logon.c File Reference

#include <stdarg.h>
#include <windef.h>
#include <winbase.h>
#include <wingdi.h>
#include <winuser.h>
#include <scrnsave.h>
#include <stdlib.h>
#include <tchar.h>
#include "resource.h"

Include dependency graph for logon.c:

Go to the source code of this file.

Macros
#define	RANDOM(min, max)   ((rand() % (int)(((max)+1) - (min))) + (min))
#define	APPNAME   _T("Logon")
#define	APP_TIMER   1
#define	APP_TIMER_INTERVAL   2000

Functions
HBITMAP	GetScreenSaverBitmap (VOID)
LRESULT CALLBACK	ScreenSaverProc (HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
BOOL WINAPI	ScreenSaverConfigureDialog (HWND hDlg, UINT uMsg, WPARAM wParam, LPARAM lParam)
BOOL WINAPI	RegisterDialogClasses (HANDLE hInst)

Macro Definition Documentation

APP_TIMER

#define APP_TIMER   1

Definition at line 35 of file logon.c.

APP_TIMER_INTERVAL

#define APP_TIMER_INTERVAL   2000

Definition at line 36 of file logon.c.

APPNAME

#define APPNAME   _T("Logon")

Definition at line 34 of file logon.c.

RANDOM

#define RANDOM	(		min,
			max
	)		((rand() % (int)(((max)+1) - (min))) + (min))

Definition at line 32 of file logon.c.

Function Documentation

GetScreenSaverBitmap()

HBITMAP GetScreenSaverBitmap

(

VOID

)

Definition at line 39 of file logon.c.

{
    OSVERSIONINFOEX osvi;
 
    ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
    osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
    GetVersionEx ((OSVERSIONINFO *) &osvi);
 
    switch(osvi.wProductType)
    {
        case VER_NT_WORKSTATION:
            return LoadImage(GetModuleHandle(NULL), MAKEINTRESOURCE(IDB_WORKSTATION), IMAGE_BITMAP, 0, 0, LR_CREATEDIBSECTION);
            break;
        default:
            return LoadImage(GetModuleHandle(NULL), MAKEINTRESOURCE(IDB_SERVER), IMAGE_BITMAP, 0, 0, LR_CREATEDIBSECTION);
            break;
    }
}

Referenced by ScreenSaverProc().

RegisterDialogClasses()

BOOL WINAPI RegisterDialogClasses

(

HANDLE

hInst

)

Definition at line 170 of file logon.c.

{
    TCHAR szMessage[256];
    TCHAR szTitle[25];
 
    LoadString(hInst, IDS_TEXT, szMessage, sizeof(szMessage) / sizeof(TCHAR));
    LoadString(hInst, IDS_DESCRIPTION, szTitle, sizeof(szTitle) / sizeof(TCHAR));
 
    MessageBox(NULL, szMessage, szTitle, MB_OK | MB_ICONEXCLAMATION);
 
    return FALSE;
}

ScreenSaverConfigureDialog()

BOOL WINAPI ScreenSaverConfigureDialog	(	HWND	hDlg,
		UINT	uMsg,
		WPARAM	wParam,
		LPARAM	lParam
	)

Definition at line 161 of file logon.c.

{
    return FALSE;
}

ScreenSaverProc()

LRESULT CALLBACK ScreenSaverProc	(	HWND	hWnd,
		UINT	message,
		WPARAM	wParam,
		LPARAM	lParam
	)

Definition at line 60 of file logon.c.

{
    static RECT rect;
    static HBITMAP bitmap;
 
    switch (message)
    {
        case WM_CREATE:
        {
            bitmap = GetScreenSaverBitmap ();
            if (bitmap == NULL)
            {
                MessageBox(hWnd,
                           _T("Fatal Error: Could not load bitmap"),
                           _T("Error"),
                           MB_OK | MB_ICONEXCLAMATION);
            }
 
            SetTimer(hWnd,
                     APP_TIMER,
                     APP_TIMER_INTERVAL,
                     NULL);
 
             break;
        }
        case WM_PAINT:
        {
             BITMAP bm; /* Bitmap structure as seen in bmWidth & bmHeight */
             PAINTSTRUCT ps;
             HDC hdc;
             HDC hdcMem;
             HBITMAP hbmOld;
 
             // Obtain window coordinates.
             GetClientRect (hWnd, &rect);
 
             hdc = BeginPaint(hWnd, &ps);
             hdcMem = CreateCompatibleDC(hdc);
             hbmOld = SelectObject(hdcMem, bitmap);
 
             GetObject(bitmap, sizeof(bm), &bm);
 
             if (rect.right < bm.bmWidth ||
                 rect.bottom < bm.bmHeight)
             {
                StretchBlt(
                    hdc,
                    RANDOM (0, rect.right - (bm.bmWidth /5)),
                    RANDOM (0, rect.bottom - (bm.bmHeight /5)),
                    bm.bmWidth /5,
                    bm.bmHeight /5,
                    hdcMem,
                    0,
                    0,
                    bm.bmWidth,
                    bm.bmHeight,
                    SRCCOPY);
             }
             else
             {
                 BitBlt(
                     hdc,
                     RANDOM (0, rect.right - bm.bmWidth),
                     RANDOM (0, rect.bottom - bm.bmHeight),
                     bm.bmWidth,
                     bm.bmHeight,
                     hdcMem,
                     0,
                     0,
                     SRCCOPY);
             }
 
             SelectObject(hdcMem, hbmOld);
             DeleteDC(hdcMem);
 
             EndPaint(hWnd, &ps);
             break;
        }
        case WM_TIMER:
        {
          InvalidateRect(hWnd, NULL, 1);
          break;
        }
        case WM_DESTROY:
        {
            KillTimer(hWnd, APP_TIMER);
            DeleteObject(bitmap);
            PostQuitMessage(0);
            break;
        }
 
        default:
            // Pass Windows Messages to the default screensaver window procedure
            return DefScreenSaverProc(hWnd, message, wParam, lParam);
    }
 
    return 0;
}