home *** CD-ROM | disk | FTP | other *** search
- /****************************************************************************
-
- PROGRAM: Generic.c
-
- PURPOSE: Generic template for Windows applications
-
- FUNCTIONS:
-
- WinMain() - calls initialization function, processes message loop
- InitApplication() - initializes window data and registers window
- InitInstance() - saves instance handle and creates main window
- MainWndProc() - processes messages
- About() - processes messages for "About" dialog box
-
- COMMENTS:
-
- Windows can have several copies of your application running at the
- same time. The variable hInst keeps track of which instance this
- application is so that processing will be to the correct window.
-
- ****************************************************************************/
-
- #include <windows.h> /* required for all Windows applications */
- #include "generic.h" /* specific to this program */
-
- HANDLE hInst; /* current instance */
-
- /****************************************************************************
-
- FUNCTION: WinMain(HANDLE, HANDLE, LPSTR, int)
-
- PURPOSE: calls initialization function, processes message loop
-
- COMMENTS:
-
- Windows recognizes this function by name as the initial entry point
- for the program. This function calls the application initialization
- routine, if no other instance of the program is running, and always
- calls the instance initialization routine. It then executes a message
- retrieval and dispatch loop that is the top-level control structure
- for the remainder of execution. The loop is terminated when a WM_QUIT
- message is received, at which time this function exits the application
- instance by returning the value passed by PostQuitMessage().
-
- If this function must abort before entering the message loop, it
- returns the conventional value NULL.
-
- ****************************************************************************/
-
- int PASCAL WinMain(HANDLE hInstance, HANDLE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
- {
- MSG msg; /* message */
-
- if (!hPrevInstance) /* Other instances of app running? */
- if (!InitApplication(hInstance)) /* Initialize shared things */
- return (FALSE); /* Exits if unable to initialize */
-
- /* Perform initializations that apply to a specific instance */
- if (!InitInstance(hInstance, nCmdShow))
- return (FALSE);
-
- /* Acquire and dispatch messages until a WM_QUIT message is received. */
- while (GetMessage(&msg, /* message structure */
- NULL, /* handle of window receiving the message */
- NULL, /* lowest message to examine */
- NULL)) /* highest message to examine */
- {
- TranslateMessage(&msg); /* Translates virtual key codes */
- DispatchMessage(&msg); /* Dispatches message to window */
- }
- return (msg.wParam); /* Returns the value from PostQuitMessage */
- }
-
-
- /****************************************************************************
-
- FUNCTION: InitApplication(HANDLE)
-
- PURPOSE: Initializes window data and registers window class
-
- COMMENTS:
-
- This function is called at initialization time only if no other
- instances of the application are running. This function performs
- initialization tasks that can be done once for any number of running
- instances.
-
- In this case, we initialize a window class by filling out a data
- structure of type WNDCLASS and calling the Windows RegisterClass()
- function. Since all instances of this application use the same window
- class, we only need to do this when the first instance is initialized.
-
-
- ****************************************************************************/
-
- BOOL InitApplication(HANDLE hInstance)
- {
- WNDCLASS wc;
-
- /* Fill in window class structure with parameters that describe the
- main window. */
-
- wc.style = NULL; /* Class style(s) */
- wc.lpfnWndProc = MainWndProc; /* Function to retrieve messages for */
- /* windows of this class */
- wc.cbClsExtra = 0; /* No per-class extra data */
- wc.cbWndExtra = 0; /* No per-window extra data */
- wc.hInstance = hInstance; /* Application that owns the class */
- wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
- wc.hCursor = LoadCursor(NULL, IDC_ARROW);
- wc.hbrBackground = GetStockObject(WHITE_BRUSH);
- wc.lpszMenuName = "GenericMenu"; /* Name of menu resource in .RC file. */
- wc.lpszClassName = "GenericWClass"; /* Name used in call to CreateWindow. */
-
- /* Register the window class and return success/failure code. */
- return (RegisterClass(&wc));
- }
-
- /****************************************************************************
-
- FUNCTION: InitInstance(HANDLE, int)
-
- PURPOSE: Saves instance handle and creates main window
-
- COMMENTS:
-
- This function is called at initialization time for every instance of
- this application. This function performs initialization tasks that
- cannot be shared by multiple instances.
