A hook is a point in the system message-handling mechanism where an application can install a subroutine to monitor the message traffic in the system and process certain types of messages before they reach the target window procedure. In This Section Name Description Discusses how hooks should be used. Demonstrates how to perform tasks associated with hooks.

Contains the API reference. Hook Functions Name Description Passes the specified message and hook code to the hook procedures associated with the and WH_MSGFILTER hook procedures. Passes the hook information to the next hook procedure in the current hook chain. A hook procedure can call this function either before or after processing the hook information. An application-defined or library-defined callback function used with the function. The system calls this function before calling the window procedure to process a message sent to the thread. An application-defined or library-defined callback function used with the function.

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The system calls this function after the function is called. The hook procedure can examine the message; it cannot modify it. An application-defined or library-defined callback function used with the function. The system calls this function before activating, creating, destroying, minimizing, maximizing, moving, or sizing a window; before completing a system command; before removing a mouse or keyboard event from the system message queue; before setting the keyboard focus; or before synchronizing with the system message queue. A computer-based training (CBT) application uses this hook procedure to receive useful notifications from the system. An application-defined or library-defined callback function used with the function.

The system calls this function before calling the hook procedures associated with any type of hook. The system passes information about the hook to be called to the hook procedure, which examines the information and determines whether to allow the hook to be called. An application-defined or library-defined callback function used with the function. The system calls this function whenever the foreground thread is about to become idle. An application-defined or library-defined callback function used with the function.

The system calls this function whenever the or function has retrieved a message from an application message queue. Before returning the retrieved message to the caller, the system passes the message to the hook procedure. An application-defined or library-defined callback function used with the function. Typically, an application uses this function to play back a series of mouse and keyboard messages recorded previously by the hook procedure. As long as a hook procedure is installed, regular mouse and keyboard input is disabled. An application-defined or library-defined callback function used with the function.