Trouble passing _EXCEPTION_POINTERS * using FileMapping

Question

I wanted to do a out-of-process exception handler and i had created a watch-dog process which does dedicated exception handling when child process raises exception. I had succes

Answer 1

I will put this together as an answer, although it really should be a comment to Hans's answer (and the comments there) but it seems some explanation is necessary:

The code posted in the question correctly passes the value(s) of the struct mytest structure into shared memory.

The second code snippet:

(For ex)Process 2 :

cout << passdata->except->ExceptionRecord->ExceptionCode << endl ;

Shows a misunderstanding though: While you can read the value of the pointer passdata.except, in process 2 this is just an arbitrary 32/64 bit value, it is not a valid pointer.

You can pass this to MiniDumpWriteDump, this function will eveluate this pointer value in the context of the target process (proc 1). But you cannot dereference it in process #2.

Hans's example gives the solution, iff you need the value of ExeptionCode in process #2, then you need to dereference the pointer in proc#1 and put the value into the data you write to shared memory.