VC 窗口透明化

最新推荐文章于 2023-05-30 15:02:30 发布

原创最新推荐文章于 2023-05-30 15:02:30 发布 · 711 阅读

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该博客介绍了如何使用Windows SDK中的SetLayeredWindowAttributes函数实现VC窗口的透明化效果，包括设置窗口的不透明度和透明色键。通过这个函数，可以成功地创建和管理具有透明特性的层叠窗口。

	//ModifyStyleEx(0, WS_EX_LAYERED|WS_EX_TRANSPARENT);  //窗口透明并且不接受鼠标消息
	ModifyStyleEx(0, WS_EX_LAYERED);  //窗口透明但接受鼠标消息
	SetLayeredWindowAttributes(0, 128, 2);  //第二个参数表示透明度
	//SetWindowPos(&CWnd::wndTopMost, 0, 0, 0, 0, SWP_NOSIZE|SWP_NOMOVE);

以下信息来自MSDN

CWnd::SetLayeredWindowAttributes

Sets the opacity and transparency color key of a layered window.

BOOL SetLayeredWindowAttributes(
   COLORREF crKey,
   BYTE bAlpha,
   DWORD dwFlags
);

BOOL SetLayeredWindowAttributes(
   COLORREF crKey,
   BYTE bAlpha,
   DWORD dwFlags
);

Parameters

crKey

Pointer to a COLORREF value 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

Alpha value used to describe the opacity of the layered window. For more information, see the SourceConstantAlpha member of the BLENDFUNCTION structure. When bAlpha is 0, the window is completely transparent. When bAlpha is 255, the window is opaque.

dwFlags

Specifies an action to take. This parameter can be one or more of the following values. For a list of possible values, see SetLayeredWindowAttributes.

Return Value

Nonzero if the function succeeds; otherwise 0.

Remarks

This member function emulates the functionality of the function SetLayeredWindowAttributes, as described in the Windows SDK.