Force.com Apex Code Developer's Guide

Getting Started
Writing Apex
Ways to Invoke Apex
Invoking Apex
Apex Transactions and Governor Limits
Using Salesforce Features with Apex
Actions
Approval Processing
Chatter Answers and Ideas
Chatter in Apex
Chatter in Apex Examples
Get Feed Elements From a Feed
Post a Feed Element
Post a Feed Element with a Mention
Post a Feed Element with Existing Content
Post a Feed Element with a New File (Binary) Attachment
Post a Batch of Feed Elements
Post a Batch of Feed Elements with New (Binary) Files
Define an Action Link and Post with a Feed Element
Define an Action Link in a Template and Post with a Feed Element
Edit a Feed Element
Edit a Question Title and Post
Like a Feed Element
Bookmark a Feed Element
Share a Feed Element
Share a Feed Element and Add a Comment
Post a Comment
Post a Comment with a Mention
Post a Comment with an Existing File
Post a Comment with a New File
Edit a Comment
Follow a Record
Unfollow a Record
Chatter in Apex Features
Using ConnectApi Input and Output Classes
Understanding Limits for ConnectApi Classes
Serializing and Deserializing ConnectApi Obejcts
ConnectApi Versioning and Equality Checking
Casting ConnectApi Objects
Wildcards
Testing ConnectApi Code
Differences Between ConnectApi Classes and Other Apex Classes
Moderate Chatter Private Messages with Triggers
Communities
Email
Salesforce Knowledge
Lightning Connect
Salesforce1 Reporting API via Apex
Force.com Sites
Support Classes
Territory Management 2.0
Visual Workflow
Integration and Apex Utilities
Finishing Touches
Reference
Appendices
Glossary
PDF

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Post a Comment with an Existing File

To post a comment and attach an existing file (already uploaded to Salesforce) to the comment, create a ConnectApi.CommentInput object to pass to the postCommentToFeedElement(communityId, feedElementId, comment, feedElementFileUpload)method.
1swfobject.registerObject("clippy.codeblock-0", "9");
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17String feedElementId = '0D5D0000000KtW3';
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19ConnectApi.CommentInput commentInput = new ConnectApi.CommentInput();
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21ConnectApi.MessageBodyInput messageBodyInput = new ConnectApi.MessageBodyInput();
22ConnectApi.TextSegmentInput textSegmentInput = new ConnectApi.TextSegmentInput();
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24textSegmentInput.text = 'I attached this file from Salesforce Files.';
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26messageBodyInput.messageSegments = new List<ConnectApi.MessageSegmentInput>();
27messageBodyInput.messageSegments.add(textSegmentInput);
28commentInput.body = messageBodyInput;
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30ConnectApi.CommentCapabilitiesInput commentCapabilitiesInput = new ConnectApi.CommentCapabilitiesInput();
31ConnectApi.ContentCapabilityInput contentCapabilityInput = new ConnectApi.ContentCapabilityInput();
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33commentCapabilitiesInput.content = contentCapabilityInput;
34contentCapabilityInput.contentDocumentId = '069D00000001rNJ';
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36commentInput.capabilities = commentCapabilitiesInput;
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38ConnectApi.Comment commentRep = ConnectApi.ChatterFeeds.postCommentToFeedElement(Network.getNetworkId(), feedElementId, commentInput, null);
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