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Questions tagged [safehandle]

28 questions
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1 answer

Does Marshal.Release() have an implicit ReliabilityContract?

I am writing a .NET application where I have to use API calls (really). My application gets COM interfaces by calling Win API's function CoCreateInstance(). Of course, I have to release those interfaces when having finished with them. I think that…
Binarus
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How to properly dispose of pinvoke/unmanaged code

I have code that needs to pinvoke a c dll, it seems to me that this code should implement idisposible since it touches unmanaged code. I could be wrong so please correct me if this is not true. Reading up on the stuff it seems like I should use…
nportelli
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Can I use SafeHandle to manage GCHandle?

SafeHandle gives a very strong guarantee that the resource it manages will eventually be released, even if an asynchronous exception occurs. Even using and try finally cannot guarantee that. I am thinking to use this guarantee to free a pinned…
yaskovdev
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How does .NET runtime convert SafeHandle to IntPtr and vice versa?

I have a C++ function that accepts a pointer to a native object. I can call the function from my C# code in two ways: Pass an IntPtr to it, like this, Pass the subclass of the SafeHandle to it, like this. While the first case is quite…
yaskovdev
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Is there a way to use StopSpeakingAsync on SpeechSynthesizer without Dispose hanging?

When trying to use SpeechSynthesizer from the Microsoft.CognitiveServices.Speech sdk, I noticed that Dispose() hangs if it gets called after StopSpeakingAsync has been called. Is there a way to circumvent this? I did a short console app that…
Martin Kallner
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Is there a way to send an array of SafeHandles to a native function from c#?

I have a native (c++) function that takes an array of pointers to images as an argument. In my c# API a pointer to an image is kept as a SafeHandle. Now I want to send an array of SafeHandles to my function but then I get into the following…
AndersG
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Using `SafeHandle` for a C API, that includes reference counting

I am working on Python interop. Internally, Python keeps reference counters for all objects via Py_IncRef and Py_DecRef. I want to ensure proper finalization of pointers to Python objects, so I am trying to create a class PyHandle derived from…
LOST
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What to use instead of SafeHandle.DangerousGetHandle?

I was looking at my SonarQube static code analysis and came across a report that says using a SafeTokenHandle DangerousGetHandle method call. I start by declaring a SafeTokenHandle: SafeTokenHandle safeTokenHandle; var returnValue =…
obizues
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P/Invoke with SafeHandle as reference parameter

I have a Function in an unmanaged Dll which expects a pointer to a Handle like that example: extern "C" __declspec(dllexport) BOOL __stdcall MySetEvent(HANDLE* handle, int size) { if (!handle) return FALSE; assert(sizeof(*handle) == size); …
AndiR
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How can I prevent the same unmanaged pointer from being encapsulated in two different SafeHandles?

I am writing a managed wrapper for a game engine written in C to challenge myself. I have started to wrap unmanaged pointers in SafeHandle derivatives, but it donned on me that calls to the unmanaged functions that could return the same pointer will…
sonicbhoc
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ASP.Net SafeHandle - tasks and examples

I want to understand how to work with unmanaged resources and when I need the SafeHandle class. What can be the problem statement when you can say: "Oh, here I need the SafeHandle class!"? I would be grateful for links to articles, examples,…
Kakao Developer
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Sending raw text to printer via usb

I am trying to send ZPL commands to a Zebra ZT230 printer. The printer and drivers are installed and the printer port is "USB003". The PC communicates perfectly with the printer via either Zebra Printer Setup Utilities or ZebraDesign. I tried the…
John Lee
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safe handle has been closed - numerous options to fix

I have a private function that creates a new serial port and opens it. From time to time, I get the "Safe handle has been closed" exception, that terminates the application. Now, I've been reading a few optional fixes and would like to know from…
NettaD
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