410 lines
10 KiB
C
410 lines
10 KiB
C
/*
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Screen saver library by Anders Norlander <anorland@hem2.passagen.se>
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This library is (hopefully) compatible with Microsoft's
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screen saver library.
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This is public domain software.
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*/
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#include <windows.h>
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#include <scrnsave.h>
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#include <regstr.h>
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/* screen saver window class */
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#define CLASS_SCRNSAVE TEXT("WindowsScreenSaverClass")
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/* globals */
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HWND hMainWindow = NULL;
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BOOL fChildPreview = FALSE;
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HINSTANCE hMainInstance;
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TCHAR szName[TITLEBARNAMELEN];
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TCHAR szAppName[APPNAMEBUFFERLEN];
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TCHAR szIniFile[MAXFILELEN];
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TCHAR szScreenSaver[22];
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TCHAR szHelpFile[MAXFILELEN];
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TCHAR szNoHelpMemory[BUFFLEN];
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UINT MyHelpMessage;
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/* local house keeping */
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static HINSTANCE hPwdLib = NULL;
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static POINT pt_orig;
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static BOOL checking_pwd = FALSE;
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static BOOL closing = FALSE;
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static BOOL w95 = FALSE;
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typedef BOOL (WINAPI *VERIFYPWDPROC)(HWND);
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typedef DWORD (WINAPI *CHPWDPROC)(LPCTSTR, HWND, DWORD, PVOID);
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static VERIFYPWDPROC VerifyScreenSavePwd = NULL;
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/* function names */
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#define szVerifyPassword "VerifyScreenSavePwd"
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#ifdef UNICODE
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#define szPwdChangePassword "PwdChangePasswordW"
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#else
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#define szPwdChangePassword "PwdChangePasswordA"
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#endif
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static void TerminateScreenSaver(HWND hWnd);
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static BOOL RegisterClasses(void);
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static LRESULT WINAPI SysScreenSaverProc(HWND,UINT,WPARAM,LPARAM);
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static int LaunchScreenSaver(HWND hParent);
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static void LaunchConfig(void);
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static int ISSPACE(char c)
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{
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return (c == ' ' || c == '\t');
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}
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#define ISNUM(c) ((c) >= '0' && c <= '9')
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static unsigned long
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_toul(const char *s)
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{
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unsigned long res;
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unsigned long n;
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const char *p;
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for (p = s; *p; p++)
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if (!ISNUM(*p)) break;
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p--;
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res = 0;
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for (n = 1; p >= s; p--, n *= 10)
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res += (*p - '0') * n;
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return res;
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}
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/* screen saver entry point */
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int APIENTRY WinMain(HINSTANCE hInst, HINSTANCE hPrevInst,
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LPSTR CmdLine, int nCmdShow)
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{
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LPSTR p;
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OSVERSIONINFO vi;
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/* initialize */
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hMainInstance = hInst;
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vi.dwOSVersionInfoSize = sizeof(vi);
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GetVersionEx(&vi);
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/* check if we are going to check for passwords */
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if (vi.dwPlatformId == VER_PLATFORM_WIN32_WINDOWS)
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{
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HKEY hKey;
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/* we are using windows 95 */
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w95 = TRUE;
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if (RegOpenKey(HKEY_CURRENT_USER, REGSTR_PATH_SCREENSAVE ,&hKey) ==
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ERROR_SUCCESS)
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{
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DWORD check_pwd;
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DWORD size = sizeof(DWORD);
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DWORD type;
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LONG res;
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res = RegQueryValueEx(hKey, REGSTR_VALUE_USESCRPASSWORD,
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NULL, &type, (PBYTE) &check_pwd, &size);
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if (check_pwd && res == ERROR_SUCCESS)
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{
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hPwdLib = LoadLibrary(TEXT("PASSWORD.CPL"));
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if (hPwdLib)
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VerifyScreenSavePwd = GetProcAddress(hPwdLib, szVerifyPassword);
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}
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RegCloseKey(hKey);
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}
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}
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/* parse arguments */
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for (p = CmdLine; *p; p++)
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{
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switch (*p)
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{
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case 'S':
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case 's':
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/* start screen saver */
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return LaunchScreenSaver(NULL);
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case 'P':
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case 'p':
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{
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/* start screen saver in preview window */
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HWND hParent;
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fChildPreview = TRUE;
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while (ISSPACE(*++p));
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hParent = (HWND) _toul(p);
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if (hParent && IsWindow(hParent))
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return LaunchScreenSaver(hParent);
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}
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return 0;
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case 'C':
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case 'c':
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/* display configure dialog */
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LaunchConfig();
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return 0;
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case 'A':
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case 'a':
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{
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/* change screen saver password */
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HWND hParent;
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while (ISSPACE(*++p));
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hParent = (HWND) _toul(p);
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if (!hParent || !IsWindow(hParent))
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hParent = GetForegroundWindow();
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ScreenSaverChangePassword(hParent);
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}
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return 0;
