{"id":199,"date":"2026-06-07T23:34:38","date_gmt":"2026-06-07T21:34:38","guid":{"rendered":"https:\/\/it2508.sspu-opava.eu\/?p=199"},"modified":"2026-06-15T19:14:06","modified_gmt":"2026-06-15T17:14:06","slug":"prace-s-vstupy-a-vystupy","status":"publish","type":"post","link":"https:\/\/it2508.sspu-opava.eu\/?p=199","title":{"rendered":"Pr\u00e1ce s vstupy a v\u00fdstupy"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"199\" class=\"elementor elementor-199\">\n\t\t\t\t<div class=\"elementor-element elementor-element-9a5bbdb e-flex e-con-boxed e-con e-parent\" data-id=\"9a5bbdb\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-5550bd0 elementor-widget elementor-widget-heading\" data-id=\"5550bd0\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">\u010c\u00e1st 1: Vytvo\u0159en\u00ed souboru a z\u00e1pis dat<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b314f4e elementor-widget elementor-widget-text-editor\" data-id=\"b314f4e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Poj\u010fme vytvo\u0159it nov\u00fd soubor a zapsat do n\u011bj textov\u00fd \u0159et\u011bzec.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b64f5b5 elementor-widget elementor-widget-text-editor\" data-id=\"b64f5b5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p data-path-to-node=\"6\">Pou\u017eijeme funkci <code data-path-to-node=\"6\" data-index-in-node=\"17\">open()<\/code>. Ta vy\u017eaduje n\u00e1zev souboru a p\u0159\u00edznaky (flags).<\/p><ul data-path-to-node=\"7\"><li><p data-path-to-node=\"7,0,0\"><code data-path-to-node=\"7,0,0\" data-index-in-node=\"0\">O_WRONLY<\/code> \u0159\u00edk\u00e1, \u017ee chceme do souboru pouze zapisovat.<\/p><\/li><li><p data-path-to-node=\"7,1,0\"><code data-path-to-node=\"7,1,0\" data-index-in-node=\"0\">O_CREAT<\/code> zajist\u00ed, \u017ee pokud soubor neexistuje, syst\u00e9m ho vytvo\u0159\u00ed.<\/p><\/li><li><p data-path-to-node=\"7,2,0\"><code data-path-to-node=\"7,2,0\" data-index-in-node=\"0\">O_TRUNC<\/code> vyma\u017ee obsah souboru, pokud u\u017e existoval, abychom za\u010d\u00ednali s \u010dist\u00fdm \u0161t\u00edtem.<\/p><\/li><\/ul><p data-path-to-node=\"8\">P\u0159i vytv\u00e1\u0159en\u00ed mus\u00edme tak\u00e9 specifikovat v\u00fdchoz\u00ed pr\u00e1va (nap\u0159. <code data-path-to-node=\"8\" data-index-in-node=\"60\">0644<\/code> znamen\u00e1, \u017ee vlastn\u00edk m\u016f\u017ee \u010d\u00edst i zapisovat, ostatn\u00ed jen \u010d\u00edst). Pro samotn\u00fd z\u00e1pis pou\u017eijeme funkci <code data-path-to-node=\"8\" data-index-in-node=\"163\">write()<\/code>. Nakonec soubor zav\u0159eme pomoc\u00ed <code data-path-to-node=\"8\" data-index-in-node=\"202\">close()<\/code>.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-55ba8cb elementor-widget elementor-widget-eael-code-snippet\" data-id=\"55ba8cb\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"eael-code-snippet.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t      <div class=\"eael-code-snippet-wrapper theme-dark view-mode-default\" data-language=\"cpp\" data-copy-button=\"1\" data-snippet-id=\"eael-code-snippet-55ba8cb\" id=\"eael-code-snippet-55ba8cb\" >\n      \n         <div class=\"eael-code-snippet-content\">\n                        <pre class=\"eael-code-snippet-code language-cpp\"><code>#include &lt;stdio.h&gt;\n#include &lt;fcntl.h&gt;\n#include &lt;unistd.h&gt;\n#include &lt;string.h&gt;\n\nint main() {\n    const char *filename = &quot;tutorial_soubor.txt&quot;;\n    const char *text = &quot;Ahoj, toto jsou binarni data ulozena v Linuxu.\\n&quot;;\n\n    \/\/ 1. Otev\u0159en\u00ed\/Vytvo\u0159en\u00ed souboru\n    \/\/ Pr\u00e1va 0644: Vlastn\u00edk (\u010dten\u00ed+z\u00e1pis), Skupina (\u010dten\u00ed), Ostatn\u00ed (\u010dten\u00ed)\n    int fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0644);\n    \n    if (fd == -1) {\n        perror(&quot;Chyba p\u0159i otev\u00edr\u00e1n\u00ed souboru&quot;);\n        return 1;\n    }\n    printf(&quot;Soubor &#039;%s&#039; byl \u00fasp\u011b\u0161n\u011b vytvo\u0159en.