-
- In this case, we save the instance handle in a static variable and
- create and display the main program window.
-
- ****************************************************************************/
-
- BOOL InitInstance(HANDLE hInstance, int nCmdShow)
- {
- HWND hWnd; /* Main window handle */
-
- /* Save the instance handle in static variable, which will be used in
- many subsequent calls from this application to Windows. */
-
- hInst = hInstance;
-
- /* Create a main window for this application instance. */
-
- hWnd = CreateWindow(
- "GenericWClass", /* See RegisterClass() call */
- "Generic Sample Application", /* Text for window title bar */
- WS_OVERLAPPEDWINDOW, /* Window style */
- CW_USEDEFAULT, /* Default horizontal position */
- CW_USEDEFAULT, /* Default vertical position */
- CW_USEDEFAULT, /* Default width */
- CW_USEDEFAULT, /* Default height */
- NULL, /* Overlapped windows have no parent */
- NULL, /* Use the window class menu */
- hInstance, /* This instance owns this window */
- NULL /* Pointer not needed */
- );
-
- /* If window could not be created, return "failure" */
-
- if (!hWnd)
- return (FALSE);
-
- /* Make the window visible; update its client area; and return "success" */
-
- ShowWindow(hWnd, nCmdShow); /* Show the window */
- UpdateWindow(hWnd); /* Sends WM_PAINT message */
- return (TRUE); /* Returns the value from PostQuitMessage */
- }
-
- /****************************************************************************
-
- FUNCTION: MainWndProc(HWND, unsigned, WORD, LONG)
-
- PURPOSE: Processes messages
-
- MESSAGES:
-
- WM_COMMAND - application menu (About dialog box)
- WM_DESTROY - destroy window
-
- COMMENTS:
-
- To process the IDM_ABOUT message, call MakeProcInstance() to get the
- current instance address of the About() function. Then call Dialog
- box which will create the box according to the information in your
- generic.rc file and turn control over to the About() function. When
- it returns, free the intance address.
-
- ****************************************************************************/
-
- LONG FAR PASCAL MainWndProc(HWND hWnd, unsigned message, WORD wParam, LONG lParam)
- {
- FARPROC lpProcAbout; /* pointer to the "About" function */
-
- switch (message)
- {
- case WM_COMMAND: /* message: command from application menu */
- if (wParam == IDM_ABOUT)
- {
- lpProcAbout = MakeProcInstance(About, hInst);
-
- DialogBox(hInst, /* current instance */
- "AboutBox", /* resource to use */
- hWnd, /* parent handle */
- lpProcAbout); /* About() instance address */
-
- FreeProcInstance(lpProcAbout);
- break;
- }
- else /* Lets Windows process it */
- return (DefWindowProc(hWnd, message, wParam, lParam));
-
- case WM_DESTROY: /* message: window being destroyed */
- PostQuitMessage(0);
- break;
-
- default: /* Passes it on if unproccessed */
- return (DefWindowProc(hWnd, message, wParam, lParam));
- }
- return (NULL);
- }
-
-
- /****************************************************************************
-
- FUNCTION: About(HWND, unsigned, WORD, LONG)
-
- PURPOSE: Processes messages for "About" dialog box
-
- MESSAGES:
-
- WM_INITDIALOG - initialize dialog box
- WM_COMMAND - Input received
-
- COMMENTS:
-
- No initialization is needed for this particular dialog box, but TRUE
- must be returned to Windows.
-
- Wait for user to click on "Ok" button, then close the dialog box.
-
- ****************************************************************************/
-
- BOOL FAR PASCAL About(HWND hDlg, unsigned message, WORD wParam, LONG lParam)
- {
- switch (message)
- {
- case WM_INITDIALOG: /* message: initialize dialog box */
- return (TRUE);
-
- case WM_COMMAND: /* message: received a command */
- if (wParam == IDOK || wParam == IDCANCEL)
- {
- EndDialog(hDlg, TRUE); /* Exits the dialog box */
- return (TRUE);
- }
- break;
- }
- return (FALSE); /* Didn't process a message */
- }
-