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PsL Monthly 1994 February
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NEKOSAVR.CMD
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OS/2 REXX Batch file
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1993-11-04
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5KB
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154 lines
EXTPROC CENVI
/********************************
*** NekoSavr.cmd - blah blah ***
********************************/
main(argc,argv)
{
// test that the input looks valid
if ( argc != 2
|| !isdigit(argv[1][0])
|| (QuietInterval = atoi(argv[1])) < 1 )
ShowInstructions();
else {
// kill the resident Neko screen saver it it;s already running
system("kill \"%s\"",WindowTitle);
suspend(2000);
// install the resident version of this program
system("start \"%s\" /N /B /WIN /MIN CEnvi #include '%s,,,/*RESIDENT*/' Forever(%d)",
WindowTitle,argv[0],60 * QuietInterval);
// hide the resident version of this program
suspend(5000);
system("WinSet \"%s\" HIDE",WindowTitle);
printf("Cat & Mouse games will begin after %d minutes of keyboard and\n"
"mouse inactivity.\n",QuietInterval);
}
}
ShowInstructions()
{
printf("\a\n");
printf("NekoSavr.cmd - Cat & Mouse Screen Saver. Run NEKO.EXE if there is no\n");
printf(" keyboard keys or mouse keys pressed. End NEKO.EXE when\n");
printf(" keys pressed again.\n");
printf("\n");
printf("SYNTAX: NekoSavr Interval\n");
printf("\n");
printf("Where: Interval - How many minutes of no keyboard or mouse-button activity\n");
printf(" before the Cat & Mouse screen saver begins\n");
printf("\n");
printf("Example: NekoSavr 5 - Start neko after 5 minutes of inactivity\n");
printf(" NekoSavr 1 - Start neko after 1 minute of inactivity\n");
printf("\n");
}
/*RESIDENT*/
// All code below this is part of the resident program
#include <KeyPush.lib>
WindowTitle = "Neko Screen Saver";
#define START_WAIT_INTERVAL 4000 // set for how often to check the table for changes
// in milliseconds while waiting to start screen saver
#define END_WAIT_INTERVAL 750 // interval to wait while waiting to end screen saver
#define KEYBOARD_TABLE_SIZE 256
Forever(QuietInterval)
// wait until QuietInterval seconds has elapsed with no apparent keyboard
// activity.
{
while(TRUE) {
WaitForInactivity(QuietInterval); // wait for period of inactivity
StartProgram(); // start program, and get handle
WaitForActivity(); // wait for a keyboard or mouse press
EndProgram();
}
}
WaitForInactivity(QuietInterval) // check every once in a while, and return after a
{ // long period of inactivity
// check at every interval and set keyboard if it is not already set
PrevTable = GetGlobalKeyboardTable();
PrevPos = PointerPosition();
EndTime = time() + QuietInterval;
// stay in this block until period of inactivity has occurred
do {
suspend(START_WAIT_INTERVAL); // wait a while
CurrentTable = GetGlobalKeyboardTable();
CurrentPos = PointerPosition();
if ( memcmp(CurrentTable,PrevTable,KEYBOARD_TABLE_SIZE)
|| CurrentPos != PrevPos ) {
// table has changed; reset EndTime and remember table
EndTime = time() + QuietInterval;
PrevTable = CurrentTable;
PrevPos = CurrentPos;
}
} while ( time() < EndTime );
}
WaitForActivity() // check every once in a while, and return after a
{ // change in the keyboard or mouse
PreviousTable = GetGlobalKeyboardTable();
PrevPos = PointerPosition();
while( !memcmp(PreviousTable,GetGlobalKeyboardTable(),KEYBOARD_TABLE_SIZE)
&& PrevPos == PointerPosition() ) {
printf("\nwaiting for change");
suspend(END_WAIT_INTERVAL);
}
}
StartProgram()
{
// start NEKO running
system("start /B /PM NEKO.EXE");
suspend(3000);
// pass keystrokes to NEKO to make desktop go away
KeyStroke(VK_ENTER);
suspend(5000);
KeyStroke(VK_ENTER);
suspend(1500);
}
EndProgram()
{
KeyStroke(VK_ALT);
KeyStroke(VK_ALT,VK_F4);
}
ForceRandomChange = 0; // if can't read table then pretend that it has changed
GetGlobalKeyboardTable()
{
#define HWND_DESKTOP 1
#define ORD_WIN32SETKEYBOARDSTATETABLE 921
KeyTable[KEYBOARD_TABLE_SIZE-1] = '\0'; // pre-allocate a 256 byte buffer
if !DynamicLink("PMWIN",ORD_WIN32SETKEYBOARDSTATETABLE,BIT32,CDECL,
HWND_DESKTOP,KeyTable,FALSE) {
// could not read global key table, and so pretend it has changed
KeyTable[0] = (ForceRandomChange ^= 1);
}
return(KeyTable);
}
PointerPosition() // return current cursor position in screen coordinates
{ // structure elements returned are .col and .row
#define ORD_WIN32QUERYPOINTERPOS 823
BLObSize(pointer,4 * 2);
DynamicLink("PMWIN",ORD_WIN32QUERYPOINTERPOS,BIT32,CDECL,
HWND_DESKTOP,pointer);
position.col = BLObGet(pointer,0,SWORD16);
position.row = BLObGet(pointer,4,SWORD16);
return(position);
}