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#1 Posted : Tuesday, June 26, 2007 7:53:30 AM(UTC)


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Posts: 2


I need to be able to grab an image (jpeg) from an HTPP post save the original as well as a thumbnail of it. If I open the image from a file it works fins so I know the codecs is working fine. It also works correctly if I use the HttpPostedFile.SaveAs() on the InputStream.

When I try to convert to a stream and call the RasterCodecs.Load() method while passing in the stream I get the "Invalid file format" exception. I'm guessing that this may have to do with the contenttype or encoding or something but I am not sure.

If there is another way to do this in ASP.NET 2.0 that is great too. I am receiving an HTTP post from a Flash application so I don't have control over the Encoding types. I don't suspect this to be an issue because as I mentioned I can accept the post and write the file with the SaveAs() method fine.

I would greatly appreciate any help. Here is a code sample of what I am trying to do:

private void Upload()
HttpFileCollection files;
files = Page.Request.Files;

for (int index = 0; index < files.AllKeys.Length; index++)
HttpPostedFile pf = files[index];

int lastPos = pf.FileName.LastIndexOf('\\');
string[] fileName = pf.FileName.Substring(++lastPos).Split(new char[]{'.'});
string name = fileName[0];
string extension = fileName[1];
string path = MapPath("../images/");

Stream stream = pf.InputStream;

byte[]input = new byte[pf.ContentLength];

stream.Read(input, 0, pf.ContentLength);

//Check the file type through the extension
if (extension == "jpg" || extension =="jpeg" ||
extension == "gif" || extension == "png" ||
extension == "tiff")
Save(name, extension, path, stream, pf.ContentLength);

public void Save(string name, string extension, string path, Stream file, int size)
RasterCodecs codecs = new RasterCodecs();

// Get the file information
//CodecsImageInfo info = codecs.GetInformation(file, true);

// Load the first page only - This fails
RasterImage image = codecs.Load(file);

//This works
//RasterImage image = codecs.Load("C:\\Documents and Settings\\All Users\\Documents\\My Pictures\\Sample Pictures\\Sunset.jpg");

//Save the large format file to disk
codecs.Save(image, path + name + "." + extension, RasterImageFormat.Jpeg, 24);

//Resample and resize the preview for easy viewing
SizeCommand command = new SizeCommand();
command.Width = 128;
command.Height = 128;
command.Flags = RasterSizeFlags.Resample;

// Save the preview to disk
codecs.Save(image, path + name + "_preview." + extension, RasterImageFormat.Jpeg, 24);

// Clean Up

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#2 Posted : Wednesday, June 27, 2007 3:58:18 AM(UTC)

Adnan Ismail  

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Posts: 3,022

Was thanked: 2 time(s) in 2 post(s)

Did you seek to the beginning before performing load or save operation in the memory stream?

#3 Posted : Wednesday, June 27, 2007 7:44:36 AM(UTC)


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Posts: 2

Thanks for pointing me in the right direction. It had to do with not getting my stream built correctly.

All I did was put the HttpPostedFile.Inputstream into a Stream object.

Stream stream = pf.InputStream

I guess that allows it to buffer it in correctly? I had problems if I just tried to use the InputStream directly. Easy solution :)

#4 Posted : Tuesday, September 28, 2010 9:55:42 AM(UTC)

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Posts: 1

Hi, I also had this problem, but the solution that ended up working for me was just slightly different so I wanted to share.

"Stream stream = pf.InputStream;" did not work for me; I still got the dreaded "Invalid File Format" error.

Here's the line of code I ended up with:
MemoryStream s = new MemoryStream(fuUpload.FileBytes, false);

I'm not sure why the difference, but I hope this can help save time for others!
#5 Posted : Wednesday, December 22, 2010 12:50:31 PM(UTC)


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Posts: 6

The various RasterCodecs methods that use a stream (RasterCodecs.GetInformation/Load/Save), requires the stream to be seakable (Stream.CanSeek is true).

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