C/C++

KS3 SDK For C/C++使用指南

说明

文档中的示例代码仅供参考使用，具体使用时请参考KS3 API文档，根据自己的实际情况调节参数。

1. 概述

该SDK适用于Linux/Windows环境下C/C++版本，基于KS3 API 构建。

2. 安装

2.1 下载源码

• 点击下载

2.2 安装依赖

yum -y install libcurl-devel libxml2-devel openssl-devel

2.3 安装C SDK

• 进入C SDK目录。

cd ks3-c-sdk-master/ks3sdk_c

• 执行make命令进行编译，执行make install命令进行安装。

make 
make install

注：安装后的库文件和头文件分别存放在ks3-c-sdk-master/lib和ks3-c-sdk-master/include文件夹中。

• 进入C命令行工具目录，并执行make命令，可编译C SDK命令行工具。

cd ks3-c-sdk-master/tools
make

2.4 安装C++ SDK

• 进入C++ SDK目录。

cd ks3-c-sdk-master/sdk_c++

• 执行make命令进行编译。

make 

• 进入C++命令行工具目录，并执行make命令，可编译C++ SDK命令行工具。

cd ks3-c-sdk-master/sdk_c++/tools
make

3. 初始化

3.1 获取密钥

1. 开通KS3服务，注册账号。
2. 进入KS3控制台， 获取AccessKeyID 、AccessKeySecret。

3.2 常用术语介绍

Object（对象，文件）

在KS3中，用户操作的基本数据单元是Object。单个Object允许存储0~48.8TB的数据。 Object 包含Key和Data。其中，Key是Object的名字；Data是Object 的数据。Key为UTF-8编码，且编码后的长度不得超过1024个字符。

Key（文件名）

即Object的名字，Key为UTF-8编码，且编码后的长度不得超过1024个字符。Key中可以带有斜杠，当Key中带有斜杠的时候，将会自动在控制台里组织成目录结构。

更多术语介绍请参考文档：概念与术语。

4. 快速入门

• 请先阅读文档：常用概念术语文档。

• 常见示例请参考源码中example.c文件。

4.1 创建一个Bucket

const char* host = "ks3-cn-beijing.ksyuncs.com";
const char* bucket = "YOUR_BUCKET";
    const char* ak = "YOUR_ACCESS_KEY";
    const char* sk = "YOUR_SECRET_KEY";

int error;
buffer* resp = NULL;

resp = create_bucket(host, bucket, ak, sk, NULL, &error);
if (error != 0) {
    printf("curl err=%d\n", error);
} else {
    printf("status code=%d\n", resp->status_code);
    printf("status msg=%s\n", resp->status_msg);
    if (resp->body != NULL) {
        printf("error msg=%s\n", resp->body);
    }
}
buffer_free(resp);

4.2 删除一个Bucket

const char* host = "ks3-cn-beijing.ksyuncs.com";
const char* bucket = "YOUR_BUCKET";
    const char* ak = "YOUR_ACCESS_KEY";
    const char* sk = "YOUR_SECRET_KEY";

int error;
buffer* resp = NULL;

resp = delete_bucket(host, bucket, ak, sk, NULL, &error);
if (error != 0) {
    printf("curl err=%d\n", error);
} else {
    printf("status code=%d\n", resp->status_code);
    printf("status msg=%s\n", resp->status_msg);
    if (resp->body != NULL) {
        printf("error msg=%s\n", resp->body);
    }
}
buffer_free(resp);

4.3 列出用户所有空间

const char* host = "ks3-cn-beijing.ksyuncs.com";
const char* ak = "YOUR_ACCESS_KEY";
const char* sk = "YOUR_SECRET_KEY";

int error;
buffer* resp = NULL;

resp = list_all_bucket(host, ak, sk, &error);
if (error != 0) {
    printf("curl err=%d\n", error);
} else {
    printf("status code=%d\n", resp->status_code);
    printf("status msg=%s\n", resp->status_msg);
    if (resp->body != NULL) {
        printf("error msg=%s\n", resp->body);
    }
}
buffer_free(resp);

4.4 上传文件

const char* host = "ks3-cn-beijing.ksyuncs.com";
const char* bucket = "YOUR_BUCKET";
const char* object_key = "YOUR_OBJECT_KEY";
const char* filename = "LOCAL_DISK_FILE_PATH";
const char* ak = "YOUR_ACCESS_KEY";
const char* sk = "YOUR_SECRET_KEY";
const char* headers = "x-kss-acl:public-read";

int error;
buffer* resp = NULL;

resp = upload_file_object(host, bucket,
    object_key, filename, ak, sk, NULL, headers, &error);
if (error != 0) {
    printf("curl err=%d\n", error);
} else {
    printf("status code=%d\n", resp->status_code);
    printf("status msg=%s\n", resp->status_msg);
    if (resp->body != NULL) {
        printf("error msg=%s\n", resp->body);
    }
}
buffer_free(resp);

4.5 分块上传

4.5.1 初始化分块上传

const char* host = "ks3-cn-beijing.ksyuncs.com";
const char* bucket = "YOUR_BUCKET";
const char* object_key = "YOUR_OBJECT_KEY";
const char* ak = "YOUR_ACCESS_KEY";
const char* sk = "YOUR_SECRET_KEY";
const char* headers = "x-kss-acl:public-read";

int error;
buffer* resp = NULL;

resp = init_multipart_upload(host, bucket, object_key, ak, sk, NULL, headers, &error);
if (error != 0) {
    printf("curl err=%d\n", error);
} else {
    printf("status code = %ld\n", resp->status_code);
    printf("status msg = %s\n", resp->status_msg);
    if (resp->body != NULL) {
       printf("error msg = %s\n", resp->body);
    }
}
buffer_free(resp);

