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119 lines
5.3 KiB
Plaintext
119 lines
5.3 KiB
Plaintext
Example Python extension for Windows NT
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=======================================
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This directory contains everything you need to build a Python
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extension module using Microsoft VC++ 4.x ("Developer Studio"), except
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for the Python distribution. It has been tested most recently with
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version 4.2. (Yes, it has been tested with the latest Python 1.5a3.)
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The "example_nt" subdirectory should be an immediate subdirectory of
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the Python source directory -- a direct sibling of Include and PC, in
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particular, which are referenced as "..\Include" and "..\PC". In
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other words, it should *not* be used "as is". Copy or move it up one
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level or you will regret it! (This is done to keep all the PC
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specific files inside the PC subdirectory of the distribution, where
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they belong.)
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It is also assumed that the build results of Python are in the
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directory ..\vc40. In particular, the python15.lib file is referred
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to as "..\vc40\python15.lib". If you have problems with this file,
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the best thing to do is to delete it from the project and add it
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again.
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In order to use the example project from Developer Studio, use the
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"File->Open Workspace..." dialog (*not* the "File->Open..." dialog!).
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Change the pattern to "*.mak" and select the file "example.mak". Now
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choose "File->Save All" and the othe project files will be created.
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In order to check that everything is set up right, try building:
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choose "Build->Build example.dll". This creates all intermediate and
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result files in a subdirectory which is called either Debug or Release
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depending on which configuration you have chosen (as distributed,
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Debug is selected as the default configuration).
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Once the build has succeeded, test the resulting DLL. In a DOS
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command window, chdir to that directory. You should now be able to
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repeat the following session "(C>" is the DOS prompt, ">>>" is the
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Python prompt):
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C> ..\..\vc40\python.exe
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>>> import example
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>>> example.foo()
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Hello, world
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>>>
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Creating the project
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--------------------
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There are two ways to use this example to create a project for your
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own module. First, choose a name ("spam" is always a winner :-) and
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create a directory for it. Copy your C sources into it. Note that
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the module source file name does not necessarily have to match the
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module name, but the "init" function name should match the module name
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-- i.e. you can only import a module "spam" if its init function is
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called "initspam()", and it should call Py_InitModule with the string
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"spam" as its first argument. By convention, it lives in a file
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called "spam.c" or "spammodule.c". The output file should be called
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"spam.dll" or "spam.pyd" (the latter is supported to avoid confusion
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with a system library "spam.dll" to which your module could be a
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Python interface).
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Now your options are:
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1) Clone example.mak. Start by copying example_nt\example.mak to
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spam\spam.mak. Do a global edit on spam.mak, replacing all
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occurrences of the string "example" by "spam", and all occurrences of
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"DEP_CPP_EXAMP" by something like "DEP_CPP_SPAM". You can now use
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this makefile to create a project file by opening it as a workspace
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(you have to change the pattern to *.mak first).
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2) Create a brand new project; instructions are below.
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In both cases, copy example_nt\example.def to spam\spam.def, and edit
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spam\spam.def so its second line contains the string "initspam". If
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you created a new project yourself, add the file spam.def to the
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project now.
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You are now all set to build your extension, unless it requires other
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external libraries, include files, etc. See Python's Extending and
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Embedding manual for instructions on how to write an extension.
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Creating a brand new project
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----------------------------
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If you don't feel comfortable with editing Makefiles, you can create a
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brand new project from scratch easily.
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Use the "File->New..." dialog to create a new Project Workspace.
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Select Dynamic-Link Library, enter the name ("spam"), and make sure
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the "Location" is set to the spam directory you have created (which
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should be a direct subdirectory of the Python build tree). Select
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Win32 as the platform (in my version, this is the only choice). Click
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"Create".
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Now open the "Build->Settings..." dialog. (Impressive, isn't it? :-)
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You only need to change a few settings. Make sure you have both the
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Debug and the Release configuration selected when you make the first
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change. Select the "C/C++" tab. Choose the "Preprocessor" category
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in the popup menu at the top. Type the following text in the entry
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box labeled "Addditional include directories:"
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..\Include,..\PC
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You must also change the run-time library. This must be done
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separately for the Release and Debug configurations. Choose the "Code
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Generation" category in the C/C++ tab. In the box labeled "Use
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run-time library", choose "Multithreaded DLL" for the Release
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configuration, and "Debug Multithreaded DLL" for the Debug
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configuration. That's all.
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You should now first create the file spam.def as instructed in the
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previous section.
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Now chose the "Insert->Files into Project..." dialog. Set the pattern
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to *.* and select both spam.c and spam.def and click OK. (Inserting
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them one by one is fine too.) Using the same dialog, choose the file
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..\vc40\python15.lib and insert it into the project.
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