摘要：
转载自：http://qing.blog.sina.com.cn/1820422183/6c81702733001qvk.html1.c版inthexcharToInt(charc){if(c˃='0'&&c='A'&&c='a'&&c˂='f')return(c-'a'+10);return
转载自：http://qing.blog.sina.com.cn/1820422183/6c81702733001qvk.html
1.c版
int hexcharToInt(char c)
{
if (c >= '0' && c <= '9') return (c - '0');
if (c >= 'A' && c <= 'F') return (c - 'A' + 10);
if (c >= 'a' && c <= 'f') return (c - 'a' + 10);
return 0;
}
void hexstringToBytes(char* hexstring,char* bytes,int hexlength)
{
cout<<"length is :"<<sizeof(hexstring)/sizeof(char)<<endl;
for (int i=0 ; i <hexlength ; i+=2) {
bytes[i/2] = (char) ((hexcharToInt(hexstring[i]) << 4)
| hexcharToInt(hexstring[i+1]));
}
}
void bytesToHexstring(char* bytes,int bytelength,char *hexstring,int hexstrlength)
{
char str2[16] = {'0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f'};
for (int i=0,j=0;i<bytelength,j<hexstrlength;i++,j++)
{
int b;
b = 0x0f&(bytes[i]>>4);
char s1 = str2[b];
hexstring[j] = s1;
b = 0x0f & bytes[i];
char s2 = str2[b];
j++;
hexstring[j] = s2;
}
}
int main()
{
char csh[5] = {'1','2','3','4','