{"id":26663,"date":"2007-05-29T10:00:00","date_gmt":"2007-05-29T10:00:00","guid":{"rendered":"https:\/\/blogs.msdn.microsoft.com\/oldnewthing\/2007\/05\/29\/psychic-debugging-why-does-formatmessage-say-the-resource-couldnt-be-found\/"},"modified":"2007-05-29T10:00:00","modified_gmt":"2007-05-29T10:00:00","slug":"psychic-debugging-why-does-formatmessage-say-the-resource-couldnt-be-found","status":"publish","type":"post","link":"https:\/\/devblogs.microsoft.com\/oldnewthing\/20070529-00\/?p=26663","title":{"rendered":"Psychic debugging: Why does FormatMessage say the resource couldn't be found?"},"content":{"rendered":"

\nSolving this next problem should be a snap with your\nnascent psychic powers:\n<\/p>\n

\nI’m trying use FormatMessage<\/code>\nto load a resource string with one insertion in it,\nand this doesn’t work for some reason.\nThe string is\n“Blah blah blah %1. Blah blah blah.”\nThe call to FormatMessage<\/code> fails,\nand GetLastError()<\/code> returns\nERROR_RESOURCE_TYPE_NOT_FOUND<\/code>.\nWhat am I doing wrong?<\/p>\n

\nLPTSTR pszInsertion = TEXT(\"Sample\");\nLPTSTR pszResult;\nFormatMessage(\n        FORMAT_MESSAGE_ALLOCATE_BUFFER |\n        FORMAT_MESSAGE_FROM_HMODULE |\n        FORMAT_MESSAGE_ARGUMENT_ARRAY,\n        \/\/I also tried an instance handle and NULL.\n        GetModuleHandle(NULL),\n        IDS_MY_CUSTOM_MESSAGE,\n        MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), \/\/ default language\n        (LPTSTR) &pszResult,\n        0,\n        (va_list*) &pszInsertion);\n<\/pre>\n<\/blockquote>\n
\nHint: Take a closer look at the parameter\nIDS_MY_CUSTOM_MESSAGE<\/code>.\n<\/p>\n
\nHint 2: What does “IDS_<\/code>” tell you?\n<\/p>\n
\nResource identifiers that begin with “IDS_<\/code>”\nare typically string resource identifiers, not message resource\nidentifiers.\nThere is no strong consensus on the naming convention for\nmessage resource identifiers,\nalthough I’ve seen “MSG_<\/code>“.\nPart of the reason why there is no strong consensus on the naming\nconvention for message resource identifiers is that almost nobody\nuses message resources!\nI don’t understand why they were added to Win32, since there\nwas already a way of embedding strings in resources,\nnamely, string resources.\n<\/p>\n
\nThat’s why you’re getting ERROR_RESOURCE_TYPE_NOT_FOUND<\/code>.\nThere is no message resource in your module.\nIf you’re not going to use a message resource, you’ll have to\nuse the FORMAT_MESSAGE_FROM_STRING<\/code> flag and\npass the format string explicitly.\n<\/p>\n
\nDWORD_PTR rgdwInsertions[1] = { (DWORD_PTR)TEXT(\"Sample\") };\nTCHAR szFormat[256];\nLoadString(hInstance, IDS_MY_CUSTOM_MESSAGE, szFormat, 256);\nLPTSTR pszResult;\nFormatMessage(\n        FORMAT_MESSAGE_ALLOCATE_BUFFER |\n        FORMAT_MESSAGE_FROM_STRING |\n        FORMAT_MESSAGE_ARGUMENT_ARRAY,\n        szFormat,\n        0,\n        0,\n        (LPTSTR) &pszResult,\n        0,\n        (va_list*) &rgdwInsertions);\n<\/pre>\n
\nI also made a slight change to the final parameter.\nWhen you use FORMAT_MESSAGE_ARGUMENT_ARRAY<\/code>,\nthe last parameter must be an array of DWORD_PTR<\/code>s.\n(The parameter must be cast to va_list*<\/code> to keep\nthe compiler happy.)\nIt so happens that the original code got away with this mistake\nsince sizeof(DWORD_PTR) == sizeof(LPTSTR)<\/code> and they\nboth have the same alignment requirements.\nOn the other hand, if the insertion were a DWORD<\/code>,\npassing (va_list*)&dwValue<\/code> is definitely wrong\nand can crash if you’re sufficiently unlucky.\n(Determining the conditions under which your luck runs out\nis left as an exercise.)<\/p>\n","protected":false},"excerpt":{"rendered":"
Solving this next problem should be a snap with your nascent psychic powers: I’m trying use FormatMessage to load a resource string with one insertion in it, and this doesn’t work for some reason. The string is “Blah blah blah %1. Blah blah blah.” The call to FormatMessage fails, and GetLastError() returns ERROR_RESOURCE_TYPE_NOT_FOUND. What am […]<\/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-26663","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-oldnewthing","tag-code"],"acf":[],"blog_post_summary":"
Solving this next problem should be a snap with your nascent psychic powers: I’m trying use FormatMessage to load a resource string with one insertion in it, and this doesn’t work for some reason. The string is “Blah blah blah %1. Blah blah blah.” The call to FormatMessage fails, and GetLastError() returns ERROR_RESOURCE_TYPE_NOT_FOUND. What am […]<\/p>\n","_links":{"self":[{"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/posts\/26663","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=26663"}],"version-history":[{"count":0,"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/posts\/26663\/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=26663"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/categories?post=26663"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/tags?post=26663"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}