strange header problem

irfanhab · 09-08-2004, 07:30 PM

Hi,

I've got a strange header file problem, because of which i can not compile my program.

Look the concerned files looks like this:

the xkeylock..cpp file

Code:

#include "xkeylock.h"

extern "C"
{
  #include <X11/Xlib.h>
  #include <X11/keysym.h>
  #include <X11/extensions/XTest.h>       //PROBLEM IS HERE
}
      

XKeyLock::XKeyLock(Display *a_display, QObject *parent, const char *name) 
  : QObject(parent, name), numlock_mask(0), capslock_mask(0), scrolllock_mask(0)
{
  display = a_display;

  KeyCode keycode;

  keycode = XKeysymToKeycode(display, XK_Num_Lock);
  if (keycode != NoSymbol)
  {
    numlock_mask = getModifierMapping(keycode);
    if (numlock_mask == 0) numlock_mask = setModifierMapping(keycode);
  }
    
  keycode = XKeysymToKeycode(display, XK_Caps_Lock);
  if (keycode != NoSymbol)
  {
    capslock_mask = getModifierMapping(keycode);
    if (capslock_mask == 0) capslock_mask = setModifierMapping(keycode);
  }
   
  keycode = XKeysymToKeycode(display, XK_Scroll_Lock);
  if (keycode != NoSymbol)
  {
    scrolllock_mask = getModifierMapping(keycode);
    if (scrolllock_mask == 0) scrolllock_mask = setModifierMapping(keycode);
  }
}

XKeyLock::~XKeyLock()
{
}

unsigned int XKeyLock::getModifierMapping(KeyCode keycode)
{
  unsigned int mask = 0;
  
  XModifierKeymap* map = XGetModifierMapping(display);
  
  for(int i = 0 ; i < 8; ++i)
    if (map->modifiermap[map->max_keypermod * i] == keycode) 
      mask = 1 << i;
  
  XFreeModifiermap(map);
  return mask;
}

unsigned int XKeyLock::setModifierMapping(KeyCode keycode)
{
  unsigned int mask = 0;
  XModifierKeymap* map = XGetModifierMapping(display);
  
  for(int i = 0 ; i < 8; ++i)
    if (map->modifiermap[map->max_keypermod * i] == 0) 
    {
      map->modifiermap[map->max_keypermod * i] = keycode;
      XSetModifierMapping(display, map);
      mask = 1 << i;
      break;
    }      

  XFreeModifiermap(map);
  return mask;
}


bool XKeyLock::isNumLockReadable()
{
  return (numlock_mask != 0);
}

bool XKeyLock::isCapsLockReadable()
{
  return (capslock_mask != 0);
}

bool XKeyLock::isScrollLockReadable()
{
  return (scrolllock_mask != 0);
}


bool XKeyLock::getNumLock()
{
  if (!XKeyLock::isNumLockReadable()) 
    return false;
  else 
    return (bool) (getIndicatorStates() & numlock_mask);
}

bool XKeyLock::getCapsLock()
{
  if (!XKeyLock::isCapsLockReadable()) 
    return false;
  else
    return (bool) (getIndicatorStates() & capslock_mask);
}

bool XKeyLock::getScrollLock()
{
  if (!XKeyLock::isScrollLockReadable()) 
    return false;
  else
    return (bool) (getIndicatorStates() & scrolllock_mask);
}


void XKeyLock::toggleNumLock()
{
  XTestFakeKeyEvent(display, XKeysymToKeycode(display, XK_Num_Lock), true, CurrentTime);
  XTestFakeKeyEvent(display, XKeysymToKeycode(display, XK_Num_Lock), false, CurrentTime);
}

void XKeyLock::toggleCapsLock()
{
  XTestFakeKeyEvent(display, XKeysymToKeycode(display, XK_Caps_Lock), true, CurrentTime);
  XTestFakeKeyEvent(display, XKeysymToKeycode(display, XK_Caps_Lock), false, CurrentTime);
}

void XKeyLock::toggleScrollLock()
{
  XTestFakeKeyEvent(display, XKeysymToKeycode(display, XK_Scroll_Lock), true, CurrentTime);
  XTestFakeKeyEvent(display, XKeysymToKeycode(display, XK_Scroll_Lock), false, CurrentTime);
}


void XKeyLock::setNumLock(bool state)
{
  if (numlock_mask !=0 && getNumLock() != state)
    toggleNumLock();
}

void XKeyLock::setCapsLock(bool state)
{
  if (capslock_mask !=0 && getCapsLock() != state)
    toggleCapsLock();
}

void XKeyLock::setScrollLock(bool state)
{
  if (scrolllock_mask !=0 && getScrollLock() != state)
    toggleScrollLock();
}

unsigned int XKeyLock::getIndicatorStates()
{
  Window dummy1, dummy2;
  int dummy3, dummy4, dummy5, dummy6;
  unsigned int indicatorStates;

