPACE$ / 4000000000
if Variable ENOUGH_SPACE Equals 0
MessageBox: $TITLE$ Setup Error, This installation requires at least 4 GB of available disk space in $TARGETDRIVE$. Please, free some disk space and run the installation again.$NEWLINE$$NEWLINE$Setup cannot continue.
Terminate Installation
end