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Why HANDLE created by 'CreateEvent' isn't valid in another process?


Why HANDLE created by 'CreateEvent' isn't valid in another process?

By : Jessica Hawkins
Date : November 22 2020, 10:33 AM
it should still fix some issue Handles are kinda like pointers in that they're usually process-specific. It takes special actions (like using DuplicateHandle) to share them.
Depending on the situation, it might just be easier to name the object and then have the other process access it that way. See the fourth parameter of CreateEvent.
code :


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is HDC handle valid for another process?

is HDC handle valid for another process?


By : Arun Kumar Raut
Date : March 29 2020, 07:55 AM
To fix the issue you can do You will need to expose a method of drawing onto the DC from within your application.
The most likely candidates are Windows Messages defined by you (WM_APP or WM_USER).
code :
WM_USER + 1,
WM_USER + 2,
WM_USER + 3,
etc...
switch case
{
  WM_USER + 1:
   // draw a circle
  WM_USER + 2:
   // draw a rectangle
  WM_USER + 3:
   // draw a snowman
}
SendMessage(hWndSergey, WM_USER + 1, 0, 0);
Should HANDLE returned by CreateEvent be disposed?

Should HANDLE returned by CreateEvent be disposed?


By : user2977142
Date : March 29 2020, 07:55 AM
To fix this issue If there is no destructor, then yes, the handle is leaked. There should be a destructor calling CloseHandle() to destroy the event.
As a side note, the class should also delete (C++11) or make inaccessible (C++03) the copy constructor and copy assignment operators, since the compiler-generated defaults will not make sense -- they are likely to copy the queued data, but still reference the same event handle, causing multiple seemingly-independent queues to share an event for no good reason. And when you do implement the destructor, the default copy implementation will be even worse because once one copy gets destructed it will destroy the event handle still in use by all of the other copies!
What is the Path of the event created in CreateEvent

What is the Path of the event created in CreateEvent


By : Cendrb
Date : March 29 2020, 07:55 AM
should help you out I guess that you are creating the event in the local session namespace so you'll likely find it in
code :
\Sessions\1\BaseNamedObjects
\BaseNamedObjects
Piping a valid pointer address created in a child process to a parent process

Piping a valid pointer address created in a child process to a parent process


By : JOSH IK
Date : March 29 2020, 07:55 AM
like below fixes the issue In short, you cannot do that. The pointer from the parent process is not usable in that way from the child because the two processes don't share the same address space. You have to use another method for communication from child to parent, such as some form of IPC or files.
Xcode 9 iOS Simulator - Unable To Obtain Valid Process Handle

Xcode 9 iOS Simulator - Unable To Obtain Valid Process Handle


By : VERA GREEN
Date : March 29 2020, 07:55 AM
wish of those help to @russbishop's suggestion of disabling 3rd party kernel extensions, I have found the culprit — One Periodic's Hands Off Firewall!
I unloaded the kext with this command:
code :
kextunload -b com.metakine.handsoff.driver
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