Image Processing (IMG) is a secure, cost-effective, and highly reliable image processing service that is provided by Object Storage Service (OSS) and can be used to process large numbers of images. After you upload source images to OSS, you can call RESTful API operations to process the images on a device that is connected over the Internet anytime, anywhere.
Usage notes
In this topic, the public endpoint of the China (Hangzhou) region is used. If you want to access OSS from other Alibaba Cloud services in the same region as OSS, use an internal endpoint. For more information about OSS regions and endpoints, see Regions and endpoints.
In this topic, an OSSClient instance is created by using an OSS endpoint. If you want to create an OSSClient instance by using custom domain names or Security Token Service (STS), see Initialization.
Use IMG parameters to process images
Use a single IMG parameter to process an image and save the image to your local computer
#include "oss_api.h"
#include "aos_http_io.h"
/* Specify the endpoint of the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the endpoint to https://oss-cn-hangzhou.aliyuncs.com. */
const char *endpoint = "yourEndpoint";
/* Specify the name of the bucket. Example: examplebucket. */
const char *bucket_name = "examplebucket";
/* Specify the full path of the object. Do not include the bucket name in the full path. Example: exampledir/exampleobject.txt. */
const char *object_name = "exampledir/exampleobject.txt";
/* Specify the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the region to cn-hangzhou. */
const char *region = "yourRegion";
void init_options(oss_request_options_t *options)
{
options->config = oss_config_create(options->pool);
/* Use a char* string to initialize data of the aos_string_t type. */
aos_str_set(&options->config->endpoint, endpoint);
/* Obtain access credentials from environment variables. Before you run the sample code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are configured. */
aos_str_set(&options->config->access_key_id, getenv("OSS_ACCESS_KEY_ID"));
aos_str_set(&options->config->access_key_secret, getenv("OSS_ACCESS_KEY_SECRET"));
// Specify two additional parameters.
aos_str_set(&options->config->region, region);
options->config->signature_version = 4;
/* Specify whether to use CNAME. The value 0 indicates that CNAME is not used. */
options->config->is_cname = 0;
/* Specify network parameters, such as the timeout period. */
options->ctl = aos_http_controller_create(options->pool, 0);
}
int main(int argc, char *argv[])
{
/* Call the aos_http_io_initialize method in main() to initialize global resources, such as network resources and memory resources. */
if (aos_http_io_initialize(NULL, 0) != AOSE_OK) {
exit(1);
}
/* Create a memory pool to manage memory. aos_pool_t is equivalent to apr_pool_t. The code used to create a memory pool is included in the APR library. */
aos_pool_t *pool;
/* Create a memory pool. The value of the second parameter is NULL. This value indicates that the pool does not inherit other memory pools. */
aos_pool_create(&pool, NULL);
/* Create and initialize options. This parameter includes global configuration information, such as endpoint, access_key_id, access_key_secret, is_cname, and curl. */
oss_request_options_t *oss_client_options;
/* Allocate the memory resources in the memory pool to the options. */
oss_client_options = oss_request_options_create(pool);
/* Initialize oss_client_options. */
init_options(oss_client_options);
/* Initialize the parameters. */
aos_string_t bucket;
aos_string_t object;
aos_string_t file;
aos_table_t *headers = NULL;
aos_table_t *params = NULL;
aos_table_t *resp_headers = NULL;
aos_status_t *resp_status = NULL;
aos_str_set(&bucket, bucket_name);
aos_str_set(&object, object_name);
/* Resize the image to 100 × 100 pixels. */
params = aos_table_make(pool, 1);
apr_table_set(params, OSS_PROCESS, "image/resize,m_fixed,w_100,h_100");
/* Save the processed image to your local computer. */
aos_str_set(&file, "yourLocalFileName");
resp_status = oss_get_object_to_file(oss_client_options, &bucket, &object, headers, params, &file, &resp_headers);
if (aos_status_is_ok(resp_status)) {
printf("get object to file succeeded\n");
} else {
printf("get object to file failed\n");
}
/* Release the memory pool. This operation releases the memory resources allocated for the request. */
aos_pool_destroy(pool);
/* Release the allocated global resources. */
aos_http_io_deinitialize();
return 0;
}Use multiple IMG parameters to process an image and save the image to your local computer
The following code provides an example on how to use multiple IMG parameters to process an image. Separate the parameters with forward slashes (/).
