The bafunctions.dll is ideal for the scenario you described. There is more info on how to use a bafunctions.dll at here <https://wixextba.codeplex.com/> . Prior to wix 3.8 you needed to use the download from that site to modify the behavior of wix 3.7. But now you just need to create a win32 DLL project and add the sample code to that project.
1) Define an overridable Variable element in your BA to be used in your XxxPackage/@InstallCondition to control if your optional package is installed. (You can get this working on the command line first before adding the BAFunctions.dll.) 2) Create a Win32 DLL project, and copy the sample code from here <https://github.com/wixtoolset/wix3/tree/ecfe55eb0654758427dc196f1d98ef4cb3d16f29/src/burn/Samples/bafunctions> (or from the folder tree to the source zip download). 3) In WixBootstrapperBAFunction.cpp (probably in OnDetectComplete), you would implement the code to detect the prereq, and then set the Variable (defined in the Bundle). For this situation I prefer to use a Numeric variable. // based on some test, do not install 'Prereq hr = m_pEngine->SetVariableNumeric(L"Prereq", 0); BalExitOnFailure(hr, "Failed to set variable."); I have done this and it works very well. You could also implement code in the Plan handlers rather than using a engine Variable in the InstallCondition, but I did not do that when I was using the BAFunctions.dll. (I since moved to a mba.) -- View this message in context: http://windows-installer-xml-wix-toolset.687559.n2.nabble.com/Calling-C-API-in-WiX-Standard-Bootstrapper-Application-tp7599620p7599632.html Sent from the wix-users mailing list archive at Nabble.com. ------------------------------------------------------------------------------ Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ _______________________________________________ WiX-users mailing list WiX-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/wix-users
