# Manage Presentation Comments in C++

> Master presentation comments with Aspose.Slides for C++: add, read, edit, and delete comments in PowerPoint files fast and easily.

Source: https://docs.aspose.com/slides/cpp/presentation-comments/
Updated: 2026-08-02


## **Overview**

This article explains how to manage presentation comments in Aspose.Slides. It shows the main comment-related types and demonstrates how to add comments to slides, access existing comments, work with replies, use modern comments, and remove comments from a presentation.

The examples focus on common review and collaboration scenarios in PowerPoint, such as assigning comments to authors, reading comment content and metadata, building reply chains, and clearing all comments or deleting selected ones.

In PowerPoint, a comment appears as a note or annotation on a slide. When a comment is clicked, its contents or messages are revealed.

### **Why Add Comments to Presentations?**

You may want to use comments to provide feedback or communicate with your colleagues when you review presentations.

To allow you to use comments in PowerPoint presentations, Aspose.Slides for C++ provides

* The [Presentation](https://reference.aspose.com/slides/cpp/class/aspose.slides.presentation) class, which contains the collections of authors (from the [get_CommentAuthors()](https://reference.aspose.com/slides/cpp/class/aspose.slides.presentation#ac100feeb13ea426b85557a829676227d) method). The authors add comments to slides. 
* The  [ICommentCollection](https://reference.aspose.com/slides/cpp/class/aspose.slides.i_comment_collection) interface, which contains the collection of comments for individual authors. 
* The  [IComment](https://reference.aspose.com/slides/cpp/class/aspose.slides.i_comment) class, which contains information on authors and their comments: who added the comment, the time the comment was added, the comment's position, etc. 
* The [CommentAuthor](https://reference.aspose.com/slides/cpp/class/aspose.slides.comment_author) class, which contains information on individual authors: the author's name, his initials, comments associated with the author's name, etc. 

## **Add a Slide Comment**
This C++ code shows you how to add a comment to a slide in a PowerPoint presentation:

```cpp
// Instantiates the Presentation class
auto presentation = System::MakeObject<Presentation>();
// Adds an empty slide
presentation->get_Slides()->AddEmptySlide(presentation->get_LayoutSlides()->idx_get(0));

// Adds an author
auto author = presentation->get_CommentAuthors()->AddAuthor(u"Jawad", u"MF");

// Sets the position for comments
PointF point;
point.set_X(0.2f);
point.set_Y(0.2f);

// Accesses ISlide 1
auto slide1 = presentation->get_Slides()->idx_get(0);
// Accesses ISlide 2
auto slide2 = presentation->get_Slides()->idx_get(1);

// Adds slide comment for an author on slide 1
author->get_Comments()->AddComment(u"Hello Jawad, this is slide comment", slide1, point, DateTime::get_Now());

// Adds slide comment for an author on slide 2
author->get_Comments()->AddComment(u"Hello Jawad, this is second slide comment", slide2, point, DateTime::get_Now());

// When null is passed as an argument, comments from all authors are brought to the selected slide
auto comments = slide1->GetSlideComments(author);

// Accesses the comment at index 0 for slide 1
String str = comments[0]->get_Text();

presentation->Save(u"Comments_out.pptx", SaveFormat::Pptx);

if (comments->GetLength(0) > 0)
{
    // Selects the Author's comments collection at index 0
    auto commentCollection = comments[0]->get_Author()->get_Comments();
    String Comment = commentCollection->idx_get(0)->get_Text();
}
```

## **Access Slide Comments**
This C++ code shows you how to access an existing comment on a slide in a PowerPoint presentation:

```cpp
// Instantiates the Presentation class
auto presentation = System::MakeObject<Presentation>(u"Comments1.pptx");

for (auto&& commentAuthor : presentation->get_CommentAuthors())
{
    auto author = System::ExplicitCast<CommentAuthor>(commentAuthor);
    for (auto&& comment1 : System::IterateOver(author->get_Comments()))
    {
        SmartPtr<Comment> comment = System::ExplicitCast<Comment>(comment1);
        Console::WriteLine(String(u"ISlide :")
                        + comment->get_Slide()->get_SlideNumber()
                        + u" has comment: " + comment->get_Text()
                        + u" with Author: " + comment->get_Author()->get_Name()
                        + u" posted on time :" + comment->get_CreatedTime() + u"\n");
    }
}
```


## **Reply Comments**
A parent comment is the top or original comment in a hierarchy of comments or replies. Using the [ParentComment](https://reference.aspose.com/slides/cpp/class/aspose.slides.i_comment#af3d18815e49ac0eccf38a33cde1ec5e0) property (from the [IComment](https://reference.aspose.com/slides/cpp/class/aspose.slides.i_comment) interface), you can set or get a parent comment. 

