将writeablebitmap编码为jpeg，然后编码为base64string

Question

I am building a surface-rt app that takes a picture which results into a stream and a WriteableBitmap as this example shows I then encode the stream into a Base64String and pass it to a WebApi service where I store it in a server.

The same sample page suggests to encode the image into jpeg before saving as the resulting file will be quite large, now my question is can I/Should I encode the stream/writeableBitMap before enconding it into a base64string to reduce the traffic to the webapi service.

Disclaimer: I have very little experience handling images, thanks in advance.

Answer 1

The method described in the link you shared seems like the right approach for compressing a WriteableBitmap . You do want to compress the captured image to make it smaller. The only remaining part is encoding it as Base64 which you can do using Convert.ToBase64String() . The one thing I would consider is to use something like BackgroundUploader.CreateUploadFromStreamAsync() to upload the stream. In that case you might not want to do the Base64 encoding part on the client side, but perhaps do it on the server instead. I'm not an http expert, but Base64 makes your data larger and I'd suspect there might be faster ways to upload bits these days than using Base64 and also your Base64-encoded string might end up being Base64-encoded twice - making the transmitted data larger yet.