使用 REST API 下载 Outlook 附件？答案

【问题标题】：Downloading Outlook attachments with REST API?使用 REST API 下载 Outlook 附件？
【发布时间】：2016-07-09 01:05:48
【问题描述】：

我正在从事与 Outlook Mail API 相关的项目。我想下载电子邮件的附件。文档说我可以“获取”附件，它们在 json 响应中返回不同的参数，但我很想知道我必须将哪个转换为什么，才能将实际附件保存到文件系统中。

http://msdn.microsoft.com/office/office365/api/mail-rest-operations#Getattachments

谢谢。

【问题讨论】：

标签： python api email outlook hotmail

【解决方案1】：

根据文档，https://outlook.office.com/api/v2.0/me/messages/{message_id}/attachments 返回包含单个附件标识符的附件集合：

{
    "@odata.context": "https://outlook.office.com/api/v2.0/$metadata#Me/Messages('AAMkAGI2THVSAAA%3D')/Attachments(Name)",
    "value": [
        {
            "@odata.type": "#Microsoft.OutlookServices.FileAttachment",
            "@odata.id": "https://outlook.office.com/api/v2.0/Users('ddfcd489-628b-40d7-b48b-57002df800e5@1717622f-1d94-4d0c-9d74-709fad664b77')/Messages('AAMkAGI2THVSAAA=')/Attachments('AAMkAGI2j4kShdM=')",
            "Id": "AAMkAGI2j4kShdM=",
            "Name": "minutes.docx"
        }
    ] }

现在，您可以遍历此列表并使用此 API - https://outlook.office.com/api/v2.0/me/messages/{message_id}/attachments/{attachment_id} 获取单个附件，其中 attachment_id 是从上述 API 返回的标识符。

响应将是：

{
    "@odata.context": "https://outlook.office.com/api/v2.0/$metadata#Me/Messages('AAMkAGI2THVSAAA%3D')/Attachments/$entity",
    "@odata.type": "#Microsoft.OutlookServices.FileAttachment",
    "@odata.id": "https://outlook.office.com/api/v2.0/Users('ddfcd489-628b-40d7-b48b-57002df800e5@1717622f-1d94-4d0c-9d74-709fad664b77')/Messages('AAMkAGI2THVSAAA=')/Attachments('AAMkAGI2j4kShdM=')",
    "Id": "AAMkAGI2j4kShdM=",
    "LastModifiedDateTime": "2014-10-20T00:41:52Z",
    "Name": "minutes.docx",
    "ContentType": "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
    "Size": 11585,
    "IsInline": false,
    "ContentId": null,
    "ContentLocation": null,
    "ContentBytes": "UEsDBBQABgAIAAAAIQDCAAA4KQAAAAA=" }

现在，您可以使用 ContentBytes 和 contentType 在本地保存此附件。此外，附件可以是ItemAttachments 或FileAttachments。在 Google 上搜索更多内容肯定会引导您找到一些示例代码，其中显示了如何下载它们。但这应该会给你一个想法。

你可以检查一下：

public static void GetAttachmentsFromEmail(ExchangeService service, ItemId itemId)
        {
            // Bind to an existing message item and retrieve the attachments collection.
            // This method results in an GetItem call to EWS.
            EmailMessage message = EmailMessage.Bind(service, itemId, new PropertySet(ItemSchema.Attachments));

            // Iterate through the attachments collection and load each attachment.
            foreach (Attachment attachment in message.Attachments)
            {
                if (attachment is FileAttachment)
                {
                    FileAttachment fileAttachment = attachment as FileAttachment;

                    // Load the attachment into a file.
                    // This call results in a GetAttachment call to EWS.
                    fileAttachment.Load("C:\\temp\\" + fileAttachment.Name);

                    Console.WriteLine("File attachment name: " + fileAttachment.Name);
                }
                else // Attachment is an item attachment.
                {
                    ItemAttachment itemAttachment = attachment as ItemAttachment;

                    // Load attachment into memory and write out the subject.
                    // This does not save the file like it does with a file attachment.
                    // This call results in a GetAttachment call to EWS.
                    itemAttachment.Load();

                    Console.WriteLine("Item attachment name: " + itemAttachment.Name);
                }
            }
        }

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