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,鼻音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,0情人节卡片留言xbb};

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;        el if ((hex_buf[i] >= 'a') && (hex_buf[i] <= 'z'))   //0x61--0x66            hex_buf[i] += 0x61;        el if ((hex_buf[i] >= 'a') && (hex_buf[i] <= '光明与磊落z'))   //0x41--0x46            hex_buf[i] += 0x41;        el            hex_buf[i] += 0xff;    }  大学生交流  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--9hex_buf[i] -= 0x30;el if ((hex_buf[i] >= 0x41) && (hex_buf[i] <= 0x46)) //a--zhex_buf[i] -= 0x37;el if ((hex_bu高校贷款f[i] >= 0x61) && (hex_buf[i] <= 0x66)) //a--zhex_buf[i] -= 0x57;elhex_buf[i] = 0xff;    }    memcpy(hex, hex_buf, len);     return hex;}

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