{"id":25091,"date":"2024-03-16T04:21:46","date_gmt":"2024-03-16T04:21:46","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-read-a-string-in-linux-by-bytes\/"},"modified":"2024-03-22T05:20:04","modified_gmt":"2024-03-22T05:20:04","slug":"how-to-read-a-string-in-linux-by-bytes","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-read-a-string-in-linux-by-bytes\/","title":{"rendered":"How to read a string in Linux by bytes?"},"content":{"rendered":"<p>In Linux, you can read strings byte by byte using the standard C library function fread.<\/p>\n<p>Here is a sample code:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;stdio.h&gt;<\/span><\/span>\r\n\r\n<span class=\"hljs-meta\">#<span class=\"hljs-keyword\">define<\/span> BUFFER_SIZE 256<\/span>\r\n\r\n<span class=\"hljs-type\">int<\/span> <span class=\"hljs-title function_\">main<\/span><span class=\"hljs-params\">()<\/span> {\r\n    FILE *file;\r\n    <span class=\"hljs-type\">char<\/span> buffer[BUFFER_SIZE];\r\n    <span class=\"hljs-type\">int<\/span> bytesRead;\r\n\r\n    <span class=\"hljs-comment\">\/\/ \u6253\u5f00\u6587\u4ef6<\/span>\r\n    file = fopen(<span class=\"hljs-string\">\"file.txt\"<\/span>, <span class=\"hljs-string\">\"rb\"<\/span>);\r\n\r\n    <span class=\"hljs-keyword\">if<\/span> (file == <span class=\"hljs-literal\">NULL<\/span>) {\r\n        <span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"\u65e0\u6cd5\u6253\u5f00\u6587\u4ef6\\n\"<\/span>);\r\n        <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">1<\/span>;\r\n    }\r\n\r\n    <span class=\"hljs-comment\">\/\/ \u8bfb\u53d6\u6587\u4ef6\u5185\u5bb9<\/span>\r\n    bytesRead = fread(buffer, <span class=\"hljs-number\">1<\/span>, BUFFER_SIZE<span class=\"hljs-number\">-1<\/span>, file);\r\n    buffer[bytesRead] = <span class=\"hljs-string\">'\\0'<\/span>; <span class=\"hljs-comment\">\/\/ \u5c06\u5b57\u7b26\u4e32\u7ed3\u5c3e\u8bbe\u7f6e\u4e3a'\\0'<\/span>\r\n\r\n    <span class=\"hljs-comment\">\/\/ \u8f93\u51fa\u8bfb\u53d6\u5230\u7684\u5b57\u7b26\u4e32<\/span>\r\n    <span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"\u8bfb\u53d6\u5230\u7684\u5185\u5bb9\uff1a%s\\n\"<\/span>, buffer);\r\n\r\n    <span class=\"hljs-comment\">\/\/ \u5173\u95ed\u6587\u4ef6<\/span>\r\n    fclose(file);\r\n\r\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">0<\/span>;\r\n}\r\n<\/code><\/pre>\n<p>This sample code opens a file named file.txt, reads bytes from the file, up to a maximum of BUFFER_SIZE-1 bytes (the last byte is used to store the string&#8217;s end \\0). The bytes read are stored in the buffer array and printed using the printf function.<\/p>\n<p> Save the sample code as read_bytes.c file, then compile and run it with the following commands:<\/p>\n<pre class=\"post-pre\"><code>gcc -o read_bytes read_bytes.c\r\n.\/read_bytes\r\n<\/code><\/pre>\n<p>This way, you can read the string byte by byte.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In Linux, you can read strings byte by byte using the standard C library function fread. Here is a sample code: #include &lt;stdio.h&gt; #define BUFFER_SIZE 256 int main() { FILE *file; char buffer[BUFFER_SIZE]; int bytesRead; \/\/ \u6253\u5f00\u6587\u4ef6 file = fopen(&#8220;file.txt&#8221;, &#8220;rb&#8221;); if (file == NULL) { printf(&#8220;\u65e0\u6cd5\u6253\u5f00\u6587\u4ef6\\n&#8221;); return 1; } \/\/ \u8bfb\u53d6\u6587\u4ef6\u5185\u5bb9 bytesRead = fread(buffer, [&hellip;]<\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-25091","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to read a string in Linux by bytes? - Blog - Silicon Cloud<\/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:\/\/www.silicloud.com\/blog\/how-to-read-a-string-in-linux-by-bytes\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to read a string in Linux by bytes?