用C语言,将文件以16进制的形式打印出来

方法一

void main()
{
    //读取yuv文件
    int size = 1280 * 720 * 3 / 2;
    //用来缓存原始数据
    char *buf = (char *)malloc(sizeof(char) * size);
    //用来缓存打印字符串
    char *str = (char *)malloc(sizeof(char) * size * 2);
    //初始化-一般都很重要
    memset(buf, '\0', size);
    memset(str, '\0', size * 2);
    int i,numread, j;
    if ((fp = fopen("/sdcard/cm.yuv", "rb")) != NULL)
    {
        //读取文件成功
        LOGI("open file success!!");
        numread = fread(buf, sizeof(char), size, fp);
        LOGI("fread num = %d", numread);
        for (i = 0; i < numread; ++i)
        {
            unsigned char tmp = (unsigned char)buf[i];
            //取高四位输入到格式化字符
            sprintf(str + 2 * i, "%x", (tmp & 0xF0) >> 4);
            //取低四位输入到格式化字符
            sprintf(str + 2 * i + 1, "%x", (tmp & 0x0F));
        }
        LOGI("str : %s", str);
    }
    else
    {
        LOGI("open file fail!");
    }
    free(buf);
    free(str);
    //释放文件,关闭文件
    fclose(fp);
}

方法二

void printData(void* data, const int size, const char * name)
{
    char * dt = (char *)data;
    int i,j;
    char * str = (char *) malloc(size * sizeof(char) * 2);
    memset(str, '\0', size * sizeof(char) * 2);
    for (i = 0; i < size; i++)
        {
            sprintf(str + 2 * i,"%02x", dt[i]);
        }
    LOGI_EU("%s , %s", name, str);
    free(str);
}

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