safehandle

SafeHandle is a mechanism of destruction, and what is the difference between her and the destructor.The first step is to understand the destructor. Destructors are not sequential in. NET, so you cannot assume that the destructor of another object runs after you, even if it is your member! If your members also have destructors, then what can you do and what should not be done?First, you should not assume that it did not clean up and try to clean it up.

non-criticalfinalizerobject derived type. In this way, managed resource classes can successfully access the objects of the CriticalFinalizerObject derived class in their Finalize method.3) If an AppDomain is forcibly interrupted by a host application (such as SQL server,asp.net), the CLR invokes the Finalize method of the CriticalFinalizerObject derived type. This feature is also used to ensure that local resources are freed when the host application no longer trusts the managed heap code that

can be instantiated. After P/Invoke is called, it is automatically initialized with Win32 error data, such as the code list of VirtualMemoryManger class. In this way, developers can provide custom error checks for each API and report errors in a standard way. 5.Use SafeHandle: in many cases, P/Invoke involves a resource, such as a Window handle. After these resources are used up, the code needs to clear them. However, do not force developers to remem

This time to give you a demonstration of the use of IOCP to pass the data between the examples, by the way to tell some details and attention to the place. Overview: The main use of IOCP's three api,createiocompletionport,postqueuedcompletionstatus,getqueuedcompletionstatus, The first is to create a completion port object, the second is to send data to a port, the third is to accept data, basically with three functions, you can write a simple example using IOCP. Which completes the port a kern

The libvlc. dll provided by the vlc-0.9.4 can be dynamically called, Jeremiah this blog introduces how to use C # And winform framework to call libvlc. dll as a simple player. 1. vs2005 new project, the vlc-0.9.4 libvlc. dll, libvlccore. dll, plugins directory all copy to the project directory \ bin \ debug.2. Create an abnormal structUsing system;Using system. Collections. Generic;Using system. text;Namespace myownplayer{// Exception structPublic struct predictionstruct{Private int raised;Pri

If you're getting one of the following exception messages in your application: Message:Keyset does not exist Stacktrace:At system. Security. cryptography. cryptographicexception. throwcryptogaphicexception (int32 hr)At system. Security. cryptography. safeprovhandle. _ freecsp (intptr pprovctx)At system. Security. cryptography. safeprovhandle. releasehandle ()At system. runtime. interopservices. safehandle. internalfinalize ()At system. runtime. int

introduction:Dbghelp.dll. It is part of the Microsoft Debug Help library, which contains a set of debugging programs that allow you to work with executable images in the portable executable (PE) format. For more information, please visit MSDN.Call it and you can generate the dump file directly, recording the running image of the program at that time.Its method API is as follows:[DllImport ("Dbghelp.dll", EntryPoint ="MiniDumpWriteDump", CallingConvention = callingconvention.stdcall, CharSet = c

for thread-safety. ")] private bool WaitOne (long timeout, bool exitContext) {return InternalWaitOne (safeWaitHandle, timeout, hasThreadAffinity, exitContext);} [System. security. securit YCritical] internal static bool InternalWaitOne (SafeHandle waitableSafeHandle, long millisecondsTimeout, bool hasThreadAffinity, bool exitContext) {Contract. endContractBlock (); int ret = WaitOneNative (waitableSafeHandle, (uint) millisecondsTimeout, hasThreadAffi

) { returnInternalwaitone (Safewaithandle, timeout, hasthreadaffinity, exitcontext); } [System.Security.SecurityCritical] Internal Static BOOLInternalwaitone (SafeHandle Waitablesafehandle,LongMillisecondstimeout,BOOLHasthreadaffinity,BOOLexitcontext) {Contract.endcontractblock (); intret = Waitonenative (Waitablesafehandle, (UINT) millisecondstimeout, hasthreadaffinity, exitcontext); if(ret = =wait_abandoned) {

thing is that the GC of the garbage collector determines how the object is a garbage object. For more information, see the link. Performance problems From the above discussion, we can see that automatic garbage collection requires cost, and the introduction of the concepts of generation and big object stack/small object stack is to minimize this cost. However, performance problems are inevitable. performance data analysis can help us understand and avoid some problems. For performance analysis

enumeration indicates that you want to read the file, write the file, or both. Then FileStream calls its own Init method for initialization, and in this process there is more detail to consider. In order to create a file, the initialization method requires additional information and checks, such as whether the process allows other processes to read and write files when using the file, whether the file path is valid, whether there is sufficient permissions, whether the target file is a file

