[Mono-dev] P/Invoking a VS2012 C++ DLL, DLL behavior is materially different in 3.2.3 than in 3.1 and .net

Dennis Fantoni dennis at fantoni.dk
Fri Sep 27 07:53:58 UTC 2013

(running on windows 7)

In short, if I wrote this in a dll in .net or mono 3.1  i would get to “this shows”

void tester() {
try {
cerr<<”this never shows”
cerr<<”this shows”

However, in 3.2.3 above code when called via Pinvoke, will display “this never shows” , indicating that the data structures used by the exception system inside the DLL has been damaged by mono.

I have created two VS2012 sample solutions to create a C# dll caller, and a C++ callee that exposes the problem – and filed a bug


If someone have the time to confirm or comment, I would be very pleased. If I am not mistaken it is a pretty severe bug – it might happen that any vs2012 c++ DLL that uses exceptions internally has ceased to work with mono on windows. (the problem might be bigger, I havent tried to build dll’s with VS2010 or other languages).

Anyways, I would expect mono to behave similar to .net, but it does not in this respect.



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