\\n&quot;, filename);\n\n    \/\/ 2. Z\u00e1pis dat do souboru\n    ssize_t bytes_written = write(fd, text, strlen(text));\n    if (bytes_written == -1) {\n        perror(&quot;Chyba p\u0159i z\u00e1pisu&quot;);\n        close(fd);\n        return 1;\n    }\n    printf(&quot;Zaps\u00e1no %ld bajt\u016f.\\n&quot;, bytes_written);\n\n    \/\/ 3. Zav\u0159en\u00ed souboru\n    close(fd);\n    return 0;\n}<\/code><\/pre>\n                     <\/div>\n      <\/div>\n      \t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d53409a elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"d53409a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"divider.default\">\n\t\t\t\t\t\t\t<div class=\"elementor-divider\">\n\t\t\t<span class=\"elementor-divider-separator\">\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-698a8e7 e-flex e-con-boxed e-con e-parent\" data-id=\"698a8e7\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-cfef48a elementor-widget elementor-widget-text-editor\" data-id=\"cfef48a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<h3 data-path-to-node=\"17\">Co jsme se nau\u010dili?<\/h3><ol start=\"1\" data-path-to-node=\"18\"><li><p data-path-to-node=\"18,2,0\">Jak otev\u0159\u00edt soubor<\/p><p data-path-to-node=\"18,0,0\">\u00a0<\/p><\/li><li>Jak zapsat data do souboru<\/li><\/ol>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>\u010c\u00e1st 1: Vytvo\u0159en\u00ed souboru a z\u00e1pis dat Poj\u010fme vytvo\u0159it nov\u00fd soubor a zapsat do n\u011bj textov\u00fd \u0159et\u011bzec. Pou\u017eijeme funkci open(). Ta vy\u017eaduje n\u00e1zev souboru a p\u0159\u00edznaky (flags). O_WRONLY \u0159\u00edk\u00e1, \u017ee chceme do souboru pouze zapisovat. O_CREAT zajist\u00ed, \u017ee pokud soubor neexistuje, syst\u00e9m ho vytvo\u0159\u00ed. O_TRUNC vyma\u017ee obsah souboru, pokud u\u017e existoval, abychom za\u010d\u00ednali s \u010dist\u00fdm [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":266,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[],"class_list":["post-199","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-priklady"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Pr\u00e1ce s vstupy a v\u00fdstupy - Syst\u00e9mov\u00e9 programov\u00e1n\u00ed pro blbe\u010dky<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/it2508.sspu-opava.eu\/?p=199\" \/>\n<meta property=\"og:locale\" content=\"cs_CZ\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Pr\u00e1ce s vstupy a v\u00fdstupy - Syst\u00e9mov\u00e9 programov\u00e1n\u00ed pro blbe\u010dky\" \/>\n<meta property=\"og:description\" content=\"\u010c\u00e1st 1: Vytvo\u0159en\u00ed souboru a z\u00e1pis dat Poj\u010fme vytvo\u0159it nov\u00fd soubor a zapsat do n\u011bj textov\u00fd \u0159et\u011bzec. Pou\u017eijeme funkci open(). Ta vy\u017eaduje n\u00e1zev souboru a p\u0159\u00edznaky (flags). O_WRONLY \u0159\u00edk\u00e1, \u017ee chceme do souboru pouze zapisovat. O_CREAT zajist\u00ed, \u017ee pokud soubor neexistuje, syst\u00e9m ho vytvo\u0159\u00ed. 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Syst\u00e9mov\u00e9 programov\u00e1n\u00ed pro blbe\u010dky","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/it2508.sspu-opava.eu\/?p=199","og_locale":"cs_CZ","og_type":"article","og_title":"Pr\u00e1ce s vstupy a v\u00fdstupy - Syst\u00e9mov\u00e9 programov\u00e1n\u00ed pro blbe\u010dky","og_description":"\u010c\u00e1st 1: Vytvo\u0159en\u00ed souboru a z\u00e1pis dat Poj\u010fme vytvo\u0159it nov\u00fd soubor a zapsat do n\u011bj textov\u00fd \u0159et\u011bzec. Pou\u017eijeme funkci open(). Ta vy\u017eaduje n\u00e1zev souboru a p\u0159\u00edznaky (flags). O_WRONLY \u0159\u00edk\u00e1, \u017ee chceme do souboru pouze zapisovat. O_CREAT zajist\u00ed, \u017ee pokud soubor neexistuje, syst\u00e9m ho vytvo\u0159\u00ed. 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