Copy extremely large buffer data from watch to a text file

So i have this very very large buffer of size 1296000 which i want to copy at the time of debug from my VS 2015 watch to a text file. The file stream or cout commands are not working thus left to do this manually.

interested to know if there is any quick way to copy all the buffer values i.e. [0] ...to...[1296000]... As of now when i try to do this my systems hangs and copying data in say multiple of 3000's or so is very time consuming.

i need to do this as this buffer / txt file will be used as input to my another code. Please suggest some quick way to use the watch windo in VS.