117 lines
3.4 KiB
Markdown
117 lines
3.4 KiB
Markdown
#capnpc-python-cpp
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More thorough docs are available at [http://jparyani.github.io/capnpc-python-cpp/](http://jparyani.github.io/capnpc-python-cpp/).
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## Requirements
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First you need a system-wide installation of the Cap'n Proto C++ library >= 0.3. Follow the [official installation docs](http://kentonv.github.io/capnproto/install.html) or for the lazy:
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```bash
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wget http://capnproto.org/capnproto-c++-0.3.0-rc5.tar.gz
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tar xzf capnproto-c++-0.3.0-rc5.tar.gz
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cd capnproto-c++-0.3.0-rc5
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./configure
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make -j8 check
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sudo make install
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```
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A recent version of cython and setuptools is also required. You can install these with:
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```bash
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pip install -U cython
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pip install -U setuptools
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```
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## Building and installation
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Install with `pip install capnp`. You can set the CC environment variable to control the compiler version, ie `CC=gcc-4.8 pip install capnp`.
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Or you can clone the repo like so:
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git clone https://github.com/jparyani/capnpc-python-cpp.git
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`cd` into the repo directory and run `pip install .`
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## Development
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This project uses [git-flow](http://jeffkreeftmeijer.com/2010/why-arent-you-using-git-flow/). Essentially, just make sure you do your changes in the `develop` branch.
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## Documentation/Example
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There is some basic documentation [here](http://jparyani.github.io/capnpc-python-cpp/).
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The examples directory has one example that shows off the capabilities quite nicely. Here it is, reproduced:
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```python
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import capnp
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addressbook = capnp.load('addressbook.capnp')
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def writeAddressBook(fd):
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message = capnp.MallocMessageBuilder()
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addressBook = message.initRoot(addressbook.AddressBook)
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people = addressBook.initPeople(2)
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alice = people[0]
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alice.id = 123
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alice.name = 'Alice'
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alice.email = 'alice@example.com'
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alicePhones = alice.initPhones(1)
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alicePhones[0].number = "555-1212"
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alicePhones[0].type = 'mobile'
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alice.employment.school = "MIT"
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bob = people[1]
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bob.id = 456
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bob.name = 'Bob'
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bob.email = 'bob@example.com'
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bobPhones = bob.initPhones(2)
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bobPhones[0].number = "555-4567"
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bobPhones[0].type = 'home'
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bobPhones[1].number = "555-7654"
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bobPhones[1].type = 'work'
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bob.employment.unemployed = None
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capnp.writePackedMessageToFd(fd, message)
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f = open('example', 'w')
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writeAddressBook(f.fileno())
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def printAddressBook(fd):
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message = capnp.PackedFdMessageReader(f.fileno())
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addressBook = message.getRoot(addressbook.AddressBook)
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for person in addressBook.people:
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print person.name, ':', person.email
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for phone in person.phones:
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print phone.type, ':', phone.number
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which = person.employment.which()
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print which
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if which == 'unemployed':
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print('unemployed')
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elif which == 'employer':
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print('employer:', person.employment.employer)
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elif which == 'school':
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print('student at:', person.employment.school)
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elif which == 'selfEmployed':
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print('self employed')
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print
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f = open('example', 'r')
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printAddressBook(f.fileno())
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```
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## Common Problems
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If you get an error on installation like:
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...
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gcc-4.8: error: capnp/capnp.c: No such file or directory
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gcc-4.8: fatal error: no input files
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Then you have too old a version of setuptools. Run `pip install -U setuptools` then try again.
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[](https://travis-ci.org/jparyani/capnpc-python-cpp)
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