I frequently use nativeHandle with js-ctypes in Windows.
I would like to now use it in Linux. This code below focuses the window but it then crashes. You can see the window get focused. It doesn't crash when I don't use nativeHandle.
How can I avoid the crash? There is nothing wrong with the code except this:
var cHwnd = ctypes.voidptr_t(ctypes.UInt64(tBaseWin.nativeHandle));
You can copy paste this code to scratchpad and run, you will see the window focus then Firefox will crash.
Code is pasted below
Cu.import('resource://gre/modules/ctypes.jsm')
var nixtypesInit = function() {
// BASIC TYPES (ones that arent equal to something predefined by me)
this.ATOM = ctypes.unsigned_long;
this.BOOL = ctypes.int;
this.CHAR = ctypes.char;
this.DATA = ctypes.voidptr_t;
this.DISPLAY = new ctypes.StructType('Display');
this.INT = ctypes.int;
this.LONG = ctypes.long;
this.STATUS = ctypes.int;
this.UNSIGNED_CHAR = ctypes.unsigned_char;
this.UNSIGNED_LONG = ctypes.unsigned_long;
this.WINDOW = ctypes.unsigned_long;
// ADVANCED TYPES (ones that are equal to something predefined by me)
/* http://www.man-online.org/page/3-XClientMessageEvent/
* typedef struct {
* int type; // ClientMessage
* unsigned long serial; // # of last request processed by server
* Bool send_event; // true if this came from a SendEvent request
* Display *display; // Display the event was read from
* Window window;
* Atom message_type;
* int format;
* union {
* char b[20];
* short s[10];
* long l[5];
* } data;
* } XClientMessageEvent;
*/
this.XCLIENTMESSAGEEVENT = new ctypes.StructType('XClientMessageEvent', [
{ 'type': ctypes.int }, // ClientMessage
{ 'serial': ctypes.unsigned_long }, // # of last request processed by server
{ 'send_event': this.BOOL }, // true if this came from a SendEvent request
{ 'display': this.DISPLAY.ptr }, // Display the event was read from
{ 'window': this.WINDOW },
{ 'message_type': this.ATOM },
{ 'format': ctypes.int },
{ 'l0': ctypes.long },
{ 'l1': ctypes.long },
{ 'l2': ctypes.long },
{ 'l3': ctypes.long },
{ 'l4': ctypes.long }
]);
// CONSTANTS
this.BADGC = 13;
this.NONE = 0;
this.NULL = ctypes.cast(ctypes.uint64_t(0x0), ctypes.voidptr_t);
}
var ostypes = new nixtypesInit();
console.log('ostypes.NULL:', ostypes.NULL, uneval(ostypes.NULL))
var lib = {};
function _lib(path) {
//ensures path is in lib, if its in lib then its open, if its not then it adds it to lib and opens it. returns lib
//path is path to open library
//returns lib so can use straight away
if (!(path in lib)) {
//need to open the library
//default it opens the path, but some things are special like libc in mac is different then linux or like x11 needs to be located based on linux version
switch (path) {
case 'x11':
try {
lib[path] = ctypes.open('libX11.so.6');
} catch (e) {
try {
var libName = ctypes.libraryName('X11');
} catch (e) {
console.error('Integration Level 1: Could not get libX11 name; not activating', 'e:' + e);
throw new Error('Integration Level 1: Could not get libX11 name; not activating, e:' + e);
}
try {
lib[path] = ctypes.open(libName);
} catch (e) {
console.error('Integration Level 2: Could not get libX11 name; not activating', 'e:' + e);
throw new Error('Integration Level 2: Could not get libX11 name; not activating, e:' + e);
}
}
break;
default:
try {
lib[path] = ctypes.open(path);
} catch (e) {
console.error('Integration Level 1: Could not get open path:', path, 'e:' + e);
throw new Error('Integration Level 1: Could not get open path:"' + path + '" e: "' + e + '"');
}
}
}
return lib[path];
}
// declares in this worker, i set them all = to null for the scratchpad because i may declare it wrong and it wont re-declare unless if it first the var is !