This C++ code shows you how to add comments and get replies to them:

```cpp
auto pres = System::MakeObject<Presentation>();

// Accesses ISlide 1
auto slide1 = pres->get_Slides()->idx_get(0);

// Adds a comment
auto author1 = pres->get_CommentAuthors()->AddAuthor(u"Author_1", u"A.A.");
auto comment1 = author1->get_Comments()->AddComment(u"comment1", slide1, PointF(10.0f, 10.0f), DateTime::get_Now());

// Adds a reply to comment1
auto author2 = pres->get_CommentAuthors()->AddAuthor(u"Autror_2", u"B.B.");
auto reply1 = author2->get_Comments()->AddComment(u"reply 1 for comment 1", slide1, PointF(10.0f, 10.0f), DateTime::get_Now());
reply1->set_ParentComment(comment1);

// Adds another reply to comment1
auto reply2 = author2->get_Comments()->AddComment(u"reply 2 for comment 1", slide1, PointF(10.0f, 10.0f), DateTime::get_Now());
reply2->set_ParentComment(comment1);

// Adds a reply to existing reply
auto subReply = author1->get_Comments()->AddComment(u"subreply 3 for reply 2", slide1, PointF(10.0f, 10.0f), DateTime::get_Now());
subReply->set_ParentComment(reply2);

auto comment2 = author2->get_Comments()->AddComment(u"comment 2", slide1, PointF(10.0f, 10.0f), DateTime::get_Now());
auto comment3 = author2->get_Comments()->AddComment(u"comment 3", slide1, PointF(10.0f, 10.0f), DateTime::get_Now());

auto reply3 = author1->get_Comments()->AddComment(u"reply 4 for comment 3", slide1, PointF(10.0f, 10.0f), DateTime::get_Now());
reply3->set_ParentComment(comment3);

// Displays the comments hierarchy on console
auto comments = slide1->GetSlideComments(nullptr);
for (int32_t i = 0; i < comments->get_Length(); i++)
{
    auto comment = comments[i];
    while (comment->get_ParentComment() != nullptr)
    {
        Console::Write(u"\t");
        comment = comment->get_ParentComment();
    }

    Console::Write(u"{0} : {1}", comments[i]->get_Author()->get_Name(), comments[i]->get_Text());
    Console::WriteLine();
}

pres->Save(u"parent_comment.pptx", SaveFormat::Pptx);

// Removes comment1 and all replies to it
comment1->Remove();

pres->Save(u"remove_comment.pptx", SaveFormat::Pptx);
```

{{% alert color="warning" title="Attention" %}} 

* When the [Remove](https://reference.aspose.com/slides/cpp/class/aspose.slides.i_comment#a8bb818ae804d142195c4edcf9012cccb) method (from the [IComment](https://reference.aspose.com/slides/cpp/class/aspose.slides.i_comment) interface) is used to delete a comment, the replies to the comment also get deleted. 
* If the [ParentComment](https://reference.aspose.com/slides/cpp/class/aspose.slides.i_comment#af3d18815e49ac0eccf38a33cde1ec5e0) setting results in a circular reference, [PptxEditException](https://reference.aspose.com/slides/cpp/namespace/aspose.slides#addf0421015ca476c0664c4f8f451877d) will be thrown.

{{% /alert %}}

## **Add a Modern Comment**

In 2021, Microsoft introduced *modern comments* in PowerPoint. The modern comments feature significantly improves collaboration in PowerPoint. Through modern comments, PowerPoint users get to resolve comments, anchor comments to objects and texts, and engage in interactions a lot more easily than before. 

