Sono disponibili altri esempi per SDK AWS nel repository GitHub della documentazione degli esempi per SDK AWS.
Esempi di codice per AWS IoT utilizzando gli SDK AWS
Gli esempi di codice seguenti mostrano come utilizzare i AWS IoT con un Software Development Kit (SDK) AWS.
Nozioni di base: esempi di codice che mostrano come eseguire le operazioni essenziali all’interno di un servizio.
Le azioni sono estratti di codice da programmi più grandi e devono essere eseguite nel contesto. Sebbene le operazioni mostrino come richiamare le singole funzioni del servizio, è possibile visualizzarle contestualizzate negli scenari correlati.
Nozioni di base
L’esempio di codice seguente mostra come iniziare a utilizzare AWS IoT.
- C++
-
- SDK per C++
-
Codice per il file CMake CMakeLists.txt.
# Set the minimum required version of CMake for this project.
cmake_minimum_required(VERSION 3.13)
# Set the AWS service components used by this project.
set(SERVICE_COMPONENTS iot)
# Set this project's name.
project("hello_iot")
# Set the C++ standard to use to build this target.
# At least C++ 11 is required for the AWS SDK for C++.
set(CMAKE_CXX_STANDARD 11)
# Use the MSVC variable to determine if this is a Windows build.
set(WINDOWS_BUILD ${MSVC})
if (WINDOWS_BUILD) # Set the location where CMake can find the installed libraries for the AWS SDK.
string(REPLACE ";" "/aws-cpp-sdk-all;" SYSTEM_MODULE_PATH "${CMAKE_SYSTEM_PREFIX_PATH}/aws-cpp-sdk-all")
list(APPEND CMAKE_PREFIX_PATH ${SYSTEM_MODULE_PATH})
endif ()
# Find the AWS SDK for C++ package.
find_package(AWSSDK REQUIRED COMPONENTS ${SERVICE_COMPONENTS})
if (WINDOWS_BUILD AND AWSSDK_INSTALL_AS_SHARED_LIBS)
# Copy relevant AWS SDK for C++ libraries into the current binary directory for running and debugging.
# set(BIN_SUB_DIR "/Debug") # If you are building from the command line, you may need to uncomment this
# and set the proper subdirectory to the executables' location.
AWSSDK_CPY_DYN_LIBS(SERVICE_COMPONENTS "" ${CMAKE_CURRENT_BINARY_DIR}${BIN_SUB_DIR})
endif ()
add_executable(${PROJECT_NAME}
hello_iot.cpp)
target_link_libraries(${PROJECT_NAME}
${AWSSDK_LINK_LIBRARIES})
Codice per il file origine hello_iot.cpp.
#include <aws/core/Aws.h>
#include <aws/iot/IoTClient.h>
#include <aws/iot/model/ListThingsRequest.h>
#include <iostream>
/*
* A "Hello IoT" starter application which initializes an AWS IoT client and
* lists the AWS IoT topics in the current account.
*
* main function
*
* Usage: 'hello_iot'
*
*/
int main(int argc, char **argv) {
Aws::SDKOptions options;
// Optional: change the log level for debugging.
// options.loggingOptions.logLevel = Aws::Utils::Logging::LogLevel::Debug;
Aws::InitAPI(options); // Should only be called once.
{
Aws::Client::ClientConfiguration clientConfig;
// Optional: Set to the AWS Region (overrides config file).
// clientConfig.region = "us-east-1";
Aws::IoT::IoTClient iotClient(clientConfig);
// List the things in the current account.
Aws::IoT::Model::ListThingsRequest listThingsRequest;
Aws::String nextToken; // Used for pagination.
Aws::Vector<Aws::IoT::Model::ThingAttribute> allThings;
do {
if (!nextToken.empty()) {
listThingsRequest.SetNextToken(nextToken);
}
Aws::IoT::Model::ListThingsOutcome listThingsOutcome = iotClient.ListThings(
listThingsRequest);
if (listThingsOutcome.IsSuccess()) {
const Aws::Vector<Aws::IoT::Model::ThingAttribute> &things = listThingsOutcome.GetResult().GetThings();
allThings.insert(allThings.end(), things.begin(), things.end());
nextToken = listThingsOutcome.GetResult().GetNextToken();
}
else {
std::cerr << "List things failed"
<< listThingsOutcome.GetError().GetMessage() << std::endl;
break;
}
} while (!nextToken.empty());
std::cout << allThings.size() << " thing(s) found." << std::endl;
for (auto const &thing: allThings) {
std::cout << thing.GetThingName() << std::endl;
}
}
Aws::ShutdownAPI(options); // Should only be called once.
return 0;
}
- Java
-
- SDK per Java 2.x
-
import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.services.iot.IotClient;
import software.amazon.awssdk.services.iot.model.ListThingsRequest;
import software.amazon.awssdk.services.iot.model.ListThingsResponse;
import software.amazon.awssdk.services.iot.model.ThingAttribute;
import software.amazon.awssdk.services.iot.paginators.ListThingsIterable;
import java.util.List;
public class HelloIoT {
public static void main(String[] args) {
System.out.println("Hello AWS IoT. Here is a listing of your AWS IoT Things:");
IotClient iotClient = IotClient.builder()
.region(Region.US_EAST_1)
.build();
listAllThings(iotClient);
}
public static void listAllThings(IotClient iotClient) {
iotClient.listThingsPaginator(ListThingsRequest.builder()
.maxResults(10)
.build())
.stream()
.flatMap(response -> response.things().stream())
.forEach(attribute -> {
System.out.println("Thing name: " + attribute.thingName());
System.out.println("Thing ARN: " + attribute.thingArn());
});
}
}
- Kotlin
-
- SDK per Kotlin
-
import aws.sdk.kotlin.services.iot.IotClient
import aws.sdk.kotlin.services.iot.model.ListThingsRequest
suspend fun main() {
println("A listing of your AWS IoT Things:")
listAllThings()
}
suspend fun listAllThings() {
val thingsRequest =
ListThingsRequest {
maxResults = 10
}
IotClient.fromEnvironment { region = "us-east-1" }.use { iotClient ->
val response = iotClient.listThings(thingsRequest)
val thingList = response.things
if (thingList != null) {
for (attribute in thingList) {
println("Thing name ${attribute.thingName}")
println("Thing ARN: ${attribute.thingArn}")
}
}
}
}
