File copying and getting file contents

So I am trying to get the file contents and send them via socket.write().

I am not entirely sure, if I'm doing this right, but  I was trying this:

var file = new File( "D:\\test.png" );
var file2 = new File( "D:\\test2.png" );

file.open("r");
file2.open("w");
file2.encoding = file.encoding;


do {
    file2.write(file.readch());
}
while ( !file.eof )

test.png exists and test2.png is created from scratch. And the files were not identical in the end. Which means, that getting the file contents with file.readch() or file.read() isn't the right solution. Right?

So, how do I get the file contents in some format, that can be send, and then, probably, rebuilt at the other end?