上传回调
本文介绍如何使用上传回调。
上传回调的完整代码请参见GitHub。
以下代码用于上传回调(callback):
#include "oss_api.h"
#include "aos_http_io.h"
const char *endpoint = "<yourEndpoint>";
const char *access_key_id = "<yourAccessKeyId>";
const char *access_key_secret = "<yourAccessKeySecret>";
const char *bucket_name = "<yourBucketName>";
const char *object_name = "<yourObjectName>";
const char *object_content = "More than just cloud.";
void init_options(oss_request_options_t *options)
{
options->config = oss_config_create(options->pool);
/* 用char*类型的字符串初始化aos_string_t类型。*/
aos_str_set(&options->config->endpoint, endpoint);
aos_str_set(&options->config->access_key_id, access_key_id);
aos_str_set(&options->config->access_key_secret, access_key_secret);
/* 是否使用了CNAME。0表示不使用。*/
options->config->is_cname = 0;
/* 设置网络相关参数,比如超时时间等。*/
options->ctl = aos_http_controller_create(options->pool, 0);
}
int main(int argc, char *argv[])
{
aos_pool_t *p = NULL;
aos_status_t *s = NULL;
aos_string_t bucket;
aos_string_t object;
aos_table_t *headers = NULL;
oss_request_options_t *options = NULL;
aos_table_t *resp_headers = NULL;
aos_list_t resp_body;
aos_list_t buffer;
aos_buf_t *content;
char *buf = NULL;
int64_t len = 0;
int64_t size = 0;
int64_t pos = 0;
char b64_buf[1024];
int b64_len;
/* 采用JSON格式。*/
char *callback = "{"
"\"callbackUrl\":\"http://oss-demo.aliyuncs.com:23450\","
"\"callbackHost\":\"oss-cn-hangzhou.aliyuncs.com\","
"\"callbackBody\":\"bucket=${bucket}&object=${object}&size=${size}&mimeType=${mimeType}\","
"\"callbackBodyType\":\"application/x-www-form-urlencoded\""
"}";
/* 在程序入口调用aos_http_io_initialize方法来初始化网络、内存等全局资源。*/
if (aos_http_io_initialize(NULL, 0) != AOSE_OK) {
exit(1);
}
/* 初始化参数。*/
aos_pool_create(&p, NULL);
options = oss_request_options_create(p);
init_options(options);
aos_str_set(&bucket, bucket_name);
aos_str_set(&object, object_name);
aos_list_init(&resp_body);
aos_list_init(&buffer);
content = aos_buf_pack(options->pool, object_content, strlen(object_content));
aos_list_add_tail(&content->node, &buffer);
/* 将callback放入header。*/
b64_len = aos_base64_encode((unsigned char*)callback, strlen(callback), b64_buf);
b64_buf[b64_len] = '\0';
headers = aos_table_make(p, 1);
apr_table_set(headers, OSS_CALLBACK, b64_buf);
/* 上传回调。*/
s = oss_do_put_object_from_buffer(options, &bucket, &object, &buffer,
headers, NULL, NULL, &resp_headers, &resp_body);
if (aos_status_is_ok(s)) {
printf("put object from buffer succeeded\n");
} else {
printf("put object from buffer failed\n");
}
/* 获取buffer长度。*/
len = aos_buf_list_len(&resp_body);
buf = (char *)aos_pcalloc(p, (apr_size_t)(len + 1));
buf[len] = '\0';
/* 拷贝buffer内容到内存。*/
aos_list_for_each_entry(aos_buf_t, content, &resp_body, node) {
size = aos_buf_size(content);
memcpy(buf + pos, content->pos, (size_t)size);
pos += size;
}
/* 释放内存池,相当于释放了请求过程中各资源分配的内存。*/
aos_pool_destroy(p);
/* 释放之前分配的全局资源。*/
aos_http_io_deinitialize();
return 0;
}
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