Windows api get process handle

The standard handles of a process may be redirected by a call to SetStdHandle , in which case GetStdHandle returns the redirected handle. Some applications may also vary their behavior on the type of inherited handle.

Disambiguating the type between console, pipe, file, and others can be performed with GetFileType. The returned value is simply a copy of the value stored in the process table. The process itself is generally considered the owner of these handles and their lifetime.

Each handle is placed in the table on creation depending on the inheritance and launch specifics of the CreateProcess call and will be freed when the process is destroyed. Manual manipulation of the lifetime of these handles may be desirable for an application intentionally trying to replace them or block other parts of the process from using them. Closing the handle explicitly via CloseHandle will close it process-wide and the next usage of any cached reference will encounter an error.

There is no validation of the values stored as handles in the process table by either the GetStdHandle or SetStdHandle functions. If the existing value of the standard handle is NULL , or the existing value of the standard handle looks like a console pseudohandle, the handle is replaced with a console handle. Improve this answer. Abyx Abyx Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name.

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This can happen if you close a handle twice, or if you call CloseHandle on a handle returned by the FindFirstFile function instead of calling the FindClose function. Generally, an application should call CloseHandle once for each handle it opens. In this case, the application should close the handle. If a handle is transacted, all handles bound to a transaction should be closed before the transaction is committed.

For more information about transacted objects, see Working With Transactions. 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. From these identifiers, the Module functions Module32First and Module32Next are used to walk through the modules to find the corresponding names of the processes. Note that only main-level windows are listed by the function.

The function that is called is EnumWindowsProc and accepts two arguments. The first will be the handle of the window that is currently being examined, and the second is a user-defined argument that is passed to the EnumWindows function.

In our case, the argument passed is the CListBox member that we would like data stored in. In the EnumWindowsProc function also known as a callback function, since it is called by Windows , the title of the window is stored in the list box for the user to view.