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Microsoft Windows NT Pre-Release 11-19-1991

/****************************************************************************

    PROGRAM: Icon.c

    PURPOSE: Demonstrates using an icon for the About box and minimize box

    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

****************************************************************************/

#include "windows.h"
#include "icon.h"

HANDLE hInst;


/****************************************************************************

    FUNCTION: WinMain(HANDLE, HANDLE, LPSTR, int)

    PURPOSE: calls initialization function, processes message loop

****************************************************************************/

int APIENTRY WinMain(
    HANDLE hInstance,
    HANDLE hPrevInstance,
    LPSTR lpCmdLine,
    int nCmdShow
    )
{
    MSG msg;

    UNREFERENCED_PARAMETER( lpCmdLine );

    if (!hPrevInstance)
	if (!InitApplication(hInstance))
	    return (FALSE);

    if (!InitInstance(hInstance, nCmdShow))
        return (FALSE);

    while (GetMessage(&msg, NULL, NULL, NULL)) {
	TranslateMessage(&msg);
	DispatchMessage(&msg);
    }
    return (msg.wParam);
}


/****************************************************************************

    FUNCTION: InitApplication(HANDLE)

    PURPOSE: Initializes window data and registers window class

****************************************************************************/

BOOL InitApplication(HANDLE hInstance)
{
    WNDCLASS  wc;

    wc.style = NULL;
    wc.lpfnWndProc = (WNDPROC) MainWndProc;
    wc.cbClsExtra = 0;
    wc.cbWndExtra = 0;
    wc.hInstance = hInstance;
    wc.hIcon = LoadIcon(hInstance, "MyIcon");           /* loads icon */
    wc.hCursor = LoadCursor(NULL, IDC_ARROW);
    wc.hbrBackground = GetStockObject(WHITE_BRUSH); 
    wc.lpszMenuName =  "IconMenu";
    wc.lpszClassName = "IconWClass";

    return (RegisterClass(&wc));
}


/****************************************************************************

    FUNCTION:  InitInstance(HANDLE, int)

    PURPOSE:  Saves instance handle and creates main window

****************************************************************************/

BOOL InitInstance(
    HANDLE          hInstance,
    INT             nCmdShow)
{
    HWND            hWnd;

    hInst = hInstance;

    hWnd = CreateWindow(
        "IconWClass",
        "Icon Sample Application",
        WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT,
        CW_USEDEFAULT,
        CW_USEDEFAULT,
        CW_USEDEFAULT,
        NULL,
        NULL,
        hInstance,
        NULL
    );

    if (!hWnd)
        return (FALSE);

    ShowWindow(hWnd, nCmdShow);
    UpdateWindow(hWnd);
    return (TRUE);

}

/****************************************************************************

    FUNCTION: MainWndProc(HWND, unsigned, WORD, LONG)

    PURPOSE:  Processes messages

    MESSAGES:

	WM_COMMAND    - application menu (About dialog box)
	WM_DESTROY    - destroy window

****************************************************************************/

LONG APIENTRY MainWndProc(
	HWND hWnd,
	UINT message,
	UINT wParam,
	LONG lParam)
{
    FARPROC lpProcAbout;

    switch (message) {
	case WM_COMMAND:
	    if (LOWORD(wParam) == IDM_ABOUT) {
		lpProcAbout = MakeProcInstance((FARPROC)About, hInst);

		DialogBox(hInst,
		    "AboutBox",
		    hWnd,
		    (WNDPROC)lpProcAbout);

		FreeProcInstance(lpProcAbout);
		break;
	    }
	    else
		return (DefWindowProc(hWnd, message, wParam, lParam));

	case WM_DESTROY:
	    PostQuitMessage(0);
	    break;

	default:
	    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

****************************************************************************/

BOOL APIENTRY About(
	HWND hDlg,
	UINT message,
	UINT wParam,
	LONG lParam)
{
    switch (message) {
	case WM_INITDIALOG:
	    return (TRUE);

	case WM_COMMAND:
	    if (LOWORD(wParam) == IDOK
		|| LOWORD(wParam) == IDCANCEL) {
		EndDialog(hDlg, TRUE);
		return (TRUE);
	    }
	    break;
    }
    return (FALSE);
	UNREFERENCED_PARAMETER(lParam);
}

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