\" \/>\n<meta property=\"og:description\" content=\"In Linux, you can read strings byte by byte using the standard C library function fread. Here is a sample code: #include &lt;stdio.h&gt; #define BUFFER_SIZE 256 int main() { FILE *file; char buffer[BUFFER_SIZE]; int bytesRead; \/\/ \u6253\u5f00\u6587\u4ef6 file = fopen(&quot;file.txt&quot;, &quot;rb&quot;); if (file == NULL) { printf(&quot;\u65e0\u6cd5\u6253\u5f00\u6587\u4ef6n&quot;); return 1; } \/\/ \u8bfb\u53d6\u6587\u4ef6\u5185\u5bb9 bytesRead = fread(buffer, [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/blog\/how-to-read-a-string-in-linux-by-bytes\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/SiliCloudGlobal\/\" \/>\n<meta property=\"article:published_time\" content=\"2024-03-16T04:21:46+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-03-22T05:20:04+00:00\" \/>\n<meta name=\"author\" content=\"Liam\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@SiliCloudGlobal\" \/>\n<meta name=\"twitter:site\" content=\"@SiliCloudGlobal\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Liam\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-to-read-a-string-in-linux-by-bytes\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-to-read-a-string-in-linux-by-bytes\/\"},\"author\":{\"name\":\"Liam\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/#\/schema\/person\/23786905eb7b377f45ddb01c17da7671\"},\"headline\":\"How to read a string in Linux by bytes?\",\"datePublished\":\"2024-03-16T04:21:46+00:00\",\"dateModified\":\"2024-03-22T05:20:04+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-to-read-a-string-in-linux-by-bytes\/\"},\"wordCount\":106,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/#organization\"},\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-to-read-a-string-in-linux-by-bytes\/\",\"url\":\"https:\/\/www.silicloud.com\/blog\/how-to-read-a-string-in-linux-by-bytes\/\",\"name\":\"How to read a string in Linux by bytes? 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Here is a sample code: #include &lt;stdio.h&gt; #define BUFFER_SIZE 256 int main() { FILE *file; char buffer[BUFFER_SIZE]; int bytesRead; \/\/ \u6253\u5f00\u6587\u4ef6 file = fopen(\"file.txt\", \"rb\"); if (file == NULL) { printf(\"\u65e0\u6cd5\u6253\u5f00\u6587\u4ef6n\"); return 1; } \/\/ \u8bfb\u53d6\u6587\u4ef6\u5185\u5bb9 bytesRead = fread(buffer, [&hellip;]","og_url":"https:\/\/www.silicloud.com\/blog\/how-to-read-a-string-in-linux-by-bytes\/","og_site_name":"Blog - Silicon Cloud","article_publisher":"https:\/\/www.facebook.com\/SiliCloudGlobal\/","article_published_time":"2024-03-16T04:21:46+00:00","article_modified_time":"2024-03-22T05:20:04+00:00","author":"Liam","twitter_card":"summary_large_image","twitter_creator":"@SiliCloudGlobal","twitter_site":"@SiliCloudGlobal","twitter_misc":{"Written by":"Liam","Est. reading time":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.silicloud.com\/blog\/how-to-read-a-string-in-linux-by-bytes\/#article","isPartOf":{"@id":"https:\/\/www.silicloud.com\/blog\/how-to-read-a-string-in-linux-by-bytes\/"},"author":{"name":"Liam","@id":"https:\/\/www.silicloud.com\/blog\/#\/schema\/person\/23786905eb7b377f45ddb01c17da7671"},"headline":"How to read a string in Linux by bytes?","datePublished":"2024-03-16T04:21:46+00:00","dateModified":"2024-03-22T05:20:04+00:00","mainEntityOfPage":{"@id":"https:\/\/www.silicloud.com\/blog\/how-to-read-a-string-in-linux-by-bytes\/"},"wordCount":106,"commentCount":0,"publisher":{"@id":"https:\/\/www.silicloud.com\/blog\/#organization"},"inLanguage":"en-US"},{"@type":"WebPage","@id":"https:\/\/www.silicloud.com\/blog\/how-to-read-a-string-in-linux-by-bytes\/","url":"https:\/\/www.silicloud.com\/blog\/how-to-read-a-string-in-linux-by-bytes\/","name":"How to read a string in Linux by bytes? 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