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Problem in download file (pdf or xls) using DownloadAction class

 
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Hi guys, I am trying to download a file using DownloadAction class. It's not throwing any error. I am able to download the file but the downloaded file is being shown empty. For using DownloadAction class we need to extend it and implement getStreamInfo method. I am not extending my action class directly but I am instantiating a class in my action class which, in turn, is extending DownloadAction class and defining getStreamInfo function. Can this be a problem? I am using the following code snippet for downloading :

 
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Have you solved your problem?
It requires to see your DownloadAction class with its action method, plus FileStreamInfo class.
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