How to discard non alphanumeric key in a string ?

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
Solved!
Go to Solution.
Attachments:
FrontPanel.png ‏12 KB
BlockDiagram.png ‏43 KB

The real password is saved in a second string control.
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.
Jim
You're entirely bonkers. But I'll tell you a secret. All the best people are. ~ Alice

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Solved!
Go to Solution.

On the left side of the for loop there are two arrays. The first array is empty and used to initialize the shift register.
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How to discard non alphanumeric key in a string ?

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