#include "oss_api.h"
#include "aos_http_io.h"
/* Specify the endpoint of the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the endpoint to https://oss-cn-hangzhou.aliyuncs.com. */
const char *endpoint = "yourEndpoint";
/* Specify the name of the bucket. Example: examplebucket. */
const char *bucket_name = "examplebucket";
/* Specify the full path of the object. Do not include the bucket name in the full path. Example: exampledir/exampleobject.txt. */
const char *object_name = "exampledir/exampleobject.txt";
/* Specify the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the region to cn-hangzhou. */
const char *region = "yourRegion";
void init_options(oss_request_options_t *options)
{
options->config = oss_config_create(options->pool);
/* Use a char* string to initialize data of the aos_string_t type. */
aos_str_set(&options->config->endpoint, endpoint);
/* Obtain access credentials from environment variables. Before you run the sample code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are configured. */
aos_str_set(&options->config->access_key_id, getenv("OSS_ACCESS_KEY_ID"));
aos_str_set(&options->config->access_key_secret, getenv("OSS_ACCESS_KEY_SECRET"));
// Specify two additional parameters.
aos_str_set(&options->config->region, region);
options->config->signature_version = 4;
/* Specify whether to use CNAME. The value 0 indicates that CNAME is not used. */
options->config->is_cname = 0;
/* Specify network parameters, such as the timeout period. */
options->ctl = aos_http_controller_create(options->pool, 0);
}
int main(int argc, char *argv[])
{
/* Call the aos_http_io_initialize method in main() to initialize global resources, such as network resources and memory resources. */
if (aos_http_io_initialize(NULL, 0) != AOSE_OK) {
exit(1);
}
/* Create a memory pool to manage memory. aos_pool_t is equivalent to apr_pool_t. The code used to create a memory pool is included in the APR library. */
aos_pool_t *pool;
/* Create a memory pool. The value of the second parameter is NULL. This value indicates that the pool does not inherit other memory pools. */
aos_pool_create(&pool, NULL);
/* Create and initialize options. This parameter includes global configuration information, such as endpoint, access_key_id, access_key_secret, is_cname, and curl. */
oss_request_options_t *oss_client_options;
/* Allocate the memory resources in the memory pool to the options. */
oss_client_options = oss_request_options_create(pool);
/* Initialize oss_client_options. */
init_options(oss_client_options);
/* Initialize the parameters. */
aos_string_t bucket;
aos_string_t object;
aos_string_t file;
aos_table_t *headers = NULL;
aos_table_t *params = NULL;
aos_table_t *resp_headers = NULL;
aos_status_t *resp_status = NULL;
aos_str_set(&bucket, bucket_name);
aos_str_set(&object, object_name);
/* Resize the image to 100 × 100 pixels and rotate the image 90 degrees. */
params = aos_table_make(pool, 1);
apr_table_set(params, OSS_PROCESS, "image/resize,m_fixed,w_100,h_100/rotate,90");
/* Save the processed image to your local computer. */
aos_str_set(&file, "yourLocalFileName");
resp_status = oss_get_object_to_file(oss_client_options, &bucket, &object, headers, params, &file, &resp_headers);
if (aos_status_is_ok(resp_status)) {
printf("get object to file succeeded\n");
} else {
printf("get object to file failed\n");
}
/* Release the memory pool. This operation releases the memory resources allocated for the request. */
aos_pool_destroy(pool);
/* Release the allocated global resources. */
aos_http_io_deinitialize();
return 0;
}Use an image style to process images
Create an image style.
You can add multiple IMG parameters to an image style to perform complex operations on images that are stored in a bucket. For more information, see Image styles.
Use the image style to process an image.
#include "oss_api.h" #include "aos_http_io.h" /* Specify the endpoint of the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the endpoint to https://oss-cn-hangzhou.aliyuncs.com. */ const char *endpoint = "yourEndpoint"; /* Specify the name of the bucket. Example: examplebucket. */ const char *bucket_name = "examplebucket"; /* Specify the full path of the object. Do not include the bucket name in the full path. Example: exampledir/exampleobject.txt. */ const char *object_name = "exampledir/exampleobject.txt"; /* Specify the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the region to cn-hangzhou. */ const char *region = "yourRegion"; void init_options(oss_request_options_t *options) { options->config = oss_config_create(options->pool); /* Use a char* string to initialize data of the aos_string_t type. */ aos_str_set(&options->config->endpoint, endpoint); /* Obtain access credentials from environment variables. Before you run the sample code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are configured. */ aos_str_set(&options->config->access_key_id, getenv("OSS_ACCESS_KEY_ID")); aos_str_set(&options->config->access_key_secret, getenv("OSS_ACCESS_KEY_SECRET")); // Specify two additional parameters. aos_str_set(&options->config->region, region); options->config->signature_version = 4; /* Specify whether to use CNAME. The value 0 indicates that CNAME is not used. */ options->config->is_cname = 0; /* Specify network parameters, such as the timeout period. */ options->ctl = aos_http_controller_create(options->pool, 0); } int main(int argc, char *argv[]) { /* Call the aos_http_io_initialize method in main() to initialize global resources, such as network resources and memory resources. */ if (aos_http_io_initialize(NULL, 