logon.c File Reference

#include <stdlib.h>
#include <windef.h>
#include <winbase.h>
#include <wingdi.h>
#include <winuser.h>
#include <scrnsave.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	APP_TIMER   1
#define	APP_TIMER_INTERVAL   10000

Functions
static HBITMAP	GetScreenSaverBitmap (VOID)
LRESULT CALLBACK	ScreenSaverProc (HWND hWnd, UINT uMsg, 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 32 of file logon.c.

APP_TIMER_INTERVAL

#define APP_TIMER_INTERVAL   10000

Definition at line 33 of file logon.c.

RANDOM

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

Definition at line 30 of file logon.c.

Function Documentation

GetScreenSaverBitmap()

static HBITMAP GetScreenSaverBitmap ( VOID  )

static

Definition at line 37 of file logon.c.

{
    OSVERSIONINFOEX osvi = {0};
    osvi.dwOSVersionInfoSize = sizeof(osvi);
    GetVersionEx((POSVERSIONINFO)&osvi);
 
    return LoadImageW(GetModuleHandle(NULL),
                      osvi.wProductType == VER_NT_WORKSTATION ?
                          MAKEINTRESOURCEW(IDB_WORKSTATION) : MAKEINTRESOURCEW(IDB_SERVER),
                      IMAGE_BITMAP, 0, 0, LR_CREATEDIBSECTION);
}

Referenced by ScreenSaverProc().

RegisterDialogClasses()

BOOL WINAPI RegisterDialogClasses

(

HANDLE

hInst

)

Definition at line 140 of file logon.c.

{
    WCHAR szMessage[256];
    WCHAR szTitle[25];
 
    LoadStringW(hInst, IDS_TEXT, szMessage, _countof(szMessage));
    LoadStringW(hInst, IDS_DESCRIPTION, szTitle, _countof(szTitle));
 
    MessageBoxW(NULL, szMessage, szTitle, MB_OK | MB_ICONEXCLAMATION);
 
    return FALSE;
}

ScreenSaverConfigureDialog()

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

Definition at line 130 of file logon.c.

{
    return FALSE;
}

ScreenSaverProc()

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

Definition at line 51 of file logon.c.

{
    static HBITMAP bitmap;
 
    switch (uMsg)
    {
        case WM_CREATE:
        {
            bitmap = GetScreenSaverBitmap();
            if (bitmap == NULL)
            {
                /* Extremely unlikely, message not localized. */
                MessageBoxW(hWnd,
                            L"Fatal Error: Could not load bitmap",
                            L"Error",
                            MB_OK | MB_ICONEXCLAMATION);
            }
 
            SetTimer(hWnd, APP_TIMER, APP_TIMER_INTERVAL, NULL);
            break;
        }
        case WM_PAINT:
        {
            BITMAP bm;
            PAINTSTRUCT ps;
            HDC hdc;
            HDC hdcMem;
            HBITMAP hbmOld;
            RECT rect;
 
            hdc = BeginPaint(hWnd, &ps);
            hdcMem = CreateCompatibleDC(hdc);
            hbmOld = SelectObject(hdcMem, bitmap);
            GetObjectW(bitmap, sizeof(bm), &bm);
 
            GetClientRect(hWnd, &rect);
            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, TRUE);
            break;
        }
        case WM_DESTROY:
        {
            KillTimer(hWnd, APP_TIMER);
            DeleteObject(bitmap);
            PostQuitMessage(0);
            break;
        }
        default:
        {
            /* Pass window messages to the default screensaver window procedure */
            return DefScreenSaverProc(hWnd, uMsg, wParam, lParam);
        }
    }
 
    return 0;
}