修改函数原型，确保每次malloc后可以释放堆控件

char * HexToString(char *str,unsigned char Hex[],unsigned char lenth)
{unsigned char i=0,j=0;unsigned char tema,temp;//char *str=(char*)malloc(lenth*2);for(i=0;i<lenth;i++){tema=(Hex[i]>>4)&0x0F;str[j]=IntToStr(tema);j++;temp=Hex[i]&0x0F;str[j]=IntToStr(temp);j++;}str[j]='\0';return str;
}

<pre name="code" class="cpp">char *strH=(char*)malloc(4*2);QByteArray macStr=HexToString(strH,addrC,4);if(strH!=NULL)free(strH);

今天做东西要用这个，读出来的ID号是16进制的，但是返回给上层的是字符串，LINUX下的底层函数想不到。比如unsigned char temp[10]={0xAB,0XAB,0XAB,0XAB,0XDB,0XEB,0XAB,0XAC,0XAC,0xee};我要输出的就是这样子，底层传上来的不是ASCII码。蛋痛得很`其他资料也没找到，本来想用sprintf函数的。可是完全不对头。后面已经写了这个功能函数。

# include <stdlib.h>#define DATA_LENGTH 20

//函 数 名：StrToInt()
//功能描述：把字符转换成对应的数字，比如a转换成10
char StrToInt(char aChar)
{char ss;switch(aChar){case '0': ss= 0;break;case '1': ss= 1;break;case '2': ss= 2;break;case '3': ss= 3;break;case '4': ss= 4;break;case '5': ss= 5;break;case '6': ss= 6;break;case '7': ss= 7;break;case '8': ss= 8;break;case '9': ss= 9;break;case 'A': ss= 10;break;case 'B': ss= 11;break;case 'C': ss= 12;break;case 'D': ss= 13;break;case 'E': ss= 14;break;case 'F': ss= 15;break;default:break;}//printf("%c\n",ss);return ss;
}

//函 数 名：HexToAsc()
//功能描述：把16进制转换为ASCII
char IntToStr(unsigned char aChar){char ss;switch(aChar){case 0: ss= '0';break;case 1: ss= '1';break;case 2: ss= '2';break;case 3: ss= '3';break;case 4: ss= '4';break;case 5: ss= '5';break;case 6: ss= '6';break;case 7: ss= '7';break;case 8: ss= '8';break;case 9: ss= '9';break;case 10: ss= 'A';break;case 11: ss= 'B';break;case 12: ss= 'C';break;case 13: ss= 'D';break;case 14: ss= 'E';break;case 15: ss= 'F';break;default:break;}//printf("%c\n",ss);return ss; 
} 
char * HexToString(unsigned char Hex[],unsigned char lenth)
{unsigned char i=0,j=0;unsigned char tema,temp;char *str=(char*)malloc(lenth*2);printf("Large:-----%d\n",lenth*2);for(i=0;i<lenth;i++){tema=(Hex[i]>>4)&0x0F;printf("%d\n",tema);str[j]=IntToStr(tema);printf("i=%d, %c\n",i,str[j]);j++;temp=Hex[i]&0x0F;printf("%d\n",temp);str[j]=IntToStr(temp);printf("i=%d, %c\n",i,str[j]);j++;}str[j]='\0';printf("Large:--j=%d\n",j);for(i=0;i<lenth*2;i++){printf("kkkkk:i=%d  ;str[i]:%c\n",i,str[i]);}printf("wqf:%s\n",str);return str;
}void main()
{char *str=NULL;unsigned char temp[10]={0xAB,0XAB,0XAB,0XAB,0XDB,0XEB,0XAB,0XAC,0XAC,0xee};str=HexToString(temp,10);printf("%s\n",str);
}