visual c++ - C# code not catching SEHExceptions -

i have c# application invokes managed c++ dll deliberately accesses invalid address; enabled seh exceptions in c++ project, added _se_translator_function c++ code , added signal handler when sigsegv occurs. using c++ code purely native test, works perfectly, when invoke c++ code .net app, app crashes a:

unhandled exception: system.accessviolationexception: attempted read or write protected memory. indication other memory corrupt.

   @ k.killnative() in c:\users\ebascon\documents\visual studio 2013\projects\consoleapplication3\consoleapplication4\source.cpp:line 32 

this c# console app:

namespace consoleapplication3 {     class program {         static void main(string[] args) {             try {                 var k = new nativekiller();                 k.kill();             }             catch (exception ex) {                 console.writeline("catching " + ex);             }         }     } } 

and c++/cli code invoked:

void mxxexceptiontranslator(unsigned int, struct _exception_pointers*) {     throw std::exception("crash happens"); }  void killnative() {     try {         _set_se_translator(mxxexceptiontranslator);          signal(sigsegv, [](int) {             puts("exception");             exit(-1);         });          int* p = reinterpret_cast<int*>(0xdeadbeef);         printf("%d\n", *p);     }     catch (...) { //removing catch not change         puts("doing nothing");     } }  public ref class nativekiller { public:     void kill() {         killnative();     } }; 

what think doing wrong? in real world problem, need c++/cli process (that bridge legacy app) log error message , die gracefully instead of popping "the program stopped working" window.

thanks in advance,

ernesto

this kind of problem have, helps discover not building code correctly. c++/cli compiler pretty powerful, too powerful, , can translate native code il. exact same kind of il c# compiler generates. , treated same @ runtime, jitter translates machine code @ runtime.

this not want. native c or c++ code ought translated directly machine code compiler. msdn article _set_se_translator() decent job of warning this:

when using _set_se_translator managed code (code compiled /clr) or mixed native , managed code, aware translator affects exceptions generated in native code only. managed exceptions generated in managed code (such when raising system::exception) not routed through translator function.

the usual way fall in pit of success compiling native code separately in own source file or library project. easier take advantage of c++/cli compiler's ability dynamically switch back-and-forth between il , machine code generation in single source file. fix:

#pragma managed(push, off) void mxxexceptiontranslator(unsigned int, struct _exception_pointers*) { ... } void killnative() { ... } #pragma managed(pop)  public ref class nativekiller { ... } 

and you'll see exception translator works fine.