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获取未读邮件的数量

发布于 2024-10-01 13:30:11 字数 157 浏览 4 评论 0原文

我正在开发一个小软件来检查我的邮件帐户上是否有>0封未读电子邮件（任何免费邮件，imap）。

我正在用 C 编码，但我不是专家...

如何使用 C 的 imap4-api （或只是类似的东西）来检查是否有任何未读电子邮件（不获取它们）？

提前致谢

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流年里的时光 2024-10-08 13:30:11

有几种方法可以做到这一点。我将在协议级别进行解释，我敢打赌您的 C 库将至少公开其中之一...

一般来说，最有效的方法是发出 STATUS 命令并询问文件夹的 UNSEEN 计数：

A001 STATUS "INBOX" (UNSEEN)
* STATUS "INBOX" (UNSEEN 16)
A001 OK STATUS completed

您可以选择文件夹并检查 [UNSEEN] 响应代码是否返回未标记的 OK：

A002 SELECT INBOX
* 223 EXISTS
* 223 RECENT
* OK [UNSEEN 1] mailbox contains unseen messages
* OK [UIDVALIDITY 1] UIDs are valid for this mailbox
* OK [UIDNEXT 554] next expected UID is 554
* FLAGS (\Answered \Deleted \Draft \Flagged \Seen $Forwarded $MDNSent)
* OK [PERMANENTFLAGS (\Answered \Deleted \Draft \Flagged \Seen $Forwarded $MDNSent \*)] junk-related flags are not permanent
* OK [HIGHESTMODSEQ 504] modseq tracked on this mailbox
A002 OK [READ-WRITE] SELECT completed

选择文件夹后，您可以发出 SEARCH 命令并询问 UNSEEN 邮件（如果返回任何内容，则表示您有未读邮件）：

A003 SEARCH UNSEEN
* SEARCH 1 2 12 13 14 155 156 157 158 159 183 184 185 215 216 218
A003 OK SEARCH completed

请注意，所有这些都是针对每个文件夹进行操作的。如果您想了解邮箱中的所有文件夹，则必须遍历所有文件夹。要获取完整的文件夹列表，请使用 LIST 命令：

A004 LIST "" "*"
* LIST (\HasNoChildren) "/" "Drafts"
* LIST (\HasNoChildren) "/" "INBOX"
* LIST (\NoInferiors) "/" "Junk"
* LIST (\HasNoChildren) "/" "Sent"
* LIST (\HasNoChildren) "/" "Trash"
* LIST (\HasNoChildren) "/" "Unread Messages"
A004 OK LIST completed

There are several ways to do it. I'll explain at the protocol level, and I'd bet that your C library will expose at least one of these...

In general the most efficient way is to issue the STATUS command and ask for the folder's UNSEEN count:

A001 STATUS "INBOX" (UNSEEN)
* STATUS "INBOX" (UNSEEN 16)
A001 OK STATUS completed

You can SELECT the folder and check whether the [UNSEEN] response code comes back on an untagged OK:

A002 SELECT INBOX
* 223 EXISTS
* 223 RECENT
* OK [UNSEEN 1] mailbox contains unseen messages
* OK [UIDVALIDITY 1] UIDs are valid for this mailbox
* OK [UIDNEXT 554] next expected UID is 554
* FLAGS (\Answered \Deleted \Draft \Flagged \Seen $Forwarded $MDNSent)
* OK [PERMANENTFLAGS (\Answered \Deleted \Draft \Flagged \Seen $Forwarded $MDNSent \*)] junk-related flags are not permanent
* OK [HIGHESTMODSEQ 504] modseq tracked on this mailbox
A002 OK [READ-WRITE] SELECT completed

Once the folder has been selected, you can issue a SEARCH command and ask for UNSEEN messages (if anything comes back, you've got unread mail):

A003 SEARCH UNSEEN
* SEARCH 1 2 12 13 14 155 156 157 158 159 183 184 185 215 216 218
A003 OK SEARCH completed

Note that all of these operate on a per-folder basis. If you want to know about all the folders in your mailbox, you'll have to iterate over them all. To get the full folder list, use the LIST command:

A004 LIST "" "*"
* LIST (\HasNoChildren) "/" "Drafts"
* LIST (\HasNoChildren) "/" "INBOX"
* LIST (\NoInferiors) "/" "Junk"
* LIST (\HasNoChildren) "/" "Sent"
* LIST (\HasNoChildren) "/" "Trash"
* LIST (\HasNoChildren) "/" "Unread Messages"
A004 OK LIST completed

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