If using WixStdBA, a BAFunctions.dll could be used. A sample project is in
the wix source (src\burn\Samples\bafunctions). Add a C# library project to
your solution and copy the sample files from the bafunctions sample , and
get it compiling. Then in WixBootstrapperBAFunction::OnDetectComplete
implement something like like the code at Neal's site:
https://wixextba.codeplex.com/SourceControl/latest#bafunctions/WixBootstrapperBAFunction.cpp
BalGetStringVariable(L"SomeVar", &sczValue);
BalExitOnFailure(hr, "Failed to get variable.");
...do something to formulate the string someString
hr = m_pEngine->SetVariableString(L"ExeParameters", someString);
BalExitOnFailure(hr, "Failed to set variable.");
Also define the Burn Variable/@Overridable='yes' so that the BA can make
these changes.
Rob's advice to do a custom BA is the better choice in the long run.
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