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July 2nd, 2011, 04:41 AM
#1
Random string generation not working fine?
Hi all,
i m generating a random string,but its give same result when i generate these.
means i generate 5 different string than each and every time these 5 string are same as previously generated.
Code:
CString Generate_Str()
{
int m_iLength=5;
BOOL m_bLowercase=true;
BOOL m_bNumbers=true;
BOOL m_bSymbols=false;
BOOL m_bUppercase=true;
CString String="";
int gen_len;
CString pword="";
char possibles[77] = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!@#$%^&*()-+.,";
for ( gen_len=0; gen_len < m_iLength; gen_len++ )
{
int todo;
bool decided = false;
do
{
int rand_me;
rand_me = rand() % 4;
if ( (rand_me == 0) && (m_bLowercase == TRUE) ){
todo = 0;
decided = TRUE;
}
if ( (rand_me == 1) && (m_bUppercase == TRUE) ){
todo = 1;
decided = TRUE;
}
if ( (rand_me == 2) && (m_bNumbers == TRUE) ){
todo = 2;
decided = TRUE;
}
if ( (rand_me == 3) && (m_bSymbols == TRUE) ){
todo = 3;
decided = TRUE;
}
}while ( decided != TRUE );
char value='a';
switch (todo)
{
case 0 :
//Lower Letters
value = possibles[ (rand() % 26) ];
break;
case 1 :
//Cap Letters
value = possibles[ (rand() % 26) + 26 ];
break;
case 2 :
//Numbers
value = possibles[ (rand() % 10) + 52 ];
break;
case 3 :
//Symbols
value = possibles[ (rand() % 14) + 63 ];
break;
default:
break;
}
pword = pword + value;
String= pword;
return String;
}
//Alwayz give this
//=================
HOU84
NFX7V
CGIK1
9F33K
PEGRV
i want each time generate a new and different string.
please help me for this.
thanks in advance.
IN A DAY, WHEN YOU DON'T COME ACROSS ANY PROBLEMS - YOU CAN BE SURE THAT YOU ARE TRAVELLING IN A WRONG PATH
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July 2nd, 2011, 04:49 AM
#2
Re: Random string generation not working fine?
have you used srand() at the top of the program?
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July 2nd, 2011, 07:44 AM
#3
Re: Random string generation not working fine?
Also please note that rand() isn't really suitable for cryptographic purposes (unless it's toy cryptography) what it looks like you want to use it for. There are better alternatives both in the Windows API (IIRC) and the C++0x standard library extensions.
I was thrown out of college for cheating on the metaphysics exam; I looked into the soul of the boy sitting next to me.
This is a snakeskin jacket! And for me it's a symbol of my individuality, and my belief... in personal freedom.
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