What is CloseHandle?

CloseHandle invalidates the specified object handle, decrements the object’s handle count, and performs object retention checks. After the last handle to an object is closed, the object is removed from the system. Closing a thread handle does not terminate the associated thread.

When to call CloseHandle?

Generally, an application should call CloseHandle once for each handle it opens. It is usually not necessary to call CloseHandle if a function that uses a handle fails with ERROR_INVALID_HANDLE, because this error usually indicates that the handle is already invalidated.

What is WriteProcessMemory?

WriteProcessMemory copies the data from the specified buffer in the current process to the address range of the specified process. Any process that has a handle with PROCESS_VM_WRITE and PROCESS_VM_OPERATION access to the process to be written to can call the function.

What is handle in C++?

In C++/CLI, a handle is a pointer to an object located on the GC heap. Creating an object on the (unmanaged) C++ heap is achieved using new and the result of a new expression is a “normal” pointer. A managed object is allocated on the GC (managed) heap with a gcnew expression. The result will be a handle.

What is Process32First?

Process32First retrieves information about the first process in the process list contained in a system snapshot. This snapshot must have previously been generated using the CreateToolhelp32Snapshot function.

What is Lpvoid?

LPVOID. LPVOID data types are defined as being a “pointer to a void object”. This means that LPVOID pointers can be used to point to different types of objects, without creating a compiler error. However, the burden is on the programmer to keep track of what type of object is being pointed to.

What is Page_execute_readwrite?

An attempt to write to a committed copy-on-write page results in a private copy of the page being made for the process. The private page is marked as PAGE_EXECUTE_READWRITE, and the change is written to the new page.

What does a DLL injector do?

In computer programming, DLL injection is a technique used for running code within the address space of another process by forcing it to load a dynamic-link library. DLL injection is often used by external programs to influence the behavior of another program in a way its authors did not anticipate or intend.

What is handle in Win32?

A HANDLE in Win32 programming is a token that represents a resource that is managed by the Windows kernel. A handle can be to a window, a file, etc. Handles are simply a way of identifying a particulate resource that you want to work with using the Win32 APIs.

What are handles in code?

In computer programming, a handle is an abstract reference to a resource that is used when application software references blocks of memory or objects that are managed by another system like a database or an operating system.

What is the use of CloseHandle in Linux?

In general, CloseHandle invalidates the specified object handle, decrements the object’s handle count, and performs object retention checks. After the last handle to an object is closed, the object is removed from the system. For a summary of the creator functions for these objects, see Kernel Objects.

What happens when you close a thread handle?

Closing a thread handle does not terminate the associated thread or remove the thread object. Closing a process handle does not terminate the associated process or remove the process object. To remove a thread object, you must terminate the thread, then close all handles to the thread. For more information, see Terminating a Thread.

What happens when you close an object with CloseHandle?

CloseHandle invalidates the specified object handle, decrements the object’s handle count, and performs object retention checks. After the last handle to an object is closed, the object is removed from the system. Persistent objects such as databases and files will remain in storage, but must be re-opened to be accessed again.

What happens when you close a thread in Linux?