how to discard non alphanumeric key in a string ?

[mnemo15]

Dear all,

To start an application  that i have developped, i would like that the user write its password in the first panel but i want that each time that user enter a character in the string control Hide_Password (see attached picture), this one is automatically convert in a "." to hide the password . The real password is saved in a second string control. It is actually what my vi is doing by using a Key Up event. But now i want to prevent any non alphanumerical character to be enter in the password, especially i do not want that the user can press the menu key as <Ctrl>, <Shift>, <Alt>, <Command>, and <Option> and also the <Left>, <Up>, <Right>, <Down>. I suppose that i have to use Key Down? event by discarding all the key that i do not want but i am sure that there is a more easy way to do it.

Do you have any idea ?

Morover, If you think that there is something wrong in my vi, please let me know.

Thanks

Philippe 

[falkpl]

If you don't want the display to show the users typing, why not just use Password mode on the string control.

I might misunderstand what you are trying to achieve.

[JÞB]

Lexical Class Function   <<<Edit thats a link

but why not just set the display style to *?

EDIT: Whats with the font?

[ben64 · Accepted solution]

You can also use the string control Key Down? event and discard the event when the ascii char do not correspond to an alphanumerical character.

Ben64

[mnemo15]

Thanks for the password mode of STRING, i did not know that there is this option. It is perfect. But now i have to prevent the special key to be pressed....

[mnemo15]

Thanks Ben64,

it is exactly what i want... but not enough knowledge to do it so easily.

[jcarmody]

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The real password is saved in a second string control.

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One thing you shouldn't do is use a (hidden?) String control for data storage.  Use the one control for data input (as a password as others have suggested) and pass the data throughout your program with a wire.