Hello, I have noticed that for certain format strings, struct.unpack expects the wrong number of bytes. For example, this works fine
header = "4si4s4si2h2i3h4s" data = list(unpack(header,f.read(42))) however, this header = "4si4s4si2h2i3h4si" data = list(unpack(header,f.read(46))) returns the following error: struct.error: unpack requires a string argument of length 48 So even though my format string includes an additional 4-byte integer, unpack is expecting 6 additional bytes. Here's a simpler example: This works: header = "s" data = list(unpack(header,f.read(1))) however this: header = "si" data = list(unpack(header,f.read(5))) throws struct.error: unpack requires a string argument of length 8 So unpack expects 7 additional bytes when an integer is added to the format string. Does anyone know what is going on? I am using Debian stable, so my Python version is 2.5.2. But I have replicated this with 2.6.2. Here's my proc/version: Linux version 2.6.30-bpo.1-amd64 (Debian 2.6.30-1~bpo50+1) (no...@debian.org) (gcc version 4.3.2 (Debian 4.3.2-1.1) ) #1 SMP Fri Jun 26 09:41:55 UTC 2009 Any help would be greatly appreciated. Cheers, Tim -- http://mail.python.org/mailman/listinfo/python-list
