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POWhy my context (popup) menu in WinAPI doesn't appear?
 

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  1. POWhy my context (popup) menu in WinAPI doesn't appear?
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    <p>I'm trying to setup a context menu using WinAPI in my application, but for some reason I'm not successful. The code that would pop up the menu is placed in the WM_RBUTTONUP case. However, nothing happens after right-click. Could someone tell me what am I doing wrong?</p> <p>.cpp:</p> <pre><code>#include "stdafx.h" #include "Growing_children_PAWEL_MICHNA.h" #define MAX_LOADSTRING 100 // Global Variables: HINSTANCE hInst; // current instance TCHAR szTitle[MAX_LOADSTRING]; // The title bar text //TCHAR szChild1Title[MAX_LOADSTRING]; //TCHAR szChild2Title[MAX_LOADSTRING]; TCHAR szWindowClass[MAX_LOADSTRING]; // the main window class name TCHAR szChild1WindowClass[MAX_LOADSTRING]; TCHAR szChild2WindowClass[MAX_LOADSTRING]; HWND hWnd, child1hWnd, child2hWnd; HMENU hMenu = LoadMenu(hInst, MAKEINTRESOURCE(IDR_CONTEXT_MENU)); int mywidth = 25; int myheight = 25; bool greater = true; // Forward declarations of functions included in this code module: ATOM MyRegisterClass(HINSTANCE hInstance); ATOM Child1RegisterClass(HINSTANCE hInstance); ATOM Child2RegisterClass(HINSTANCE hInstance); BOOL InitInstance(HINSTANCE, int); LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM); INT_PTR CALLBACK About(HWND, UINT, WPARAM, LPARAM); int APIENTRY _tWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPTSTR lpCmdLine, int nCmdShow) { UNREFERENCED_PARAMETER(hPrevInstance); UNREFERENCED_PARAMETER(lpCmdLine); MSG msg; HACCEL hAccelTable; // Initialize global strings LoadString(hInstance, IDS_APP_TITLE, NULL, MAX_LOADSTRING); LoadString(hInstance, IDC_GROWING_CHILDREN_PAWEL_MICHNA, szWindowClass, MAX_LOADSTRING); LoadString(hInstance, IDC_CHILD1, szChild1WindowClass, MAX_LOADSTRING); LoadString(hInstance, IDC_CHILD2, szChild2WindowClass, MAX_LOADSTRING); MyRegisterClass(hInstance); Child1RegisterClass(hInstance); Child2RegisterClass(hInstance); // Perform application initialization: if (!InitInstance (hInstance, nCmdShow)) { return FALSE; } hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_GROWING_CHILDREN_PAWEL_MICHNA)); // Main message loop: while (GetMessage(&amp;msg, NULL, 0, 0)) { if (!TranslateAccelerator(msg.hwnd, hAccelTable, &amp;msg)) { TranslateMessage(&amp;msg); DispatchMessage(&amp;msg); } } return (int) msg.wParam; } ATOM MyRegisterClass(HINSTANCE hInstance) { WNDCLASSEX wcex; HBRUSH redBrush = CreateSolidBrush(RGB(255, 0, 0)); wcex.cbSize = sizeof(WNDCLASSEX); wcex.style = NULL; //CS_HREDRAW | CS_VREDRAW; wcex.lpfnWndProc = WndProc; wcex.cbClsExtra = 0; wcex.cbWndExtra = 0; wcex.hInstance = hInstance; wcex.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_GROWING_CHILDREN_PAWEL_MICHNA)); wcex.hCursor = LoadCursor(NULL, IDC_ARROW); wcex.hbrBackground = redBrush; wcex.lpszMenuName = MAKEINTRESOURCE(NULL); wcex.lpszClassName = szWindowClass; wcex.hIconSm = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL)); return RegisterClassEx(&amp;wcex); } ATOM Child1RegisterClass(HINSTANCE hInstance) { WNDCLASSEX wcex; HBRUSH blueBrush = CreateSolidBrush(RGB(0, 0, 255)); wcex.cbSize = sizeof(WNDCLASSEX); wcex.style = CS_PARENTDC; //CS_HREDRAW | CS_VREDRAW; wcex.lpfnWndProc = WndProc; wcex.cbClsExtra = 0; wcex.cbWndExtra = 0; wcex.hInstance = hInstance; wcex.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_GROWING_CHILDREN_PAWEL_MICHNA)); wcex.hCursor = LoadCursor(NULL, IDC_ARROW); wcex.hbrBackground = blueBrush; wcex.lpszMenuName = MAKEINTRESOURCE(NULL); wcex.lpszClassName = szChild1WindowClass; wcex.hIconSm = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL)); return RegisterClassEx(&amp;wcex); } ATOM Child2RegisterClass(HINSTANCE hInstance) { WNDCLASSEX wcex; HBRUSH greenBrush = CreateSolidBrush(RGB(0, 255, 0)); wcex.cbSize = sizeof(WNDCLASSEX); wcex.style = CS_PARENTDC; //CS_HREDRAW | CS_VREDRAW; wcex.lpfnWndProc = WndProc; wcex.cbClsExtra = 0; wcex.cbWndExtra = 0; wcex.hInstance = hInstance; wcex.