Get file info before upload

[Kennet]

How can I get info from the file I selecct before I upload it.

Example I only want to upload picture bigger than a specific size, or in my case upload mp3 with a specific bitrate?

[Ivan]

Hello Kennet,

Thank you for your interest in the RadUpload control.

The upload control provide some basic filters right of the box - MaxFileCount, MaxFileSize, MaxUploadSize. If you need some more sophisticated filter then you should rely on the FileSelected event - here you can access the FileInfo structure for all the selected files. In the attached example we are filtering against the minimum size of 4kB.

Please give it a try and let us know if there are more questions.

Sincerely yours,
Ivan
the Telerik team

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[Kennet]

Thanks,

But is there any way to access the file from Silverlight before uploading it, I can't get the path for the file?

In this case I want to read some info from a MP3 file, like the bitrate, and only upload files with a certain bitrate.

for (int index = e.SelectedFiles.Count; index-- > 0; )
            {


                RadUploadSelectedFile file = e.SelectedFiles[index];

                MP3Header mp3hdr = new MP3Header();
                bool boolIsMP3 = mp3hdr.ReadMP3Information(file.File.Name);
                if (boolIsMP3)
                {
                    lbox1.Items.Add(mp3hdr.strFileName);
                    lbox1.Items.Add(mp3hdr.lngFileSize.ToString());
                    lbox1.Items.Add(mp3hdr.intBitRate.ToString());
                    lbox1.Items.Add(mp3hdr.intFrequency.ToString());
                    lbox1.Items.Add(mp3hdr.strMode);
                    lbox1.Items.Add(mp3hdr.strLengthFormatted);
                    lbox1.Items.Add(mp3hdr.intLength.ToString());
                    lbox1.Items.Add("===========================");
                }
}

The MP3 Class is found here:

http://www.devhood.com/tutorials/tutorial_details.aspx?tutorial_id=79

[Ivan]

Hello Kennet,

In the Silverlight environment you can not access the file's full name - this is a security limitation of the Framework. The good news is that there is a way to read data from a local file - you should operate in FilesUpload even handler - relying on the FileInfo structure (supplied by the Silverlight). Below is a sample code:

private void radUpload_FilesSelected(object sender, FilesSelectedEventArgs e)
{
    foreach (RadUploadSelectedFile radFile in e.SelectedFiles)
    {
        FileInfo fileInfo = radFile.File;
        Stream fileStream = fileInfo.OpenRead();
        long fileSize = fileStream.Length;
        int bufferSize = 4096;
        byte[] buffer = new byte[bufferSize];
        for (int position = 0; position < fileSize; )
        {
            int delta = fileStream.Read(buffer, position, bufferSize);
            if (delta > 0)
            {
                // Process your data here;
            }
            position += delta;
        }
        fileStream.Close();
    }
}

We hope this information will help you.

Best wishes,
Ivan
the Telerik team

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Watch a video on how to optimize your support resource searches and check out more tips on the blogs.