var dec = {};
function _dec(declaration) { // it means ensureDeclared and return declare. if its not declared it declares it. else it returns the previously declared.
if (!(declaration in dec)) {
dec[declaration] = preDec[declaration](); //if declaration is not in preDec then dev messed up
}
return dec[declaration];
}
var preDec = { //stands for pre-declare (so its just lazy stuff) //this must be pre-populated by dev // do it alphabateized by key so its ez to look through
DefaultRootWindow: function() {
// MACRO
/* http://www.xfree86.org/4.4.0/DefaultRootWindow.3.html
* Window DefaultRootWindow(
* Display *display
* );
*/
return _lib('x11').declare('XDefaultRootWindow', ctypes.default_abi,
ostypes.WINDOW, // return
ostypes.DISPLAY.ptr // *display
);
},
XCloseDisplay: function() {
/* http://www.xfree86.org/4.4.0/XCloseDisplay.3.html
* int XCloseDisplay(
* Display *display
* );
*/
return _lib('x11').declare('XCloseDisplay', ctypes.default_abi,
ostypes.INT, // return
ostypes.DISPLAY.ptr // *display
);
},
XFlush: function() {
/* http://www.xfree86.org/4.4.0/XFlush.3.html
* int XFlush(
* Display *display
* );
*/
return _lib('x11').declare('XFlush', ctypes.default_abi,
ostypes.INT, // return
ostypes.DISPLAY.ptr // *display
);
},
XFree: function() {
/* http://www.xfree86.org/4.4.0/XFree.3.html
* int XFree(
* void *data
* );
*/
return _lib('x11').declare('XFree', ctypes.default_abi,
ostypes.INT, // return
ostypes.DATA // *data
);
},
XInternAtom: function() {
/* http://www.xfree86.org/4.4.0/XInternAtom.3.html
* Atom XInternAtom(
* Display *display,
* char *atom_name,
* Bool only_if_exists
* );
*/
return _lib('x11').declare('XInternAtom', ctypes.default_abi,
ostypes.ATOM, // return
ostypes.DISPLAY.ptr, // *display
ostypes.CHAR.ptr, // *atom_name
ostypes.BOOL // only_if_exists
);
},
XMapRaised: function() {
/* http://www.xfree86.org/4.4.0/XMapRaised.3.html
* int XMapRaised(
* Display *display
* Window w
* );
*/
return _lib('x11').declare('XMapRaised', ctypes.default_abi,
ostypes.INT, // return
ostypes.DISPLAY.ptr, // *display
ostypes.WINDOW // w
);
},
XOpenDisplay: function() {
/* http://www.xfree86.org/4.4.0/XOpenDisplay.3.html
* Display *XOpenDisplay(
* char *display_name
* );
*/
return _lib('x11').declare('XOpenDisplay', ctypes.default_abi,
ostypes.DISPLAY.ptr, // return
ostypes.CHAR.ptr // *display_name
);
},
XSendEvent: function() {
/* http://www.xfree86.org/4.4.0/XSendEvent.3.html
* Status XSendEvent(
* Display *display,
* Window w,
* Bool propagate,
* long event_mask,
* XEvent *event_send
* );
*/
return _lib('x11').declare('XSendEvent', ctypes.default_abi,
ostypes.STATUS, // return
ostypes.DISPLAY.ptr, // *display
ostypes.WINDOW, // w
ostypes.BOOL, // propagate
ostypes.LONG, // event_mask
ostypes.XCLIENTMESSAGEEVENT.ptr // event_sent*
);
}
}
function OpenNewXDisplay() {
var nullChar = ctypes.cast(ostypes.NULL, ostypes.CHAR.ptr);
var rez_XOpenDisplay = _dec('XOpenDisplay')(nullChar);
if (rez_XOpenDisplay.isNull()) {
throw new Error('XOpenDisplay failed to open display');
}
return rez_XOpenDisplay;
}
var GetXDisplayConst = undefined; //ostypes.DISPLAY // runtime defined constants
function GetXDisplay() {
