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Howto:Add new fgcommands to FlightGear: Difference between revisions
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Howto:Add new fgcommands to FlightGear (view source)
Revision as of 13:03, 10 February 2012
, 10 February 2012→Exception handling
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To be on the safe side, complex fgcommands should make use of exception handling to catch exceptions and deal with them gracefully, so that they cannot affect the simulator critically. | To be on the safe side, complex fgcommands should make use of exception handling to catch exceptions and deal with them gracefully, so that they cannot affect the simulator critically. | ||
This is accomplished by using standard C++ try/catch blocks, usually catching an sg_exception. The SG_LOG() macro can be used to print debugging information to the console. If you'd like to display error information using the native FlightGear GUI, you can use the "guiErrorMessage(const char*,sg_exception)". | This is accomplished by using standard C++ try/catch blocks, usually catching an sg_exception. The SG_LOG() macro can be used to print debugging information to the console. If you'd like to display error information using the native FlightGear GUI, you can use the "guiErrorMessage(const char*,sg_exception)" helper. | ||
For example, see the callback function "do_preferences_load" in [http://gitorious.org/fg/flightgear/blobs/next/src/Main/fg_commands.cxx#line445 line 445]: | For example, see the callback function "do_preferences_load" in [http://gitorious.org/fg/flightgear/blobs/next/src/Main/fg_commands.cxx#line445 line 445]: | ||