Title, Use the Cryptography API to generate secure random numbers with Visual Basic Description, This example shows how to use the Cryptography API. Initialize the random-number generator. Randomize() ' Generate random value between 1 and 6. Dim value As Integer = CInt(Int((6 * Rnd()) + 1)). For that purpose we generate another random number by Note: XML comments in the source code were generated using "VBXC - VB. To get a random integer value between 1 and N (inclusive) you can use the following. CInt(ardanyan.deg(Rnd() * n)) + 1. VB provides a simple little function that lets you generate your own random (or as random as you can get on a PC!) numbers, called Rnd. Below.
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I had to create a piece of code that will give me random number generator visual basic 2005 set of randomly generated keys. Each key had to consist of letters and numbers, and the letters could be either randomly lowercase or uppercase. Looking at some sample code on the web, I could not find what I needed. All the examples I found either generated numbers only, or letters only.
I also wanted this random key to be based on a certain rule that made it "not straightforward" random, so, I came up with this little piece of code.
You feed it with a string of letters: KeyLettersa string of numbers: KeyNumbersand random number generator visual basic 2005 many characters you want the random key to be: We then call Generate which goes and generates a random number through the Randomize statement and the Rnd function. Multiply Rnd by -could be any number we choose which is sufficient enough to bring the value above zero.
If the resulting number is an even number, then our random character will be a letter. If we get an odd number, then our random character will be a number. To generate a random character, we generate a random index for one of the character arrays depending on what our random character will be. If we are generating a number, then that is our random character. If we are generating a letter, random number generator visual basic 2005 we need to determine whether we want it uppercase or lowercase.
For that purpose we generate another random number by multiplying the value of Rnd by 99 — could be any other number too — and then determine whether the result is even or odd. This time, we capitalize the letter if we get an odd random number generator visual basic 2005, otherwise we leave it as it is.
And so on, … the loop keeps "looping" while using, and we use a StringBuilder to construct our resulting stringuntil we've generated the desired number of characters for our Random Key. We convert the StringBuilder to String and return it with the function.
I highly recommend it. This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves.
If in doubt please contact the author via the discussion board below. Sign in Email. Forgot your password? Search within: Articles Quick Answers Messages. Comments Tagged as. Stats Laith M. Zraikat28 Jul Rate this: Please Sign up or sign in to vote.
Download demo project - 2. Using the code The way it works is as follows: Generate Console. WriteLine " Press any key to exit ToInt16 LettersArray. ToUpper End If sb. ToInt16 NumbersArray. A list of licenses authors might use can be found here.
Zraikat Web Developer. Random Number Generator Recommendations for Applications. License Key Generation. C Random String Generator. Angular 7 with. NET Core 2. Member Jul 1: Baiju Nagori May Zraikat 5-Aug 1: Shane Story 6-Feb 5: Shane Jesus loves you! John 3: Anthony Granger Feb Go to top. Article Copyright by Laith M. Article Alternatives Comments 11 Add your own alternative version Tagged as.
NET Laith M. Rate this:. Web Developer. United States. First Prev Next. Hi Laith M. Zraikat, I want to know which is the license of your code for commercial use for RandomKeyGenerator. Member Thanx afridibest Apr 1: Thanx it help me a lot Good but smiling4ever Aug 4: Append RawChars. Chars xx Next Return str. Good but Baiju Nagori May Good idea, thanks. Good but mhovidz Apr 8: Good day! Do this code do not create a duplicate value? How to create a program that can generate a string battlefield 3 multiplayer pc full version no duplicate?
Please help me. Mark Angelus V. Movida Programmer. Good but smiling4ever Apr 9: You cannot prevent duplicates. Good but Laith M. To prevent duplicates you would have to save each key you generate in a DataTable and check all subsequent keys against that DataTable to see if it exists.
Another simple way is to create a Cache object using the generated key as the "key" in the key-value pair. Then on every generation you check to see if a cache object with that key value exists. Good but Shane Story 6-Feb 5: Hey it is interesting! Thanks for the random number generator visual basic 2005. Good but Anthony Granger Feb Anthony Granger. Randomize Do: Write "Maximum length: ToInt32 Console. End Try: Write "Minimum length: Write "Amount of passwords: Next System.
WriteLine "Make sure to change your password regularly. Write it in your head, and no-where-else.