C语言16进制与ASCII字符相互转换 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'};
【C语言16进制与ASCII字符相互转换】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--0x39hex_buf[i] += 0x30; else if ((hex_buf[i] >= 'a') && (hex_buf[i] <= 'z'))//0x61--0x66hex_buf[i] += 0x61; else if ((hex_buf[i] >= 'A') && (hex_buf[i] <= 'Z'))//0x41--0x46hex_buf[i] += 0x41; elsehex_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--9hex_buf[i] -= 0x30; else if ((hex_buf[i] >= 0x41) && (hex_buf[i] <= 0x46)) //A--Zhex_buf[i] -= 0x37; else if ((hex_buf[i] >= 0x61) && (hex_buf[i] <= 0x66)) //a--zhex_buf[i] -= 0x57; elsehex_buf[i] = 0xff; }memcpy(hex, hex_buf, len); return hex; }

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