0) != AOSE_OK) { exit(1); } /* Create a memory pool to manage memory. aos_pool_t is equivalent to apr_pool_t. The code used to create a memory pool is included in the APR library. */ aos_pool_t *pool; /* Create a memory pool. The value of the second parameter is NULL. This value indicates that the pool does not inherit other memory pools. */ aos_pool_create(&pool, NULL); /* Create and initialize options. This parameter includes global configuration information, such as endpoint, access_key_id, access_key_secret, is_cname, and curl. */ oss_request_options_t *oss_client_options; /* Allocate the memory resources in the memory pool to the options. */ oss_client_options = oss_request_options_create(pool); /* Initialize oss_client_options. */ init_options(oss_client_options); /* Initialize the parameters. */ aos_string_t bucket; aos_string_t object; aos_string_t file; aos_table_t *headers = NULL; aos_table_t *params = NULL; aos_table_t *resp_headers = NULL; aos_status_t *resp_status = NULL; aos_str_set(&bucket, bucket_name); aos_str_set(&object, object_name); /* Specify the image style. */ params = aos_table_make(pool, 1); /* Set yourCustomStyleName to the name of the image style that you created in Step 1. */ apr_table_set(params, OSS_PROCESS, "style/yourCustomStyleName"); /* Save the processed image to your local computer. */ aos_str_set(&file, "yourLocalFileName"); resp_status = oss_get_object_to_file(oss_client_options, &bucket, &object, headers, params, &file, &resp_headers); if (aos_status_is_ok(resp_status)) { printf("get object to file succeeded\n"); } else { printf("get object to file failed\n"); } /* Release the memory pool. This operation releases the memory resources allocated for the request. */ aos_pool_destroy(pool); /* Release the allocated global resources. */ aos_http_io_deinitialize(); return 0; }
Generate a signed object URL that includes IMG parameters
URLs of private objects must be signed. IMG parameters cannot be added to a signed URL. If you want to process a private object, add IMG parameters to the signature.
#include "oss_api.h"
#include "aos_http_io.h"
/* Specify the endpoint of the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the endpoint to https://oss-cn-hangzhou.aliyuncs.com. */
const char *endpoint = "yourEndpoint";
/* Specify the name of the bucket. Example: examplebucket. */
const char *bucket_name = "examplebucket";
/* Specify the full path of the object. Do not include the bucket name in the full path. Example: exampledir/exampleobject.txt. */
const char *object_name = "exampledir/exampleobject.txt";
/* Specify the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the region to cn-hangzhou. */
const char *region = "yourRegion";
void init_options(oss_request_options_t *options)
{
options->config = oss_config_create(options->pool);
/* Use a char* string to initialize data of the aos_string_t type. */
aos_str_set(&options->config->endpoint, endpoint);
/* Obtain access credentials from environment variables. Before you run the sample code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are configured. */
aos_str_set(&options->config->access_key_id, getenv("OSS_ACCESS_KEY_ID"));
aos_str_set(&options->config->access_key_secret, getenv("OSS_ACCESS_KEY_SECRET"));
// Specify two additional parameters.
aos_str_set(&options->config->region, region);
options->config->signature_version = 4;
/* Specify whether to use CNAME. The value 0 indicates that CNAME is not used. */
options->config->is_cname = 0;
/* Configure network parameters, such as the timeout period. */
options->ctl = aos_http_controller_create(options->pool, 0);
}
int main(int argc, char *argv[])
{
/* Call the aos_http_io_initialize method in main() to initialize global resources, such as network resources and memory resources. */
if (aos_http_io_initialize(NULL, 0) != AOSE_OK) {
exit(1);
}
/* Create a memory pool to manage memory. aos_pool_t is equivalent to apr_pool_t. The code used to create a memory pool is included in the APR library. */
aos_pool_t *pool;
/* Create a memory pool. The value of the second parameter is NULL. This value indicates that the pool does not inherit other memory pools. */
aos_pool_create(&pool, NULL);
/* Create and initialize options. This parameter includes global configuration information, such as endpoint, access_key_id, access_key_secret, is_cname, and curl. */
oss_request_options_t *oss_client_options;
/* Allocate the memory resources in the memory pool to the options. */
oss_client_options = oss_request_options_create(pool);
/* Initialize oss_client_options. */
init_options(oss_client_options);
/* Initialize the parameters. */
aos_string_t bucket;
aos_string_t object;
aos_table_t *params = NULL;
aos_http_request_t *req;
char *url_str;
apr_time_t now;
int64_t expire_time;
aos_str_set(&bucket, bucket_name);
aos_str_set(&object, object_name);
/* Resize the image to 100 × 100 pixels. */
params = aos_table_make(pool, 1);
apr_table_set(params, OSS_PROCESS, "image/resize,m_fixed,w_100,h_100");
req = aos_http_request_create(pool);
req->method = HTTP_GET;
req->query_params = params;
/* Specify the validity period (expire_time) in seconds. */
now = apr_time_now();
expire_time = now / 1000000 + 10 * 60;
/* Generate a signed URL. */
url_str = oss_gen_signed_url(oss_client_options, &bucket, &object, expire_time, req);
printf("url: %s\n", url_str);
/* Release the memory pool. This operation releases memory resources allocated for the request. */
aos_pool_destroy(pool);
/* Release the allocated global resources. */
aos_http_io_deinitialize();
return 0;
}