// 从response body中解析出uploadid:
char uploadid_str[128];
char *oid_beg_ptr = strstr(resp->body, "<UploadId>");
if (oid_beg_ptr) {
   oid_beg_ptr += strlen("<UploadId>");
   char *oid_end_ptr = strstr(oid_beg_ptr, "</UploadId>");
   if (oid_end_ptr) {
      strncpy(uploadid_str, oid_beg_ptr, oid_end_ptr - oid_beg_ptr);
      uploadid_str[oid_end_ptr - oid_beg_ptr] = 0;
  }
}

4.5.2 上传分块数据

char* data_buf = "hello world";
int data_len = strlen(data_buf);
int partNumber = 1;
resp = upload_part(host, bucket, object_key, ak, sk,
uploadid_str, partNumber, data_buf, data_len, NULL, NULL, &error);
if (error != 0) {
   printf("curl err=%d\n", error);
} else {
   printf("status code = %ld\n", resp->status_code);
   printf("status msg = %s\n", resp->status_msg);
   if (resp->body != NULL) {
      printf("error msg = %s\n", resp->body);
   }
}
buffer_free(resp);

4.5.3 完成分块上传

// 构造request body （如下是一块的例子，如果多块，则Part部分重复拼接多次）
snprintf(com_xml, sizeof(com_xml), "<CompleteMultipartUpload>\n"
           "<Part>\n"
           "<PartNumber>%d</PartNumber>\n"
           "<ETag>\"%.*s\"</ETag>"
           "</Part>\n</CompleteMultipartUpload>",
           1, 32, etag_ptr);

resp = complete_multipart_upload(host, bucket, object_key, ak, sk,
uploadid_str, com_xml, strlen(com_xml), NULL, NULL, &error);
if (error != 0) {
   printf("curl err=%d\n", error);
} else {
   printf("status code = %ld\n", resp->status_code);
   printf("status msg = %s\n", resp->status_msg);
   if (resp->body != NULL) {
     printf("error msg = %s\n", resp->body);
   }
}
buffer_free(resp);

4.5.4 列举已经上传的块

resp = list_multipart_uploads(host, bucket, ak, sk, uploadid_str, NULL, NULL, &error);
if (error != 0) {
   printf("curl err=%d\n", error);
} else {
   printf("status code = %ld\n", resp->status_code);
   printf("status msg = %s\n", resp->status_msg);
   if (resp->body != NULL) {
      printf("error msg = %s\n", resp->body);
   }
}
buffer_free(resp);

4.5.5 取消分块上传

resp = abort_multipart_upload(host, bucket, object_key, ak, sk, uploadId, NULL, NULL, &error);
if (error != 0) {
   printf("curl err=%d\n", error);
} else {
   printf("status code = %ld\n", resp->status_code);
   printf("status msg = %s\n", resp->status_msg);
   if (resp->body != NULL) {
      printf("error msg = %s\n", resp->body);
   }
}
buffer_free(resp);

4.6 带Header上传文件

注意：Header之间要以’\n’分隔。

const char* headers = "x-kss-acl:public-read\nx-kss-callbackurl:http://www.callbackurl.com/";
resp = upload_file_object(host, bucket,
    object_key, filename, ak, sk, NULL, headers, &error);
if (error != 0) {
    printf("curl err=%d\n", error);
} else {
    printf("status code=%d\n", resp->status_code);
    printf("status msg=%s\n", resp->status_msg);
    if (resp->body != NULL) {
        printf("error msg=%s\n", resp->body);
    }
}
buffer_free(resp);

4.7 下载文件

const char* to_save_file_name = "./local_save";
resp = download_file_object(host, bucket,
    object_key, to_save_file_name, ak, sk, NULL, &error);
if (error != 0) {
    printf("curl err=%d\n", error);
} else {
    printf("status code=%d\n", resp->status_code);
    printf("status msg=%s\n", resp->status_msg);
    if (resp->body != NULL) {
        printf("error msg=%s\n", resp->body);
    }
}
buffer_free(resp);

4.8 删除文件

const char* object_key = "YOUR_OBJECT_KEY";
resp = delete_object(host, bucket, object_key, ak, sk, NULL, &error);
if (error != 0) {
    printf("curl err=%d\n", error);
} else {
    printf("status code=%d\n", resp->status_code);
    printf("status msg=%s\n", resp->status_msg);
    if (resp->body != NULL) {
        printf("error msg=%s\n", resp->body);
    }
}
buffer_free(resp);

4.9 复制文件

const char* src_bucket = "SRC_BUCKET_NAME";
const char* src_object_key = "SRC_OBJECT_KEY";
const char* dst_bucket = "DST_BUCKET";
const char* dst_object_key = "DST_OBJECT_KEY";

resp = copy_object(host, src_bucket, src_object_key,
        dst_bucket, dst_object_key, ak, sk, NULL, NULL, &error);

if (error != 0) {
    printf("curl err=%d\n", error);
} else {
    printf("status code=%d\n", resp->status_code);
    printf("status msg=%s\n", resp->status_msg);
    if (resp->body != NULL) {
        printf("error msg=%s\n", resp->body);
    }
}
buffer_free(resp);

4.10 上传buf object

const char* buf = "hello world";
int buf_len = strlen(buf);

resp = upload_object(host, bucket,
    object_key, buf, buf_len, ak, sk, NULL, NULL, &error);
if (error != 0) {
    printf("curl err=%d\n", error);
} else {
    printf("status code=%d\n", resp->status_code);
    printf("status msg=%s\n", resp->status_msg);
    if (resp->body != NULL) {
        printf("error msg=%s\n", resp->body);
    }
}
free(buf);
buffer_free(resp);