Open and Save Presentation in Google Cloud Storage
4 Feb 202512 minutes to read
Prerequisites
-
Google cloud storage is required.
-
Service account is required.
-
Service account key is required.
Open Presentation from Google Cloud Storage
Steps to open a Presentation from Google Cloud Storage.
Step 1: Create a new ASP.NET Core Web Application (Model-View-Controller).
Step 2: Name the project.
Step 3: Install the following Nuget packages in your application from NuGet.org.
Step 4: Add a new button in the Index.cshtml as shown below.
@{Html.BeginForm("EditDocument", "Home", FormMethod.Get);
{
<div>
<input type="submit" value="Edit Document" style="width:150px;height:27px" />
</div>
}
Html.EndForm();
}Step 5: Include the following namespaces in HomeController.cs.
using Google.Apis.Auth.OAuth2;
using Google.Cloud.Storage.V1;
using Syncfusion.Presentation;Step 6: Include the below code snippet in HomeController.cs to open a Presentation from Google Cloud Storage.
public async Task<IActionResult> EditDocument()
{
//Download the file from Google
MemoryStream memoryStream = await GetDocumentFromGoogle();
//Create an instance of PowerPoint Presentation file
using (IPresentation pptxDocument = Presentation.Open(memoryStream))
{
//Get the first slide from the PowerPoint presentation
ISlide slide = pptxDocument.Slides[0];
//Get the first shape of the slide
IShape shape = slide.Shapes[0] as IShape;
//Change the text of the shape
if (shape.TextBody.Text == "Company History")
shape.TextBody.Text = "Company Profile";
//Saving the PowerPoint to a MemoryStream
MemoryStream outputStream = new MemoryStream();
pptxDocument.Save(outputStream);
//Download the PowerPoint file in the browser
FileStreamResult fileStreamResult = new FileStreamResult(outputStream, "application/powerpoint");
fileStreamResult.FileDownloadName = "EditPowerPoint.pptx";
return fileStreamResult;
}
}Download file from Google cloud storage
This is the helper method to download Presentation from Google cloud storage.
/// <summary>
/// Download file from Google
/// </summary>
/// <returns></returns>
public async Task<MemoryStream> GetDocumentFromGoogle()
{
try
{
//Your bucket name
string bucketName = "Your_bucket_name";
//Your service account key file path
string keyPath = "credentials.json";
//Name of the file to download from the Google Cloud Storage
string fileName = "PowerPointTemplate.pptx";
//Create Google Credential from the service account key file
GoogleCredential credential = GoogleCredential.FromFile(keyPath);
//Instantiates a storage client to interact with Google Cloud Storage
StorageClient storageClient = StorageClient.Create(credential);
//Download a file from Google Cloud Storage
MemoryStream memoryStream = new MemoryStream();
await storageClient.DownloadObjectAsync(bucketName, fileName, memoryStream);
memoryStream.Position = 0;
return memoryStream;
}
catch (Exception ex)
{
Console.WriteLine($"Error retrieving document from Google Cloud Storage: {ex.Message}");
throw; // or handle the exception as needed
}
}You can download a complete working sample from GitHub.
By executing the program, you will get the Presentation as follows.
Save Presentation to Google Cloud Storage
Steps to save a Presentation to Google Cloud Storage.
Step 1: Create a new ASP.NET Core Web Application (Model-View-Controller).
Step 2: Name the project.
Step 3: Install the following Nuget packages in your application from NuGet.org.
Step 4: Add a new button in the Index.cshtml as shown below.
