学习笔记：char存储的十六进制数据和其它数据类型的转换

来源：互联网发布：怎么弄大批量淘宝号编辑：程序博客网时间：2024/05/16 05:06

最近做的东西涉及到从读取char数组中存放的十六进制数，每个char数据的码型（ASCII,BCD,FLOAT,HEX）不一样。需要进行对应数据类型的转换。实现如下：

string DataTrans::Char2BCD(unsigned char *c,int len){              char s[100];       char c1,c2;       string str="";       for(int i=0;i<len;i++)       {       c1= c[i]&0x0f;     c2= c[i]>>4;       int n=(int)(((c2&0x08+c2&0x04+c2&0x02+c2&0x01)<<4)+(c1&0x08+c1&0x04+c1&0x02+c1&0x01));       if(n<=9&&n>=0)       {         str+="0";       }       str+=itoa(n,s,10);       }       return str;}void  DataTrans::Char2BYTE(unsigned char c, unsigned char *s){     for(int i=7;i>=0;i--)     {          s[i]=c&0x01;          c = c>>1;     }   }float DataTrans::Char2Float(unsigned char *cp){      return *(float *)cp;}string DataTrans::Char2Hex(char a1){    string str = "";    //int n = (a1<<8)+a2;int n=a1;    for (int i=2*sizeof(char) - 1; i>=0; i--)    {        str += "0123456789ABCDEF"[((n >> i*4) & 0xF)];    }    return str;}int  DataTrans::Hex2Oct(unsigned  char c1, unsigned  char c2){return (int)(c1<<8)+(int)c2;}