Slight correction (forgot first parameter for GetVariableValue). Corrected inline.
-----Original Message----- From: Blair [mailto:os...@live.com] Sent: Tuesday, February 16, 2010 10:36 PM To: 'General discussion for Windows Installer XML toolset.' Subject: RE: [WiX-users] Is it possible to dynamically access a ?define variable in WiX You are exactly on the right track. Your extension will implement a prefix of "Blah", will respond to a function named "GetValue", and that function will return the value from Core.GetVariableValue("var", args[0]); Before your extension is called, "$(lang)_cost" will be replaced in the preprocessor by each successive value of "chs_cost", "cht_cost", etc. Your extension calls into the PreprocessorCore class asking for the value of those variables and those become the return value from your function. So, your preprocessor class would contain (this is just part of your implementation, treat as sample code): private string[] prefixes = { "Blah" }; public override string[] Prefixes { get { return prefixes; } } public override string EvaluateFunction(string prefix, string function, string[] args) { // Perform validation, etc switch (prefix) { case "Blah": switch (function) { case "GetValue": // you may consider checking for missing values before returning here return core.GetVariableValue(null, "var", args[0]); } } // you may consider different error handling here. return null; } The rest of the needed code is broilerplate WiX Extension code which is documented elsewhere (blogs, this list, the chm). -----Original Message----- From: jnewton [mailto:jonathan.new...@ni.com] Sent: Tuesday, February 16, 2010 5:53 PM To: wix-users@lists.sourceforge.net Subject: Re: [WiX-users] Is it possible to dynamically access a ?define variable in WiX Maybe I don't understand the GetVariableValue method, but it seems to need a prefix and a variable name. What if I want the normal variables with the prefix of "var" like $(var.myVariableName)? I didn't see any options to get the variables you defined in the wix source. Like I was thinking of something like: <?define cost = 55 /> <Property Id="TEST" Value="$(Blah.GetValue(cost))" /> In this case, the prefix is var. I am envisioning something like: <?define chs_cost = 55" /> <?foreach lang in chs;cht..?> <Property Id="TEST" Value="$(Blah.GetValue($(lang)_cost))" /> <?endforeach> This would end up pass values like chs_cost and cht_cost to the extension. Then I would like to say GetVariableValue("var", "chs_cost") and it would give me a value of 55. Make sense? I'm just not seeing how I would implement this. Am I on the write track? If I want to access already defined variables that have a prefix of var, what do I need to call? Thanks -- View this message in context: http://n2.nabble.com/Is-it-possible-to-dynamically-access-a-define-variable- in-WiX-tp4582645p4583797.html Sent from the wix-users mailing list archive at Nabble.com. ---------------------------------------------------------------------------- -- SOLARIS 10 is the OS for Data Centers - provides features such as DTrace, Predictive Self Healing and Award Winning ZFS. Get Solaris 10 NOW http://p.sf.net/sfu/solaris-dev2dev _______________________________________________ WiX-users mailing list WiX-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/wix-users ------------------------------------------------------------------------------ SOLARIS 10 is the OS for Data Centers - provides features such as DTrace, Predictive Self Healing and Award Winning ZFS. Get Solaris 10 NOW http://p.sf.net/sfu/solaris-dev2dev _______________________________________________ WiX-users mailing list WiX-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/wix-users
