这段代码什么意思

[wmtty]

int CUtil::Str2Num(CString str)
{
int num,len, shift;
int temp;

num = temp = 0;
len = str.GetLength();

for ( int i=0; i<len; i++ )
{
shift = len-i-1;
temp = str[i];

if (temp>='0' && temp <='9')
{
temp -= '0';
}
else if (temp>='A'&&temp<='F')
{
temp -= 0x37;
}
else
{
return 0;
}

while(shift--)
{
temp = temp <<4;
}

num += temp;
}

return num;

}

[Red_angelX]

把字符串转成数字

[wmtty]

准确一定,把字符串转化成数字不需要着麻烦吧!