if (!GetXDisplayConst) {
GetXDisplayConst = OpenNewXDisplay();
}
return GetXDisplayConst;
}
function shutdown() {
if (GetXDisplay() && GetXDisplay().isNull && !GetXDisplay().isNull()) {
var rez_XCloseDisplay = _dec('XCloseDisplay')(GetXDisplay());
if (rez_XCloseDisplay != 0) {
throw new Error('XCloseDisplay failed with error code: ' + rez_XCloseDisplay);
}
}
for (var l in lib) {
lib[l].close();
}
}
var GetAtomCache = {};
function GetAtom(name) {
// name is ostypes.CHAR.ptr
// returns ostypes.ATOM
if (!(name in GetAtomCache)) {
var atom = _dec('XInternAtom')(GetXDisplay(), name, 0); //passing 3rd arg of false, means even if atom doesnt exist it returns a created atom, this can be used with GetProperty to see if its supported etc, this is how Chromium does it
if (atom == ostypes.NONE) { //will never equal ostypes.NONE because i pass 3rd arg of `false` to XInternAtom
console.warn('No atom with name:', name, 'return val of atom:', atom, uneval(atom), atom.toString());
throw new Error('No atom with name "' + name + '"), return val of atom:"' + atom + '" toString:"' + atom.toString() + '"');
}
GetAtomCache[name] = atom;
}
return GetAtomCache[name];
}
function main() {
var tWin = Services.wm.getMostRecentWindow('navigator:browser');
if (!tWin) {
throw new Error('getMostRecentWindow failed to find a window');
}
var tBaseWin = tWin.QueryInterface(Ci.nsIInterfaceRequestor).getInterface(Ci.nsIWebNavigation).QueryInterface(Ci.nsIDocShellTreeItem).treeOwner.QueryInterface(Ci.nsIInterfaceRequestor).getInterface(Ci.nsIBaseWindow);
var cHwnd = ostypes.WINDOW(tBaseWin.nativeHandle);
console.info('debug-msg :: cHwnd : ', cHwnd, uneval(cHwnd), cHwnd.toString());
var rootWin = _dec('DefaultRootWindow')(GetXDisplay());
console.info('debug-msg :: rootWin:', rootWin, uneval(rootWin), rootWin.toString());
var event = new ostypes.XCLIENTMESSAGEEVENT();
event.type = 33;
event.serial = 0;
event.send_event = 1;
event.message_type = GetAtom('_NET_ACTIVE_WINDOW'); //_dec('XInternAtom')(GetXDisplay(), '_NET_ACTIVE_WINDOW', 0);
event.display = GetXDisplay();
event.window = cHwnd;
event.format = 32;
event.l0 = 2;
var mask = 1 << 20 /* SubstructureRedirectMask */ | 1 << 19 /* SubstructureNotifyMask */ ;
var rez_XSendEvent = _dec('XSendEvent')(GetXDisplay(), rootWin, 0, mask, event.address());
console.info('debug-msg :: rez_XSendEvent:', rez_XSendEvent, uneval(rez_XSendEvent), rez_XSendEvent.toString());
if (rez_XSendEvent) {
var rez_XMapRaised = _dec('XMapRaised')(GetXDisplay(), cHwnd);
console.info('debug-msg :: rez_XMapRaised:', rez_XMapRaised, uneval(rez_XMapRaised), rez_XMapRaised.toString());
var rez_XFlush = _dec('XFlush')(GetXDisplay());
console.info('debug-msg :: rez_XFlush:', rez_XFlush, uneval(rez_XFlush), rez_XFlush.toString());
console.log('Activated successfully');
return true;
} else {
console.warn('An error occurred activating the window');
return false;
}
}
try {
main();
} catch(ex) {
console.error(ex);
} finally {
shutdown();
}
Solution found and MDN updated, done awhile ago but I thought would post solution here too.
https://developer.mozilla.org/en-US/Add-ons/Code_snippets/Finding_Window_Handles#Unix