的Python：搜索/读取二进制数据 [英] Python: Searching/reading binary data

问题描述

我读在一个二进制文件（在这种情况下，一个jpg），并需要找到在该文件中的一些的值。对于那些有兴趣，二进制文件是一个JPG，我试图通过寻找二元结构<一挑出它的尺寸href=\"http://www.anttikupila.com/flash/getting-jpg-dimensions-with-as3-without-loading-the-entire-file/\">detailed这里。

I'm reading in a binary file (a jpg in this case), and need to find some values in that file. For those interested, the binary file is a jpg and I'm attempting to pick out its dimensions by looking for the binary structure as detailed here.

我需要找到FFC0二进制数据，直接跳到一定数量的字节，然后读取4个字节（这应该给我的图像尺寸）。

I need to find FFC0 in the binary data, skip ahead some number of bytes, and then read 4 bytes (this should give me the image dimensions).

什么是搜索二进制数据的价值的好办法？是否存在的查找等同或类似重？

What's a good way of searching for the value in the binary data? Is there an equivalent of 'find', or something like re?

推荐答案

其实你可以将文件加载到一个字符串，并使用

You could actually load the file into a string and use

s.find('\xff\xc0')

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