reactos/modules/rosapps/applications/screensavers/matrix/screensave.c
2019-01-20 09:04:58 +01:00

161 lines
3.8 KiB
C

//
// screensave.c
//
// Entrypoint for a win32 screensaver
//
// NOTES: Screen savers don't like being UPX'd (compressed). Don't
// know why, it just is. C-runtime has been stripped with
// "libctiny.lib".
//
// v1.0 1/12/2003 J Brown
//
#include <windows.h>
#include <windowsx.h>
#include <tchar.h>
#include "globals.h"
#include "message.h"
#include "matrix.h"
#include "resource.h"
//#pragma comment(lib, "libctiny.lib")
//#pragma comment(linker, "/OPT:NOWIN98")
//
// Added: Multimonitor support!!
//
HMONITOR (WINAPI * pfnEnumDisplayMonitors)(HDC, LPCRECT, MONITORENUMPROC, LPARAM);
BOOL (WINAPI * pfnGetMonitorInfo)(HMONITOR, LPMONITORINFO);
//
// Callback function for EnumDisplayMonitors API. Use this function
// to kickstart a screen-saver window for each monitor in the system
//
BOOL CALLBACK MonitorEnumProc(HMONITOR hMonitor, HDC hdcMonitor, RECT *rcMonitor, LPARAM Param)
{
HWND hwnd;
// Create a screensaver on this monitor!
hwnd = CreateScreenSaveWnd((HWND)Param, rcMonitor);
// For some reason windows always places this window at 0,0...
// position it ourselves
SetWindowPos(hwnd, 0, rcMonitor->left, rcMonitor->top, 0, 0,
SWP_NOZORDER|SWP_NOACTIVATE|SWP_NOSIZE|SWP_SHOWWINDOW);
return TRUE;
}
//
// Start screen saver!
//
BOOL ScreenSaver(HWND hwndParent)
{
HMODULE hUser32;
UINT nPreviousState;
MSG msg;
InitScreenSaveClass(hwndParent);
SystemParametersInfo(SPI_SETSCREENSAVERRUNNING, TRUE, &nPreviousState, 0);
// Dynamically locate API call from USER32 - not present in all versions
hUser32 = GetModuleHandle(_T("USER32.DLL"));
pfnEnumDisplayMonitors = (PVOID)GetProcAddress(hUser32, "EnumDisplayMonitors");
// If we're running Win2k+ then the API is available...so call it!
if(pfnEnumDisplayMonitors && hwndParent == 0)
{
pfnEnumDisplayMonitors(NULL, NULL, MonitorEnumProc, 0);
}
// Otherwise simulate by calling enum-proc manually
else
{
RECT rect;
rect.left = 0;
rect.right = GetSystemMetrics(SM_CXSCREEN);
rect.top = 0;
rect.bottom = GetSystemMetrics(SM_CYSCREEN);
MonitorEnumProc(NULL, NULL, &rect, (LPARAM)hwndParent);
}
// run message loop to handle all screen-saver windows
while(GetMessage(&msg, NULL,0,0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
SystemParametersInfo(SPI_SETSCREENSAVERRUNNING, FALSE, &nPreviousState, 0);
return TRUE;
}
//
// Look for any options Windows has passed to us:
//
// -a <hwnd> (set password)
// -s (screensave)
// -p <hwnd> (preview)
// -c <hwnd> (configure)
//
VOID ParseCommandLine(LPWSTR szCmdLine, UCHAR *chOption, HWND *hwndParent)
{
UCHAR ch = *szCmdLine++;
if(ch == '-' || ch == '/')
ch = *szCmdLine++;
if(ch >= 'A' && ch <= 'Z')
ch += 'a' - 'A'; //convert to lower case
*chOption = ch;
ch = *szCmdLine++;
if(ch == ':')
ch = *szCmdLine++;
while(ch == ' ' || ch == '\t')
ch = *szCmdLine++;
if(isdigit(ch))
{
ULONG_PTR i = _wtoi(szCmdLine - 1);
*hwndParent = (HWND)i;
}
else
*hwndParent = NULL;
}
//
// Entrypoint for screen-saver: it's just a normal win32 app!
//
int CALLBACK wWinMain (HINSTANCE hInst, HINSTANCE hPrev, LPWSTR lpCmdLine, int iCmdShow)
{
HWND hwndParent;
UCHAR chOption;
// Make sure that only 1 instance runs at a time -
// Win98 seems to want us to restart every 5 seconds!!
if(FindWindowEx(NULL, NULL, APPNAME, APPNAME))
{
return 0;
}
LoadSettings();
ParseCommandLine(lpCmdLine, &chOption, &hwndParent);
switch(chOption)
{
case 's': return ScreenSaver(NULL); // screen save
case 'p': return ScreenSaver(hwndParent); // preview in small window
case 'a': return ChangePassword(hwndParent); // ask for password
case 'c': return Configure(hwndParent); // configuration dialog
default: return Configure(hwndParent); // configuration dialog
}
return 0;
}