First-chance exception at 0x7c812a5b in Photoshop.exe: Microsoft C++ exception: [rethrow] at memory

Question

When I compile the Dissolve filter example code and run it while debugging it (Windows platform), I get the following error code in the Output window:
First-chance exception at 0x7c812a5b in Photoshop.exe: Microsoft C++ exception: [rethrow] at memory location 0x00000000..
Is this normal? Is it ok to have this?
This happens when I change the image to a smart object, apply the filter but hit cancel.

Answer 1

StefanE wrote:
I think the problem is, that the C program ends before the runtime has closed. So the error comes with static and dynamic linking of the dll. But not with dynamical linking if I unload the dll in my C program, wait manually (getchar) until the Labview runtime has closed and return then from the main function.
That might be a possibility. Although a DLL is always linked dynamically
I did check about the LabVIEW DLL itself. For LabVIEW 8.5 DLLs at least its DLLMain() function seems to do something that is considered rather bad by Microsoft. When it is called with DLL_PROCESS_DEATTACH it does always do a FreeLibrary() for lvrt.dll independant of the value of the third parameter "lpvReserved" to DLLMain(). This parameter is not very well documented on MSDN but there do exist some MSDN articles that warn explicitedly to do anything involved, and especially call FreeLibrary() for the DLL_PROCESS_DETACH case if this third parameter is not NULL. In that case the process that loaded the DLL is itself terminating and a lot of Windows APIs especially dealing with resource management are anything but safe to call at that time.
Also trying to unload DLLs and deallocate Windows resources in process termination is although a noble idea not really necessary since Windows will do that on behalve of the process, (and probably has done so already for some resources before some deallocation routine executes that got triggered by the FreeLibrary() call).
I would think this to be a clear case for a CAR.
Rolf Kalbermatter
Message Edited by rolfk on 01-20-2009 10:17 AM
Rolf Kalbermatter
CIT Engineering Netherlands
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