randomstring.shtml

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SHTML

124 行

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   <META NAME="Author" CONTENT="Scott Miller">
   <TITLE>Miscellaneous - RandomString</TITLE>
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<CENTER><H3><FONT COLOR="#AOAO99">
Random String
</FONT></H3></CENTER>
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<!-- Author and contact details -->
This article was contributed by <A HREF="mailto:Michael.5.0.6.3.Wild@dv-ed-sd.zug.ch.siemet.com">Mike Wild</A>.

<p>For a verification Key I needed a random string, which I was implementing like this:


<FONT COLOR="#990000"><TT><PRE>
// 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;
}
</tt></PRE></FONT>

<H4>Bugs and Improvements:</H4>
<p>Please report all bugs and improvements to me, thanks and enjoy it.


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<p>Last updated: 12 June 1998

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