Dart Read support for binary files

Question

there exist some sample code for an Http Server in the Dart:io section.

Now I will distribute images with this server. To achieve this, I read the requested image file and send its content to the client via request.response.write().

The problem is the format of the read data: Either I read the image file as 16bit-String or as Byte Array. Neither of them is compatible to a raw 8-bit array, which I have to send to the client.

May someone help me?

Answer 1

There exist several kinds of write-methods in the response class.

1. write
2. writeCharCode
3. add

While "write" writes the data 'as seen', "writeCharCode" transforms the data back to raw-format. However, writeCharCode prepends some "magic byte" (C2) at the beginning, so it corrupts the data.

Another function, called add( List < int > ) processes the readAsBytes-result as desired.

Best regards, Alex