www.pudn.com > PocketC.zip > atexit.c

// atexit 
// This is an example of using the atexit() function to save the applet 
// state when the user switches apps 
int x1, x2, y1, y2; 
 
savestuff() { 
  if (dbcreate("atexitSaveDB")) { 
    dbwrite(x1); 
    dbwrite(y1); 
    dbwrite(x2); 
    dbwrite(y2); 
  } 
} 
 
loadstuff() { 
  if (dbopen("atexitSaveDB")) { 
    x1 = dbread('i'); 
    y1 = dbread('i'); 
    x2 = dbread('i'); 
    y2 = dbread('i'); 
  } 
} 
 
main() { 
  int e; 
 
  loadstuff(); 
  atexit(savestuff); // pass the pointer to savestuff() 
  graph_on(); 
  title("Drag the pen"); 
  line(1, x1, y1, x2, y2); 
   
  do { 
    e = event(1); 
    if (e == 2) { 
      x1 = penx(); 
      y1 = peny(); 
    } 
    if (e == 3) { 
      x2 = penx(); 
      y2 = peny(); 
      clearg(); 
      line(1, x1, y1, x2, y2); 
    } 
  } while (1); 
}