Monkeybread Xojo plugin - The module CallDelegateCrashSafeMBS

Platforms to show: All Mac Windows Linux Cross-Platform

The module CallDelegateCrashSafeMBS

module CallDelegateCrashSafeMBS

Type	Topic	Plugin	Version	macOS	Windows	Linux	iOS	Targets
module	Process	MBS Util Plugin	23.0	✅ Yes	✅ Yes	✅ Yes	✅ Yes	All

The module to call a delegate and catch a crash.

Example

Try
  
  System.DebugLog "Try the call..."
  
  CallDelegateCrashSafeMBS AddressOf TestMethod
  
  System.DebugLog "Call succeeded!"
  
Catch c As DelegateCrashExceptionMBS
  
  System.DebugLog "Caught exception!"
  System.DebugLog c.Message
  
End Try

We can catch the following conditions:

Invalid pointer access
Invalid instruction
Floating point exception
Wrong system call
Broken pipe
Bus error

We may crash ourselves on stack corruption and we print the stack trace to stderr for macOS and Linux for debugging.

If a crash is caught, there may be memory leaked as objects allocated in the called method are not freed. The call function can not be used recursively and only on one thread at the time.

method CallDelegateCrashSafeMBS(m as DelegateCrashSafeMBS)
method PrintBacktraceMBS
property CallCounter as Integer
property CrashCounter as Integer
delegate DelegateCrashSafeMBS()

Some examples which use this module:

/Util/Crash Delegate Test

Blog Entries

Xojo Developer Magazine

Release notes

Version 25.0
- Improved CallDelegateCrashSafeMBS class to catch more low level exceptions on Windows like Access violation and illegal instruction.
Version 23.1
- Improved CallDelegateCrashSafeMBS to catch trace trap signals and C++ exceptions.
- Improved CallDelegateCrashSafeMBS to check for stack corruption and prevent recursion.
Version 23.0
- Added CallDelegateCrashSafeMBS module and method to call crashing method and get an DelegateCrashExceptionMBS.

The items on this page are in the following plugins: MBS Util Plugin.

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