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.NET Forum / ASP.NET / General / November 2009WAV File not downloading properly
I have a application that stores a wav file into the database. I retrieve the wav file through a web service call that gets the file. When I try to send the file through the response stream it seems the file gets changed. If I save the file to disk it works properly. Here is my latest endeavor Response.ClearContent(); Response.AddHeader("Content-Disposition", "attachment; filename=" + "test.wav"); BinaryWriter bw = new BinaryWriter(Response.OutputStream); bw.Write(objPromptStorageOut.promptwave); bw.Close(); Response.ContentType = ATACUtility.getMimeFromFile (objPromptStorageOut.promptwave); Response.End(); The file that gets downloaded is 2 times the size of the original file. Here is how I write it to disk using (BinaryWriter binWriter = new BinaryWriter(File.Open(@"C: \nater.wav", FileMode.Create))) { binWriter.Write(objPromptStorageOut.promptwave); } that currently works. Use rather http://msdn.microsoft.com/en-us/library/system.web.httpresponse.binarywrite.aspx Keep in mind that the Response outputstream is intended to write "characters" and applies the encoding defined in your web.config file. Response.BinaryWrite will write the bytes without any encoding... -- Patrice > Use ratherhttp://msdn.microsoft.com/en-us/library/system.web.httpresponse.binar... > [quoted text clipped - 5 lines] > -- > Patrice Thank you for your reply. I have tried your suggestion and it still did not work. Here is what I tried: Response.AddHeader("Content-Disposition", "attachment; filename=" + "nate.wav"); Response.BinaryWrite(objPromptStorageOut.promptwave); Response.Flush(); Response.End(); and that generated a file of 155,365 bytes when the original file was 80,120 if I add Response.ContentType = "audio/wav"; Response.AddHeader("Content-Length", (objPromptStorageOut.promptwave.Length).ToString()); then I get the correct file size but the file is unplayable. Could it be a similar encoding problem when you read the file ? How do you read the file in objPromptStorageOut.PromptWave ? My approach would be to validate each step that is : - to start by streaming a well known byte array (let's take 16 bytes such as 0x00 up to 0xf0). You'll easily see if it works and moreover if it doesn't work you'll be able to quickly check what changed in the content. - if it works read the same content from a file. If it doesn't work you'll know you have a problem in how you read the file. - then once that work, it should work with the actual file. -- Patrice > Could it be a similar encoding problem when you read the file ? How do you > read the file in objPromptStorageOut.PromptWave ? [quoted text clipped - 8 lines] > -- > Patrice The file is stored in blob column in an oracle database, I have a web service that returns the byte array back. If I write the file directly to the disk in the web service it plays, if I write it directly to the disk on the website it works, the only thing that doesn't work is when I try to send the file in the response. When I look at the first bytes of the file, I get the correct header for the wav file. I will try with a smaller file and see where it is going wrong. Nate > > Could it be a similar encoding problem when you read the file ? How do you > > read the file in objPromptStorageOut.PromptWave ? [quoted text clipped - 18 lines] > > Nate Can it be a problem with authorization? http://forums.asp.net/p/1243133/2276691.aspx#2276691 If it doesn't help try to set "application/x-msdownload" instead if "audio/wav", this is a special type that should prompt the user with an open-or-save dialog. Response.AddHeader("content-disposition", "attachment; filename=test.wav") Response.ContentType = "application/x-msdownload" Response.BinaryWrite... > > > Could it be a similar encoding problem when you read the file ? How do you > > > read the file in objPromptStorageOut.PromptWave ? [quoted text clipped - 29 lines] > Response.ContentType = "application/x-msdownload" > Response.BinaryWrite... I created a test project with only the hyper link and the same calls and that seemed to work. I am going to say it has something to do with the security or something else on the page that is changing the response. I tried changing the file to grant all users access to the aspx file and that did not work. > I created a test project with only the hyper link and the same calls > and that seemed to work. I am going to say it has something to do with > the security or something else on the page that is changing the > response. I tried changing the file to grant all users access to the > aspx file and that did not work. Looks a tough one. Now I would try to use a blob wiht those 16 values 0x0 to 0xf0 and see how it behaves. Save the file on disk and use an hexa file viewer to see what was changed in the file... Good luck. -- Patrice > > > > Could it be a similar encoding problem when you read the file ? How do you > > > > read the file in objPromptStorageOut.PromptWave ? [quoted text clipped - 37 lines] > > - Show quoted text - One thing I forgot to mention is that the ClearContent method does not clear header information. If you do not use Clear or ClearHeaders before calling ClearContent then add Response.ClearHeaders() to ensure that no other headers are sent with the current response. Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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