Random String Generator

For a verification Key I needed a random string, which I was implementing like this:
// iType:   0 -> all syblos allowed
//          1 -> alphanumeric
//          2 -> alpha
//          3 -> numeric
CString RandomString( int iLength, int iType )
{
    CString strReturn;
    CString strLocal;

    for( int i = 0 ; i < iLength ; ++i )
    {
        int iNumber;

        // Seed the random-number generator with TickCount so that
        // the numbers will be different every time we run.
        srand( (unsigned int)( (i+1)*iLength*GetTickCount() ) );

        switch( iType )
        {
            case 1:
                iNumber = rand()%122;
                if( 48 > iNumber )
                    iNumber += 48;
                if( ( 57 < iNumber ) &&
                    ( 65 > iNumber ) )
                    iNumber += 7;
                if( ( 90 < iNumber ) &&
                    ( 97 > iNumber ) )
                    iNumber += 6;
                strReturn += (char)iNumber;
                break;
            case 2:
                iNumber = rand()%122;
                if( 65 > iNumber )
                    iNumber = 65 + iNumber%56;
                if( ( 90 < iNumber ) &&
                    ( 97 > iNumber ) )
                    iNumber += 6;
                strReturn += (char)iNumber;
                break;
            case 3:
                strLocal.Format("%i", rand()%9 );
                strReturn += strLocal;
                break;
            default:
                strReturn += (char)rand();
                break;
        }
    }

    return strReturn;
}

Bugs and Improvements:

Please report all bugs and improvements to me, thanks and enjoy it.

Last updated: 12 June 1998




Comments

  • Thank you

    Posted by rm_pkt on 03/27/2006 05:57am

    Nice code. I really enjoyed it

    Reply
Leave a Comment
  • Your email address will not be published. All fields are required.

Top White Papers and Webcasts

  • Live Event Date: August 20, 2014 @ 1:00 p.m. ET / 10:00 a.m. PT When you look at natural user interfaces as a developer, it isn't just fun and games. There are some very serious, real-world usage models of how things can help make the world a better place – things like Intel® RealSense™ technology. Check out this upcoming eSeminar and join the panel of experts, both from inside and outside of Intel, as they discuss how natural user interfaces will likely be getting adopted in a wide variety …

  • Live Event Date: August 14, 2014 @ 2:00 p.m. ET / 11:00 a.m. PT Data protection has long been considered "overhead" by many organizations in the past, many chalking it up to an insurance policy or an extended warranty you may never use. The realities of today make data protection a must-have, as we live in a data driven society. The digital assets we create, share, and collaborate with others on must be managed and protected for many purposes. Check out this upcoming eSeminar and join eVault Chief Technology …

Most Popular Programming Stories

More for Developers

Latest Developer Headlines

RSS Feeds