C# RESPONSE BINARYWRITE PDF

This is rendered in the browser window. IO; using System. Write byteArray, 0, byteArray. NET, meaning it can be accessed directly.

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By using our site, you acknowledge that you have read and understand our Cookie Policy , Privacy Policy , and our Terms of Service. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I have an app that needs to read a PDF file from the file system and then write it out to the user. When I use the code at the bottom the browser gets a file KB and I get a message from Acrobat Reader saying the file is damaged and cannot be repaired.

You may inadvertently be sending other content back after Response. BinaryWrite which may confuse the browser. End will ensure that that the browser only gets what you really intend.

We've used this with a lot of success. Since you're sending the file directly from your filesystem with no intermediate processing, why not use Response. TransmitFile instead? I suspect that your problem is caused by a missing Response. End , meaning that you're sending the rest of your page's content appended to the PDF data. It is not recommended to call Response. Close or Response. End - instead use CompleteRequest.

Please read this before using Response. In my MVC application, I have enabled gzip compression for all responses. If you are reading this binary write from an ajax call with gzipped responses, you are getting the gzipped bytearray rather than original bytearray that you need to work with.

To fix this, you have a choice to either prevent gzipping this binary data so that you can properly turn it into the file that you are downloading, or you have to decompress that gzipped data in your javascript code before you turn it into a file. But only if the handler was returning from an ASPX page. It seemed running from an ASHX this was not required. Learn more. Reading a binary file and using Response. BinaryWrite Ask Question. Asked 11 years ago. Active 2 years, 5 months ago. Viewed 76k times.

Here is my code I've also tried using File. Clear ; Response. AddHeader "content-disposition", String. GetFileName path ; Response. GetExtension path. Substring 1 ; Response. Mo Patel 2, 4 4 gold badges 19 19 silver badges 33 33 bronze badges.

Are you seeing KB in the code sample you provided fs. Length , or at the other end when you read this back in? After I get the file back I checked the size, I was forgetting to put a Response.

End on there as pointed out by BarneyHDog. This is not entirely related but deals with the filename you add to the header. Not sure it's fixed now but Chrome would produce a "Duplicate Headers" warning for me when the file name contained a comma in it until I changed the header to the following: context.

Here's a link to the reference: What is the "Duplicate Headers" Warning? Active Oldest Votes. Try adding Response. End ; after the call to Response. This is kind of flushing the buffer. Very important, because every byte counts to make the stream valid. This worked for me: Response.

BinaryWrite myBites ; Response. End ; Response. BinaryWrite bytes ; Response. Flush ; Response. Close ; Response. End ; This works for us. AddHeader "Content-Disposition", String. GetFileName Path ; Response. WriteFile path ; Response.

End ;. Robin Day Robin Day This was exactly what I needed. TransmitFile path ; Response. End ; I suspect that your problem is caused by a missing Response. LukeH LukeH k 48 48 gold badges silver badges bronze badges. ClearHeaders ; Response. SetCacheability HttpCacheability. NoCache ; Response. AppendHeader "Content-Length", bytes. ToString ; this. CompleteRequest ;. Nils Nils 7 7 silver badges 16 16 bronze badges.

I kept getting OutputStream is not available when a custom TextWriter is used and by modifying my code similar to yours fixed part of my issue. Faisal Faisal 21 1 1 bronze badge. Maybe you are missing a Response. Igor Zelaya Igor Zelaya 3, 4 4 gold badges 30 30 silver badges 49 49 bronze badges.

BuildPdf id ; return return this. PDF byteArray, "test. AddHeader "content-disposition", string. AddHeader "Content-Length", pdfBytes. BinaryWrite byteArray ; HttpContext. Mr Zachary Mr Zachary 11 2 2 bronze badges. In addition to Igor's Response. Close , I would add a Response.

I also found it necessary to add the following: Response. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Podcast JavaScript is ready to get its own place. Featured on Meta. What posts should be escalated to staff using [status-review], and how do I…. We're switching to CommonMark.

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By using our site, you acknowledge that you have read and understand our Cookie Policy , Privacy Policy , and our Terms of Service. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I have an app that needs to read a PDF file from the file system and then write it out to the user. When I use the code at the bottom the browser gets a file KB and I get a message from Acrobat Reader saying the file is damaged and cannot be repaired. You may inadvertently be sending other content back after Response.

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ASP and ASP.NET - Write data directly to a browser without creating a local copy

For best value, consider purchasing a Red Carpet Subscription [ learn more ]. NET - Write data directly to a browser without creating a local copy This KB entry provides details about how to write data directly to a browser without creating a local copy e. We appreciate your feedback. If you have any questions, comments, or suggestions about this entry please contact our support team at kb nsoftware. Authentication and Encryption.

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Response.BinaryWrite Method

This method is useful for writing nonstring information, such as binary data required by a custom application. If you have an object that generates an array of bytes, you can use the following call to BinaryWrite to send the bytes to a custom application:. An ASP application uses internal server buffers when writing data to the client, irrespective of the value of Response. As the application is writing data synchronously, the data buffer can be reused when the BinaryWrite function returns, while the server is writing the data asynchronously to the client. The server, in turn, makes a copy of the data into its internal buffers. As a result of this buffering, the ASP application should not try to send unreasonable amounts of data in a single BinaryWrite , but rather break it into fragments so as to avoid running out of buffer space.

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