{"id":9298,"date":"2022-09-18T06:45:22","date_gmt":"2022-09-18T01:15:22","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-wait-for-message-delivered-to-mainwindow-sent-using-sendmessage-api\/"},"modified":"2022-09-18T06:45:22","modified_gmt":"2022-09-18T01:15:22","slug":"solved-wait-for-message-delivered-to-mainwindow-sent-using-sendmessage-api","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-wait-for-message-delivered-to-mainwindow-sent-using-sendmessage-api\/","title":{"rendered":"[Solved] Wait for message delivered to MainWindow sent using SendMessage API"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-60595361\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"60595361\" data-parentid=\"60482629\" data-score=\"0\" 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>Here is the sample code in C++,(Removed error checking)<\/p>\n<p>MainWindow.cpp:<\/p>\n<pre><code>#include &lt;windows.h&gt;\n#include &lt;iostream&gt;\nLRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)\n{\n    switch (message)\n    {\n    case WM_DESTROY:\n        PostQuitMessage(0);\n        break;\n    default:\n        return DefWindowProc(hWnd, message, wParam, lParam);\n    }\n    return 0;\n}\nDWORD WINAPI createyourwindow(LPVOID param)\n{\n    WNDCLASSEXW wcex = { 0 };\n\n    wcex.cbSize = sizeof(WNDCLASSEX);\n    HWND* hWnd = (HWND*)param;\n    wcex.style = CS_HREDRAW | CS_VREDRAW;\n    wcex.lpfnWndProc = WndProc;\n    wcex.cbClsExtra = 0;\n    wcex.cbWndExtra = 0;\n    wcex.hInstance = GetModuleHandle(NULL);\n    wcex.hCursor = LoadCursor(NULL, IDC_ARROW);\n    wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);\n    wcex.lpszClassName = L\"MyClass\";\n    RegisterClassExW(&amp;wcex);\n    *hWnd = CreateWindowW(L\"MyClass\", L\"window\", WS_OVERLAPPEDWINDOW,\n        CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, GetModuleHandle(NULL), NULL);\n\n    if (!*hWnd)\n    {\n        return FALSE;\n    }\n\n    ShowWindow(*hWnd, SW_NORMAL);\n    UpdateWindow(*hWnd);\n    MSG msg;\n\n    \/\/ Main message loop:\n    while (GetMessage(&amp;msg, NULL, 0, 0))\n    {\n        if (!TranslateAccelerator(msg.hwnd, NULL, &amp;msg))\n        {\n            TranslateMessage(&amp;msg);\n            DispatchMessage(&amp;msg);\n        }\n    }\n    return 0;\n}\n\nint main()\n{\n    DWORD ThreadId;\n    HWND hwnd = NULL;\n    HANDLE hThread = CreateThread(NULL, 0, createyourwindow, (LPVOID)&amp;hwnd, 0, &amp;ThreadId);\n    MSG msg;\n    DWORD tid = GetCurrentThreadId(); \/\/ used in the PostThreadMessage().\n    \/\/ Main message loop:\n    while (GetMessage(&amp;msg, NULL, 0, 0))\n    {\n        if (msg.message == WM_USER &amp;&amp; hwnd != NULL)\n        {\n            SuspendThread(hThread);\n            printf(\"suspend\\n\");\n\n            getchar(); \/\/To Do here. \n\n            ResumeThread(hThread);\n        }\n    }\n    WaitForSingleObject(hThread, INFINITE);\n    return 0;\n\n}\n<\/code><\/pre>\n<p>PostThreadMessage.cpp:<\/p>\n<pre><code>#include &lt;windows.h&gt;\n#include &lt;iostream&gt;\nint main()\n{\n    DWORD tid = 0x....;\n    PostThreadMessage(tid,WM_USER,0,0);\n    return 0;\n}\n<\/code><\/pre>\n<p>in MainWindow.cpp, create the main window in a thread and then there is also a messageloop in the main thread just to receive your user message. And then suspend the thread of mainwindow, to do something you want, finally resume it.<\/p>\n<p>UPDATE:<\/p>\n<p>WinForm Program.cs:<\/p>\n<pre><code>using System;\nusing System.Collections.Generic;\nusing System.Linq;\nusing System.Threading.Tasks;\nusing System.Windows.Forms;\nusing System.Threading;\nusing System.Runtime.InteropServices;\nnamespace WindowsFormsApp2\n{\n    static class Program\n    {\n        static uint WM_USER = 0x0400;\n        \/\/\/ &lt;summary&gt;\n        \/\/\/ The main entry point for the application.