<\/div>\n

Merhaba,<\/p>\n

C#’ta g\u00f6stericileri tam teferruatl\u0131 ele ald\u0131\u011f\u0131m\u0131z yaz\u0131 dizimize be\u015finci makalemizden “G\u00f6stericiler Aras\u0131nda T\u00fcr D\u00f6n\u00fc\u015f\u00fcmleri” ba\u015fl\u0131\u011f\u0131yla devam ediyoruz. Yaz\u0131 dizimizi takip edebilmeniz i\u00e7in bir \u00f6nceki yazm\u0131\u015f oldu\u011fumuz C#\u2019ta G\u00f6sterici(Pointer) \u2013 G\u00f6sterici Bildirimi ve G\u00f6sterici Operat\u00f6rleri \u2013 IV<\/a> ba\u015fl\u0131kl\u0131 makaleyi referans alabilir ve ilgili makale arac\u0131l\u0131\u011f\u0131yla yaz\u0131 dizimizin di\u011fer makalelerine eri\u015febilirsiniz.<\/p>\n

Evet… \u015eimdi hi\u00e7 vakit kaybetmeden esas konumuza giri\u015f yapal\u0131m.<\/p>\n

G\u00f6stericiler, basit de\u011fi\u015fkenler misali t\u00fcr d\u00f6n\u00fc\u015f\u00fcmlerini destekleyen bir yap\u0131ya sahiptirler.
\n\u00d6rnek olarak a\u015fa\u011f\u0131daki kod bloklar\u0131n\u0131 inceleyiniz.<\/p>\n

