{"id":18327,"date":"2024-03-15T16:42:33","date_gmt":"2024-03-15T16:42:33","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-call-a-c-language-function-in-qt\/"},"modified":"2024-03-21T13:02:37","modified_gmt":"2024-03-21T13:02:37","slug":"how-to-call-a-c-language-function-in-qt","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-call-a-c-language-function-in-qt\/","title":{"rendered":"How to call a C language function in Qt?"},"content":{"rendered":"<p>In Qt, calling C language functions can be done using Qt&#8217;s QLibrary class and QLibrary::resolve() function.<\/p>\n<p>Firstly, use the QLibrary class to load a dynamic link library (.dll or .so file) that contains C language functions.<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-function\">QLibrary <span class=\"hljs-title\">library<\/span><span class=\"hljs-params\">(<span class=\"hljs-string\">\"path\/to\/library.dll\"<\/span>)<\/span><\/span>; <span class=\"hljs-comment\">\/\/ \u66ff\u6362\u4e3a\u52a8\u6001\u94fe\u63a5\u5e93\u7684\u8def\u5f84<\/span>\r\n\r\n<span class=\"hljs-keyword\">if<\/span> (library.<span class=\"hljs-built_in\">load<\/span>()) {\r\n    <span class=\"hljs-comment\">\/\/ \u52a8\u6001\u94fe\u63a5\u5e93\u52a0\u8f7d\u6210\u529f<\/span>\r\n\r\n    <span class=\"hljs-comment\">\/\/ \u4f7f\u7528QLibrary::resolve()\u51fd\u6570\u83b7\u53d6C\u8bed\u8a00\u51fd\u6570\u7684\u6307\u9488<\/span>\r\n    <span class=\"hljs-function\"><span class=\"hljs-keyword\">typedef<\/span> <span class=\"hljs-title\">int<\/span> <span class=\"hljs-params\">(*CFunction)<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">int<\/span>)<\/span><\/span>; <span class=\"hljs-comment\">\/\/ \u66ff\u6362\u4e3aC\u8bed\u8a00\u51fd\u6570\u7684\u51fd\u6570\u6307\u9488\u7c7b\u578b<\/span>\r\n    CFunction cFunction = <span class=\"hljs-built_in\">reinterpret_cast<\/span>&lt;CFunction&gt;(library.<span class=\"hljs-built_in\">resolve<\/span>(<span class=\"hljs-string\">\"c_function\"<\/span>)); <span class=\"hljs-comment\">\/\/ \u66ff\u6362\u4e3aC\u8bed\u8a00\u51fd\u6570\u7684\u540d\u79f0<\/span>\r\n\r\n    <span class=\"hljs-keyword\">if<\/span> (cFunction) {\r\n        <span class=\"hljs-comment\">\/\/ C\u8bed\u8a00\u51fd\u6570\u83b7\u53d6\u6210\u529f<\/span>\r\n\r\n        <span class=\"hljs-comment\">\/\/ \u8c03\u7528C\u8bed\u8a00\u51fd\u6570<\/span>\r\n        <span class=\"hljs-type\">int<\/span> result = <span class=\"hljs-built_in\">cFunction<\/span>(<span class=\"hljs-number\">42<\/span>); <span class=\"hljs-comment\">\/\/ \u66ff\u6362\u4e3a\u5b9e\u9645\u7684\u53c2\u6570<\/span>\r\n\r\n        <span class=\"hljs-comment\">\/\/ \u5904\u7406C\u8bed\u8a00\u51fd\u6570\u7684\u8fd4\u56de\u503c<\/span>\r\n        <span class=\"hljs-comment\">\/\/ ...<\/span>\r\n    } <span class=\"hljs-keyword\">else<\/span> {\r\n        <span class=\"hljs-comment\">\/\/ C\u8bed\u8a00\u51fd\u6570\u83b7\u53d6\u5931\u8d25<\/span>\r\n        <span class=\"hljs-comment\">\/\/ ...<\/span>\r\n    }\r\n\r\n    <span class=\"hljs-comment\">\/\/ \u5378\u8f7d\u52a8\u6001\u94fe\u63a5\u5e93<\/span>\r\n    library.<span class=\"hljs-built_in\">unload<\/span>();\r\n} <span class=\"hljs-keyword\">else<\/span> {\r\n    <span class=\"hljs-comment\">\/\/ \u52a8\u6001\u94fe\u63a5\u5e93\u52a0\u8f7d\u5931\u8d25<\/span>\r\n    <span class=\"hljs-comment\">\/\/ ...<\/span>\r\n}\r\n<\/code><\/pre>\n<p>In the code above, replace &#8220;path\/to\/library.dll&#8221; with the actual path of the dynamic linked library file, &#8220;CFunction&#8221; with the actual function pointer type of the C language function, and &#8220;c_function&#8221; with the actual name of the C language function.<\/p>\n<p>Please remember to use reinterpret_cast when using the QLibrary::resolve() function to obtain a pointer to a C function, in order to ensure that the types match.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In Qt, calling C language functions can be done using Qt&#8217;s QLibrary class and QLibrary::resolve() function. Firstly, use the QLibrary class to load a dynamic link library (.dll or .so file) that contains C language functions. QLibrary library(&#8220;path\/to\/library.dll&#8221;); \/\/ \u66ff\u6362\u4e3a\u52a8\u6001\u94fe\u63a5\u5e93\u7684\u8def\u5f84 if (library.load()) { \/\/ \u52a8\u6001\u94fe\u63a5\u5e93\u52a0\u8f7d\u6210\u529f \/\/ \u4f7f\u7528QLibrary::resolve()\u51fd\u6570\u83b7\u53d6C\u8bed\u8a00\u51fd\u6570\u7684\u6307\u9488 typedef int (*CFunction)(int); \/\/ \u66ff\u6362\u4e3aC\u8bed\u8a00\u51fd\u6570\u7684\u51fd\u6570\u6307\u9488\u7c7b\u578b CFunction cFunction = [&hellip;]<\/p>\n","protected":false},"author":13,"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-18327","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 call a C language function in Qt? - 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-call-a-c-language-function-in-qt\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to call a C language function in Qt?