Create a system tray icon using Win32 API

System pallets are common in our programs. Here is a good example. Using Win32 API is helpful for understanding system pallets.

# Include <windows. h> # define IDR_PAUSE 12 # define IDR_START 13/* # include <shellapi. h> # pragma comment (lib, "shell32.lib") */LPCTSTR szAppName = TEXT ("service program"); LPCTSTR szWndName = TEXT ("service program"); HMENU hmenu; // menu handle lresult callback WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) {policyicondata nid; UINT WM_TASKBARCREATED; POINT pt; // used to receive the mouse coordinate int xx; // receives the return value of the menu option. // do not modify TaskbarCreated, which is a custom message in the system taskbar. WM_TASKBARCREATED = RegisterWindowMessage (TEXT ("TaskbarCreated"); switch (message) {case WM_CREATE: // message generated when the window is created. nid. cbSize = sizeof (nid); nid. hWnd = hwnd; nid. uID = 0; nid. uFlags = NIF_ICON | NIF_MESSAGE | NIF_TIP; nid. uCallbackMessage = WM_USER; nid. hIcon = LoadIcon (NULL, IDI_APPLICATION); lstrcpy (nid. szTip, szAppName); shell_policyicon (NIM_ADD, & nid); hmenu = CreatePopupMenu (); // generate the menu AppendMenu (hmenu, MF_STRI NG, IDR_PAUSE, "suspend service"); // Add two options for the menu: AppendMenu (hmenu, MF_STRING, IDR_START, "restore service"); break; case WM_USER: // messages generated when the program is used continuously. if (lParam = WM_LBUTTONDOWN) MessageBox (hwnd, TEXT ("Win32 API Implementation System Tray program, double-click the tray to exit! "), SzAppName, MB_ OK); if (lParam = WM_LBUTTONDBLCLK) // double-click the message on the tray and exit. sendMessage (hwnd, WM_CLOSE, wParam, lParam); if (lParam = WM_RBUTTONDOWN) {GetCursorPos (& pt); // take the mouse coordinate: SetForegroundWindow (hwnd ); // EnableMenuItem (hmenu, IDR_PAUSE, MF_GRAYED) solves the problem that the left-click menu does not disappear. // gray xx = TrackPopupMenu (hmenu, TPM_RETURNCMD, pt. x, pt. y, NULL, hwnd, NULL); // display the menu and obtain the IDif (xx = IDR_PAUSE) MessageBox (hwnd, TEXT ("111"), szAppName, MB_ OK); if (xx = IDR_START) MessageBox (hwnd, TEXT ("222"), szAppName, MB_ OK); if (xx = 0) PostMessage (hwnd, WM_LBUTTONDOWN, NULL, NULL); // MessageBox (hwnd, TEXT ("right-click"), szAppName, MB_ OK) ;}break; case WM_DESTROY: // message when the window is destroyed. shell_policyicon (NIM_DELETE, & nid); PostQuitMessage (0); break; default:/** when assumer.exe crashes, the icons in the system tray disappear ** principle: after assumer.exe is reloaded, the system taskbar is rebuilt. When the system taskbar is set up, a message will be sent to all top-level windows in the system that * Register to receive TaskbarCreated messages. We only need to capture this message and re-create the * System Tray Icon. */If (message = WM_TASKBARCREATED) SendMessage (hwnd, WM_CREATE, wParam, lParam); break;} return DefWindowProc (hwnd, message, wParam, lParam );} int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR szCmdLine, int iCmdShow) {HWND hwnd; MSG msg; WNDCLASS wndclass; HWND handle = FindWindow (NULL, szWndName); if (handle! = NULL) {MessageBox (NULL, TEXT ("Application is already running"), szAppName, MB_ICONERROR); return 0;} wndclass. style = CS_HREDRAW | CS_VREDRAW; wndclass. lpfnWndProc = WndProc; wndclass. cbClsExtra = 0; wndclass. cbWndExtra = 0; wndclass. hInstance = hInstance; wndclass. hIcon = LoadIcon (NULL, IDI_APPLICATION); wndclass. hCursor = LoadCursor (NULL, IDC_ARROW); wndclass. hbrBackground = (HBRUSH) GetStockObject (WHITE _ BRUSH); wndclass. lpszMenuName = NULL; wndclass. lpszClassName = szAppName; if (! RegisterClass (& wndclass) {MessageBox (NULL, TEXT ("This program requires Windows NT! "), SzAppName, MB_ICONERROR); return 0;} // here the WS_EX_TOOLWINDOW attribute is used to hide the window program button hwnd = createjavaswex (WS_EX_TOOLWINDOW, szAppName, szWndName, WS_POPUP, CW_USEDEFAULT, NULL, NULL, hInstance, NULL); ShowWindow (hwnd, iCmdShow); UpdateWindow (hwnd); while (GetMessage (& msg, NULL, 0, 0) {TranslateMessage (& msg); DispatchMessage (& msg);} return msg. wParam ;}