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C++ Discussion Thread
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May 14th, 2009

->ToLower() (Mixing letters and numbers)

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I use this command to check for the Computername wich returns:

C++ Syntax (Toggle Plain Text)
SystemInformation::ComputerName->ToString();
//returns: MYCOMP-EG03R8F
SystemInformation::ComputerName->ToString();
//returns: MYCOMP-EG03R8F

When manually rightclicking "My Computer" and check what name I have, it says with lowcase letters:

mycomp-eg03r8f

So it doesn´t return the correct name. It shows Capitals.

But if I do this command instead:

C++ Syntax (Toggle Plain Text)
SystemInformation::ComputerName->ToLower()->ToString();
SystemInformation::ComputerName->ToLower()->ToString();

I do get the same computername:

mycomp-eg03r8f

Is it okay to use ->ToLower() when it is a mix with letters and numbers. The function is intelligent and separates letters from numbers ?

Thank you if someone can confirm that...

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Liszt

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Junior Poster

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May 14th, 2009

Re: ->ToLower() (Mixing letters and numbers)

Judging by the fact that you got the expected output, and not an error, it seems like a safe assumption, doesn't it? If you're concerned about it, run some tests on varying inputs. You'll probably find that it works fine. My guess is that the toLower() function uses the ASCII table to verify that something is a letter and acts appropriately (there are plenty of symbols that aren't letters OR numbers). Also, are you sure you can't look at the function's code yourself, by looking in some standard library?

BestJewSinceJC

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Posting Maven

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May 15th, 2009

Re: ->ToLower() (Mixing letters and numbers)

See also ToLowerInvariant() function:
http://msdn.microsoft.com/en-us/libr...invariant.aspx.
MS recommends ToLowerInvariant for OS identifiers (file names, registry keys etc)...

ArkM

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Postaholic

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May 15th, 2009

Re: ->ToLower() (Mixing letters and numbers)

thank you ArkM, I thought of that perheps can be a scenario that I haven´t thought about. I red about the ToLowerInvariant() and it seems to be the right approach for this purpose.

Click to Expand / Collapse Quote originally posted by ArkM ...

See also ToLowerInvariant() function:
http://msdn.microsoft.com/en-us/libr...invariant.aspx.
MS recommends ToLowerInvariant for OS identifiers (file names, registry keys etc)...

Liszt

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