十六进制元素数组与字符串相互转换（C语言）

短命女 2023-06-27 03:52 58阅读 0赞

## 0x00 前言 ##

文章中的文字可能存在语法错误以及标点错误，请谅解；

如果在文章中发现代码错误或其它问题请告知，感谢！

## 0x01 字符串化成十六进制数组 ##

将十六进制的数组转化成同样值的字符串函数如下：

int StringToBuff(char *str,unsigned char *OutputBuff)
    { 
    	char *p = NULL;
    	char High = 0;
    	char Low = 0;
    	int i = 0;
    	int Len = 0;
    	int count = 0;
    	
    	p = str;
    	Len = strlen(p);
    
    	while(count < (Len/2))
        { 
            High = ((*p > '9') && ((*p <= 'F') || (*p <= 'f')))?*p - 48 - 7 : *p - 48;
    		Low = (*(++ p) > '9' && ((*p <= 'F') || (*p <= 'f')))? *p - 48 - 7 : *p - 48;
            OutputBuff[count] = ((High & 0x0f) << 4 | (Low & 0x0f));
            p ++;
            count ++;
        }
    	//判断字符串长度是否为奇数
    	if(0 != Len%2)
    	{ 
    		OutputBuff[count++] = ((*p >'9')&&(*p<='F')||(*p<='f'))?*p-48-7:*p-48;
    	}
    	
    	return Len/2 + Len%2;
    }

## 0x02 十六进制数组转化成字符串 ##

int ArrayToStr(unsigned char *Buff, unsigned int BuffLen, char *OutputStr)
    { 
    	int i = 0;
    	char TempBuff[128] = { 0};
    	char strBuff[256] = { 0};
    	
    	for(i = 0; i<BuffLen;i++)
    	{ 
    		sprintf(TempBuff,"%02x",Buff[i]);//以十六进制格式输出到TempBuff，宽度为2
    		strncat(strBuff,TempBuff,BuffLen*2);//将TempBuff追加到strBuff结尾
    	}
    	strncpy(OutputStr, strBuff, BuffLen*2); //将strBuff复制到OutputStr
    	return BuffLen*2;
    }

## 0x03 举例 ##

#include "stdio.h"
    #include "stdlib.h"
    #include "string.h"
    unsigned char ArrayHex[16] = { 0x1a, 0x2b, 0x3c, 0x4d, 0x5e, 0x6f, 0x7b, 0x8d, 0x9e, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16};
    
    char *strCom = "1a2b3c4d5e6f7a8b9c1011121314";
     
    int main(int argc, const char *argv)
    { 
        int i= 0;
        int outlen = 0;
        char str[33] = { 0};
        unsigned char out[33] = { 0};
        
        ArrayToStr(ArrayHex, 16, str);   
        printf("after ArrayToStr :%s\n",str);
        
        outlen = StringToBuff(strCom, out);
        printf("after StringToBuff\n");
        for(i= 0; i< outlen; i++)
        { 
            printf("%02X ", out[i]);
        } 
    	printf("\n");
    
        return 0;
    }

以上。

参考文档：  
[https://blog.csdn.net/zhemingbuhao/article/details/83111564][https_blog.csdn.net_zhemingbuhao_article_details_83111564]

[https_blog.csdn.net_zhemingbuhao_article_details_83111564]: https://blog.csdn.net/zhemingbuhao/article/details/83111564