{"id":6483,"date":"2012-09-27T07:00:00","date_gmt":"2012-09-27T07:00:00","guid":{"rendered":"https:\/\/blogs.msdn.microsoft.com\/oldnewthing\/2012\/09\/27\/why-arent-environment-variables-being-expanded-in-my-rgs-file\/"},"modified":"2012-09-27T07:00:00","modified_gmt":"2012-09-27T07:00:00","slug":"why-arent-environment-variables-being-expanded-in-my-rgs-file","status":"publish","type":"post","link":"https:\/\/devblogs.microsoft.com\/oldnewthing\/20120927-00\/?p=6483","title":{"rendered":"Why aren't environment variables being expanded in my RGS file?"},"content":{"rendered":"

A customer was having trouble with their RGS file.\n<\/p>\n

\n

\nI want to include the below line in a .rgs file:\n<\/p>\n

\nval HandlerPath = s '%windir%\\system32\\awesome.dll'.\n<\/pre>\n
\nWhen I do this, registering of the dll fails with 80002009. Any help?\nIf I change it to\n<\/p>\n
\nval HandlerPath = s 'C:\\windows\\system32\\awesome.dll'.\n<\/pre>\n
\nthen the registration succeeds (but of course now contains\na hard-coded path).\n<\/p>\n<\/blockquote>\n
\nA common problem people have when asking a question is assuming\nthat the person reading your question has knowledge that is a\nstrict superset of what you know.\nAs a result, people omit details like\nthe answer to the question\n“How did you register your RGS file?”\n<\/p>\n
\nIf all else fails read the documentation\n(which happens to be the #1 hit for “rgs file”, or at least was\nat the time of this writing).\nAnd the documentation explains\n\nhow the %<\/code> works<\/a>.\nAnd it’s not for environment variable expansion.\n<\/p>\n
\nJust because you stick something between percent signs\ndoesn’t mean that the magical percent sign fairies are going\nto swoop in and perform environment variable expansion.\n\nWishful thinking does not cause features to spring into existence<\/a>.\n<\/p>\n
\nAs the documentation says,\nyou need to use the\n_ATL_REGMAP_ENTRY<\/code> macro to\ncreate the mapping for replacement variables.\n<\/p>\n
\nThis type of question reflects a certain mentality which is\n\ncute when kids do it<\/a>,\nbut frustrating when demonstrated by programmers,\nnamely, that features exist\nmerely because you expect them to<\/i>,\nrather than because there’s any documentation that\nsuggests that they exist.<\/p>\n","protected":false},"excerpt":{"rendered":"
A customer was having trouble with their RGS file. I want to include the below line in a .rgs file: val HandlerPath = s ‘%windir%\\system32\\awesome.dll’. When I do this, registering of the dll fails with 80002009. Any help? If I change it to val HandlerPath = s ‘C:\\windows\\system32\\awesome.dll’. then the registration succeeds (but of course […]<\/p>\n","protected":false},"author":1069,"featured_media":111744,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[25],"class_list":["post-6483","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-oldnewthing","tag-code"],"acf":[],"blog_post_summary":"
A customer was having trouble with their RGS file. I want to include the below line in a .rgs file: val HandlerPath = s ‘%windir%\\system32\\awesome.dll’. When I do this, registering of the dll fails with 80002009. Any help? If I change it to val HandlerPath = s ‘C:\\windows\\system32\\awesome.dll’. then the registration succeeds (but of course […]<\/p>\n","_links":{"self":[{"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/posts\/6483","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/users\/1069"}],"replies":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/comments?post=6483"}],"version-history":[{"count":0,"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/posts\/6483\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/media\/111744"}],"wp:attachment":[{"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/media?parent=6483"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/categories?post=6483"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/tags?post=6483"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}