Re: Unique ID for a Window?
Le 29 juil. 2015 à 12:25, Dave d...@looktowindward.com a écrit :
Hi,
For reasons that are too complex to go in to, I need to somehow create a
Unique ID that is valid for the life of a Window. The Window I am trying to
identify is not owned by my App (think Screen Dump, like “Grab”).
I ran this code:
CFArrayRef windowList =
CGWindowListCopyWindowInfo(kCGWindowListOptionOnScreenOnly, kCGNullWindowID);
for (NSMutableDictionary* entry in (NSArray*)windowList)
{
NSString* ownerName = [entry objectForKey:(id)kCGWindowOwnerName];
NSInteger ownerPID = [[entry objectForKey:(id)kCGWindowOwnerPID]
integerValue];
NSLog(@%@:%ld, ownerName, (long)ownerPID);
}
CFRelease(windowList);
This is the dictionary returned for this Email message:
{
kCGWindowAlpha = 1;
kCGWindowBounds = {
Height = 858;
Width = 1003;
X = 874;
Y = 342;
};
kCGWindowIsOnscreen = 1;
kCGWindowLayer = 0;
kCGWindowMemoryUsage = 3462288;
kCGWindowName = New Message;
kCGWindowNumber = 2895;
kCGWindowOwnerName = Mail;
kCGWindowOwnerPID = 507;
kCGWindowSharingState = 1;
kCGWindowStoreType = 2;
},
Are one or more of these values guaranteed to be Unique (within the Window
List) and not to change during the life-time of the Window?
Thanks a lot.
All the Best
Dave
From the Window Services Reference:
kCGWindowNumber
The value for this key is a CFNumberRef
https://developer.apple.com/library/mac/documentation/CoreFoundation/Reference/CFNumberRef/index.html#//apple_ref/c/tdef/CFNumberRef
type (encoded as kCGWindowIDCFNumberType
https://developer.apple.com/library/mac/documentation/Carbon/Reference/CGWindow_Reference/Constants/Constants.html#//apple_ref/c/macro/kCGWindowIDCFNumberType)
that contains the window ID. The window ID is unique within the current user
session.
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Unique ID for a Window?
Hi,
For reasons that are too complex to go in to, I need to somehow create a Unique
ID that is valid for the life of a Window. The Window I am trying to identify
is not owned by my App (think Screen Dump, like “Grab”).
I ran this code:
CFArrayRef windowList =
CGWindowListCopyWindowInfo(kCGWindowListOptionOnScreenOnly, kCGNullWindowID);
for (NSMutableDictionary* entry in (NSArray*)windowList)
{
NSString* ownerName = [entry objectForKey:(id)kCGWindowOwnerName];
NSInteger ownerPID = [[entry objectForKey:(id)kCGWindowOwnerPID]
integerValue];
NSLog(@%@:%ld, ownerName, (long)ownerPID);
}
CFRelease(windowList);
This is the dictionary returned for this Email message:
{
kCGWindowAlpha = 1;
kCGWindowBounds = {
Height = 858;
Width = 1003;
X = 874;
Y = 342;
};
kCGWindowIsOnscreen = 1;
kCGWindowLayer = 0;
kCGWindowMemoryUsage = 3462288;
kCGWindowName = New Message;
kCGWindowNumber = 2895;
kCGWindowOwnerName = Mail;
kCGWindowOwnerPID = 507;
kCGWindowSharingState = 1;
kCGWindowStoreType = 2;
},
Are one or more of these values guaranteed to be Unique (within the Window
List) and not to change during the life-time of the Window?
Thanks a lot.
All the Best
Dave
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Re: Unique ID for a Window?
From the Window Services Reference: kCGWindowNumber The value for this key is a CFNumberRef https://developer.apple.com/library/mac/documentation/CoreFoundation/Reference/CFNumberRef/index.html#//apple_ref/c/tdef/CFNumberRef type (encoded as kCGWindowIDCFNumberType https://developer.apple.com/library/mac/documentation/Carbon/Reference/CGWindow_Reference/Constants/Constants.html#//apple_ref/c/macro/kCGWindowIDCFNumberType) that contains the window ID. The window ID is unique within the current user session. Yes I saw this, I wasn’t sure what “Current User Session” meant in this case. Also if there could be a window owned by one App with the same CGWindowNumber as another App, IOW, if there could be more than one Window in the Window Array that has the same number? e.g. I need more than once piece of info to ensure it is unique. Cheers Dave ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Unique ID for a Window?
On 29 Jul 2015, at 13:12, Uli Kusterer witness.of.teacht...@gmx.net wrote: Note that I'm saying at a time. There is no guarantee that an application might not close the window whose number you have, then open a new one, and get a new window with the same number. It's unlikely to happen, but I don't think it's stated anywhere that that is impossible. OTOH, also keep in mind that an application might close a window and re-open it instead of just hiding and showing it, which might change its window number. That’s ok, because I track Window Close/Open and will just create a new ID when a window is opened. Thanks for the clarification. All the Best Dave ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Unique ID for a Window?
On 29 Jul 2015, at 13:25, Dave d...@looktowindward.com wrote: Yes I saw this, I wasn’t sure what “Current User Session” meant in this case. Also if there could be a window owned by one App with the same CGWindowNumber as another App, IOW, if there could be more than one Window in the Window Array that has the same number? e.g. I need more than once piece of info to ensure it is unique. AFAIK it's the number the window server uses to identify a window. So unless you have multiple user sessions (i.e. you have a second user logged in using Fast User Switching), there is only one window with that ID at a time. It is unique across all the applications running under the same user's account. Which usually is all windows your application can see (unless your app is running as root, but really, nobody except maybe login screen plugin developers would do that). Note that I'm saying at a time. There is no guarantee that an application might not close the window whose number you have, then open a new one, and get a new window with the same number. It's unlikely to happen, but I don't think it's stated anywhere that that is impossible. OTOH, also keep in mind that an application might close a window and re-open it instead of just hiding and showing it, which might change its window number. Cheers, -- Uli Kusterer The Witnesses of TeachtText are everywhere... ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
