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//产生长度为length的随机字符串
char pSymbol[] = {'~','`','!','@','#','$','%','^','&',
'*','(',')','_','+','-','=','{','}','|','[',']',
':',';','<','>','?',
',','.','"','\',''','/'};
char* getRandomString(int length)
{
int nRand, i;
char* string;
srand((unsigned) time(NULL ));
if ((string = (char*) malloc(length + 1)) == NULL )
return NULL ;
for (i = 0; i < length - 1; i++)
{
nRand = rand() % (sizeof(pSymbol) + 26 * 2 + 10);
if (nRand >= 0)
{
if (nRand < 26)
string[i] = 'A' + nRand;
else if (nRand < 52)
string[i] = 'a' + nRand - 26;
else if (nRand < 62)
string[i] = '1' + nRand - 52;
else if(nRand - 62 < sizeof(pSymbol))
string[i] = pSymbol[nRand - 62];
else
string[i] = 'x';
}
else
string[i] = 'x';
}
string[length] = '
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