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case '-':
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case '/':
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case ' ':
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default:
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break;
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}
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}
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LaunchConfig();
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return 0;
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}
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static void LaunchConfig(void)
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{
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/* FIXME: should this be called */
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RegisterDialogClasses(hMainInstance);
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/* display configure dialog */
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DialogBox(hMainInstance, MAKEINTRESOURCE(DLG_SCRNSAVECONFIGURE),
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GetForegroundWindow(), (DLGPROC) ScreenSaverConfigureDialog);
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}
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static int LaunchScreenSaver(HWND hParent)
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{
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BOOL foo;
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UINT style;
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RECT rc;
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MSG msg;
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/* don't allow other tasks to get into the foreground */
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if (w95 && !fChildPreview)
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SystemParametersInfo(SPI_SETSCREENSAVERRUNNING, TRUE, &foo, 0);
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msg.wParam = 0;
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/* register classes, both user defined and classes used by screen saver
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library */
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if (!RegisterClasses())
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{
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MessageBox(NULL, TEXT("RegisterClasses() failed"), NULL, MB_ICONHAND);
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goto restore;
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}
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/* a slightly different approach needs to be used when displaying
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in a preview window */
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if (hParent)
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{
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style = WS_CHILD;
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GetClientRect(hParent, &rc);
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}
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else
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{
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style = WS_POPUP;
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rc.left = GetSystemMetrics(SM_XVIRTUALSCREEN);
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rc.top = GetSystemMetrics(SM_YVIRTUALSCREEN);
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rc.right = GetSystemMetrics(SM_CXVIRTUALSCREEN);
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rc.bottom = GetSystemMetrics(SM_CYVIRTUALSCREEN);
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style |= WS_VISIBLE;
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}
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/* create main screen saver window */
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hMainWindow = CreateWindowEx(hParent ? 0 : WS_EX_TOPMOST, CLASS_SCRNSAVE,
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TEXT("SCREENSAVER"), style,
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rc.left, rc.top, rc.right, rc.bottom, hParent, NULL,
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hMainInstance, NULL);
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/* display window and start pumping messages */
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if (hMainWindow)
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{
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UpdateWindow(hMainWindow);
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ShowWindow(hMainWindow, SW_SHOW);
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while (GetMessage(&msg, NULL, 0, 0) == TRUE)
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{
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TranslateMessage(&msg);
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DispatchMessage(&msg);
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}
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}
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restore:
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/* restore system */
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if (w95 && !fChildPreview)
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SystemParametersInfo(SPI_SETSCREENSAVERRUNNING, FALSE, &foo, 0);
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FreeLibrary(hPwdLib);
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return msg.wParam;
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}
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/* this function takes care of *must* do tasks, like terminating
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screen saver */
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static LRESULT WINAPI SysScreenSaverProc(HWND hWnd, UINT msg,
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WPARAM wParam, LPARAM lParam)
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{
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switch (msg)
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{
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case WM_CREATE:
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if (!fChildPreview)
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SetCursor(NULL);
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/* mouse is not supposed to move from this position */
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GetCursorPos(&pt_orig);
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break;
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case WM_DESTROY:
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PostQuitMessage(0);
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break;
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case WM_TIMER:
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if (closing)
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return 0;
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break;
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case WM_PAINT:
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if (closing)
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return DefWindowProc(hWnd, msg, wParam, lParam);
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break;
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case WM_SYSCOMMAND:
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if (!fChildPreview)
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switch (wParam)
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{
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case SC_CLOSE:
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case SC_SCREENSAVE:
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case SC_NEXTWINDOW:
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case SC_PREVWINDOW:
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return FALSE;
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}
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break;
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case WM_MOUSEMOVE:
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case WM_LBUTTONDOWN:
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case WM_RBUTTONDOWN:
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case WM_MBUTTONDOWN:
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case WM_KEYDOWN:
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case WM_SYSKEYDOWN:
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case WM_NCACTIVATE:
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case WM_ACTIVATE:
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case WM_ACTIVATEAPP:
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if (closing)
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return DefWindowProc(hWnd, msg, wParam, lParam);
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break;
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}
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return ScreenSaverProc(hWnd, msg, wParam, lParam);
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}
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LONG WINAPI DefScreenSaverProc(HWND hWnd, UINT msg,
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WPARAM wParam, LPARAM lParam)
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{
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/* don't do any special processing when in preview mode */
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if (fChildPreview || closing)
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return DefWindowProc(hWnd, msg, wParam, lParam);
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switch (msg)
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{
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case WM_CLOSE:
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TerminateScreenSaver(hWnd);
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/* do NOT pass this to DefWindowProc; it will terminate even if
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an invalid password was given.
