Download interfacehook . dll

As we have already said, to provide an API hooking example, we will make the calc. As we cannot find the full information in the winternl. The creation and initialization of a global variable allows us to store the address of an original function:. After a function has been hooked, first it calls the original function. Then we examine SystemInformationClass.

In case it reveals to be SystemProcessInformation, in the list of running processes, we need to find and remove all records related to calc. Please note that the original and hooked functions must have identical signatures. After that, examine the processes in the Windows Task Manager: the calc.

As the provided API hook is global, we can see that the same result is displayed by other programs with functionality similar to Windows Task Manger.

For example, Process Explorer from Mark Russinovich. The process of standard Windows calculator and all its instances have been successfully hidden. The API hook works as expected. By clicking OK you give consent to processing your data and subscription to Apriorit Blog updates.

Global hooks: These affect all system processes. The items must be separated either by commas or spaces. Privacy policy. The following code examples demonstrate how to perform the following tasks associated with hooks:. You can install a hook procedure by calling the SetWindowsHookEx function and specifying the type of hook calling the procedure, whether the procedure should be associated with all threads in the same desktop as the calling thread or with a particular thread, and a pointer to the procedure entry point.

You must place a global hook procedure in a DLL separate from the application installing the hook procedure. The installing application must have the handle to the DLL module before it can install the hook procedure. After you have obtained the handle, you can call the GetProcAddress function to retrieve a pointer to the hook procedure.

Finally, use SetWindowsHookEx to install the hook procedure address in the appropriate hook chain. SetWindowsHookEx passes the module handle, a pointer to the hook-procedure entry point, and 0 for the thread identifier, indicating that the hook procedure should be associated with all threads in the same desktop as the calling thread.

This sequence is shown in the following example. You can release a thread-specific hook procedure remove its address from the hook chain by calling the UnhookWindowsHookEx function, specifying the handle to the hook procedure to release. The Shell will call each copy hook handler registered for a folder object until all the handlers have been called or until one of them has returned a value other than IDYES. Implement a copy hook handler when you want to be able to control when, or if, these file system operations are performed on a given object.

You might want to use a copy hook handler on shared folders, for example. You do not call this Shell extension directly. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info.