WS_EX_LAYERED和WS_CHILD透明子窗口

问题描述

我已阅读有关此主题的其他帖子，并尝试了一切建议但没有成功。我发布这个是希望有人有一小段代码，如实际工作的波纹管。

I have read other posts on this topic and tried everything suggested to no success. I am posting this in the hope that someone has a small piece of code like the bellow that actually works.

根据这里  http：//msdn.microsoft.com/en-gb / library / windows / desktop / ff700543（v = vs.85）.aspx

According to here http://msdn.microsoft.com/en-gb/library/windows/desktop/ff700543(v=vs.85).aspx

WS_EX_LAYERED： 

WS_EX_LAYERED : 

该窗口是  分层
窗口。如果窗口具有  类
样式  CS_OWNDC  或 CS_CLASSDC 。

The window is a layered window. This style cannot be used if the window has a class style of either CS_OWNDC or CS_CLASSDC.

Windows  8：   顶级窗口和子窗口支持 WS_EX_LAYERED 风格。以前的Windows版本仅支持顶级窗口 WS_EX_LAYERED 。

Windows 8:  The WS_EX_LAYERED style is supported for top-level windows and child windows. Previous Windows versions supportWS_EX_LAYERED only for top-level windows.

因此，鉴于我在Windows 8.1机器上，我希望以下代码能够正常工作。但它无法创建窗口，也没有说明原因。我假设我正在做一些愚蠢的事情，或者还有其他的"魔法"。我必须设置或不设置的标志
设置为使其工作。

So, given that I am on a Windows 8.1 box I would expect the following code to work. But it fails to create the window and gives no indication of why. I am assuming I am doing something dumb or there are other "magic" flags that I have to set or not set to get this to work.

	WNDCLASSEX	winClass;

	ZeroMemory( &winClass, sizeof( winClass ) );

	winClass.lpszClassName = L"FOO";
	winClass.cbSize        = sizeof(WNDCLASSEX);
	winClass.style         = CS_GLOBALCLASS | CS_DBLCLKS;
	winClass.lpfnWndProc   = WindowProc;                  // Assume this function exists and works

	RegisterClassEx( &winClass );   // This works find

	HWND parentHWnd = // Get this from somewhere, elided but assume it's a normal top level window

	HWND childHWnd = CreateWindowEx(
        WS_EX_LAYERED,
            L"FOO",        // Class name registered above
	    L"SAD_WINDOW",
	    WS_CHILD | WS_VISIBLE,
	    0, 0,
	    300, 300,
	    parentHWnd,
	    0,
	    0,
	    0 );

	if( childHWnd == nullptr )
	{
            DWORD error = GetLastError( );   // This return 0 - Not so helpful!
	}

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