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void RandomString(char *dst,int len,BOOL Gen_Numbers)
{
	int i=0,randn=0;
	
	srand(GetTickCount()); // init random number generator

	do
	{
		randn=(rand() % 90); // gen random number between 0 ~ 90

		if(randn<30 && i!=0 && Gen_Numbers==TRUE)
			dst[i]=(48 + (rand() % 9));		//gen number
		else if(randn<60)
			dst[i]=(98 + (rand() % 24));	//gen lower case letter
		else if(randn>60)
			dst[i]=(66 + (rand() % 24));	//gen upper case letter

		i++;
		len--;

	}while(len!=0);

	dst[i]=NULL;
}