The current release of IPWI (2.0) provides a feature to ease your work to debug a C/C++ based user custom DLL function. This is an undocumented feature. You need to follow these steps to use it:
Now you are ready for the debug session, start your package (Either click "run" button or "test" button from IPWI IDE). Before calling your DLL function, setup will prompt a message box asking whether you want to debug the given function. Say no if you are not interested. If you say yes, your debugger will be launched and your installation will break inside the debugger. (You may get another message box saying a breakpoint is reached, depending on your debugger) You will find your debugger breaks at the following assembly code (It may look a little different on your machine)
1001748E int 3
1001748F call dword ptr [ebp-0Ch]
The second line is the call to your function. Make three single steps until you are inside your own function. Most probably you will see a mix of C/C++ code and assembly code. Do not be scared, just turn off the assembly mode (With Visual C++, Press Ctrl+F11) Now you should see the debugger stops at the first line of your code. You can continue your session from there.
This works for custom actions in both UI and Execute sequences.
Remove the registry key mentioned above to disable this feature.
Currently, this has been tested on Windows 98 and Windows NT/2000 with Microsoft Visual Studio 6. It may not work on Windows 95.
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