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Image png format?

I get an error when I add a png image to a slide.

Error: Input parameter incorrect

Does slides accept png format?


At first, I’d like to know what version of Aspose.Slides you use. Java or .Net?
Also please provide example how you add png image.

Thanks for the reply. I am using Here is the code. The same thing with .bmp works...


Dim pres As Presentation = New Presentation

'Adding an empty slide to the presentation and getting the reference of

'that empty slide

Dim slide As Slide = pres.AddEmptySlide()

'Adding a rectangle (X=2400, Y=1800, Width=1000 & Height=500) to the slide

Dim rect As Aspose.Slides.Rectangle = slide.Shapes.AddRectangle(2400, 1800, 1000, 500)

'Hiding the lines of rectangle

rect.LineFormat.ShowLines = False

'Adding a text frame to the rectangle with "Hello World" as a default text

rect.AddTextFrame("Hello World")

'Removing the first slide of the presentation which is always added by

'Aspose.Slides by default while creating the presentation




'Accessing a slide using its slide position

Dim slide2 As Slide = pres.GetSlideByPosition(2)

'Creating a picture object that will be used to fill the ellipse

Dim pic As Picture = New Picture(pres, "C:\\BarChart.png")

'Adding the picture object to pictures collection of the presentation

'After the picture object is added, the picture is given a uniqe picture Id

Dim picId As Integer = pres.Pictures.Add(pic)

'Calculating picture width and height

Dim pictureWidth As Integer = pres.Pictures(picId - 1).Image.Width * 4

Dim pictureHeight As Integer = pres.Pictures(picId - 1).Image.Height * 4

'Calculating slide width and height

Dim slideWidth As Integer = slide2.Background.Width

Dim slideHeight As Integer = slide2.Background.Height

'Calculating the width and height of picture frame

Dim pictureFrameWidth As Integer = Convert.ToInt32(slideWidth / 2 - pictureWidth / 2)

Dim pictureFrameHeight As Integer = Convert.ToInt32(slideHeight / 2 - pictureHeight / 2)

'Adding picture frame to the slide

slide2.Shapes.AddPictureFrame(picId, pictureFrameWidth, pictureFrameHeight, pictureWidth, pictureHeight)

'Writing the presentation as a PPT file


Code looks good. Probably .Net runtime can’t open your .png file. Try to open it with
standard System.Drawing.Bitmap class and check if you have the same exception.

It works fine with the bmp class.

Any ideas…

Why you think this problem is because of png image? Are you sure exception thrown when you load image?
I don’t see any useful information in the error message you posted.
Please provide fill error message with stacktrace and line numbers where exception was thrown.

Always use pres.Slides.Remove(pres.GetSlidesByPosition(1)) instead of pres.Slides.RemoveAt(0)

Code pres.Pictures(picId - 1) is wrong. You should use pres.Pictures.GetPictureById(picId).

Here is the stack trace and exception message. The above code is the one found in the documentation
to create a hello world ppt.

Invalid parameter used.

An unhandled exception occurred during the execution of the current web
request. Please review the stack trace for more information about the error and
where it originated in the code.

Exception Details:
System.ArgumentException: Invalid parameter used.


Line 73: 
Line 74: 'Creating a picture object that will be used to fill the ellipse
Line 75: Dim pic As Picture = New Picture(pres, "C:\\BarChart.png")
Line 76:
Line 77:

Source File: C:\Inetpub\wwwroot\TestImageExportToPPT.aspx.vb Line: 75

Stack Trace:

[ArgumentException: Invalid parameter used.]
System.Drawing.Image.FromStream(Stream stream, Boolean useEmbeddedColorManagement, Boolean validateImageData) +356
System.Drawing.Image.FromStream(Stream stream, Boolean useEmbeddedColorManagement) +13
System.Drawing.Image.FromStream(Stream stream) +7
Aspose.Slides.PPImage..ctor(Presentation parent, Stream stream, Boolean close_stream) +43
Aspose.Slides.Picture..ctor(Presentation parent, String file) +47
AnalysisWorkbench.TestImageExportToPPT.Page_Load(Object sender, EventArgs e) in C:\Inetpub\wwwroot\TestImageExportToPPT.aspx.vb:75
System.Web.UI.Control.OnLoad(EventArgs e) +67
System.Web.UI.Control.LoadRecursive() +35
System.Web.UI.Page.ProcessRequestMain() +750

Aspose.Slides uses this code to open image:

FileStream fs = new FileStream(file, FileMode.Open, FileAccess.Read);
Image img = Image.FromStream(stream);

As you see in the stacktrace exception thrown inside .net framework when it try to load image.
So it’s not a problem of Aspose.Slides.

Just for information. Image.FromStream() and Bitmap() constructor use absolutely the same code
to load images with only one difference. Image.FromStream validates image before loading and
check if it has any broken data.