IDisposable, and that it is easier and more secure to declare.using (StreamReader reader=new StreamReader (file)) { //your code hereAvoid garbage collector in the product codeIn addition to calling Gc.collect () to interfere with garbage collector, it is also possible to consider releasing or discarding resources appropriately. When performing a performance test, if you can bear the consequences of this effect, you should use garbage collector.Avoid writing finalizersUnlike some of the rumors

Results *Console.WriteLine ("Y ({0}) = {1}", X, Number1 +number2); $ Console.read ();Panax Notoginseng } - the //Start the first task: Calculate the x 8-Time Square + Static voidTaskProc1 (object o) A { theNumber1 = Math.pow (convert.todouble (o), 8); + } - $ //Start a second task: Calculate the 8 root of x $ Static voidTaskProc2 (object o) - { -Number2 = Math.pow (convert.todouble (o), 1.0/8.0); the } -}Line Pooling Example1[HostProtection (secur

I do not know when, there is such a strange problem, simple Httpclient.getasync ("xxxx") unexpectedly error.First, the problem descriptionThe original program from 2.0 to 2.1, suddenly found that the original normal operation of the Httpclient.getasync ("xxxx") actually did not work.To exclude interference from other references in the project, a new clean 2.1 project was created, and the main directly calledNew HttpClient (); var task = client. Getasync (URL); is still an error.The error messag

. Use try/finally blocks to ensure that resources have been properly freed, or that your class uses IDisposable, and that it is easier and more secure to declare. using (StreamReader reader=new StreamReader (file)) { //your code here Avoid garbage collector in the product code In addition to calling Gc.collect () to interfere with garbage collector, it is also possible to consider releasing or discarding resources appropriately. When performing a performance test, if

enters the try block.21st chapter Automatic Memory Management (garbage collection)Use the System.Runtime.ConstrainedExecution.CriticalFinalizerObject type to ensure finalization. The CLR treats the class and its derived classes in a very special way: 1. Pre-compiling the Finalize method; 2. When a non-criticalfinalizerobject derived type is called after the Finalize method, the finalize method of the CriticalFinalizerObject derived type is called.System.Runtime.InteropServices in the CriticalHa

enumeration indicates that you want to read the file, write the file, or both. Then FileStream calls its own Init method for initialization, and in this process there is more detail to consider. In order to create a file, the initialization method requires additional information and checks, such as whether the process allows other processes to read and write files when using the file, whether the file path is valid, whether there is sufficient permissions, whether the target file is a file

enumeration indicates that you want to read the file, write the file, or both. Then FileStream calls its own Init method for initialization, and in this process there is more detail to consider. In order to create a file, the initialization method requires additional information and checks, such as whether the process allows other processes to read and write files when using the file, whether the file path is valid, whether there is sufficient permissions, whether the target file is a file

. If you want to wrap the hosted object in safehandle (recommended alternative), you should rewrite the object. finalize is used to release unmanaged resources. If you forget to call dispose. Implement idisposable using objects To use unmanaged resources directly, you need to implement idisposable. If an application uses an object to implement idisposable, idisposable is not provided. However, you should call the idisposable. Dispose Implementation

, which are used to reference critical operating system resources. The new SafeHandle and CriticalHandle classes and their specialized derived classes provide a safe and reliable way to operate on operating system handles. The improvements to marshaling make it easier to interoperate with native code. Two enhancements to the interop marshaler meet two of the most common user requirements: the ability to wrap a native function pointer into a delega