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pnunn%netscape.com
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<!doctype html public "-//w3c//dtd html 4.0 transitional//en">
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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<meta name="Author" content="pnunn">
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<meta name="GENERATOR" content="Mozilla/4.5 [en]C-NSCP (WinNT; U) [Netscape]">
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<title>xpCom FAQ</title>
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</head>
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<body>
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<b><font size=+3>XPCOM FAQ</font></b>
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<p>Get out your decoder rings kids!
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<p>Having a basic understanding of COM is only the first
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<br>step. To get CMonkey code to build and run,
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<br>you need to translate your COM ideas into Netscape
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<br>speak.
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<p>Feel free to add to this document or change incorrect info.
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<br>Hopefully more info and more examples will help new
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<br>people reach XPCOM nirvana more quickly.
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<p><b>To mentally translate XPCOM to COM.</b>
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<br>
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<table BORDER COLS=2 WIDTH="100%" >
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<tr>
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<td BGCOLOR="#CCCCCC"><b>vanilla COM</b></td>
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<td BGCOLOR="#FFCCCC"><b>XPCOM</b></td>
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</tr>
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<tr>
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<td BGCOLOR="#CCCCCC"> IUnknown</td>
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<td BGCOLOR="#FFCCCC">nsISupports</td>
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</tr>
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<tr>
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<td BGCOLOR="#CCCCCC">IClassFactory</td>
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<td BGCOLOR="#FFCCCC">nsIFactory</td>
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</tr>
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<tr>
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<td BGCOLOR="#CCCCCC">virtual void _stdcall</td>
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<td BGCOLOR="#FFCCCC">NS_IMETHOD</td>
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</tr>
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<tr>
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<td BGCOLOR="#CCCCCC">interface ID = IID</td>
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<td BGCOLOR="#FFCCCC">nsID = nsIID = IID</td>
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</tr>
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<tr>
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<td BGCOLOR="#CCCCCC">class ID = CLSID </td>
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<td BGCOLOR="#FFCCCC">nsCID = CID</td>
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</tr>
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</table>
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<p>Not too difficult.
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<br>But wait. There's more.
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<br><b>-------------------------------------------</b>
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<p><b><font size=+1>Why don't those classes have AddRef?</font></b>
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<p>Actually, those classes do have AddRef. It is hidden
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<br>in a macro. There are alot of macros that are alot of help
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<br>once you know :
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<br> 1) They exist.
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<p> 2) Where they are defined. (They aren't always mnemonic
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or onomatipeic.
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<br>
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You might want to print them out.)
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<p> mozilla/xpcom/public/nsCom.h
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<br>
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mozilla/xpcom/public/nsISupports.h
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<p> 3)What they are
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<br>
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Here's a short list to give you an idea of what you've been missing.
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<br>
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The include files listed above are the real reference.
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<p> 4) A quick way to expand pesky macros:
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<br>
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For macros in foo.cpp, 'make foo.i'
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<p> This
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will pump the foo.cpp file through C preprocessing
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<br>
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and expand all the macros for you. The output can be
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<br>
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hard to read, but if you search for unique strings
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<br>
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in the area you aredebugging, you can navigate
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<br>
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the file pretty easily.
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<br>
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(thanks to hshaw@netscape.com)
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<br>
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<br>
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<br>
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<table BORDER COLS=2 WIDTH="100%" BGCOLOR="#CCCCCC" >
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<tr>
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<td BGCOLOR="#FFCCCC"><b><font size=+1>Netscape MACRO</font></b></td>
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<td><b><font size=+1>Expansion of macro</font></b></td>
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</tr>
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<tr>
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<td BGCOLOR="#FFCCCC">NSADDREF(factoryinstname)</td>
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<td>Factory->AddRef();</td>
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</tr>
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<tr>
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<td BGCOLOR="#FFCCCC">NS_IMETHOD</td>
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<td>virtual nsresult __stdcall</td>
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</tr>
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<tr>
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<td BGCOLOR="#FFCCCC">NS_INIT_REFCNT()</td>
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<td>mRefCnt = 0</td>
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</tr>
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<tr>
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<td BGCOLOR="#FFCCCC">NS_INIT_ISUPPORTS()</td>
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<td>NS_INIT_REFCNT()</td>
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</tr>
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<tr>
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<td BGCOLOR="#FFCCCC">NS_DECL_ISUPPORTS</td>
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<td>public:
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<br> NS_IMETHOD QueryInterface(REFNSIID
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aIID,
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<br>
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void** aInstancePtr);
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<br> NS_IMETHOD_(nsrefcnt)
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AddRef(void);
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<br> NS_IMETHOD_(nsrefcnt)
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Release(void);
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<br> protected:
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<br> nsrefcnt mRefCnt;</td>
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</tr>
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</table>
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<p> <font size=+1>Useful Links to COM Documents:</font>
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<p><a href="http://www.mozilla.org/projects/xpcom/">XPCOM Page</a>
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<br><a href="http://www.mozilla.org/projects/xpcom/nsCOMPtr.html">nsCOMPtr</a>
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<br><a href="http://warp.netscape.com/client/raptor/codingconventions.html">Coding
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Conventions</a>
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<br><a href="http://warp/client/bam/eng/howto.html">Getting BAMmed</a>
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<br><a href="http://warp/client/bam/eng/comdoc.html">How to COM</a>
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<br><a href="http://www.mozilla.org/docs/tplist/catFlow/modunote.htm">Modularization
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Techniques</a>
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<br><a href="http://www.mozilla.org/docs/tplist/catBuild/portable-cpp.html">C++
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Portability Guide</a>
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<br><a href="http://www.mozilla.org/newlayout/">NGLayout</a>
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<br>
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<br>
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<br>
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</body>
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</html>
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