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Questions tagged [handle]

Handle is an abstraction of a resource or a reference to an entity. It can have different implementations: a pointer, an index in a table etc.

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what is a file handle and where it is useful for a programmer?

I am learning assembly language along with C. this new chapter I started talks about 'file handles', file handles for screen display and file handles for keyboard input etc. I don't know what is a file handle? I am referring to IBM PC ASSEMBLY…
KawaiKx
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`return None` in python not recommended. How to bypass?

I have a function which connects to a url by httplib using lxml. It checks by xpathfor a certain pattern and if the check is positive it returns a string. But if the check was negative it returns nothing. Now the situation is, that my function…
Aufwind
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How can I tell how much memory a handle object uses in matlab

If I declare an object to be a subclass of handle classdef obj < handle my object is now essentially a "pointer" to some memory somewhere. How do I find out how much memory my object is using up? For example, say I have a class foo with a field…
Marc
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What is the difference between a Pointer and a Handle

I cannot say I have a strong C++ background so I hear Handle very often these days. I know what a Pointer is (which stores address of the memory location like reference) but I am not really sure what Handle is and what the differences are between…
Tarik
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Catching/hijacking stdout in haskell

How can I define 'catchOutput' so that running main outputs only 'bar'? That is, how can I access both the output stream (stdout) and the actual output of an io action separately? catchOutput :: IO a -> IO (a,String) catchOutput =…
worldsayshi
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Preventing file handle inheritance in multiprocessing lib

Using multiprocessing on windows it appears that any open file handles are inherited by spawned processes. This has the unpleasant side effect of locking them. I'm interested in either: 1) Preventing the inheritance 2) A way to release the file…
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Forcing the creation of a WPF Window's native Win32 handle

I need to access the Win32 window handles of some of my WPF windows so I can handle Win32 activation messages. I know I can use PresentationSource.FromVisual or WindowInteropHelper to get the Win32 window handle, but I am running into problems if…
Zach Johnson
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Handle Keyboard Done pressed event on Iphone

I am moving my view when a text field is pressed in order to get proper view when keyboard appears. Now, when the Done keyboard button is pressed, I would like to return the view to its initial state. How do I handle an action when the done keyboard…
Ruthy
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Resize Element with box handles in corners

in Jcrop , after selecting cropping area , a div appears with box handles in corners. Is there any jQuery plugin that can build this type of box handles ?
Mironline
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Android, handle SQLiteConstraintException

I've got this method in Android: public void insertarTitulo(String _id, String title, String url){ ContentValues cv = new ContentValues(); cv.put("_id", _id); cv.put("title", title); cv.put("URL", url); try{ …
butelo
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Do I have to close inherited handle later owned by child process?

Microsoft played safe here. In their article, "Creating a Child Process with Redirected Input and Output", they are saying: The remaining open handles are cleaned up when this process terminates. To avoid resource leaks in a larger application,…
GSerg
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Delphi: Check whether file is in use

I want to write to/delete a file but sometimes I get a crash if the file is in use by another program. How do I check to see whether the file is opened by another process or I can open it for writing?
Arthur
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How to make a program not show up in Alt-Tab or on the taskbar

I have a program that needs to sit in the background and when a user connects to a RDP session it will do some environment setup then launch a program. When the program is closed it will do some housekeeping and logoff the session. The current way I…
Scott Chamberlain
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Handle a JNI crash

I have a dll that contains legacy C code, I call this dll via JNI, but sometimes the C code crashes and causes the JVM to terminate. Is it there a way to avoid JVM crash? Can I handle the JNI fault and let the JVM survive? :)
Farr
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How do you obtain Current Window Handle Count and Window Handle Limit in .NET?

I want to obtain the current number of window handles and the system-wide window handle limit in C#. How do I go about this?
Roel Vlemmings
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