C语⾔16进制与ASCII字符相互转换
1、把获取到的16进制数据转换成相同字符的ASCII字符，例：get[2] = {0x11,0x22};  →  put[4]={'1','1','2','2'}；数据的转换主要通过sprintf()；来完成的，对于该函数⽹上有许多讲解，想要了解的可以查看⼀下。
typedef unsigned char uint8_t;
char data[64];
uint8_t *hex_to_ascii(uint8_t *str, uint32_t len)
{
uint8_t *hex_buf = str;
for (int i = 0; i < len; i++)
{
sprintf(&data[i * 2], "%02X", hex_buf[i]);
}
return (uint8_t *)data;
}
2、把获取到的ASCII字符转换成相同字符的16进制，例：get[4]={'a','a','b','b'}; →  put[2] = {0xaa,0xbb}; ASCII转换成16进制主要通过sscanf()；来完成的。
typedef unsigned char uint8_t;
char data[64];
uint8_t *ascii_to_hex(char *str, uint32_t len)
{
char *str_buf = str;
uint8_t *hex = (uint8_t *)data;
uint8_t data_buf[len];
for (int i = 0; i < len; i++)
{
sscanf(str_buf, "%02x", (int *)&data_buf[i]);
str_buf += 2;
}
memcpy(hex, data_buf, len);
return hex;
}
3、把获取到的16进制转换成对应的ASCII字符，例：get[4]={'a','a','b','b'}; → put[4]={0x61,0x61,0x62,0x62}; typedef unsigned char uint8_t;
char data[64];
uint8_t *Char_to_Hex(char *str,uint32_t len)
{
char *hex_buf = str;
uint8_t *hex = (uint8_t *)data;
for (int i = 0; i < len; i++)
{
if ((hex_buf[i] >= '0') && (hex_buf[i] <= '9'))        //0x30--0x39
hex_buf[i] += 0x30;
else if ((hex_buf[i] >= 'a') && (hex_buf[i] <= 'z'))  //0x61--0x66
hex_buf[i] += 0x61;
else if ((hex_buf[i] >= 'A') && (hex_buf[i] <= 'Z'))  //0x41--0x46
hex_buf[i] += 0x41;
else
hex_buf[i] += 0xff;
}
c语言中的sprintf用法memcpy(hex, hex_buf, len);
return hex;
}
4、把获取到的ASCII转换成对应的16进制字符，例：get[4] = {0x61,0x61,0x62,0x62}; → put[4]={'a','a','b','b'}; typedef unsigned char uint8_t;
char data[64];
uint8_t *Hex_to_Char(char *str,uint32_t len)
{
char *hex_buf = str;
uint8_t *hex = (uint8_t *)data;
for (int i = 0; i < len; i++)
{
if ((hex_buf[i] >= 0x30) && (hex_buf[i] <= 0x39))      //0--9
hex_buf[i] -= 0x30;
else if ((hex_buf[i] >= 0x41) && (hex_buf[i] <= 0x46)) //A--Z
hex_buf[i] -= 0x37;
else if ((hex_buf[i] >= 0x61) && (hex_buf[i] <= 0x66)) //a--z
hex_buf[i] -= 0x57;
else
hex_buf[i] = 0xff;
}
memcpy(hex, hex_buf, len);
return hex;
}
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