{"id":5152,"date":"2024-03-14T02:26:56","date_gmt":"2024-03-14T02:26:56","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/what-is-the-method-for-cutting-a-qt-string\/"},"modified":"2025-08-01T11:24:22","modified_gmt":"2025-08-01T11:24:22","slug":"what-is-the-method-for-cutting-a-qt-string","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/what-is-the-method-for-cutting-a-qt-string\/","title":{"rendered":"Qt Substring Extraction Guide: mid() Method"},"content":{"rendered":"<p>In Qt, the method for substring extraction is using the &#8220;mid&#8221; function, which takes two parameters: the starting position and the length of the substring to extract. An example is shown below:<\/p>\n<pre class=\"post-pre\"><code>QString str = <span class=\"hljs-string\">\"Hello, World!\"<\/span>;\r\nQString subStr = str.<span class=\"hljs-built_in\">mid<\/span>(<span class=\"hljs-number\">7<\/span>, <span class=\"hljs-number\">5<\/span>); <span class=\"hljs-comment\">\/\/ \u4ece\u4f4d\u7f6e7\u5f00\u59cb\u622a\u53d6\u957f\u5ea6\u4e3a5\u7684\u5b50\u5b57\u7b26\u4e32<\/span>\r\n<span class=\"hljs-built_in\">qDebug<\/span>() &lt;&lt; subStr; <span class=\"hljs-comment\">\/\/ \u8f93\u51fa \"World\"<\/span>\r\n<\/code><\/pre>\n<p>In addition to the mid function, you can also use the left and right functions to extract the left and right parts of a string. Examples are as follows:<\/p>\n<pre class=\"post-pre\"><code>QString str = <span class=\"hljs-string\">\"Hello, World!\"<\/span>;\r\nQString leftStr = str.<span class=\"hljs-built_in\">left<\/span>(<span class=\"hljs-number\">5<\/span>); <span class=\"hljs-comment\">\/\/ \u622a\u53d6\u5de6\u8fb95\u4e2a\u5b57\u7b26<\/span>\r\nQString rightStr = str.<span class=\"hljs-built_in\">right<\/span>(<span class=\"hljs-number\">6<\/span>); <span class=\"hljs-comment\">\/\/ \u622a\u53d6\u53f3\u8fb96\u4e2a\u5b57\u7b26<\/span>\r\n<span class=\"hljs-built_in\">qDebug<\/span>() &lt;&lt; leftStr; <span class=\"hljs-comment\">\/\/ \u8f93\u51fa \"Hello\"<\/span>\r\n<span class=\"hljs-built_in\">qDebug<\/span>() &lt;&lt; rightStr; <span class=\"hljs-comment\">\/\/ \u8f93\u51fa \"World!\"<\/span>\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>In Qt, the method for substring extraction is using the &#8220;mid&#8221; function, which takes two parameters: the starting position and the length of the substring to extract. An example is shown below: QString str = &#8220;Hello, World!&#8221;; QString subStr = str.mid(7, 5); \/\/ \u4ece\u4f4d\u7f6e7\u5f00\u59cb\u622a\u53d6\u957f\u5ea6\u4e3a5\u7684\u5b50\u5b57\u7b26\u4e32 qDebug() &lt;&lt; subStr; \/\/ \u8f93\u51fa &#8220;World&#8221; In addition to the mid [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[5487,5486,5488,5485,5484],"class_list":["post-5152","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-qt-left-right","tag-qt-mid-function","tag-qt-string-cutting","tag-qt-string-manipulation","tag-qt-substring"],"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>Qt Substring Extraction Guide: mid() Method - 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