Just package:haskell-gi-base

This will catch just a specific GError exception. If you need to catch a range of related errors, catchGErrorJustDomain is probably more appropriate. Example:

do image <- catchGErrorJust PixbufErrorCorruptImage
loadImage
(\errorMessage -> do log errorMessage
return mssingImagePlaceholder)

Catch all GErrors from a particular error domain. The handler function should just deal with one error enumeration type. If you need to catch errors from more than one error domain, use this function twice with an appropriate handler functions for each.

catchGErrorJustDomain
loadImage
(\err message -> case err of
PixbufErrorCorruptImage -> ...
PixbufErrorInsufficientMemory -> ...
PixbufErrorUnknownType -> ...
_ -> ...)

A verson of handleGErrorJust with the arguments swapped around.

A verson of catchGErrorJustDomain with the arguments swapped around.

When the given value is of "Just a" form, execute the given action, otherwise do nothing.