How do I check whether a string exists in an array?
As you have found you can't check for a String in an Array of String, using in.
You could use this function instead of the if statement.
function StrInArray(const Value : String;const ArrayOfString : Array of String) : Boolean;var Loop : String;begin for Loop in ArrayOfString do begin if Value = Loop then begin Exit(true); end; end; result := false;end;You can call it like this.
if StrInArray(ExtString,Extensions) then
The StrUtils.pas has this already defined.
function MatchStr(const AText: string; const AValues: array of string): Boolean;
You can use the funcions IndexStr (case sensitive) or IndexText (case insensitive) from System.StrUtils to find the string inside the array and retrive the index.
var ExtString: string;const Extensions : array[0..4] of string = ('.rar', '.zip', '.doc', '.jpg', '.gif');begin if (IndexStr(ExtString, Extensions) <> -1) then ShowMessage('Finded') else ShowMessage('Not finded');