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_GROWING_CHILDREN_PAWEL_MICHNA)); wcex.hCursor = LoadCursor(NULL, IDC_ARROW); wcex.hbrBackground = greenBrush; wcex.lpszMenuName = MAKEINTRESOURCE(NULL); wcex.lpszClassName = szChild2WindowClass; wcex.hIconSm = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL)); return RegisterClassEx(&amp;wcex); } BOOL InitInstance(HINSTANCE hInstance, int nCmdShow) { hInst = hInstance; // Store instance handle in our global variable hWnd = CreateWindowEx(WS_EX_TOPMOST | WS_EX_LAYERED, szWindowClass, NULL, WS_POPUPWINDOW, CW_USEDEFAULT, 0, 500, 500, NULL, NULL, hInstance, NULL); if (!hWnd) { return FALSE; } // Set windows transparency to 70% SetLayeredWindowAttributes(hWnd, 0, (255 * 70) / 100, LWA_ALPHA); RECT rc; // get the center of the work area of the system SystemParametersInfo(SPI_GETWORKAREA, 0, &amp;rc, 0); int centerX = (rc.left + rc.right + 1) / 2; int centerY = (rc.top + rc.bottom + 1) / 2; //move the main windows to the center MoveWindow(hWnd, centerX-250, centerY-250, 500, 500, true); child1hWnd = CreateWindow(szChild1WindowClass, NULL, WS_CHILD, 0, 0, 25, 25, hWnd, NULL, hInstance, NULL); SetLayeredWindowAttributes(child1hWnd, 0, (255 * 70) / 100, LWA_ALPHA); child2hWnd = CreateWindow(szChild2WindowClass, NULL, WS_CHILD, 475, 476, 25, 25, hWnd, NULL, hInstance, NULL); SetLayeredWindowAttributes(child2hWnd, 0, (255 * 70) / 100, LWA_ALPHA); ShowWindow(hWnd, nCmdShow); ShowWindow(child1hWnd, nCmdShow); ShowWindow(child2hWnd, nCmdShow); UpdateWindow(hWnd); UpdateWindow(child1hWnd); UpdateWindow(child2hWnd); return TRUE; } LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) { int wmId, wmEvent; PAINTSTRUCT ps; HDC hdc; POINT point; switch (message) { case WM_COMMAND: wmId = LOWORD(wParam); wmEvent = HIWORD(wParam); // Parse the menu selections: switch (wmId) { case IDM_ABOUT: DialogBox(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, About); break; case IDM_EXIT: DestroyWindow(hWnd); break; default: return DefWindowProc(hWnd, message, wParam, lParam); } break; case WM_CREATE: { SetTimer(hWnd, 1, 100, NULL); return 0; } break; case WM_RBUTTONUP: { point.x = LOWORD(lParam); point.y = HIWORD(lParam); ClientToScreen(hWnd, &amp;point); TrackPopupMenu(hMenu, TPM_RIGHTBUTTON, point.x, point.y, 0, hWnd, NULL); return 0; } case WM_TIMER: if(mywidth &lt; 250 &amp;&amp; greater == true) { MoveWindow(child1hWnd, 0, 0, ++mywidth, ++myheight, true); MoveWindow(child2hWnd, 500-mywidth, 500-myheight, mywidth, myheight, true); if(mywidth == 250) greater = false; } else { MoveWindow(child1hWnd, 0, 0, --mywidth, --myheight, true); MoveWindow(child2hWnd, 500-mywidth, 500-myheight, mywidth, myheight, true); if(mywidth == 0) greater = true; } break; case WM_PAINT: hdc = BeginPaint(hWnd, &amp;ps); EndPaint(hWnd, &amp;ps); break; case WM_DESTROY: PostQuitMessage(0); break; case WM_NCHITTEST: if (hWnd == child1hWnd || hWnd == child2hWnd) return HTTRANSPARENT; return HTCAPTION; break; default: return DefWindowProc(hWnd, message, wParam, lParam); } return 0; } // Message handler for about box. INT_PTR CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam) { UNREFERENCED_PARAMETER(lParam); switch (message) { case WM_INITDIALOG: return (INT_PTR)TRUE; case WM_COMMAND: if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL) { EndDialog(hDlg, LOWORD(wParam)); return (INT_PTR)TRUE; } break; } return (INT_PTR)FALSE; } </code></pre> <p>.rc fragment:</p> <pre><code>IDR_CONTEXT_MENU MENU BEGIN MENUITEM "Color", ID_COLOR32778 POPUP "Figures" BEGIN MENUITEM "None", ID_FIGURES_NONE, CHECKED MENUITEM "Square", ID_FIGURES_SQUARE MENUITEM "Triangle", ID_FIGURES_TRIANGLE MENUITEM "Circle", ID_FIGURES_CIRCLE END MENUITEM "Exit", ID_EXIT END </code></pre>
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    1. USpmichna
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    1. COAs a FYI - you should handle [WM_CONTEXTMENU](http://msdn.microsoft.com/en-us/library/windows/desktop/ms647592(v=vs.85).aspx) rather than WM_RBUTTONUP: that will get fired on both right-click and also on the context menu key, ensuring that your app is keyboard accessible.
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      1. POWhy my context (popup) menu in WinAPI doesn't appear?
      1. USBrendanMcK
 

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