如何把字符串内容转换为ASCII赋给字符

Question

CString aa=“31”,bb=“32”;
char n=XXX(aa) // 则n=1; 即31作为ASCII码赋给了n
char n1=XXX(bb); //则n=2

Answer 1

先转化为 int，再 (char) aa

Answer 2

char XXX(CString& Str)
{
char ret = 0;
char *pStr=Str.GetBuffer(20);
sscanf(pStr,"%x",&ret);
Str.ReleaseBuffer();
return ret;
}CString aa="31",bb="32"; 
char n=XXX(aa); // 则n=1; 即31作为ASCII码赋给了n 
char n1=XXX(bb); //则n=2

Answer 3

char buffer[10];
buffer=aa.GetBuffer();
char n =(char)atoi(buffer);