C语言实现字节流与十六进制字符串的相互转换-蒲公英云

C语言实现字节流与十六进制字符串的相互转换

青旅半醒 2022-05-19 05:15 310阅读 0赞

在调试串口经常碰到需要把读出来的hex data转化成string类型输出,记录下来

//字节流转换为十六进制字符串
//itoa,16进制变字符串,1字节变两字节

void ByteToHexStr(const unsigned char* source, char* dest, int sourceLen)
{
    short i;
    unsigned char highByte, lowByte;
    for (i = 0; i < sourceLen; i++)
    {
        highByte = source[i] >> 4;
        lowByte = source[i] & 0x0f ;
        highByte += 0x30;
        if (highByte > 0x39)
                dest[i * 2] = highByte + 0x07;
        else
                dest[i * 2] = highByte;
        lowByte += 0x30;
        if (lowByte > 0x39)
            dest[i * 2 + 1] = lowByte + 0x07;
        else
            dest[i * 2 + 1] = lowByte;
    }
    return ;
}

//字节流转换为十六进制字符串的另一种实现方式

void Hex2Str( const char *sSrc,  char *sDest, int nSrcLen )
{
    int  i;
    char szTmp[3];
    for( i = 0; i < nSrcLen; i++ )
    {
        sprintf( szTmp, "%02X", (unsigned char) sSrc[i] );
        memcpy( &sDest[i * 2], szTmp, 2 );
    }
    return ;
}

//十六进制字符串转换为字节流
//atoi,2个字符串字符变一个十六进制字节

void HexStrToByte(const char* source, unsigned char* dest, int sourceLen)
{
    short i;
    unsigned char highByte, lowByte;
    for (i = 0; i < sourceLen; i += 2)
    {
        highByte = toupper(source[i]);
        lowByte  = toupper(source[i + 1]);
        if (highByte > 0x39)
            highByte -= 0x37;
        else
            highByte -= 0x30;
        if (lowByte > 0x39)
            lowByte -= 0x37;
        else
            lowByte -= 0x30;
        dest[i / 2] = (highByte << 4) | lowByte;
    }
    return ;
}
int main()
{
    //char data[] = {0xFF,0x26,0xA0,0x0B,0xFF};
    char data[] = "FF26A00BFF12";
    char buffer[100];
    char i=0;
    memset(buffer, 0, sizeof(buffer));
    //ByteToHexStr(data, buffer, sizeof(data));
    //Hex2Str(data, buffer, sizeof(data));
    //printf("convert after:%d, %02x\n", strlen(buffer),buffer[i]); 
    HexStrToByte(data,buffer,strlen(data));
    for(i=0;i<(strlen(data)/2);i++)
    {
        printf("convert after:%d, %02x\n", strlen(buffer),buffer[i]); 
    }
}