\nBut how do you detect programmatically from your 64-bit process\nwhether you are running on 64-bit Windows? Easy.\n<\/p>\n
\nBOOL Is64BitProcessRunningOn64BitWindows()\n{\n return TRUE;\n}\n<\/pre>\n\nThe fact that your 64-bit program is running at all\nmeans that you are running on 64-bit Windows!\nIf it were a 32-bit machine, your program wouldn’t be\nable to run.\n<\/p>\n
\nIt’s like asking the question, “Is the power on?”\nIf there were no power, your program wouldn’t be able to ask the question.\n<\/p>\n
\nOf course, if you want a single source code base that can be\ncompiled both as a 32-bit program and as a 64-bit program,\nyou have a tiny amount of work to do.\n<\/p>\n
\nBOOL Is64BitWindows()\n{\n#if defined(_WIN64)\n return TRUE; \/\/ 64-bit programs run only on Win64\n#elif defined(_WIN32)\n \/\/ 32-bit programs run on both 32-bit and 64-bit Windows\n \/\/ so must sniff\n BOOL f64 = FALSE;\n return IsWow64Process(GetCurrentProcess(), &f64) && f64;\n#else\n return FALSE; \/\/ Win64 does not support Win16\n#endif\n}\n<\/pre>\n\nI threw in a branch for 16-bit programs if you’re crazy enough\nto be still writing 16-bit Windows programs.<\/p>\n","protected":false},"excerpt":{"rendered":"
To detect programmatically whether your 32-bit program is running on 64-bit Windows, you can use the IsWow64Process function. Do not do as some people do and hard-code the list of 64-bit processors. You’d think that after the hard-coded list of 64-bit processors changed the first time (when x64 was added to ia64), people would have […]<\/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-36553","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-oldnewthing","tag-code"],"acf":[],"blog_post_summary":"
To detect programmatically whether your 32-bit program is running on 64-bit Windows, you can use the IsWow64Process function. Do not do as some people do and hard-code the list of 64-bit processors. You’d think that after the hard-coded list of 64-bit processors changed the first time (when x64 was added to ia64), people would have […]<\/p>\n","_links":{"self":[{"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/posts\/36553","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=36553"}],"version-history":[{"count":0,"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/posts\/36553\/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=36553"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/categories?post=36553"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/tags?post=36553"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}