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Visual Basic 6 definition

Declare Function CreateWindowEx Lib "user32.dll" Alias "CreateWindowExA" (ByVal dwExStyle As Long, ByVal lpClassName As String, ByVal lpWindowName As String, ByVal dwStyle As Long, ByVal x As Long, ByVal y As Long, ByVal nWidth As Long, ByVal nHeight As Long, ByVal hWndParent As Long, ByVal hMenu As Long, ByVal hInstance As Long, lpParam As Any) As Long

Visual Basic .NET definition

Declare Function CreateWindowEx Lib "user32" Alias "CreateWindowExA" (ByVal dwExStyle As Integer, ByVal lpClassName As String, ByVal lpWindowName As String, ByVal dwStyle As Integer, ByVal x As Integer, ByVal y As Integer, ByVal nWidth As Integer, ByVal nHeight As Integer, ByVal hwndParent As Integer, ByVal hMenu As Integer, ByVal hInstance As Integer, ByRef lpParam As Object) As Integer

Description

CreateWindowEx creates a new window. The window can be a "regular" (overlapped) window, a control on another window, or a popup window. CreateWindowEx Creates an overlapped, pop-up, or child window with an extended window style. System.Windows.Forms.Form constructor

Return Value

If successful, the function returns a handle to the newly created window. If an error occured, the function returns zero (use GetLastError to get the error code).

Parameters

dwExStyle A combination of extended styles to give the window. lpClassName The name of the class to create the window using. This class must have previously been registered using RegisterClassEx, InitCommonControlsEx, or some other function that registers window classes. lpWindowName The name to give the newly created window. For controls, this text will be the initial content of the control. For regular windows, this text appears in the window's title bar. dwStyle A combination of the window styles to give the window. This is normally a combination of base window styles and styles that are specific to the window's class. x The initial x-coordinate of the upper-left corner of the window to create. If this window is a child of another window, this coordinate is relative to its parent window, otherwise it is relative to the screen. If this is CW_USEDEFAULT (for an overlapped window only), y will be ignored and the window will be placed in a default position. y The initial y-coordinate of the upper-left corner of the window to create. It is interpreted in the same way as x. This parameter is ignored if x is set to CW_USEDEFAULT. nWidth The initial width of the window. If this is CW_USEDEFAULT (for overlapped windows only), nHeight will be ignored and the window will be given a default size. nHeight The initial height of the window. If x is set to CW_USEDEFAULT, this parameter will be ignored. hWndParent A handle to the parent of the window to create. If the window does not have a parent, this should be zero. Windows 2000: Set this parameter to HWND_MESSAGE to create a message-only window. hMenu A handle to a menu to assign to the window. For child windows, this is the child-window identifier, used to notify its parent about events. To not give the window a menu, set this parameter to zero. hInstance A handle to the instance of the module or program that owns the window. lParam An additional value to associate with the window, used in the window creation messages.

Constants

Const CW_USEDEFAULT = &H80000000 Const HWND_BROADCAST = &HFFFF

Further Information:

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Visual Basic 6 example source code

Visual Basic .NET example source code

C# example source code
[DllImport("user32", EntryPoint="CreateWindowEx")] public static extern int CreateWindowExA(long dwExStyle, string lpClassName, string lpWindowName, long dwStyle, int x, int y, int nWidth, int nHeight, int hwndParent, int hMenu, int hInstance, long lpParam);

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