{"id":1097,"date":"2017-12-06T22:31:41","date_gmt":"2017-12-06T21:31:41","guid":{"rendered":"http:\/\/piatkosia.k4be.pl\/wordpress\/?p=1097"},"modified":"2017-12-06T22:32:27","modified_gmt":"2017-12-06T21:32:27","slug":"wladca-czasu","status":"publish","type":"post","link":"https:\/\/piatkosia.k4be.pl\/wordpress\/2017\/12\/06\/wladca-czasu\/","title":{"rendered":"W\u0142adca czasu"},"content":{"rendered":"<p style=\"text-align: justify;\">Chyba wr\u00f3c\u0119 do bycia interopem. Mo\u017cna dosta\u0107 euforii (\u017ceby nie nazwa\u0107 tego inaczej) kiedy wywo\u0142uje si\u0119 w swoim kodzie czyi\u015b kod, zw\u0142aszcza, je\u017celi nie by\u0142 on dedykowany specjalnie na Twoj\u0105 platform\u0119. Kiedy wywo\u0142ujesz jak\u0105\u015b losow\u0105 dllk\u0119, napisan\u0105 w czymkolwiek pod cokolwiek\u2026 a ju\u017c najwy\u017cszym stopniem tej\u017ce euforii b\u0119dzie \u2026 wywo\u0142anie funkcji z dllki systemowej. Takiej wiecie, System32 czy co\u015b\u2026 takiej, no we\u017amy kernel32.dll. Brzmi strasznie. Zr\u00f3bmy co\u015b, od czego komp nie wybuchnie. Ustawmy mu czas.<br \/>\n<!--more--><br \/>\nTa funkcja wg msdna wygl\u0105da mniej wi\u0119cej tak:<\/p>\n<pre class=\"brush: cpp; collapse: false\">BOOL WINAPI SetSystemTime(\r\n  _In_\u00a0const SYSTEMTIME *lpSystemTime\r\n);<\/pre>\n<p style=\"text-align: justify;\">ok, czyli mamy sobie jaki\u015b wska\u017anik (referencj\u0119 te\u017c powinno \u0142ykn\u0105\u0107) na struktur\u0119 typu SYSTEMTIME i zwraca nam w og\u00f3lnej mierze boola. No tego SYSTEMTIME nie mamy, wi\u0119c musimy go sobie wystruga\u0107 samodzielnie. Klik na <a href=\"https:\/\/msdn.microsoft.com\/pl-pl\/library\/windows\/desktop\/ms724950(v=vs.85).aspx\" target=\"_blank\" rel=\"noopener\">msdn\u00a0<\/a> i mamy co\u015b ko\u0142o tego<\/p>\n<pre class=\"brush: cpp; collapse: false\">typedef struct _SYSTEMTIME {\r\nWORD wYear;\r\nWORD wMonth;\r\nWORD wDayOfWeek;\r\nWORD wDay;\r\nWORD wHour;\r\nWORD wMinute;\r\nWORD wSecond;\r\nWORD wMilliseconds;\r\n} SYSTEMTIME, *PSYSTEMTIME;\r\n<\/pre>\n<p>Tak\u017ce musimy to przet\u0142umaczy\u0107 z C na C#. Powinno wyj\u015b\u0107 co\u015b takiego<\/p>\n<pre class=\"brush: csharp; collapse: false\"> [StructLayout(LayoutKind.Sequential)] \/\/ma by\u0107 po kolei w pami\u0119ci \u2013 bez kombinowania\r\n    public struct SYSTEMTIME\r\n    {\r\n        public short wYear;\r\n        public short wMonth;\r\n        public short wDayOfWeek;\r\n        public short wDay;\r\n        public short wHour;\r\n        public short wMinute;\r\n        public short wSecond;\r\n        public short wMilliseconds;\r\n    }\r\n<\/pre>\n<p>Jedyne co nam pozostaje, to napisa\u0107 prosty mapper ze zwyk\u0142ego datetime\u2019a na t\u0105 strukturk\u0119, a potem po prostu stworzy\u0107 prosty wrapper, kt\u00f3ry si\u0119 sprowadzi do:<\/p>\n<pre class=\"brush: csharp; collapse: false\">[DllImport(\"kernel32.dll\", SetLastError = true)]\r\n        public static extern bool SetSystemTime(ref SYSTEMTIME st);\r\n\r\n\/\/i wywo\u0142anie ograniczy si\u0119 do \r\n\/\/MojWrapper.SetSystemTime(ref st); \r\n<\/pre>\n<p>W ten spos\u00f3b mo\u017cna si\u0119 bawi\u0107 z dowolnymi funkcjami do woli.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Chyba wr\u00f3c\u0119 do bycia interopem. Mo\u017cna dosta\u0107 euforii (\u017ceby nie nazwa\u0107 tego inaczej) kiedy wywo\u0142uje si\u0119 w swoim kodzie czyi\u015b kod, zw\u0142aszcza, je\u017celi nie by\u0142<\/p>\n<div class=\"more-link-wrapper\"><a class=\"more-link\" href=\"https:\/\/piatkosia.k4be.pl\/wordpress\/2017\/12\/06\/wladca-czasu\/\">Lecim dalej<span class=\"screen-reader-text\">W\u0142adca czasu<\/span> <i class=\"fas fa-angle-right\"><\/i><\/a><\/div>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[83,50,180],"tags":[211,279,280,278,281],"class_list":["post-1097","post","type-post","status-publish","format-standard","hentry","category-c_sharp","category-c","category-libs","tag-c","tag-czas","tag-dllki","tag-interop","tag-system","entry"],"_links":{"self":[{"href":"https:\/\/piatkosia.k4be.pl\/wordpress\/wp-json\/wp\/v2\/posts\/1097","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/piatkosia.k4be.pl\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/piatkosia.k4be.pl\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/piatkosia.k4be.pl\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/piatkosia.k4be.pl\/wordpress\/wp-json\/wp\/v2\/comments?post=1097"}],"version-history":[{"count":2,"href":"https:\/\/piatkosia.k4be.pl\/wordpress\/wp-json\/wp\/v2\/posts\/1097\/revisions"}],"predecessor-version":[{"id":1099,"href":"https:\/\/piatkosia.k4be.pl\/wordpress\/wp-json\/wp\/v2\/posts\/1097\/revisions\/1099"}],"wp:attachment":[{"href":"https:\/\/piatkosia.k4be.pl\/wordpress\/wp-json\/wp\/v2\/media?parent=1097"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/piatkosia.k4be.pl\/wordpress\/wp-json\/wp\/v2\/categories?post=1097"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/piatkosia.k4be.pl\/wordpress\/wp-json\/wp\/v2\/tags?post=1097"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}