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Embedding Gecko Basics


Interfaces are abstract classes written in XPIDL, the Cross Platform Interface Definition Language. Yet to be useful the functionality promised in those interfaces must be implemented in some regular programming language. Facilitating this is the job of the XPIDL compiler. Once an interface is defined in an .idl file, it can be processed by the XPIDL compiler.

The compiler can be set to output a number of things, but generally the output is two-fold: a C++ .h file that includes a commented out template for a full C++ implementation of the interface and an XPT file that contains type library information which works with XPConnect to make the interface available to JavaScript. More information on the syntax of XPIDL (a simple C-like language) and the use of the compiler can be found at

Written by: Ellen Evans | Comments, questions, complaints? Bug 141350