Setwindowshookex pinvoke c

For example the EnableWindow function sends this message when disabling the specified window. The window procedure of the new window receives this message after the window is created but before the window becomes visible. However only owner-drawn buttons respond to the parent window processing this message. By responding to this message the dialog box can set its text and background colors using the specified display device context handle.

By responding to this message the parent window can use the specified device context handle to set the text and background colors of the edit control.

By responding to this message the parent window can set the text and background colors of the list box by using the specified display device context handle. By responding to this message the owner window can set the text and background colors of the message box by using the given display device context handle. By responding to this message the parent window can use the display context handle to set the background color of the scroll bar control. By responding to this message the parent window can use the specified device context handle to set the text and background colors of the static control.

A dead key is a key that generates a character such as the umlaut double-dot that is combined with another character to form a composite character. For example the umlaut-O character? This message is sent first to the window being destroyed and then to the child windows if any as they are destroyed.

During the processing of the message it can be assumed that all child windows still exist. By default the system handles all keyboard input to the control; the system interprets certain types of keyboard input as dialog box navigation keys. An application can use this message to override the window's default maximized size and position or its default minimum or maximum tracking size.

Applications never send this message directly. However server applications handle this message. To send this message the application calls the SendMessage function with the following parameters.

This allows an application to modify the menu before it is displayed without changing the entire menu. You should make any application-specific settings and pass the message to the DefWindowProc function which passes the message to all first-level child windows. These child windows can pass the message to DefWindowProc to have it pass the message to their child windows and so on. A nonsystem key is a key that is pressed when the ALT key is not pressed or a keyboard key that is pressed when a window has the keyboard focus.

If the mouse is not captured the message is posted to the window beneath the cursor. Otherwise the message is posted to the window that has captured the mouse. The system places the child window's window menu icon in the rightmost position of the frame window's menu bar and places the child window's restore icon in the leftmost position.

If the mouse is not captured the message is posted to the window that contains the cursor. There should be no internal forwarding of the message since DefWindowProc propagates it up the parent chain until it finds a window that processes it.

By processing this message an application can monitor the position of the drag rectangle and if needed change its position. By processing this message an application can control the content of the window's client area when the size or position of the window changes.

If the mouse is not captured the message is sent to the window beneath the cursor. Otherwise the message is sent to the window that has captured the mouse. If a window has captured the mouse this message is not posted.

This message is not sent by newer versions of Microsoft Windows except in unusual circumstances explained in the Remarks. This message enables windows that do not have the keyboard focus to realize their logical palettes and update their client areas.

When the child window is being destroyed the system sends the message before any processing to destroy the window takes place. If any application returns zero the session is not ended. For the content of the clipboard to remain available to other applications the clipboard owner must render data in all the formats it is capable of generating and place the data on the clipboard by calling the SetClipboardData function.

When the user presses the hot key the system activates the window. By processing this message an application can monitor the size and position of the drag rectangle and if needed change its size or position. It specifies the character code of a system character key — that is a character key that is pressed while the ALT key is down. When this message is sent to an edit control the previously deleted text is restored or the previously added text is deleted.

When the user logs on or off the system updates the user-specific settings. You may want to use the custom-built SizingWindowSide enumeration for the wParam passed in with this message. You may want to use the custom-built WindowHitTestRegions enumeration for the Result generated by this message. Drawing; using System. Collections; using System. ComponentModel; using System. Forms; using System. Data; using System.

Size 5, 13 ; this. Size , ; this. EventHandler this. Check with WindowsMessages for more details. These values can also be used within WndProc ref Message implementations when authoring classes that inherit from Control or Form objects in.

NET WinForms applications. Select "Edit This Page" on the right hand toolbar and edit it! Calling the CallNextHookEx function to chain to the next hook procedure is optional, but it is highly recommended; otherwise, other applications that have installed hooks will not receive hook notifications and may behave incorrectly as a result.

You should call CallNextHookEx unless you absolutely need to prevent the notification from being seen by other applications. Before terminating, an application must call the UnhookWindowsHookEx function to free system resources associated with the hook. The scope of a hook depends on the hook type. Some hooks can be set only with global scope; others can also be set for only a specific thread, as shown in the following table. For a specified hook type, thread hooks are called first, then global hooks.

For these hooks, it is possible that both the bit and bit hooks will be called if a bit hook is ahead of a bit hook in the hook chain. The global hooks are a shared resource, and installing one affects all applications in the same desktop as the calling thread.

All global hook functions must be in libraries. Global hooks should be restricted to special-purpose applications or to use as a development aid during application debugging. Libraries that no longer need a hook should remove its hook procedure. Windows Store app development If dwThreadId is zero, then window hook DLLs are not loaded in-process for the Windows Store app processes and the Windows Runtime broker process unless they are installed by either UIAccess processes accessibility tools.

The notification is delivered on the installer's thread for these hooks:. For an example, see Installing and Releasing Hook Procedures. The winuser. Mixing usage of the encoding-neutral alias with code that not encoding-neutral can lead to mismatches that result in compilation or runtime errors. For more information, see Conventions for Function Prototypes. Skip to main content. This browser is no longer supported.

Download Microsoft Edge More info. Contents Exit focus mode. SetWindowsHookExA function winuser. Please rate your experience Yes No. Any additional feedback? Note The winuser. In this article. Installs a hook procedure that monitors messages before the system sends them to the destination window procedure. MSDN article on hooks in. Select "Edit This Page" on the right hand toolbar and edit it!

Or add new pages containing supporting types needed for this API structures, delegates, and more. Create page. Type a page name and press Enter. You'll jump to the page if it exists, or you can create it if it doesn't. To create a page in a module other than user32, prefix the name with the module name and a period.

SetWindowsHookEx user Represents the method called when a hook catches a monitored event. Installs a hook to monitor certain types of events. Show Recent Changes. Subscribe RSS. Suggested Reading. Download Visual Studio Add-In.