Reading file as binary

[baws]

Im trying to learn D, lovely language for a C++ lover. I have a 
file Im trying to parse, but I need to read the contents as 
binary data. I also need help understanding how read() works. I'd 
like to read the first four bytes which identify the file header, 
I need it to show as a sequence of bytes, how can i output the 
first 4 bytes to show like 0xFFCF?

With my code, im getting the integer values, If i use 
cast(byte[]) on read and writefln("Reading header info: 0x%x", 
bytesRead[0]);

Ill only get the first byte 0xCF.


import std.stdio;
import std.file;
import std.array;

struct xsdhead{
    int head1;
    int head2;
    int numTables;
};

immutable int headerInfo1 = 0xFFCF;
immutable int headerInfo2 = 0x0002;

int main(string [] args){
    writeln("start");
    if(args[1] == null){
        writeln("pass a file");
        return 0;
    }
    auto file = args[1];
    writeln("Working on ", file);

    auto bytesRead =  cast(byte[]) read(file, 4);
    writefln("Reading header info: %s", bytesRead);
    writefln("Address of caret is: 0x%X", &bytesRead);

    return 0;
}