屏幕保护程序的退出机制反映在程序的消息响应函数（Window’s Procedure）中，当按下键盘上任何一个健或者鼠标移动计数超过5次（防止桌面振动等因素导致的鼠标移动），程序进入退出机制，在sm_test或者sm--_full情况下查看屏幕保护程序是否设置密码，如果是，验证密码，正确，程序退出，错误，程序继续。当程序验证密码时，通过全局变量g_bCheckingSaverPassword告诉消息响应函数对屏幕刷新，以保证密码的输入。其他情况（sm_config, sm_preview）不用验证密码直接退出。这些功能包括在自定义的函数InterruptSaver( )和ShutdownSaver( )中。
上述各个函数的详细代码如下：
1、 CreateSaverWindow 函数：
HWND CreateSaverWindow(SaverMode mode, HWND hWndParent,HINSTANCE hInstance)
{
HWND hWnd;
RECT rc;
DWORD dwStyle;
hWnd=NULL;
switch ( mode )
{
case sm_preview:
GetClientRect(hWndParent, &rc );
dwStyle = WS_VISIBLE | WS_CHILD;
AdjustWindowRect( &rc, dwStyle, FALSE );
hWnd = CreateWindow( TEXT("SaverWndClass"), TEXT("SaverWindow"), dwStyle,
rc.left, rc.top, rc.right-rc.left, rc.bottom-rc.top,
hWndParent, NULL, hInstance, NULL);
break;
case sm_test:
rc.left = rc.top = 50;
rc.right = rc.left+600;
rc.bottom = rc.top+400;
dwStyle = WS_VISIBLE | WS_OVERLAPPED | WS_CAPTION | WS_MINIMIZEBOX | WS_SYSMENU;
AdjustWindowRect( &rc, dwStyle, FALSE );
hWnd = CreateWindow( TEXT("SaverWndClass"), TEXT("SaverWindow"), dwStyle,
rc.left, rc.top, rc.right-rc.left, rc.bottom-rc.top,
NULL, NULL, hInstance, NULL);
break;
case sm_full:
rc.left=rc.top=0;
rc.bottom=GetSystemMetrics(SM_CYSCREEN);
rc.right=GetSystemMetrics(SM_CXSCREEN);
dwStyle = WS_VISIBLE | WS_POPUP;
hWnd = CreateWindowEx( WS_EX_TOPMOST, TEXT("SaverWndClass"),
TEXT("SaverWindow"), dwStyle, rc.left, rc.top, rc.right - rc.left,
rc.bottom - rc.top, NULL, NULL, hInstance, NULL);
}
if(mode == sm_preview )
{
// 开始预览时，进入一个短暂的循环以使系统显示控制面板有足够的时间初始化
g_bWaitForInputIdle = TRUE;
// 开始循环
PostMessage( g_hWnd, WM_USER, 0, 0 );
MSG msg;
while( g_bWaitForInputIdle )
{
// 如果If 返回 FALSE, 结束循环
if( !GetMessage( &msg, g_hWnd, 0, 0 ) )
{
// 结束循环
PostQuitMessage(0);
break;
}
TranslateMessage( &msg);
DispatchMessage( &msg);
}
}
return hWnd;
} |
2、 Window消息响应函数：
LRESULT CALLBACK SaverProc( HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam )
{
switch ( uMsg )
{
case WM_USER:
//预览开始循环，500ms空闲时间用于控制面板的初始化。
SetTimer( hWnd, 1, 500, NULL );
break;
case WM_TIMER:
// 500ms时间到，预览循环结束。
g_bWaitForInputIdle = FALSE;
KillTimer( hWnd, 1 );
break;
case WM_DESTROY:
ShutdownSaver();
break;
case WM_SETCURSOR:
if ( g_SaverMode == sm_full && !g_bCheckingSaverPassword )
{
//隐藏鼠标指针
SetCursor( NULL );
return TRUE;
}
break;
case WM_PAINT:
{
PAINTSTRUCT ps;
BeginPaint( hWnd, &ps );
RECT rc;
GetClientRect(hWnd,&rc);
FillRect(ps.hdc, &rc, (HBRUSH)GetStockObject(BLACK_BRUSH) ); //黑屏
EndPaint( hWnd, &ps );
return 0;
}
case WM_ERASEBKGND:
// 输入密码时对屏幕刷新
if( !g_bCheckingSaverPassword )
return TRUE;
break;
case WM_MOUSEMOVE:
if( g_SaverMode != sm_test )
{
static INT xPrev = -1;
static INT yPrev = -1;
INT xCur = GET_X_LPARAM(lParam);
INT yCur = GET_Y_LPARAM(lParam);
if( xCur != xPrev || yCur != yPrev )
{
xPrev = xCur;
yPrev = yCur;
g_dwSaverMouseMoveCount++;
if ( g_dwSaverMouseMoveCount > 5 )
InterruptSaver();
}
}
break;
case WM_KEYDOWN:
case WM_LBUTTONDOWN:
case WM_RBUTTONDOWN:
case WM_MBUTTONDOWN:
if( g_SaverMode != sm_test )
InterruptSaver();
break;
case WM_ACTIVATEAPP:
if( wParam == FALSE && g_SaverMode != sm_test )
InterruptSaver();
break;
case WM_POWERBROADCAST:
if( wParam == PBT_APMSUSPEND && g_VerifySaverPassword == NULL )
InterruptSaver();
break;
case WM_SYSCOMMAND:
if ( g_SaverMode == sm_full )
{
switch ( wParam )
{
case SC_NEXTWINDOW:
case SC_PREVWINDOW:
case SC_SCREENSAVE:
case SC_CLOSE:
return FALSE;
};
}
break;
}
return DefWindowProc( hWnd, uMsg, wParam, lParam );
} |
3、 ChangePassword()函数
VOID ChangePassword()
{
// 载入密码更改函数动态链接库（Dynamic Linked Library）
HINSTANCE mpr = LoadLibrary( TEXT("MPR.DLL") );
if ( mpr != NULL )
{
// 从动态链接数据库中提取密码设置函数
typedef DWORD (PASCAL *PWCHGPROC)( LPCSTR, HWND, DWORD, LPVOID );
PWCHGPROC pwd = (PWCHGPROC)GetProcAddress( mpr, "PwdChangePasswordA" );
//运行密码设置函数
if ( pwd != NULL )
pwd( "SCRSAVE", g_hWndParent, 0, NULL );
//释放动态链接库
FreeLibrary( mpr );
}
} |
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