DLL / Debugging issues
- Posted by Travis_Beaty Sep 14, 2014
- 1248 views
Hello all. I've got a few questions here because I'm stumped.
I'm working on a project which is basically a "wrapper," to allow me to use a CPP library in Euphoria. On the CPP side, I'm creating liaison functions using extern "C". define_c_func() and define_c_proc() appear to see them fine. However, on one particular function which involves the Qt method QWidget::show(), I'm getting a segfault as soon as it is executed.
The ex.err is pointing to the c_proc() call. I've checked that I have a good routine id, and that the C_ argument parameters I used in define_c_proc() were correct. I've also checked that Euphoria atoms holding pointer values are actually holding valid values. So, this made me think it was a problem in the CPP code.
Unfortunately, trying to debug CPP from a running eui sessions just didn't work. So, I built a test run by creating an executable (in CPP) using the source code for the shared library. In this test executable, I only called the C functions that my Euphoria code is using. The code worked correctly. So, now I'm thinking some interaction between the C code and Euphoria that just isn't working. Looking around online, I couldn't find much to go on with a crash in QWidget::show(), other than issues with threading. Does Euphoria multi-thread stuff by default? And if so, can I guarantee that these calls are all happening on the same thread? And any pointers on attaching a debugger onto a Euphoria interpreter run?
Any ideas would be appreciated. Thanks!
P.S. The two pluses in C plus plus was making my formatting all kinds of wonky.