\r\n--- \u00d6rnek 1 ---\r\n            unsafe\r\n            {\r\n                int a = 123;\r\n                int* apointer = &a;\r\n\r\n                char c = 'h';\r\n                char* cpointer = &c;\r\n                Console.WriteLine(*cpointer);\r\n\r\n                cpointer = (char*)apointer;\r\n                Console.WriteLine(*cpointer);\r\n            }\r\n<\/pre>\n<\/a><\/p>\n
\r\n--- \u00d6rnek 2 ---\r\n            unsafe\r\n            {\r\n                int a = 123;\r\n                int* apointer = &a;\r\n                Console.WriteLine(*apointer);\r\n\r\n                char c = 'h';\r\n                char* cpointer = &c;\r\n\r\n                apointer = (int*)cpointer;\r\n                Console.WriteLine(*apointer);\r\n            }\r\n<\/pre>\n<\/a><\/p>\n
G\u00f6rd\u00fc\u011f\u00fcn\u00fcz gibi iki \u00f6rnektede “int*” ve “char*” t\u00fcr\u00fcnden i\u015faret\u00e7iler aras\u0131nda bir d\u00f6n\u00fc\u015f\u00fcm ger\u00e7ekle\u015ftirilmi\u015ftir. Dikkat ederseniz g\u00f6stericiler aras\u0131nda d\u00f6n\u00fc\u015f\u00fcm a\u00e7\u0131k\u00e7a belirtilmeli, yani bilin\u00e7li t\u00fcr d\u00f6n\u00fc\u015f\u00fcm\u00fc ger\u00e7ekle\u015ftirilmelidir.<\/p>\n
E\u011fer ki a\u015fa\u011f\u0131daki gibi g\u00f6stericiler aras\u0131nda bilin\u00e7siz olarak t\u00fcr d\u00f6n\u00fc\u015f\u00fcm\u00fc yapmaya \u00e7al\u0131\u015f\u0131rsan\u0131z derleme zaman\u0131nda hata alacaks\u0131n\u0131z.
\n<\/a><\/p>\n
G\u00f6stericiler aras\u0131nda yap\u0131lan t\u00fcr d\u00f6n\u00fc\u015f\u00fcm\u00fcnde g\u00f6stericinin say\u0131sal de\u011feri de\u011fi\u015fmez. De\u011fi\u015fen \u015fey g\u00f6stericinin t\u00fcr\u00fcd\u00fcr.
\nPeki bu g\u00f6stericinin say\u0131sal de\u011feri nedir?<\/em><\/strong>
\nG\u00f6stericilerin adres bilgileridir. Bir g\u00f6sterici i\u015faretledi\u011fi de\u011fi\u015fkenin adres bilgisini tam say\u0131 \u015feklinde tutmaktad\u0131r. Bu say\u0131y\u0131 okumak i\u00e7in i\u015faret\u00e7i referans\u0131n\u0131 “int” yahut “uint” tipinden tam say\u0131 de\u011ferlerine cast etmek yeterlidir.<\/p>\n
\r\n        static void Main(string[] args)\r\n        {\r\n            unsafe\r\n            {\r\n                int a = 104;\r\n                int* apointer = &a;\r\n                Console.WriteLine($"apointer adres : {(int)apointer}");\r\n\r\n                char b = 'g';\r\n                char* bpointer = &b;\r\n                Console.WriteLine($"bpointer adres : {(uint)bpointer}");\r\n\r\n                bool c = true;\r\n                bool* cpointer = &c;\r\n                Console.WriteLine($"cpointer adres : {(uint)cpointer}");\r\n            }\r\n            Console.Read();\r\n        }\r\n<\/pre>\nYukar\u0131daki kod blo\u011funu incelerseniz e\u011fer “apointer”, “bpointer” ve “cpointer” isimli pointerlar\u0131n tuttuklar\u0131 bellek adresleri ekrana yazd\u0131r\u0131lm\u0131\u015ft\u0131r. Bu \u015fekilde projeyi derleyip \u00e7al\u0131\u015ft\u0131rd\u0131\u011f\u0131m\u0131z vakit a\u015fa\u011f\u0131daki ekran g\u00f6r\u00fcnt\u00fcs\u00fcne benzer sonu\u00e7la kar\u015f\u0131la\u015f\u0131lmaktad\u0131r.
\n<\/a>
\nProgram\u0131 her kapat\u0131p yeniden \u00e7al\u0131\u015ft\u0131rd\u0131\u011f\u0131m\u0131zda ilgili de\u011ferlerin de\u011fi\u015fmesi olduk\u00e7a do\u011fald\u0131r.<\/p>\n
Ayr\u0131ca a\u015fa\u011f\u0131daki \u00f6rnekte oldu\u011fu gibi herhangi bir g\u00f6stericinin say\u0131sal bile\u015fenine ula\u015fmak i\u00e7in pointer\u0131n ismini direkt olarak \u00e7a\u011f\u0131rmak yanl\u0131\u015f bir kullan\u0131m olacakt\u0131r.
\n<\/a>
\n\u0130lgili g\u00f6stericinin i\u015faretledi\u011fi bellek adresini elde etmek i\u00e7in bir \u00fcstteki kullan\u0131mda oldu\u011fu gibi d\u00f6n\u00fc\u015f\u00fcm\u00fcn a\u00e7\u0131k bir \u015fekilde pointer \u00fczerinde yap\u0131lmas\u0131((int)apointer ya da (uint)apointer gibi…<\/em>) gerekmektedir.<\/p>\n
E\u011fer ki d\u00f6n\u00fc\u015f\u00fcms\u00fcz t\u00fcm t\u00fcrler \u00fczerinde \u00e7al\u0131\u015fmak istiyorsak “void” anahtar s\u00f6zc\u00fc\u011f\u00fc olduk\u00e7a i\u015fimizi g\u00f6recektir. G\u00f6stericilerle ilgili \u00f6nceki makalelerimizde de\u011findi\u011fimiz “void” keyword\u00fc, pointer yap\u0131lar\u0131nda t\u00fcrden ba\u011f\u0131ms\u0131z bir i\u015faret\u00e7i ayarlamam\u0131za imkan sa\u011flamaktad\u0131r. “void” t\u00fcr\u00fcnden g\u00f6stericiler genellikle eski yaz\u0131lm\u0131\u015f API fonksiyonlar\u0131nda “void” parametre alan fonksiyonlar\u0131 programlar\u0131m\u0131z i\u00e7erisinden \u00e7a\u011f\u0131rmak i\u00e7in kullan\u0131l\u0131r.<\/p>\n
\r\n            unsafe\r\n            {\r\n                void* x;\r\n                int a = 3;\r\n                bool b = false;\r\n                char c = 'a';\r\n                double d = 1.233;\r\n                x = &a;\r\n                x = &b;\r\n                x = &c;\r\n                x = &d;\r\n\r\n                Console.WriteLine(*(double*)x);\r\n            }\r\n<\/pre>\nYukar\u0131daki \u00f6rne\u011fi incelerseniz e\u011fer “void” t\u00fcr\u00fcnden pointerlarda d\u00f6n\u00fc\u015f\u00fcm yapmadan t\u00fcm t\u00fcrleri i\u015faretleyebilirken sadece ilgili pointer\u0131n de\u011ferini okumak istedi\u011fimiz vakit i\u015faretledi\u011fi t\u00fcre \u00f6zel bir cast i\u015flemi uygulamak mecburiyetimiz vard\u0131r.<\/p>\n
Evet arkada\u015flar…
\nBu makalemizde de pointerlar ile t\u00fcr d\u00f6n\u00fc\u015f\u00fcmlerini yeterince detayland\u0131rm\u0131\u015f oldu\u011fumuza inan\u0131yorum. Bir sonraki makalede g\u00f6stericilerde aritmatik i\u015flemlere de\u011finece\u011fiz.<\/p>\n
O halde \u015fimdilik g\u00f6r\u00fc\u015fmek \u00fczere diyelim…
\n\u0130yi \u00e7al\u0131\u015fmalar…<\/p>\n","protected":false},"excerpt":{"rendered":"
Merhaba, C#’ta g\u00f6stericileri tam teferruatl\u0131 ele ald\u0131\u011f\u0131m\u0131z yaz\u0131 dizimize be\u015finci makalemizden “G\u00f6stericiler Aras\u0131nda T\u00fcr D\u00f6n\u00fc\u015f\u00fcmleri” ba\u015fl\u0131\u011f\u0131yla devam ediyoruz. Yaz\u0131 dizimizi takip edebilmeniz i\u00e7in bir \u00f6nceki yazm\u0131\u015f oldu\u011fumuz C#\u2019ta G\u00f6sterici(Pointer) \u2013 G\u00f6sterici Bildirimi ve G\u00f6sterici...<\/p>\n","protected":false},"author":1,"featured_media":3014,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12],"tags":[1782,1761,1780,1748,1781],"class_list":["post-6233","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-c-sharp-c","tag-c-pointer-tur-donusumu","tag-cta-gosterici","tag-gostericiler-arasinda-tur-donusumleri","tag-pointer","tag-pointer-tur-donusumu"],"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/posts\/6233","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/comments?post=6233"}],"version-history":[{"count":0,"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/posts\/6233\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/media\/3014"}],"wp:attachment":[{"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/media?parent=6233"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/categories?post=6233"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/tags?post=6233"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}