author | martin.trojer@nokia.com |
Fri, 31 Jul 2009 15:01:17 +0100 | |
changeset 1 | 2fb8b9db1c86 |
permissions | -rw-r--r-- |
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Example Python extension for Windows NT |
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======================================= |
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This directory contains everything needed (except for the Python |
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distribution!) to build a Python extension module using Microsoft VC++. |
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Notice that you need to use the same compiler version that was used to build |
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Python itself. |
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The simplest way to build this example is to use the distutils script |
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'setup.py'. To do this, simply execute: |
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% python setup.py install |
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after everything builds and installs, you can test it: |
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% python -c "import example; example.foo()" |
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Hello, world |
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See setup.py for more details. alternatively, see below for instructions on |
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how to build inside the Visual Studio environment. |
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Visual Studio Build Instructions |
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================================ |
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These are instructions how to build an extension using Visual C++. The |
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instructions and project files have not been updated to the latest VC |
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version. In general, it is recommended you use the 'setup.py' instructions |
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above. |
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It has been tested with VC++ 7.1 on Python 2.4. You can also use earlier |
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versions of VC to build Python extensions, but the sample VC project file |
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(example.dsw in this directory) is in VC 7.1 format. |
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COPY THIS DIRECTORY! |
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-------------------- |
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This "example_nt" directory is a subdirectory of the PC directory, in order |
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to keep all the PC-specific files under the same directory. However, the |
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example_nt directory can't actually be used from this location. You first |
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need to copy or move it up one level, so that example_nt is a direct |
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sibling of the PC\ and Include\ directories. Do all your work from within |
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this new location -- sorry, but you'll be sorry if you don't. |
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OPEN THE PROJECT |
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---------------- |
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From VC 7.1, use the |
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File -> Open Solution... |
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dialog (*not* the "File -> Open..." dialog!). Navigate to and select the |
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file "example.sln", in the *copy* of the example_nt directory you made |
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above. |
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Click Open. |
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BUILD THE EXAMPLE DLL |
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--------------------- |
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In order to check that everything is set up right, try building: |
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1. Select a configuration. This step is optional. Do |
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Build -> Configuration Manager... -> Active Solution Configuration |
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and select either "Release" or "Debug". |
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If you skip this step, you'll use the Debug configuration by default. |
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2. Build the DLL. Do |
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Build -> Build Solution |
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This creates all intermediate and result files in a subdirectory which |
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is called either Debug or Release, depending on which configuration you |
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picked in the preceding step. |
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TESTING THE DEBUG-MODE DLL |
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-------------------------- |
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Once the Debug build has succeeded, bring up a DOS box, and cd to |
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example_nt\Debug. You should now be able to repeat the following session |
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("C>" is the DOS prompt, ">>>" is the Python prompt) (note that various |
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debug output from Python may not match this screen dump exactly): |
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C>..\..\PCbuild\python_d |
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Adding parser accelerators ... |
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Done. |
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Python 2.2c1+ (#28, Dec 14 2001, 18:06:39) [MSC 32 bit (Intel)] on win32 |
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Type "help", "copyright", "credits" or "license" for more information. |
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>>> import example |
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[7052 refs] |
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>>> example.foo() |
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Hello, world |
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[7052 refs] |
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>>> |
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TESTING THE RELEASE-MODE DLL |
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---------------------------- |
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Once the Release build has succeeded, bring up a DOS box, and cd to |
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example_nt\Release. You should now be able to repeat the following session |
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("C>" is the DOS prompt, ">>>" is the Python prompt): |
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C>..\..\PCbuild\python |
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Python 2.2c1+ (#28, Dec 14 2001, 18:06:04) [MSC 32 bit (Intel)] on win32 |
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Type "help", "copyright", "credits" or "license" for more information. |
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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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Congratulations! You've successfully built your first Python extension |
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module. |
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CREATING YOUR OWN PROJECT |
