WindowProc.md

Home

Function name : WindowProc

Group: Window Procedure - Library: kernel32

---

The WindowProc function is an application-defined function that processes messages sent to a window. The WNDPROC type defines a pointer to this callback function. WindowProc is a placeholder for the application-defined function name.

---

Code examples:

Dragging files from Explorer window and dropping them on FoxPro control (requires VFP9)
How to block the PrintScreen key
Adding user-defined items to the Control Menu of VFP form (requires VFP9)

Declaration:

LRESULT CALLBACK WindowProc(
  HWND hwnd,      // handle to window
  UINT uMsg,      // message identifier
  WPARAM wParam,  // first message parameter
  LPARAM lParam   // second message parameter
);  

---

FoxPro declaration:

No VFP declaration available  

---

Parameters:

hwnd [in] Handle to the window.

uMsg [in] Specifies the message.

wParam [in] Specifies additional message information.

lParam [in] Specifies additional message information.

---

Return value:

The return value is the result of the message processing and depends on the message sent.

---