WM_CREATE

The WM_CREATE message is sent when an application requests that a window be created by calling the CreateWindowEx or CreateWindow function. The window procedure of the new window receives this message after the window is created, but before the window becomes visible. The message is sent before the CreateWindowEx or CreateWindow function returns.

WM_CREATE 
lpcs = (LPCREATESTRUCT) lParam; // structure with creation data 
 

Parameters

lParam

Value of lParam. Pointer to a CREATESTRUCT structure that contains information about the window being created. The members of CREATESTRUCT are identical to the parameters of the CreateWindowEx function.

Return Values

If an application processes this message, it should return 0 to continue creation of the window. If the application returns –1, the window is destroyed and the CreateWindowEx or CreateWindow function returns a NULL handle.

QuickInfo

  Windows NT: Requires version 3.1 or later.
  Windows: Requires Windows 95 or later.
  Windows CE: Requires version 1.0 or later.
  Header: Declared in winuser.h.

See Also

Windows Overview, Window Messages, CreateWindow, CreateWindowEx, CREATESTRUCT, WM_NCCREATE