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;
    }
    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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