\n        \/\/\/ &lt;\/summary&gt;\n        [STAThread]\n\n        static void Main()\n        {\n            Thread thread = new Thread(MainWindow);\n            thread.Start();\n            MSG msg = new MSG();\n            uint tid = GetCurrentThreadId();\n            while (GetMessage(ref msg, IntPtr.Zero, 0, 0) == 1)\n            {\n                if (msg.message == WM_USER)\n                {\n                    \/\/Thread.Sleep(5000);  \/\/You could still move the window for 5 second(just for test)\n                    thread.Suspend();\n\n                    Thread.Sleep(5000);  \/\/To Do here. \n\n                    thread.Resume();\n                }\n            }\n        }\n        static void MainWindow()\n        {\n            Application.EnableVisualStyles();\n            Application.SetCompatibleTextRenderingDefault(false);\n            Application.Run(new Form1());\n        }\n        [DllImport(\"user32.dll\")]\n        private static extern int GetMessage(ref MSG msg, IntPtr hwnd, uint wMsgFilterMin, uint wMsgFilterMax);\n        [DllImport(\"Kernel32.dll\")]\n        private static extern uint GetCurrentThreadId();\n        private struct MSG\n        {\n            public IntPtr hwnd;\n            public uint message;\n            public uint wParam;\n            public long lParam;\n            public ulong time;\n            public long x;\n            public long y;\n        }\n    }\n}\n<\/code><\/pre>\n<p>Then postmessage to the <code>tid<\/code>.<\/p>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">3<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved Wait for message delivered to MainWindow sent using SendMessage API <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] Here is the sample code in C++,(Removed error checking) MainWindow.cpp: #include &lt;windows.h&gt; #include &lt;iostream&gt; LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) { switch (message) { case WM_DESTROY: PostQuitMessage(0); break; default: return DefWindowProc(hWnd, message, wParam, lParam); } return 0; } DWORD WINAPI createyourwindow(LPVOID param) { WNDCLASSEXW wcex = { 0 }; wcex.cbSize &#8230; <a title=\"[Solved] Wait for message delivered to MainWindow sent using SendMessage API\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-wait-for-message-delivered-to-mainwindow-sent-using-sendmessage-api\/\" aria-label=\"More on [Solved] Wait for message delivered to MainWindow sent using SendMessage API\">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":[324,2617,683,2618,874],"class_list":["post-9298","post","type-post","status-publish","format-standard","hentry","category-solved","tag-c","tag-sendmessage","tag-winapi","tag-windows-messages","tag-wpf"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] Wait for message delivered to MainWindow sent using SendMessage API - 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-wait-for-message-delivered-to-mainwindow-sent-using-sendmessage-api\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Wait for message delivered to MainWindow sent using SendMessage API - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] Here is the sample code in C++,(Removed error checking) MainWindow.cpp: #include &lt;windows.h&gt; #include &lt;iostream&gt; LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) { switch (message) { case WM_DESTROY: PostQuitMessage(0); break; default: return DefWindowProc(hWnd, message, wParam, lParam); } return 0; } DWORD WINAPI createyourwindow(LPVOID param) { WNDCLASSEXW wcex = { 0 }; wcex.cbSize ... 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