I am new to delphi. I have a problem. I have a string which can be of any length. Sometimes with delimiter characters for printing in new line.
Now I need to distinguish whether the received string is a number (both -ve and +ve) or any other alpha numeric value. Based on that I need to proceed further.
Any built in function to check this? or how to parse and find out its a number?
I'm not good in delphi...but I want to help you
I looked for you problem on the web,and there was a good idea for your problem.They say:Try to convert that string into number.The StrToIntDef takes an extra argument that is returned, if the string could not be converted to int successfully.
By the way, I had not known about the StrToIntDef function until reading this thread. I checked with Help in my copy of Delphi 6, which is where I have learned most of my Delphi programming, and it did not list it. Then I looked in SysUtils.pas and found it, along with some other nice functions I wish I had known about, such as:
function StrToFloatDef(const S: string; const Default: Extended): Extended;
function TryStrToFloat(const S: string; out Value: Extended): Boolean;
I'll be digging around in there a bit more for other things I have missed, like the string-to-int function that converts strings, including hex-formatted strings, to integers.
Hello, thanks for the replies. I have a text (Widestring). Which need to be checked (no need or converting it ), if its a float or not. When I tried TexttoFloat, the program behaves worgly. No proper ending of the method.
and I see all the text ends with #0 . should I remove this trailing #0 ?