@{Html.BeginForm("UploadDocument", "Home", FormMethod.Get);
{
<div>
<input type="submit" value="Upload Document" style="width:150px;height:27px" />
</div>
}
Html.EndForm();
}Step 5: Include the following namespaces in HomeController.cs.
using Google.Apis.Auth.OAuth2;
using Google.Cloud.Storage.V1;
using Syncfusion.Presentation;Step 6: Include the below code snippet in HomeController.cs to save a Presentation to Google Cloud Storage.
public async Task<IActionResult> UploadDocument()
{
//Create a new instance of PowerPoint Presentation file
IPresentation pptxDocument = Presentation.Create();
//Add a new slide to file and apply background color
ISlide slide = pptxDocument.Slides.Add(SlideLayoutType.TitleOnly);
//Specify the fill type and fill color for the slide background
slide.Background.Fill.FillType = FillType.Solid;
slide.Background.Fill.SolidFill.Color = ColorObject.FromArgb(232, 241, 229);
//Add title content to the slide by accessing the title placeholder of the TitleOnly layout-slide
IShape titleShape = slide.Shapes[0] as IShape;
titleShape.TextBody.AddParagraph("Company History").HorizontalAlignment = HorizontalAlignmentType.Center;
//Add description content to the slide by adding a new TextBox
IShape descriptionShape = slide.AddTextBox(53.22, 141.73, 874.19, 77.70);
descriptionShape.TextBody.Text = "IMN Solutions PVT LTD is the software company, established in 1987, by George Milton. The company has been listed as the trusted partner for many high-profile organizations since 1988 and got awards for quality products from reputed organizations.";
//Add bullet points to the slide
IShape bulletPointsShape = slide.AddTextBox(53.22, 270, 437.90, 116.32);
//Add a paragraph for a bullet point
IParagraph firstPara = bulletPointsShape.TextBody.AddParagraph("The company acquired the MCY corporation for 20 billion dollars and became the top revenue maker for the year 2015.");
//Format how the bullets should be displayed
firstPara.ListFormat.Type = ListType.Bulleted;
firstPara.LeftIndent = 35;
firstPara.FirstLineIndent = -35;
//Add another paragraph for the next bullet point
IParagraph secondPara = bulletPointsShape.TextBody.AddParagraph("The company is participating in top open source projects in automation industry.");
//Format how the bullets should be displayed
secondPara.ListFormat.Type = ListType.Bulleted;
secondPara.LeftIndent = 35;
secondPara.FirstLineIndent = -35;
//Gets a picture as stream
FileStream pictureStream = new FileStream("Image.jpg", FileMode.Open);
//Adds the picture to a slide by specifying its size and position.
slide.Shapes.AddPicture(pictureStream, 499.79, 238.59, 364.54, 192.16);
//Add an auto-shape to the slide
IShape stampShape = slide.Shapes.AddShape(AutoShapeType.Explosion1, 48.93, 430.71, 104.13, 80.54);
//Format the auto-shape color by setting the fill type and text
stampShape.Fill.FillType = FillType.None;
stampShape.TextBody.AddParagraph("IMN").HorizontalAlignment = HorizontalAlignmentType.Center;
//Saves the PowerPoint to MemoryStream
MemoryStream stream = new MemoryStream();
pptxDocument.Save(stream);
//Upload the file to Google
await UploadDocumentToGoogle(stream);
return Ok("PowerPoint uploaded to Google Cloud Storage.");
}Upload file to Google cloud storage
This is the helper method to upload Presentation to Google cloud storage.
/// <summary>
/// Upload file to Google
/// </summary>
/// <param name="stream"></param>
/// <returns></returns>
public async Task<MemoryStream> UploadDocumentToGoogle(MemoryStream stream)
{
try
{
//Your bucket name
string bucketName = "Your_bucket_name";
//Your service account key file path
string keyPath = "credentials.json";
//Name of the file to upload to Google Cloud Storage
string fileName = "CreatePowerPoint.pptx";
//Create Google Credential from the service account key file
GoogleCredential credential = GoogleCredential.FromFile(keyPath);
//Instantiates a storage client to interact with Google Cloud Storage
StorageClient storageClient = StorageClient.Create(credential);
//Uploads a file to Google Cloud Storage
storageClient.UploadObject(bucketName, fileName, null, stream);
Console.WriteLine("Upload completed successfully");
}
catch (Exception e)
{
Console.WriteLine("Unknown encountered on server. Message:'{0}' when writing an object", e.Message);
}
return stream;
}You can download a complete working sample from GitHub.
By executing the program, you will get the Presentation as follows.
