DwmGetWindowAttribute function (dwmapi.h)

Retrieves the current value of a specified Desktop Window Manager (DWM) attribute applied to a window. For programming guidance, and code examples, see Controlling non-client region rendering.

Syntax

HRESULT DwmGetWindowAttribute(
        HWND  hwnd,
        DWORD dwAttribute,
  [out] PVOID pvAttribute,
        DWORD cbAttribute
);

Parameters

hwnd

The handle to the window from which the attribute value is to be retrieved.

dwAttribute

A flag describing which value to retrieve, specified as a value of the DWMWINDOWATTRIBUTE enumeration. This parameter specifies which attribute to retrieve, and the pvAttribute parameter points to an object into which the attribute value is retrieved.

[out] pvAttribute

A pointer to a value which, when this function returns successfully, receives the current value of the attribute. The type of the retrieved value depends on the value of the dwAttribute parameter. The DWMWINDOWATTRIBUTE enumeration topic indicates, in the row for each flag, what type of value you should pass a pointer to in the pvAttribute parameter.

cbAttribute

The size, in bytes, of the attribute value being received via the pvAttribute parameter. The type of the retrieved value, and therefore its size in bytes, depends on the value of the dwAttribute parameter.

Return value

Type: HRESULT

If the function succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.

Requirements

See also

• DwmSetWindowAttribute function
• Enable and control DWM composition