文件 AWS 開發套件範例 GitHub 儲存庫中有更多可用的 [AWS SDK 範例](https://github.com/awsdocs/aws-doc-sdk-examples)。
本文為英文版的機器翻譯版本，如內容有任何歧義或不一致之處，概以英文版為準。
# `ListThings` 搭配 AWS SDK 或 CLI 使用
下列程式碼範例示範如何使用 `ListThings`。
動作範例是大型程式的程式碼摘錄，必須在內容中執行。您可以在下列程式碼範例的內容中看到此動作：
+ [了解基本概念](iot_example_iot_Scenario_section.md)
------
#### [ .NET ]
**適用於 .NET 的 SDK (v4)**
GitHub 上提供更多範例。尋找完整範例，並了解如何在 [AWS 程式碼範例儲存庫](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/dotnetv4/IoT#code-examples)中設定和執行。
```
///
/// Lists IoT Things with pagination support.
///
/// List of Things, or empty list if listing failed.
public async Task> ListThingsAsync()
{
try
{
// Use pages of 10.
var request = new ListThingsRequest()
{
MaxResults = 10
};
var response = await _amazonIoT.ListThingsAsync(request);
// Since there is not a built-in paginator, use the NextMarker to paginate.
bool hasMoreResults = true;
var things = new List();
while (hasMoreResults)
{
things.AddRange(response.Things);
// If NextMarker is not null, there are more results. Get the next page of results.
if (!String.IsNullOrEmpty(response.NextMarker))
{
request.Marker = response.NextMarker;
response = await _amazonIoT.ListThingsAsync(request);
}
else
hasMoreResults = false;
}
_logger.LogInformation($"Retrieved {things.Count} Things");
return things;
}
catch (Amazon.IoT.Model.ThrottlingException ex)
{
_logger.LogWarning($"Request throttled, please try again later: {ex.Message}");
return new List();
}
catch (Exception ex)
{
_logger.LogError($"Couldn't list Things. Here's why: {ex.Message}");
return new List();
}
}
```
+ 如需 API 詳細資訊，請參閱*適用於 .NET 的 AWS SDK 《 API 參考*》中的 [ListThings](https://docs.aws.amazon.com/goto/DotNetSDKV4/iot-2015-05-28/ListThings)。
------
#### [ CLI ]
**AWS CLI**
**範例 1：列出登錄檔中的所有物件**
下列`list-things`範例列出在您 AWS 帳戶的 AWS IoT 登錄檔中定義的物件 （裝置）。
```
aws iot list-things
```
輸出：
```
{
"things": [
{
"thingName": "ThirdBulb",
"thingTypeName": "LightBulb",
"thingArn": "arn:aws:iot:us-west-2:123456789012:thing/ThirdBulb",
"attributes": {
"model": "123",
"wattage": "75"
},
"version": 2
},
{
"thingName": "MyOtherLightBulb",
"thingTypeName": "LightBulb",
"thingArn": "arn:aws:iot:us-west-2:123456789012:thing/MyOtherLightBulb",
"attributes": {
"model": "123",
"wattage": "75"
},
"version": 3
},
{
"thingName": "MyLightBulb",
"thingTypeName": "LightBulb",
"thingArn": "arn:aws:iot:us-west-2:123456789012:thing/MyLightBulb",
"attributes": {
"model": "123",
"wattage": "75"
},
"version": 1
},
{
"thingName": "SampleIoTThing",
"thingArn": "arn:aws:iot:us-west-2:123456789012:thing/SampleIoTThing",
"attributes": {},
"version": 1
}
]
}
```
**範例 2：列出具有特定屬性的定義物件**
下列 `list-things` 範例顯示具有名為 `wattage` 之屬性的物件清單。
```
aws iot list-things \
--attribute-name wattage
```
輸出：
```
{
"things": [
{
"thingName": "MyLightBulb",
"thingTypeName": "LightBulb",
"thingArn": "arn:aws:iot:us-west-2:123456789012:thing/MyLightBulb",
"attributes": {
"model": "123",
"wattage": "75"
},
"version": 1
},
{
"thingName": "MyOtherLightBulb",
"thingTypeName": "LightBulb",
"thingArn": "arn:aws:iot:us-west-2:123456789012:thing/MyOtherLightBulb",
"attributes": {
"model": "123",
"wattage": "75"
},
"version": 3
}
]
}
```
如需詳細資訊，請參閱《*AWS IoT 開發人員指南*》中的[如何使用登錄檔管理物件](https://docs.aws.amazon.com/iot/latest/developerguide/thing-registry.html)。
+ 如需 API 詳細資訊，請參閱《AWS CLI 命令參考》**中的 [ListThings](https://awscli.amazonaws.com/v2/documentation/api/latest/reference/iot/list-things.html)。
------
#### [ Python ]
**適用於 Python 的 SDK (Boto3)**
GitHub 上提供更多範例。尋找完整範例，並了解如何在 [AWS 程式碼範例儲存庫](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/python/example_code/iot#code-examples)中設定和執行。
```
class IoTWrapper:
"""Encapsulates AWS IoT actions."""
def __init__(self, iot_client, iot_data_client=None):
"""
:param iot_client: A Boto3 AWS IoT client.
:param iot_data_client: A Boto3 AWS IoT Data Plane client.
"""
self.iot_client = iot_client
self.iot_data_client = iot_data_client
@classmethod
def from_client(cls):
iot_client = boto3.client("iot")
iot_data_client = boto3.client("iot-data")
return cls(iot_client, iot_data_client)
def list_things(self):
"""
Lists AWS IoT things.
:return: The list of things.
"""
try:
things = []
paginator = self.iot_client.get_paginator("list_things")
for page in paginator.paginate():
things.extend(page["things"])
logger.info("Retrieved %s things.", len(things))
return things
except ClientError as err:
if err.response["Error"]["Code"] == "ThrottlingException":
logger.error("Request throttled. Please try again later.")
else:
logger.error(
"Couldn't list things. Here's why: %s: %s",
err.response["Error"]["Code"],
err.response["Error"]["Message"],
)
raise
```
+ 如需 API 詳細資訊，請參閱《適用於 *AWS Python (Boto3) 的 SDK API 參考*》中的 [ListThings](https://docs.aws.amazon.com/goto/boto3/iot-2015-05-28/ListThings)。
------
#### [ Rust ]
**適用於 Rust 的 SDK**
GitHub 上提供更多範例。尋找完整範例，並了解如何在 [AWS 程式碼範例儲存庫](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/rustv1/examples/iot#code-examples)中設定和執行。
```
async fn show_things(client: &Client) -> Result<(), Error> {
let resp = client.list_things().send().await?;
println!("Things:");
for thing in resp.things.unwrap() {
println!(
" Name: {}",
thing.thing_name.as_deref().unwrap_or_default()
);
println!(
" Type: {}",
thing.thing_type_name.as_deref().unwrap_or_default()
);
println!(
" ARN: {}",
thing.thing_arn.as_deref().unwrap_or_default()
);
println!();
}
println!();
Ok(())
}
```
+ 如需 API 詳細資訊，請參閱《AWS SDK for Rust API 參考》**中的 [ListThings](https://docs.rs/aws-sdk-iot/latest/aws_sdk_iot/client/struct.Client.html#method.list_things)。
------