  XQueryPointer(display, DefaultRootWindow(display), &dummy1, &dummy2,&dummy3, &dummy4, &dummy5, &dummy6, &indicatorStates);
	  
  return indicatorStates;
}

The problem is that when I compile I get this error:

Code:

g++ -Wl,-rpath,/usr/lib/qt/lib -o connectMonitor main.o xkeylock.o mainw.o moc_xkeylock.o moc_mainw.o   -L/usr/lib/qt/lib -L/usr/X11R6/lib -lqt-mt -lXext -lX11-lm
xkeylock.o(.text+0x547): In function `XKeyLock::toggleNumLock()':
: undefined reference to `XTestFakeKeyEvent'
xkeylock.o(.text+0x56a): In function `XKeyLock::toggleNumLock()':
: undefined reference to `XTestFakeKeyEvent'
xkeylock.o(.text+0x5a7): In function `XKeyLock::toggleCapsLock()':
: undefined reference to `XTestFakeKeyEvent'
xkeylock.o(.text+0x5ca): In function `XKeyLock::toggleCapsLock()':
: undefined reference to `XTestFakeKeyEvent'
xkeylock.o(.text+0x607): In function `XKeyLock::toggleScrollLock()':
: undefined reference to `XTestFakeKeyEvent'
xkeylock.o(.text+0x62a): more undefined references to `XTestFakeKeyEvent' follow
collect2: ld returned 1 exit status
make: *** [connectMonitor] Error 1

But as it turns out that `XTestFakeKeyEvent' is defined in X11/extensions/XTest.h, and this file is includede and the path is correct. So why is it acting as if I did not add the concerned header file?

aluser · 09-08-2004, 08:01 PM

ld is the linker; when it gives you "undefined reference" it means you forgot to link something, not that you forgot a header. Some grepping suggests the missing culprit is libXtst, whatever that is.

CroMagnon · 09-08-2004, 08:01 PM

Can you post the lines that define XTestFakeKeyEvent in the header file? It's not inside an #ifdef that might evaluate false?

CroMagnon · 09-08-2004, 08:03 PM

oops, aluser is right, silly me - don't paste that definition

irfanhab · 09-09-2004, 12:22 AM

Quote:

ld is the linker; when it gives you "undefined reference" it means you forgot to link something, not that you forgot a header

I 'copied' this file from KeybLED program, to control Keyboard LEDS, well, I checked for any external references but found that it was totally self-contained, so I copied it to my project and started using it until this happened.

Now the linker thing is a bit curious, because I compiled KeybLED too, and that compiled without any problems
the xkeylock.moc.lo file, which is for the linker is the exact same KeybLED has, but only in mine it gives an error?

Marius2 · 09-09-2004, 09:05 AM

Quote:

Originally posted by irfanhab
I 'copied' this file from KeybLED program, to control Keyboard LEDS, well, I checked for any external references but found that it was totally self-contained, so I copied it to my project and started using it until this happened.

Now the linker thing is a bit curious, because I compiled KeybLED too, and that compiled without any problems
the xkeylock.moc.lo file, which is for the linker is the exact same KeybLED has, but only in mine it gives an error?

I think aluser is right, error message meaning that you missed to link a library. You have a binary of KeybLED? You can
get it's dependencies with ldd (ldd <KeybLED binary>), it's one of the files dumped then that you should add to the list of
object files in your makefile.

HTH

aluser · 09-09-2004, 12:57 PM

ooor you can just throw -lXtst at the end of your command line and see if that fixes it. lol

irfanhab · 09-09-2004, 10:11 PM

Quote:

ooor you can just throw -lXtst at the end of your command line and see if that fixes it. lol

What do you mean?
make -lXtst

CroMagnon · 09-09-2004, 10:57 PM

Add it to your Makefile (there's usually a variable called LIBS or something similar - yours will have qt-mt, Xext, and X11-lm already in it)

irfanhab · 09-10-2004, 12:29 AM

Quote:

Add it to your Makefile (there's usually a variable called LIBS or something similar - yours will have qt-mt, Xext, and X11-lm already in it)

IT COMPILED IT!!!!!
The trick was that I had to add
-lXtst to the MakeFile under the LIBS tag

Thanx Everyone

Just one question to aluser:
How did you know I had to add -lXtst?

aluser · 09-10-2004, 01:02 AM

I did a

grep -r XTestFakeKeyEvent /usr/X11R6/lib

Normally you'd check /usr/lib, but this looked like an X11 function.

irfanhab · 09-10-2004, 01:10 AM

Quote:

grep -r XTestFakeKeyEvent /usr/X11R6/lib

nice...