\" \/>\n<meta property=\"og:description\" content=\"In Qt, calling C language functions can be done using Qt&#8217;s QLibrary class and QLibrary::resolve() function. Firstly, use the QLibrary class to load a dynamic link library (.dll or .so file) that contains C language functions. QLibrary library(&quot;path\/to\/library.dll&quot;); \/\/ \u66ff\u6362\u4e3a\u52a8\u6001\u94fe\u63a5\u5e93\u7684\u8def\u5f84 if (library.load()) { \/\/ \u52a8\u6001\u94fe\u63a5\u5e93\u52a0\u8f7d\u6210\u529f \/\/ \u4f7f\u7528QLibrary::resolve()\u51fd\u6570\u83b7\u53d6C\u8bed\u8a00\u51fd\u6570\u7684\u6307\u9488 typedef int (*CFunction)(int); \/\/ \u66ff\u6362\u4e3aC\u8bed\u8a00\u51fd\u6570\u7684\u51fd\u6570\u6307\u9488\u7c7b\u578b CFunction cFunction = [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/blog\/how-to-call-a-c-language-function-in-qt\/\" \/>\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=\"2024-03-15T16:42:33+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-03-21T13:02:37+00:00\" \/>\n<meta name=\"author\" content=\"Isabella Edwards\" \/>\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=\"Isabella Edwards\" \/>\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-call-a-c-language-function-in-qt\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-to-call-a-c-language-function-in-qt\/\"},\"author\":{\"name\":\"Isabella Edwards\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/#\/schema\/person\/5579144e23c225c8188167f3e3f888dd\"},\"headline\":\"How to call a C language function in Qt?\",\"datePublished\":\"2024-03-15T16:42:33+00:00\",\"dateModified\":\"2024-03-21T13:02:37+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-to-call-a-c-language-function-in-qt\/\"},\"wordCount\":118,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/#organization\"},\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-to-call-a-c-language-function-in-qt\/\",\"url\":\"https:\/\/www.silicloud.com\/blog\/how-to-call-a-c-language-function-in-qt\/\",\"name\":\"How to call a C language function in Qt? 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Firstly, use the QLibrary class to load a dynamic link library (.dll or .so file) that contains C language functions. QLibrary library(\"path\/to\/library.dll\"); \/\/ \u66ff\u6362\u4e3a\u52a8\u6001\u94fe\u63a5\u5e93\u7684\u8def\u5f84 if (library.load()) { \/\/ \u52a8\u6001\u94fe\u63a5\u5e93\u52a0\u8f7d\u6210\u529f \/\/ \u4f7f\u7528QLibrary::resolve()\u51fd\u6570\u83b7\u53d6C\u8bed\u8a00\u51fd\u6570\u7684\u6307\u9488 typedef int (*CFunction)(int); \/\/ \u66ff\u6362\u4e3aC\u8bed\u8a00\u51fd\u6570\u7684\u51fd\u6570\u6307\u9488\u7c7b\u578b CFunction cFunction = [&hellip;]","og_url":"https:\/\/www.silicloud.com\/blog\/how-to-call-a-c-language-function-in-qt\/","og_site_name":"Blog - Silicon Cloud","article_publisher":"https:\/\/www.facebook.com\/SiliCloudGlobal\/","article_published_time":"2024-03-15T16:42:33+00:00","article_modified_time":"2024-03-21T13:02:37+00:00","author":"Isabella Edwards","twitter_card":"summary_large_image","twitter_creator":"@SiliCloudGlobal","twitter_site":"@SiliCloudGlobal","twitter_misc":{"Written by":"Isabella Edwards","Est. reading time":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.silicloud.com\/blog\/how-to-call-a-c-language-function-in-qt\/#article","isPartOf":{"@id":"https:\/\/www.silicloud.com\/blog\/how-to-call-a-c-language-function-in-qt\/"},"author":{"name":"Isabella Edwards","@id":"https:\/\/www.silicloud.com\/blog\/#\/schema\/person\/5579144e23c225c8188167f3e3f888dd"},"headline":"How to call a C language function in Qt?","datePublished":"2024-03-15T16:42:33+00:00","dateModified":"2024-03-21T13:02:37+00:00","mainEntityOfPage":{"@id":"https:\/\/www.silicloud.com\/blog\/how-to-call-a-c-language-function-in-qt\/"},"wordCount":118,"commentCount":0,"publisher":{"@id":"https:\/\/www.silicloud.com\/blog\/#organization"},"inLanguage":"en-US"},{"@type":"WebPage","@id":"https:\/\/www.silicloud.com\/blog\/how-to-call-a-c-language-function-in-qt\/","url":"https:\/\/www.silicloud.com\/blog\/how-to-call-a-c-language-function-in-qt\/","name":"How to call a C language function in Qt? 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