{"id":20030,"date":"2022-11-08T13:00:36","date_gmt":"2022-11-08T07:30:36","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-permanent-threads-in-qt\/"},"modified":"2022-11-08T13:00:36","modified_gmt":"2022-11-08T07:30:36","slug":"solved-permanent-threads-in-qt","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-permanent-threads-in-qt\/","title":{"rendered":"[Solved] Permanent Threads in QT"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-22552561\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"22552561\" data-parentid=\"22542247\" data-score=\"1\" data-position-on-page=\"1\" data-highest-scored=\"1\" data-question-has-accepted-highest-score=\"1\" itemprop=\"acceptedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<p>You should use Qt <a rel=\"nofollow noopener\" target=\"_blank\" href=\"http:\/\/qt-project.org\/doc\/qt-4.8\/signalsandslots.html\">signaling<\/a> mechanism.<\/p>\n<pre><code>class QWindow : QMainWindow\n{\n\/\/this macro is important for QMake to let the meta programming mechanism know \n\/\/this class uses Qt signalling\nQ_OBJECT \nslots:\nvoid updateLabel(QString withWhat)\n...\n};\n<\/code><\/pre>\n<p>And now You just need to connect this slot to some signal<\/p>\n<pre><code>class SomeThreadClass : QObject\n{\nQ_OBJECT\n...\nsignals:\nvoid labelUpdateRequest(QString withwhat);\n};\n<\/code><\/pre>\n<p>in the constructor of the window<\/p>\n<pre><code>QWindow::QWindow(QWidget* parent) : QMainWindow(parent)\n{\nm_someThread = new SomeThreadClass();\n\n\/\/in old style Qt, now there's a mechanism for compile time check\n\/\/don't use pointers, you need to free them at some point and there might be many receivers\n\/\/that might use it \nconnect(m_someThread, SIGNAL(labelUpdateRequest(QString)), this, SLOT(updateLabel(QString));\n...\n}\n<\/code><\/pre>\n<p>now just at some point in the thread:<\/p>\n<pre><code>SomeThreadClass::someMethod()\n{\n\/\/do something...\nemit labelUpdateRequest(QString(\"Welcome to cartmanland!\"));\n\/\/this will be received by all classes that call connect to this class.\n}\n<\/code><\/pre>\n<p>Hope that helps \ud83d\ude42<\/p>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">0<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved Permanent Threads in QT <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] You should use Qt signaling mechanism. class QWindow : QMainWindow { \/\/this macro is important for QMake to let the meta programming mechanism know \/\/this class uses Qt signalling Q_OBJECT slots: void updateLabel(QString withWhat) &#8230; }; And now You just need to connect this slot to some signal class SomeThreadClass : QObject { Q_OBJECT &#8230; <a title=\"[Solved] Permanent Threads in QT\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-permanent-threads-in-qt\/\" aria-label=\"More on [Solved] Permanent Threads in QT\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[884,1088,728],"class_list":["post-20030","post","type-post","status-publish","format-standard","hentry","category-solved","tag-multithreading","tag-qt","tag-user-interface"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] Permanent Threads in QT - JassWeb<\/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:\/\/jassweb.com\/solved\/solved-permanent-threads-in-qt\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Permanent Threads in QT - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] You should use Qt signaling mechanism. class QWindow : QMainWindow { \/\/this macro is important for QMake to let the meta programming mechanism know \/\/this class uses Qt signalling Q_OBJECT slots: void updateLabel(QString withWhat) ... }; And now You just need to connect this slot to some signal class SomeThreadClass : QObject { Q_OBJECT ... 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And now You just need to connect this slot to some signal class SomeThreadClass : QObject { Q_OBJECT ... 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