The WCK HexView Widget
September 7, 2003 | Fredrik Lundh
This class implements a simple “hexdump” viewer, based on the ListView classes introduced in the Displaying Large Amounts of Data article.
File: wckHexView.py
from ListView import ListView import re ## # Model class class HexModel: # turns a file into a list of (offset, 16-byte chunk) items def __init__(self, file): self.file = open(file, "rb") self.file.seek(0, 2) # seek to end of file self.size = self.file.tell() def __getitem__(self, index): offset = index * 16 self.file.seek(offset) return offset, self.file.read(16) def __len__(self): return (self.size + 15) / 16 ## # View class class HexView(ListView): # simple viewer ui_option_width = 8 + 1 + 16*3 + 16 ui_option_font = "courier" def repair_item(self, draw, xy, item): offset, data = item # build hexdump string text = ["%08x" % offset] for char in data: text.append("%02x" % ord(char)) if len(text) < 17: text.extend([" "]*(17-len(text))) text.append(re.sub("[\x00-\x1f\x7f-\xbf]", ".", data)) draw.text(xy, " ".join(text), self.font)
Here’s how to use this class:
from Tkinter import * root = Tk() root.title("WCK") scrollbar = Scrollbar(root) scrollbar.pack(side=RIGHT, fill=Y) listbox = HexView(root, yscrollcommand=scrollbar.set) listbox.pack(expand=1, fill=BOTH) scrollbar.config(command=listbox.yview) model = HexModel("bigfile.dat") listbox.setdata(model) mainloop()
Note that the file must be wrapped in a HexModel class; you can create your own model class if you want to dump data from other sources.
Notes
To simplify usage, you could add a setfile helper method to the HexView class:
def setfile(self, file):
self.setdata(HexModel(file))
Alternatively, you can override and extend the ui_handle_config method to add support for a file option. Don’t forget to call the ui_handle_config implementation in the parent class before returning control to the WCK.
For a more extensive hex viewer/editor widget, see Michael Peuser’s wckhex (dead link) widget class.
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