How to trim trailing blanks from a string

[FlexeraFan]

1.)How can I trim trailing blanks from a string? I need to check if a string is empty. If it is not then I need to perform an action.

Example:  hString = "                        ";

2.)Is there a single command which will trim trailing blanks? Also what if someone enters a tab and it is saved in the string? How would I ignore tab characters?

[banna_k]

Hi @FlexeraFan,
See the previous thread related to almost your query on string:
https://community.flexera.com/t5/InstallShield-Forum/Remove-Spaces-from-string-with-Installscript/m-p/40185

https://helpnet.flexerasoftware.com/installshield21helplib/Subsystems/installshield21langref/helplibrary/LangrefString_functions.htm

[Varaprasad]

There is no built-in method to remove trailing spaces alone. You can use StrTrim to remove both the leading and trailing spaces and tabs from a string

or

You can write your own method as your requirement. You can find example here.

https://community.flexera.com/t5/InstallShield-Knowledge-Base/String-Indexing-Example/ta-p/4526

[ralphster]

I tried using StrTrim but I am getting an error message :  "string value required". Does anyone have any idea why this is happening?

string exampleString = "          ";
exampleString = StrTrim(exampleString ); // Gives compile error message "string value required".

[Varaprasad · Accepted solution]

StrTrim does not return string, hence modify

         exampleString = StrTrim(exampleString );

to

        StrTrim(exampleString ); // exampleString passed as reference, hence changes will be reflected  back

You can refer below link for return values of StrTrim method

https://helpnet.flexerasoftware.com/installshield22helplib/Subsystems/installshield22langref/helplibrary/StrTrim.htm?