In [Aspose Slides for C++ 21.11](https://docs.aspose.com/slides/cpp/aspose-slides-for-cpp-21-11-release-notes/), we implemented support for modern comments by adding the [ModernComment](https://reference.aspose.com/slides/cpp/class/aspose.slides.modern_comment) class. The [AddModernComment](https://reference.aspose.com/slides/cpp/class/aspose.slides.comment_collection#a3627fcb3b05cd639fd430bd8248fe66b) and [InsertModernComment](https://reference.aspose.com/slides/cpp/class/aspose.slides.comment_collection#ad11c3efb52f3c17f63238447dcc03c94) methods were added to the [CommentCollection](https://reference.aspose.com/slides/cpp/class/aspose.slides.comment_collection) class.

This C++ code shows you how to add a modern comment to a slide in a PowerPoint presentation: 

```cpp
auto pres = System::MakeObject<Presentation>();
// Accesses ISlide 1
auto slide1 = pres->get_Slides()->idx_get(0);

auto newAuthor = pres->get_CommentAuthors()->AddAuthor(u"Some Author", u"SA");
auto modernComment = newAuthor->get_Comments()->AddModernComment(u"This is a modern comment", slide1, nullptr, PointF(100.0f, 100.0f), DateTime::get_Now());

pres->Save(u"pres.pptx", SaveFormat::Pptx);
```

## **Remove a Comment**

### **Delete All Comments and Authors**

This C++ code shows you how to remove all comments and authors in a presentation:

```cpp
using namespace Aspose::Slides;
using namespace Aspose::Slides::Export;
using namespace System::Drawing;

auto presentation = System::MakeObject<Presentation>(u"example.pptx");

// Deletes all comments from the presentation
for (auto author : presentation->get_CommentAuthors())
{
    author->get_Comments()->Clear();
}
        
// Deletes all authors
presentation->get_CommentAuthors()->Clear();
presentation->Save(u"example_out.pptx", SaveFormat::Pptx);

```

### **Delete Specific Comments**

This C++ code shows you how to delete specific comments on a slide:

```cpp
using namespace Aspose::Slides;
using namespace Aspose::Slides::Export;
using namespace System::Drawing;

auto presentation = System::MakeObject<Presentation>();
auto slide = presentation->get_Slides()->idx_get(0);
        
// add comments...
auto author = presentation->get_CommentAuthors()->AddAuthor(u"Author", u"A");
author->get_Comments()->AddComment(u"comment 1", slide, PointF(0.2f, 0.2f), System::DateTime::get_Now());
author->get_Comments()->AddComment(u"comment 2", slide, PointF(0.3f, 0.2f), System::DateTime::get_Now());
        
// remove all comments that contain "comment 1" text
for (auto commentAuthor : presentation->get_CommentAuthors())
{
    auto toRemove = System::MakeObject<System::Collections::Generic::List<System::SharedPtr<IComment>>>();
    for (auto comment : slide->GetSlideComments(commentAuthor))
    {
        if (comment->get_Text() == u"comment 1")
        {
            toRemove->Add(comment);
        }
    }
    for (auto comment : toRemove)
    {
        commentAuthor->get_Comments()->Remove(comment);
    }
}
        
presentation->Save(u"pres.pptx", SaveFormat::Pptx);

```

## **FAQ**

### Does Aspose.Slides support a status like 'resolved' for modern comments?

Yes. [Modern comments](https://reference.aspose.com/slides/cpp/aspose.slides/moderncomment/) expose a [get_Status](https://reference.aspose.com/slides/cpp/aspose.slides/moderncomment/get_status/) and [set_Status](https://reference.aspose.com/slides/cpp/aspose.slides/moderncomment/set_status/) methods; you can read and set a [comment’s state](https://reference.aspose.com/slides/cpp/aspose.slides/moderncommentstatus/) (for example, mark it as resolved), and this state is saved in the file and recognized by PowerPoint.

### Are threaded discussions (reply chains) supported, and is there a nesting limit?

Yes. Each comment can reference its [parent comment](https://reference.aspose.com/slides/cpp/aspose.slides/comment/set_parentcomment/), enabling arbitrary reply chains. The API does not declare a specific nesting depth limit.

### In what coordinate system is a comment marker’s position defined on a slide?

The position is stored as a floating-point point in the slide’s coordinate system. This lets you place the comment marker precisely where you need it.