#include <stdio.h>
#include <string.h>

typedef unsigned long DWORD;

// 函數(shù)功能：16進制字符串轉化為數(shù)字
// 函數(shù)返回：0不是16進制數(shù)，1是十六進制數(shù)
bool HexstrToHex(char *str, DWORD &dwVal)
{
?int??nLen;
?int??i;
?int??pow;
?DWORD?s;
?char?ch;???
?char?*p;

?nLen = strlen(str);
?p = str + nLen;

?if (nLen > 8 || nLen == 0)
??return false;

?s = 0;
?pow = 1;
?for(i = nLen; i > 0; i --)
?{
??ch = *(--p);

??if ((ch >= 'a') && (ch <= 'f'))
???ch = ch - 'a' + 10;
??else if ((ch >= 'A') && (ch <= 'F'))
???ch = ch -? 'A' + 10;
??else if ((ch >= '0') && (ch <= '9'))
???ch = ch - '0';
??else
???return false;

??s += ch * pow;
??pow *= 16;
?}

?dwVal = s;
?return 1;
}

void main()
{
?char?str[] = "a0";
?DWORD?dwVal;

?if (!HexstrToHex(str, dwVal))
??printf("failed./n");
?else
??printf("%x/n", dwVal);
}