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## Mailcore 2: Introduction ##
MailCore 2 provides a simple and asynchronous Objective-C API to work with the e-mail protocols **IMAP**, **POP** and **SMTP**. The API has been redesigned from the ground up. It features:
- **POP**, **IMAP** and **SMTP** support
- **[RFC822](http://www.ietf.org/rfc/rfc0822.txt)** parser and generator
- **Asynchronous** APIs
- **HTML** rendering of messages
- **iOS** and **Mac** support
[](https://travis-ci.org/MailCore/mailcore2)
## Installation ##
1. If you're migrating from MailCore1, you should first clean your build folder.
2. Checkout MailCore2 into a directory relative to your project.
3. Under the `build-mac` directory, locate the `mailcore2.xcodeproj` file, and drag this into your Xcode project.
4. **For Mac** - If you're building for Mac, you can either link against MailCore 2 as a framework, or as a static library:
* Mac framework
- Go to Build Phases from your build target, and under 'Link Binary With Libraries', add `MailCore.framework` and `Security.framework`.
- Make sure to use LLVM C++ standard library. Open Build Settings, scroll down to 'C++ Standard Library', and select `libc++`.
- In Build Phases, add a Target Dependency of `mailcore osx` (it's the one with a little toolbox icon).
- Goto `Editor > Add Build Phase > Copy Files`.
- Expand the newly created Build Phase and change it's destination to "Frameworks".
- Click the `+` icon and select `MailCore.framework`.
* Mac static library
- Go to Build Phases from your build target, and under 'Link Binary With Libraries', add `libMailCore.a` and `Security.framework`.
- Set 'Other Linker Flags' under Build Settings: `-lctemplate -letpan -licudata -licui18n -licuuc -lxml2 -lsasl2 -liconv -ltidy -lz` `-licucore -lc++ -stdlib=libc++ -ObjC -lcrypto -lssl`
- Make sure to use LLVM C++ standard library. In Build Settings, locate 'C++ Standard Library', and select `libc++`.
- In Build Phases, add a Target Dependency of `static mailcore2 osx`.
5. **For iOS** - If you're targeting iOS, you have to link against MailCore 2 as a static library:
* Add `libMailCore-ios.a`
* Add `CFNetwork.framework`
* Add `Security.framework`
* Set 'Other Linker Flags': `-lctemplate-ios -letpan-ios -licudata -licui18n -licuuc -lxml2 -lsasl2 -liconv -ltidy -lz` `-licucore -lc++ -stdlib=libc++ -ObjC`
* Make sure to use LLVM C++ standard library. Open Build Settings, scroll down to 'C++ Standard Library', and select `libc++`.
* In Build Phases, add a Target Dependency of `static mailcore2 ios`.
6. Profit.
Here's a video that shows all the steps for iOS:
http://www.youtube.com/watch?v=9fAo6oBzlQI
## Basic IMAP Usage ##
Using MailCore 2 is just a little more complex conceptually than the original MailCore. All fetch requests in MailCore 2 are made asynchronously through a queue. What does this mean? Well, let's take a look at a simple example:
```objc
MCOIMAPSession *session = [[MCOIMAPSession alloc] init];
[session setHostname:@"imap.gmail.com"];
[session setPort:993];
[session setUsername:@"ADDRESS@gmail.com"];
[session setPassword:@"123456"];
[session setConnectionType:MCOConnectionTypeTLS];
MCOIMAPMessagesRequestKind requestKind = MCOIMAPMessagesRequestKindHeaders;
NSString *folder = @"INBOX";
MCOIndexSet *uids = [MCOIndexSet indexSetWithRange:MCORangeMake(1, UINT64_MAX)];
MCOIMAPFetchMessagesOperation *fetchOperation = [session fetchMessagesByUIDOperationWithFolder:folder requestKind:requestKind uids:uids];
[fetchOperation start:^(NSError * error, NSArray * fetchedMessages, MCOIndexSet * vanishedMessages) {
//We've finished downloading the messages!
//Let's check if there was an error:
if(error) {
NSLog(@"Error downloading message headers:%@", error);
}
//And, let's print out the messages...
NSLog(@"The post man delivereth:%@", fetchedMessages);
}];
```
In this sample, we retrieved and printed a list of email headers from an IMAP server. In order to execute the fetch, we request an asynchronous operation object from the `MCOIMAPSession` instance with our parameters (more on this later). This operation object is able to initiate a connection to Gmail when we call the `start` method. Now here's where things get a little tricky. We call the `start` function with an Objective-C block, which is executed on the main thread when the fetch operation completes. The actual fetching from IMAP is done on a **background thread**, leaving your UI and other processing **free to use the main thread**.
## Documentation ##
* [Class documentation](http://libmailcore.com/mailcore2/api/index.html)
* [Wiki](https://github.com/MailCore/mailcore2/wiki)
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