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*/
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return 0;
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case SCRM_VERIFYPW:
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/* verify password or return TRUE if password checking is turned off */
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if (VerifyScreenSavePwd)
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return VerifyScreenSavePwd(hWnd);
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else
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return TRUE;
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case WM_SETCURSOR:
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if (checking_pwd)
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break;
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SetCursor(NULL);
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return TRUE;
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case WM_NCACTIVATE:
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case WM_ACTIVATE:
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case WM_ACTIVATEAPP:
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if (wParam != FALSE)
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break;
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case WM_MOUSEMOVE:
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{
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POINT pt;
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GetCursorPos(&pt);
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if (pt.x == pt_orig.x && pt.y == pt_orig.y)
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break;
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}
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case WM_LBUTTONDOWN:
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case WM_RBUTTONDOWN:
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case WM_MBUTTONDOWN:
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case WM_KEYDOWN:
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case WM_SYSKEYDOWN:
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/* try to terminate screen saver */
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if (!checking_pwd)
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PostMessage(hWnd, WM_CLOSE, 0, 0);
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break;
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}
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return DefWindowProc(hWnd, msg, wParam, lParam);
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}
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static void TerminateScreenSaver(HWND hWnd)
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{
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/* don't allow recursion */
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if (checking_pwd || closing)
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return;
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/* verify password */
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if (VerifyScreenSavePwd)
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{
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checking_pwd = TRUE;
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closing = SendMessage(hWnd, SCRM_VERIFYPW, 0, 0);
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checking_pwd = FALSE;
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}
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else
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closing = TRUE;
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/* are we closing? */
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if (closing)
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{
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DestroyWindow(hWnd);
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}
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else
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GetCursorPos(&pt_orig); /* if not: get new mouse position */
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}
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/*
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Register screen saver window class and call user
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supplied hook.
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*/
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static BOOL RegisterClasses(void)
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{
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WNDCLASS cls;
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cls.hCursor = NULL;
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cls.hIcon = LoadIcon(hMainInstance, MAKEINTATOM(ID_APP));
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cls.lpszMenuName = NULL;
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cls.lpszClassName = CLASS_SCRNSAVE;
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cls.hbrBackground = GetStockObject(BLACK_BRUSH);
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cls.hInstance = hMainInstance;
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cls.style = CS_VREDRAW | CS_HREDRAW | CS_SAVEBITS | CS_PARENTDC;
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cls.lpfnWndProc = (WNDPROC) SysScreenSaverProc;
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cls.cbWndExtra = 0;
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cls.cbClsExtra = 0;
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if (!RegisterClass(&cls))
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return FALSE;
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return RegisterDialogClasses(hMainInstance);
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}
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void WINAPI ScreenSaverChangePassword(HWND hParent)
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{
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/* load Master Password Router (MPR) */
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HINSTANCE hMpr = LoadLibrary(TEXT("MPR.DLL"));
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if (hMpr)
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{
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CHPWDPROC ChangePassword;
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ChangePassword = (CHPWDPROC) GetProcAddress(hMpr, szPwdChangePassword);
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/* change password for screen saver provider */
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if (ChangePassword)
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ChangePassword(TEXT("SCRSAVE"), hParent, 0, NULL);
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FreeLibrary(hMpr);
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}
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}
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