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Home » U++ Library support » U++ Library : Other (not classified elsewhere) » How to set a global (system) keyboard hook?
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| Re: How to set a global (system) keyboard hook? [message #23135 is a reply to message #23134] |
Fri, 18 September 2009 08:01   |
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| luzr wrote on Fri, 18 September 2009 06:55 |
You have to use host platform API (Win32).
I guess this one is what you need:
http://msdn.microsoft.com/en-us/library/ms646309%28VS.85%29. aspx?ppud=4
Then put GetHWND of some of your TopWindows in there and override
virtual LRESULT Ctrl::WindowProc(UINT message, WPARAM wParam, LPARAM lParam);
(Do not forget to call TopWindow::WindowProc at the end).
Mirek
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I'm interested in global(system)keyboard too.
but in linux how it can be realized? Is the standard method?
For X11 I found here:
int XGrabKey(Display *display, int keycode, unsigned int
modifiers, Window grab_window, Bool owner_events, int pointer_mode, int keyboard_mode);
int XUngrabKey(Display *display, int keycode, unsigned int
modifiers, Window grab_window);
Maybe it is time to add cross method in u++?
[Updated on: Fri, 18 September 2009 08:10] Report message to a moderator |
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| Re: How to set a global (system) keyboard hook? [message #23146 is a reply to message #23135] |
Fri, 18 September 2009 16:03 |
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About global hotkey!
FOR WIN32:
acourding by simple example from
http://msdn.microsoft.com/en-us/library/ms646309(VS.85).aspx?ppud=4
first we need to register hot key by calling:
BOOL RegisterHotKey(
HWND hWnd,
int id,
UINT fsModifiers,
UINT vk
);
and in U++ is already created a thread that execute function DWORD WINAPI Ctrl::Win32OverwatchThread(LPVOID). In this function is:
DWORD WINAPI Ctrl::Win32OverwatchThread(LPVOID)
{
............
MSG Msg;
=>>HERE while(GetMessage(&Msg, NULL, 0, 0) > 0) {
TranslateMessage(&Msg);
==>>HERE we can process our keyboard event
if(IsWindowUnicode(Msg.hwnd))
DispatchMessageW(&Msg); // send to aprpopiate phread
else
DispatchMessage(&Msg);
}
.....................
}
The problem is that I do not get keycode property from Msg. From where can I get it?
for linux X11:
acording by documentation from:
1. http://www.xfree.org/current/XGrabKey.3.html#toc2
The simple code like this:
Window root;
XEvent ev;
Display * dpy = XOpenDisplay(0);
if(!dpy) return 1;
root = DefaultRootWindow(dpy);
char * key_string = "F3";
KeyCode key = XKeysymToKeycode(dpy, XStringToKeysym(key_string));
XGrabKey(dpy, key , AnyModifier, root,
True, GrabModeAsync, GrabModeAsync);
for(;;)
{
XNextEvent(dpy, &ev);
if(ev.type == KeyPress && ev.xkey.keycode == key){
==>> Do our action
}
}
First we need register global hotkey by calling:
nt XGrabKey(Display *display, int keycode, unsigned int
modifiers, Window grab_window, Bool owner_events, int pointer_mode, int keyboard_mode);
In u++ we can get message from void Ctrl::EventLoop0(Ctrl *ctrl)
which call void Ctrl::ProcessEvent(XEvent *event)
The good news is that I have keycode from the returned message. like this "ev.xkey.keycode".
The Question:
2. Is possible to add in u++ cros-os method for register global hotkey event?
For first I propouse like this:
static bool Ctrl::AddGlobalHotkey(Key p_key, callback
p_func)
2. If is possible for register global hotkey event, maybe it is possible to unregister global hotkey event.
Maybe I was not understandable.
UPDATE:
Fro linux I found interesting example:
void
xstuff_grab_key_on_all_screens (int keycode,
guint modifiers,
gboolean grab)
{
GdkDisplay *display;
int n_screens;
int i;
display = gdk_display_get_default ();
n_screens = gdk_display_get_n_screens (display);
for (i = 0; i < n_screens; i++) {
GdkWindow *root;
root = gdk_screen_get_root_window (
gdk_display_get_screen (display, i));
if (grab)
XGrabKey (gdk_x11_display_get_xdisplay (display),
keycode, modifiers,
gdk_x11_drawable_get_xid (root),
True, GrabModeAsync, GrabModeAsync);
else
XUngrabKey (gdk_x11_display_get_xdisplay (display),
keycode, modifiers,
gdk_x11_drawable_get_xid (root));
}
}
UPDATE 2:
Good news is for win32 too. It returns keycode in Mgs->lParam.
Ion Lupascu (tojocky).
[Updated on: Fri, 18 September 2009 17:05] Report message to a moderator |
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| Re: How to set a global (system) keyboard hook? [message #23196 is a reply to message #23194] |
Fri, 25 September 2009 09:55 |
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| luzr wrote on Fri, 25 September 2009 00:05 |
Implemented.
See reference/HotKey
Mirek
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VERY NICE!
TESTED FOR WIN32 XP SP3 AND UBUNTU 9.04
BUT:
fro UBUNTU when I try to hint key: Ctrl + Alt + F11 then my gnome resets.
May be it is reserved hotkey for gnome?
I have another question: how can I hint CTRL+C+C?
I can do this when i get double CTRL+C CTRL+C and verifing interval from it to not be greater than 1 second.
Thank you Mirek, great job!
[Updated on: Fri, 25 September 2009 10:03] Report message to a moderator |
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| Re: How to set a global (system) keyboard hook? [message #23230 is a reply to message #23199] |
Thu, 01 October 2009 14:11 |
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Hello Mirek!
I found the interesting situation about Global Hotekey:
I want to register global hotkey for Ctrl+C+C and get from clickboard copied data.
I did so:
1. Register system hotkey Ctrl+C
TranslateHotKeyId = Ctrl::RegisterSystemHotKey(K_CTRL_C, THISBACK(GlobalShortCutHandle));
2. in my callback I wrote:
void GoogleTranslatorDemo::GlobalShortCutHandle(){
if(!AtomicRead(test_test)){
AtomicWrite(test_test,1);
bool need_translate = false;
if(shortcut_stage==0){
shortcut_stage = 1; // first Ctrl+C
time_stop_shortcut.Reset();
}
else if (time_stop_shortcut.Elapsed()<600){
need_translate = true;
shortcut_stage = 0;
}
else {
shortcut_stage = 1; // first Ctrl+C
time_stop_shortcut.Reset();
}
if(need_translate){
WString cur_text = ReadClipboardUnicodeText();
if(cur_text.GetLength()){
inputwindow.textedit.Set(cur_text);
TranslateTextInBaloon();
}
}
AtomicWrite(test_test,0);
}
}
On the second press Ctrl+C start translating.
The problem:
When I press Ctrl+C from the other application the standard command (copy text) do not react. In other words did not coping the selected text.
How can I do this?
[Updated on: Thu, 01 October 2009 14:12] Report message to a moderator |
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| Re: How to set a global (system) keyboard hook? [message #23235 is a reply to message #23231] |
Fri, 02 October 2009 08:03 |
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| luzr wrote on Thu, 01 October 2009 21:55 |
This cannot work. Once you register system hotkey, it gets "captured" by your application - that is the feature of both win32 and X11.
I suggest to use a little bit more exotic combos, like K_ALT|K_CTRL|K_SHIFT|K_C.
Mirek
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First Ctrl+C I need for copy in clipboard and the second Ctrl+C for processing copied text from clipboard (in my case is process translating).
Question:
Is not possible the given message to send follow to the other application?
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