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POHow to update attributes in an XML file with InstallScript
 

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  1. POHow to update attributes in an XML file with InstallScript
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    <p><strong>Question:</strong></p> <p>I am struggling trying to figure out how to update some attributes in an XML file using InstallScript. I would like to use proper XML parsing functions, but I can't find anything that suggests this version of InstallScript is capable of it. How can I do this? Should I just attempt falling back on a combination of FileInsertLine and FileGrep? Is there a library I'm missing?</p> <p><strong>Background:</strong></p> <p><strong>What software versions?</strong><br> I am using InstallShield 11 on Windows Server 2003 R2.</p> <p><strong>Why am I not just using the existing 'XML File Changes' feature?</strong><br> Because I am doing an upgrade and running into <a href="http://installjournal.blogspot.com/2009/11/issue-in-minor-upgrade-files-not-copied.html" rel="nofollow">this bug</a>. It affects the XML File Change feature because it is tied to a Component (well, that's my guess). I spent too long trying the official workaround, but couldn't coax it to work. I eventually found out it was much easier and more reliable to copy the files over using InstallScript + a single line batch file. It feels a bit hacky, but it is something that actually works.</p> <p>Now I am trying to figure out the easiest and simplest-to-figure-out-years-later way to replicate the effects of the 'XML File Changes' feature in InstallScript.</p> <p>Please let me know if you need <strong>any</strong> more information, I will be glad to provide it.</p> <p><strong>EDIT:</strong> </p> <p>I ended up going with the InstallScript way to do it after all - it has tended to be the way that everything else in this installer project was implemented, and it looked (and turned out to be) pretty quick to do. I started out with the code <a href="http://community.flexerasoftware.com/showpost.php?p=415221&amp;postcount=8" rel="nofollow">shown by TheTraveler</a> in that thread and modified it to suit my needs. </p> <p>Here is the code: </p> <pre><code>prototype UpdateWebConfigAttributes(); prototype ReplaceValueOf(OBJECT, STRING, STRING); function UpdateWebConfigAttributes() OBJECT oDoc, oNode; NUMBER i; STRING sWebConfigFilePath; BOOL successfulLoad; begin sWebConfigFilePath = "Path\\To\\Web.config"; if Is(FILE_EXISTS, sWebConfigFilePath) = FALSE then MessageBox("Could not find Web.config file.", 0); endif; // get values from public properties set oDoc = CreateObject("Msxml2.DOMDocument.4.0"); if !IsObject(oDoc) then MessageBox("Could not create XML Document", 0); return -1; endif; oDoc.async = FALSE; oDoc.setProperty("SelectionLanguage", "XPath"); successfulLoad = oDoc.load(sWebConfigFilePath); if !successfulLoad then MessageBox("Could not load Web.config as an xml file", SEVERE); return -1; endif; ReplaceValueOf(oDoc, "//add[@key=\"ConnectionDriver\"]", CONNECT_DRIVER); ReplaceValueOf(oDoc, "//add[@key=\"ConnectionType\"]", CONNECT_TYPE); ReplaceValueOf(oDoc, "//add[@key=\"ConnectionString\"]", CONNECT_STRING_WEBCONFIG); ReplaceValueOf(oDoc, "//add[@key=\"ShowConnection\"]", "False"); oDoc.save(sWebConfigFilePath); set oDoc = NOTHING; end; function ReplaceValueOf(oDoc, xPath, valueToPutIn) OBJECT oNode; begin set oNode = oDoc.selectNodes(xPath)(0); try oNode.attributes.getNamedItem("value").value = valueToPutIn; catch MessageBox("Could not set '" + xPath + "' with '" + valueToPutIn + "'", SEVERE); endcatch; end; </code></pre>
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