{"id":21622,"date":"2024-03-15T22:21:53","date_gmt":"2024-03-15T22:21:53","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/simple-operation-of-file-api-in-c-c\/"},"modified":"2024-03-21T20:55:36","modified_gmt":"2024-03-21T20:55:36","slug":"simple-operation-of-file-api-in-c-c","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/simple-operation-of-file-api-in-c-c\/","title":{"rendered":"Simple operation of file API in C\/C++"},"content":{"rendered":"<p>The C\/C++ file API is a set of functions used for manipulating files, such as creating, opening, reading, writing, and closing. Here are some common examples of simple file operations using the C\/C++ file API:<\/p>\n<ol>\n<li>Create a file.<\/li>\n<\/ol>\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-type\">int<\/span> <span class=\"hljs-title function_\">main<\/span><span class=\"hljs-params\">()<\/span> {\r\n    FILE *file;\r\n    file = fopen(<span class=\"hljs-string\">\"example.txt\"<\/span>, <span class=\"hljs-string\">\"w\"<\/span>);  <span class=\"hljs-comment\">\/\/ \u6253\u5f00\u6587\u4ef6\uff0c\u5982\u679c\u4e0d\u5b58\u5728\u5219\u65b0\u5efa<\/span>\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\u521b\u5efa\u6587\u4ef6\\n\"<\/span>);\r\n        <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">1<\/span>;\r\n    }\r\n    fclose(file);  <span class=\"hljs-comment\">\/\/ \u5173\u95ed\u6587\u4ef6<\/span>\r\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">0<\/span>;\r\n}\r\n<\/code><\/pre>\n<ol>\n<li>Write to file.<\/li>\n<\/ol>\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-type\">int<\/span> <span class=\"hljs-title function_\">main<\/span><span class=\"hljs-params\">()<\/span> {\r\n    FILE *file;\r\n    file = fopen(<span class=\"hljs-string\">\"example.txt\"<\/span>, <span class=\"hljs-string\">\"w\"<\/span>);\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    <span class=\"hljs-built_in\">fprintf<\/span>(file, <span class=\"hljs-string\">\"Hello, World!\\n\"<\/span>);  <span class=\"hljs-comment\">\/\/ \u5199\u5165\u5185\u5bb9<\/span>\r\n    fclose(file);\r\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">0<\/span>;\r\n}\r\n<\/code><\/pre>\n<ol>\n<li>Read the file:<\/li>\n<\/ol>\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-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[<span class=\"hljs-number\">255<\/span>];\r\n    file = fopen(<span class=\"hljs-string\">\"example.txt\"<\/span>, <span class=\"hljs-string\">\"r\"<\/span>);\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    fgets(buffer, <span class=\"hljs-keyword\">sizeof<\/span>(buffer), file);  <span class=\"hljs-comment\">\/\/ \u8bfb\u53d6\u4e00\u884c\u5185\u5bb9<\/span>\r\n    <span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"\u8bfb\u53d6\u5185\u5bb9\uff1a%s\"<\/span>, buffer);\r\n    fclose(file);\r\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">0<\/span>;\r\n}\r\n<\/code><\/pre>\n<ol>\n<li>Add additional content to the file.<\/li>\n<\/ol>\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-type\">int<\/span> <span class=\"hljs-title function_\">main<\/span><span class=\"hljs-params\">()<\/span> {\r\n    FILE *file;\r\n    file = fopen(<span class=\"hljs-string\">\"example.txt\"<\/span>, <span class=\"hljs-string\">\"a\"<\/span>);\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    <span class=\"hljs-built_in\">fprintf<\/span>(file, <span class=\"hljs-string\">\"This is appended content.\\n\"<\/span>);  <span class=\"hljs-comment\">\/\/ \u8ffd\u52a0\u5185\u5bb9<\/span>\r\n    fclose(file);\r\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">0<\/span>;\r\n}\r\n<\/code><\/pre>\n<p>These examples only cover the basic usage of some file APIs in the C language, and there are similar file operation functions in C++. In actual development, there are also more file operation functions and error handling mechanisms to consider.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The C\/C++ file API is a set of functions used for manipulating files, such as creating, opening, reading, writing, and closing. Here are some common examples of simple file operations using the C\/C++ file API: Create a file. #include &lt;stdio.h&gt; int main() { FILE *file; file = fopen(&#8220;example.txt&#8221;, &#8220;w&#8221;); \/\/ \u6253\u5f00\u6587\u4ef6\uff0c\u5982\u679c\u4e0d\u5b58\u5728\u5219\u65b0\u5efa if (file == NULL) [&hellip;]<\/p>\n","protected":false},"author":7,"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-21622","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>Simple operation of file API in C\/C++ - 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\/simple-operation-of-file-api-in-c-c\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Simple operation of file API in C\/C++\" \/>\n<meta property=\"og:description\" content=\"The C\/C++ file API is a set of functions used for manipulating files, such as creating, opening, reading, writing, and closing. Here are some common examples of simple file operations using the C\/C++ file API: Create a file. #include &lt;stdio.h&gt; int main() { FILE *file; file = fopen(&quot;example.txt&quot;, &quot;w&quot;); \/\/ \u6253\u5f00\u6587\u4ef6\uff0c\u5982\u679c\u4e0d\u5b58\u5728\u5219\u65b0\u5efa if (file == NULL) [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/blog\/simple-operation-of-file-api-in-c-c\/\" \/>\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=\"2024-03-15T22:21:53+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-03-21T20:55:36+00:00\" \/>\n<meta name=\"author\" content=\"Sophia Anderson\" \/>\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=\"Sophia Anderson\" \/>\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\/simple-operation-of-file-api-in-c-c\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/simple-operation-of-file-api-in-c-c\/\"},\"author\":{\"name\":\"Sophia Anderson\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/#\/schema\/person\/19a24313de9c988db3d69226b4a40a30\"},\"headline\":\"Simple operation of file API in C\/C++\",\"datePublished\":\"2024-03-15T22:21:53+00:00\",\"dateModified\":\"2024-03-21T20:55:36+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/simple-operation-of-file-api-in-c-c\/\"},\"wordCount\":100,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/#organization\"},\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/simple-operation-of-file-api-in-c-c\/\",\"url\":\"https:\/\/www.silicloud.com\/blog\/simple-operation-of-file-api-in-c-c\/\",\"name\":\"Simple operation of file API in C\/C++ - 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