datatype=d

integer[1], integer[2], integer[4], integer[8], float[4], float[8]. These types represent hardware data types. The integer[n] is an n byte integer, and float[n] is an n byte float.  If datatype is not specified, it defaults to integer[1].

byteorder=b

- big and little specify big endian and little endian, respectively

- network specifies the network ordering (big endian)

- native uses the native byte ordering

If byteorder is not specified, then it defaults to network.

If file is the name of a file that has not previously been opened, ReadFile attempts to open the file before reading the data. In this case, ReadFile will also close the file after reading.

An error is raised if file is not a valid descriptor or if it is the name of a file that does not exist.