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------------------------- |
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Choose a name ("spam" is always a winner :-) and create a directory for |
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it. Copy your C sources into it. Note that the module source file name |
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does not necessarily have to match the module name, but the "init" function |
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108 |
name should match the module name -- i.e. you can only import a module |
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109 |
"spam" if its init function is called "initspam()", and it should call |
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Py_InitModule with the string "spam" as its first argument (use the minimal |
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example.c in this directory as a guide). 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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113 |
"spam.dll" or "spam.pyd" (the latter is supported to avoid confusion with a |
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114 |
system library "spam.dll" to which your module could be a Python interface) |
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in Release mode, or spam_d.dll or spam_d.pyd in Debug mode. |
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116 |
|
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Now your options are: |
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118 |
|
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119 |
1) Copy example.sln and example.vcproj, rename them to spam.*, and edit them |
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120 |
by hand. |
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121 |
|
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122 |
or |
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123 |
|
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124 |
2) Create a brand new project; instructions are below. |
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125 |
|
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126 |
In either case, copy example_nt\example.def to spam\spam.def, and edit the |
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new spam.def so its second line contains the string "initspam". If you |
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128 |
created a new project yourself, add the file spam.def to the project now. |
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(This is an annoying little file with only two lines. An alternative |
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approach is to forget about the .def file, and add the option |
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131 |
"/export:initspam" somewhere to the Link settings, by manually editing the |
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"Project -> Properties -> Linker -> Command Line -> Additional Options" |
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133 |
box). |
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134 |
|
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135 |
You are now all set to build your extension, unless it requires other |
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136 |
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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138 |
|
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139 |
|
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140 |
CREATING A BRAND NEW PROJECT |
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141 |
---------------------------- |
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142 |
Use the |
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143 |
File -> New -> Project... |
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144 |
dialog to create a new Project Workspace. Select "Visual C++ Projects/Win32/ |
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Win32 Project", enter the name ("spam"), and make sure the "Location" is |
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146 |
set to parent of the spam directory you have created (which should be a direct |
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147 |
subdirectory of the Python build tree, a sibling of Include and PC). |
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In "Application Settings", select "DLL", and "Empty Project". Click OK. |
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149 |
|
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150 |
You should now create the file spam.def as instructed in the previous |
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151 |
section. Add the source files (including the .def file) to the project, |
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152 |
using "Project", "Add Existing Item". |
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153 |
|
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154 |
Now open the |
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155 |
Project -> spam properties... |
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156 |
dialog. (Impressive, isn't it? :-) You only need to change a few |
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157 |
settings. Make sure "All Configurations" is selected from the "Settings |
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158 |
for:" dropdown list. Select the "C/C++" tab. Choose the "General" |
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159 |
category in the popup menu at the top. Type the following text in the |
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160 |
entry box labeled "Addditional Include Directories:" |
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161 |
|
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162 |
..\Include,..\PC |
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163 |
|
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164 |
Then, choose the "General" category in the "Linker" tab, and enter |
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165 |
..\PCbuild |
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166 |
in the "Additional library Directories" box. |
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167 |
|
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168 |
Now you need to add some mode-specific settings (select "Accept" |
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169 |
when asked to confirm your changes): |
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170 |
|
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171 |
Select "Release" in the "Configuration" dropdown list. Click the |
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172 |
"Link" tab, choose the "Input" Category, and append "python24.lib" to the |
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173 |
list in the "Additional Dependencies" box. |
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174 |
|
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175 |
Select "Debug" in the "Settings for:" dropdown list, and append |
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176 |
"python24_d.lib" to the list in the Additional Dependencies" box. Then |
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177 |
click on the C/C++ tab, select "Code Generation", and select |
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178 |
"Multi-threaded Debug DLL" from the "Runtime library" dropdown list. |
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179 |
|
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180 |
Select "Release" again from the "Settings for:" dropdown list. |
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181 |
Select "Multi-threaded DLL" from the "Use run-time library:" dropdown list. |
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182 |
|
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183 |
That's all <wink>. |