User32SetLayeredWindowAttributes(IntPtr, UInt32, Int32, LayeredWindowAttributesFlags) Method

[DllImportAttribute("User32.dll", SetLastError = true)]
public static bool SetLayeredWindowAttributes(
	IntPtr hWnd,
	uint crKey,
	int bAlpha,
	LayeredWindowAttributesFlags flags
)

<DllImportAttribute("User32.dll", SetLastError := true>]
Public Shared Function SetLayeredWindowAttributes ( 
	hWnd As IntPtr,
	crKey As UInteger,
	bAlpha As Integer,
	flags As LayeredWindowAttributesFlags
) As Boolean

Dim hWnd As IntPtr
Dim crKey As UInteger
Dim bAlpha As Integer
Dim flags As LayeredWindowAttributesFlags

Dim returnValue As Boolean

returnValue = User32.SetLayeredWindowAttributes(hWnd, 
	crKey, bAlpha, flags)

public:
[DllImportAttribute(L"User32.dll", SetLastError = true)]
static bool SetLayeredWindowAttributes(
	IntPtr hWnd, 
	unsigned int crKey, 
	int bAlpha, 
	LayeredWindowAttributesFlags flags
)

[<DllImportAttribute("User32.dll", SetLastError = true)>]
static member SetLayeredWindowAttributes : 
        hWnd : IntPtr * 
        crKey : uint32 * 
        bAlpha : int * 
        flags : LayeredWindowAttributesFlags -> bool 

No code example is currently available or this language may not be supported.

Parameters

hWnd  IntPtr

A handle to the layered window.

A layered window is created by specifying Layered when creating the window with the CreateWindowEx function or by setting Layered via SetWindowLongPtr(IntPtr, WindowLongValues, IntPtr) function. after the window has been created.

crKey  UInt32

A COLORREF structure that specifies the transparency color key to be used when composing the layered window.

All pixels painted by the window in this color will be transparent. To generate a COLORREF, use the RGB macro.

bAlpha  Int32

Alpha value used to describe the opacity of the layered window.

When bAlpha is 0, the window is completely transparent.

When bAlpha is 255, the window is opaque.

flags  LayeredWindowAttributesFlags

An action to be taken.

Return Value

If the function fails, the return value .

To get extended error information, call GetLastWin32Error.

Reference