如何在二进制文件中查找ANSI字符串？ [英] How to look for an ANSI string in a binary file?

问题描述

我想使用C ++在二进制文件中找到ANSI字符串的第一次出现。

I would like to find the first occurence of an ANSI string in a binary file, using C++.

我知道字符串类有一个方便的find函数，我不知道如何使用它，如果文件是大的，说5-10 MB。

I know the string class has a handy find function, but I don't know how can I use it if the file is big, say 5-10 MB.

我需要先将整个文件复制到内存中的字符串中吗？如果是，我如何确保二进制在复制时，字符被破坏？

Do I need to copy the whole file into a string in memory first? If yes, how can I be sure that none of the binary characters get corrupted while copying?

或者是否有更有效的方法来完成它，而不需要将其复制到字符串中？ / p>

Or is there a more efficient way to do it, without the need for copying it into a string?

推荐答案

我需要将整个文件复制到内存中的字符串中吗？

Do I need to copy the whole file into a string in memory first?

否。

Or is there a more efficient way to do it, without the need for copying it into a string?

当然，使用 std :: ifstream （请务必在二进制模式中打开，而不是文本模式），请创建一对 multi_pass 迭代器（来自 Boost ）。 精神），然后搜索字符串与 std :: search 。

Of course; open the file with an std::ifstream (be sure to open in binary mode rather than text mode), create a pair of multi_pass iterators (from Boost.Spirit) around the stream, then search for the string with std::search.

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