API | Operation | Description |
Querying object metadata | Queries the metadata of an object |
HEAD Object
API to perform the action.cos_status_t *cos_check_object_exist(const cos_request_options_t *options,const cos_string_t *bucket,const cos_string_t *object,cos_table_t *headers,cos_object_exist_status_e *object_exist,cos_table_t **resp_headers);
Parameter | Description | Type |
options | COS request options | Struct |
bucket | Bucket name in the format of BucketName-APPID | String |
object | Object name | String |
headers | Additional headers of a COS request | Struct |
object_exist | Whether an object exists. Enumerated values: exist , non exist , unknown (no explicit state is obtained) | Enum |
resp_headers | Returns the HTTP response headers | Struct |
Response Parameter | Description | Type |
code | Error code | Int |
error_code | Error code content | String |
error_msg | Error code description | String |
req_id | Request message ID | String |
#include "cos_http_io.h"#include "cos_api.h"#include "cos_log.h"// `endpoint` is the COS access domain name. For more information, see https://www.tencentcloud.com/document/product/436/6224.static char TEST_COS_ENDPOINT[] = "cos.ap-guangzhou.myqcloud.com";// A developer-owned secret ID/key used for the project. It can be obtained at https://console.tencentcloud.com/cam/capi.static char *TEST_ACCESS_KEY_ID; // Your SecretIdstatic char *TEST_ACCESS_KEY_SECRET; // Your SecretKey// A unique user-level resource identifier for COS access. It can be obtained at https://console.tencentcloud.com/cam/capi.static char TEST_APPID[] = "<APPID>"; // Your APPID// COS bucket name, in the format of [bucket]-[appid], for example `mybucket-1253666666`. It can be obtained at https://console.tencentcloud.com/cos5/bucket.static char TEST_BUCKET_NAME[] = "<bucketname-appid>";// A unique identifier of an object stored in COS. For more information about objects and object keys, please see https://www.tencentcloud.com/document/product/436/13324.static char TEST_OBJECT_NAME1[] = "1.txt";void log_status(cos_status_t *s){cos_warn_log("status->code: %d", s->code);if (s->error_code) cos_warn_log("status->error_code: %s", s->error_code);if (s->error_msg) cos_warn_log("status->error_msg: %s", s->error_msg);if (s->req_id) cos_warn_log("status->req_id: %s", s->req_id);}void init_test_config(cos_config_t *config, int is_cname){cos_str_set(&config->endpoint, TEST_COS_ENDPOINT);cos_str_set(&config->access_key_id, TEST_ACCESS_KEY_ID);cos_str_set(&config->access_key_secret, TEST_ACCESS_KEY_SECRET);cos_str_set(&config->appid, TEST_APPID);config->is_cname = is_cname;}void init_test_request_options(cos_request_options_t *options, int is_cname){options->config = cos_config_create(options->pool);init_test_config(options->config, is_cname);options->ctl = cos_http_controller_create(options->pool, 0);}void test_check_object_exist(){cos_pool_t *p = NULL;int is_cname = 0;cos_status_t *s = NULL;cos_request_options_t *options = NULL;cos_string_t bucket;cos_string_t object;cos_table_t *resp_headers;cos_table_t *headers = NULL;cos_object_exist_status_e object_exist;cos_pool_create(&p, NULL);options = cos_request_options_create(p);init_test_request_options(options, is_cname);cos_str_set(&bucket, TEST_BUCKET_NAME);cos_str_set(&object, TEST_OBJECT_NAME1);// Check whether an object existss = cos_check_object_exist(options, &bucket, &object, headers, &object_exist, &resp_headers);if (object_exist == COS_OBJECT_NON_EXIST) {printf("object: %.*s non exist.\\n", object.len, object.data);} else if (object_exist == COS_OBJECT_EXIST) {printf("object: %.*s exist.\\n", object.len, object.data);} else {printf("object: %.*s unknown status.\\n", object.len, object.data);log_status(s);}cos_pool_destroy(p);}int main(int argc, char *argv[]){// Get SecretId and SecretKey from environment variablesTEST_ACCESS_KEY_ID = getenv("COS_SECRETID");TEST_ACCESS_KEY_SECRET = getenv("COS_SECRETKEY");if (cos_http_io_initialize(NULL, 0) != COSE_OK) {exit(1);}// Set the log level. Default value: `COS_LOG_WARN`cos_log_set_level(COS_LOG_WARN);// Set log output. Default value: `stderr`cos_log_set_output(NULL);test_check_object_exist();cos_http_io_deinitialize();return 0;}
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