Difference between revisions of "XPCOM"
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| − | + | Paul St-Denis & Michael Lau | |
| + | |||
| + | = Short Description = | ||
| + | XPCOM stands for Cross Platform Component Object Model. XPCOM is a framework for developing cross platform software. | ||
| + | |||
| + | = Detailed Discussion = | ||
| + | XPCOM is a framework for developing cross platform software that can be written in C, C++, JavaScript with extensions for Perl and Python. It supports any platform with a C++ compiler. | ||
| + | |||
| + | |||
| + | You can access the XPCOM component through the web or any Mozilla application (similar to the idea of accessing web services). | ||
| + | |||
| + | |||
| + | Some of the tools needed for development are: | ||
| + | * a C++ compiler | ||
| + | * a Perl interpreter | ||
| + | * some GNU tools | ||
| + | |||
| + | |||
| + | XPCOM provides the following features for cross platform development: | ||
| + | * Component management | ||
| + | * File abstraction | ||
| + | * Object message passing | ||
| + | * Memory management | ||
| + | |||
| + | |||
| + | Application that want to access Mozilla XPCOM libraries can use an XPCOM layer called XPConnect. | ||
| + | |||
| + | = External Links = | ||
| + | *[http://developer.mozilla.org/en/docs/XPCOM_API_Reference#Overview API Reference] | ||
| + | *[http://developer.mozilla.org/en/docs/XPCOM MDC - XPCOM] | ||
| + | *[http://www-128.ibm.com/developerworks/webservices/library/co-xpcom.html IBM - An introduction to XPCOM] | ||
| + | *[http://en.wikipedia.org/wiki/XPCOM Wikipedia - XPCOM] | ||
| + | *[http://kb.mozillazine.org/File_IO MozillaZine - File IO Sample] | ||
| + | *[http://lxr.mozilla.org/seamonkey/source/netwerk/base/src/nsFileStreams.h#77 LXR - nsFileInputStream.h] | ||
| + | |||
| + | = Examples = | ||
| + | [http://lxr.mozilla.org/seamonkey/source/netwerk/base/src/nsFileStreams.h#77 nsFileInputStream on LXR] Sample code for XPCOM component | ||
| + | <pre> | ||
| + | 77 class nsFileInputStream : public nsFileStream, | ||
| + | 78 public nsIFileInputStream, | ||
| + | 79 public nsILineInputStream | ||
| + | 80 { | ||
| + | 81 public: | ||
| + | 82 NS_DECL_ISUPPORTS_INHERITED | ||
| + | 83 NS_DECL_NSIINPUTSTREAM | ||
| + | 84 NS_DECL_NSIFILEINPUTSTREAM | ||
| + | 85 NS_DECL_NSILINEINPUTSTREAM | ||
| + | 86 | ||
| + | 87 // Overrided from nsFileStream | ||
| + | 88 NS_IMETHOD Seek(PRInt32 aWhence, PRInt64 aOffset); | ||
| + | 89 | ||
| + | 90 nsFileInputStream() : nsFileStream() | ||
| + | 91 { | ||
| + | 92 mLineBuffer = nsnull; | ||
| + | 93 mBehaviorFlags = 0; | ||
| + | 94 } | ||
| + | 95 virtual ~nsFileInputStream() | ||
| + | 96 { | ||
| + | 97 Close(); | ||
| + | 98 } | ||
| + | ... | ||
| + | 135 nsresult Reopen() { return Open(mFile, mIOFlags, mPerm); } | ||
| + | 136 }; | ||
| + | </pre> | ||
| + | |||
| + | Sample use of XPCOM component | ||
| + | <pre> | ||
| + | var fstream = Components.classes["@mozilla.org/network/file-input-stream;1"] | ||
| + | .createInstance(Components.interfaces.nsIFileInputStream); | ||
| + | </pre> | ||
Revision as of 12:19, 4 October 2006
Paul St-Denis & Michael Lau
Short Description
XPCOM stands for Cross Platform Component Object Model. XPCOM is a framework for developing cross platform software.
Detailed Discussion
XPCOM is a framework for developing cross platform software that can be written in C, C++, JavaScript with extensions for Perl and Python. It supports any platform with a C++ compiler.
You can access the XPCOM component through the web or any Mozilla application (similar to the idea of accessing web services).
Some of the tools needed for development are:
- a C++ compiler
- a Perl interpreter
- some GNU tools
XPCOM provides the following features for cross platform development:
- Component management
- File abstraction
- Object message passing
- Memory management
Application that want to access Mozilla XPCOM libraries can use an XPCOM layer called XPConnect.
External Links
- API Reference
- MDC - XPCOM
- IBM - An introduction to XPCOM
- Wikipedia - XPCOM
- MozillaZine - File IO Sample
- LXR - nsFileInputStream.h
Examples
nsFileInputStream on LXR Sample code for XPCOM component
77 class nsFileInputStream : public nsFileStream,
78 public nsIFileInputStream,
79 public nsILineInputStream
80 {
81 public:
82 NS_DECL_ISUPPORTS_INHERITED
83 NS_DECL_NSIINPUTSTREAM
84 NS_DECL_NSIFILEINPUTSTREAM
85 NS_DECL_NSILINEINPUTSTREAM
86
87 // Overrided from nsFileStream
88 NS_IMETHOD Seek(PRInt32 aWhence, PRInt64 aOffset);
89
90 nsFileInputStream() : nsFileStream()
91 {
92 mLineBuffer = nsnull;
93 mBehaviorFlags = 0;
94 }
95 virtual ~nsFileInputStream()
96 {
97 Close();
98 }
...
135 nsresult Reopen() { return Open(mFile, mIOFlags, mPerm); }
136 };
Sample use of XPCOM component
var fstream = Components.classes["@mozilla.org/network/file-input-stream;1"]
.createInstance(Components.interfaces.nsIFileInputStream);
