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61 lines
2.4 KiB
HTML
61 lines
2.4 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN">
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<HTML>
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<HEAD>
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<TITLE>Pd Documentation 4</TITLE>
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<meta http-equiv="Content-Type" content="text/html">
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<link rel="stylesheet" type="text/css" href="pdmanual.css" media="screen">
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</HEAD>
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<BODY>
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<H2>Pd Documentation chapter 4: writing Pd objects in C</H2>
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<P>
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<A href="index.htm#s4"> back to table of contents </A>
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<BR><BR>
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</P>
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<P>You can write your own objects that you and others can use in their Pd
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applications. You can write them in C or (if you're smart and brave) in C++ or
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FORTRAN.
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<P> HOW EXTERNS ARE LOADED
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<P> Whenever you type the name of an object
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(into an "object" text box) that Pd doesn't yet know about, Pd looks for a
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relocatable object file, named, for instance, "profile.pd_irix5". Pd looks
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first in the directory containing the patch, then in directories in its
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"path." Pd will then add whatever object is defined there to its "class list,"
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which is the set of all Pd classes you can use. If all this works, Pd then
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attempts again to create the object you asked for, this time perhaps
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successfully. There is no difference between an object defined this way and an
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object built into Pd.
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<P> Once you load a new object into Pd, it's there for the duration of your Pd
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session. If you load another Pd document which supplies a different version of
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some Pd object, the object won't be updated. IF you're working on a new object
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and decide to change it, you have to exit and re-enter Pd to get the change to
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take.
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<P> In the "externs" subdirectory of the documentation you
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can find simple examples of "externs" with their source code and test patches;
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there are many other on the web (see <a href="x1.htm#s2">section 1.2 </A>).
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<P> Iohannes Zmoelnig has written an excellent guide to writing externs at
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<A href="http://iem.kug.ac.at/pd/externals-HOWTO/">
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http://iem.kug.ac.at/pd/externals-HOWTO/</A> .
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<P> A paper by Theo Stojanov on the subject is at:
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<A href="http://www.music.mcgill.ca/~theo/html/audio/pd_externs.pdf">
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http://www.music.mcgill.ca/~theo/html/audio/pd_externs.pdf </A> .
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<P> NT HINT: In NT, Pd is compiled using Visual C 6.0. If you have VC 5.x
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your externs won't compile against Pd; you'll get an error about "disk full
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or bad DLL." Simply recompile Pd under 5.x and the problem goes away. Externs
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compiled under 5.x and 6.x are binary compatible; it's just the compilation
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that's sensitive.
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</BODY>
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</HTML>
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