如何在Windows的桌面上绘制文本？ [英] How to draw text on the desktop in Windows?

问题描述

如何在Windows桌面上放置文本？有人告诉我，我需要GetDesktopWindow（），但我需要一个例子。

How Would I go about placing text on the windows desktop? I've been told that GetDesktopWindow() is what I need but I need an example.

推荐答案

我假设您的最终版本目标是在桌面上显示某种状态信息。

I'm assuming your ultimate goal is displaying some sort of status information on the desktop.

您将必须执行以下操作之一：

You will have to do either:

• 向Explorer的进程中注入一个DLL，并将其子类化为桌面窗口（在 Progman底部的 SysListView32 窗口的层次结构）直接在其上绘制文本。

• Inject a DLL into Explorer's process and subclass the desktop window (the SysListView32 at the bottom of the Progman window's hierarchy) to paint your text directly onto it.

创建一个不可激活的窗口，其背景使用 PaintDesktop绘制并在上面涂上文字。

Create a nonactivatable window whose background is painted using PaintDesktop and paint your text on it.

第一个解决方案是最具侵入性的，而且相当

First solution is the most intrusive, and quite hard to code, so I would not recommend it.

第二种解决方案可以提供最大的灵活性。没有未记录或依赖于Explorer的特定实现，甚至不依赖于Explorer作为外壳。

Second solution allows the most flexibility. No "undocumented" or reliance on a specific implementation of Explorer, or even of just having Explorer as a shell.

为了防止将窗口带到顶部单击后，可以在Windows 2000及更高版本上使用扩展的窗口样式 WS_EX_NOACTIVATE 。在下层系统上，您可以处理 WM_MOUSEACTIVATE 消息并返回 MA_NOACTIVATE 。

In order to prevent a window from being brought to the top when clicked, you can use the extended window style WS_EX_NOACTIVATE on Windows 2000 and up. On downlevel systems, you can handle the WM_MOUSEACTIVATE message and return MA_NOACTIVATE.

如果您需要使用分层窗口实现真正的透明性，则可以通过 PaintDesktop 调用来解决这个问题，但是这个概念保持不变。我写了另一个答案，详细说明了如何使用GDI +使用alpha正确地处理分层窗口。

You can get away with the PaintDesktop call if you need true transparency by using layered windows, but the concept stays the same. I wrote another answer detailing how to properly do layered windows with alpha using GDI+.

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