On 5 feb, 01:51, Mastastealth <[EMAIL PROTECTED]> wrote: > I'm trying to create a program to read a certain binary format. I have > the format's spec which goes something like: > > First 6 bytes: String > Next 4 bytes: 3 digit number and a blank byte > --- > Next byte: Height (Number up to 255) > Next byte: Width (Number up to 255) > Next byte: Number 0 - 5 > Every 2 bytes after that: Supposedly a number 0000 - 0899? > > Anyway, I'm able to do the first 2 objects fine: > > a = info.read(6) > b = info.read(4) > > Printing both gives me what I mentioned above, a string and a 3 digit > number with a space. However, as I continue, things get trickier. > > c = info.read(1) > d = info.read(1) > > Printing c and d in this case gives me a block in the SPE output, or > if I run in a DOS prompt, 2 funny symbols. How do I get an integer out > of this? I'll probably need help once I get to the "every 2 byte" > section, but that'll be a separate post.
Using the struct module http://docs.python.org/lib/module-struct.html import struct data = info.read(15) str1, str2, blank, height, width, num2, num3 = struct.unpack("6s3s1cBBBh", data) Consider this like a "first attempt", open issues: is the data little- endian or big-endian? does the 0-5 mean 0x00-0x05 or "0"-"5"? the last numbers are 2-byte binary integers, or 0000-0899 might indicate BDC? But building the right format is surely faster and easier than parsing the data by hand. -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
