我怎样才能读取从C蟒蛇咸菜数据库/文件？

问题描述

我的工作与几个音乐播放器整合。此刻我最喜欢的是exaile。

I am working on integrating with several music players. At the moment my favorite is exaile.

在新版本中它们从sqlite3的数据库格式迁移到内部味酸格式。我想知道是否有访问咸菜格式的文件，而无需逆向工程手工格式的方法。

In the new version they are migrating the database format from SQLite3 to an internal Pickle format. I wanted to know if there is a way to access pickle format files without having to reverse engineer the format by hand.

我知道是cPickle的Python模块，但我不知道，如果它是直接调用从C。

I know there is the cPickle python module, but I am unaware if it is callable directly from C.

推荐答案

有一个叫我帮助维持这可能是有用的PicklingTools库：它可以让​​你形成的数据结构在C ++中，你可以再泡菜/ unpickle ...这是C ++，不是C，但是这不应该是一个问题，这些天（假设你正在使用的GCC / G ++套件）。

There is a library called the PicklingTools which I help maintain which might be useful: it allows you to form data structures in C++ that you can then pickle/unpickle ... it is C++, not C, but that shouldn't be a problem these days (assuming you are using the gcc/g++ suite).

该库是一个普通的C ++库（有示出如何使用在从C ++和Python的插座和文件库中的分布内的C ++中的例子和Python），但在一般情况下，酸洗的文件的基础知识可用

The library is a plain C++ library (there are examples of C++ and Python within the distribution showing how to use the library over sockets and files from both C++ and Python), but in general, the basics of pickling to files is available.

其基本思想是PicklingTools库为您提供了从C蟒蛇般的数据结构+ +，这样你就可以序列化和反序列化到/ Python的/ C ++。 （？）所有基本类型：整型，长整型，字符串，无，复杂的，dictionarys，列表，有序字典和元组的支持。很少有钩子做自定义类，但是这部分是有点不成熟：库的其余部分是pretty稳定，一直活跃了8年。

The basic idea is that the PicklingTools library gives you "python-like" data structures from C++ so that you can then serialize and deserialize to/from Python/C++. All (?) the basic types: int, long int,string, None, complex, dictionarys, lists, ordered dictionaries and tuples are supported. There are few hooks to do custom classes, but that part is a bit immature: the rest of the library is pretty stable and has been active for 8 (?) years.

简单的例子：

#include "chooseser.h"
int main()
{
  Val a_dict = Tab("{ 'a':1, 'b':[1,2.2,'three'], 'c':None }");
  cout << a_dict["b"][0];  // value of 1

  // Dump to a file
  DumpValToFile(a_dict, "example.p0", SERIALIZE_P0);

  // .. from Python, can load the dictionary with pickle.load(file('example.p0'))

  // Get the result back
  Val result;
  LoadValFromFile(result, "example.p0", SERIALIZE_P0);
  cout << result << endl;
}

有是在网站上更多的文件（常见问题解答和用户指南）。

There is further documentation (FAQ and User's Guide) on the web site.

希望这是有用的：

Gooday，

里奇

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