从 C# 修改任何窗口的不透明度 [英] Modifying opacity of any window from C#

问题描述

是否可以从 C# 修改所有打开的窗口的不透明度.我用谷歌搜索最小化窗口，我知道它可以通过 pInvoke 调用.它甚至奏效了.同样是否可以从 C# 更改所有打开的窗口的不透明度?

Is it possible to modify the opacity of all opened windows from C#. I googled for minimizing the windows and i came to know that its possible with pInvoke calls. It even worked. Similarly is it possible to change the opacity of all the opened windows from C#?

另外，我不喜欢 MFC 的东西.还有任何工具可以知道 dll 中公开的 api 列表吗?

Also, i am not in to MFC stuffs. Still is there any tools to know the list of apis exposed in a dll?

推荐答案

你可以使用SetLayeredWindowAttributes API 这样做.

检查此 API 的 pInvoke 版本.

Check this for the pInvoke version of this API.

来自上述链接的示例代码:

Sample Code from the above-mentioned link:

[DllImport("user32.dll")]
static extern bool SetLayeredWindowAttributes(IntPtr hwnd, uint crKey,byte bAlpha, uint dwFlags);

public const int GWL_EXSTYLE = -20;
public const int WS_EX_LAYERED = 0x80000;
public const int LWA_ALPHA = 0x2;
public const int LWA_COLORKEY = 0x1;

//set the window style to alpha appearance
private void button4_Click(object sender, EventArgs e)
{
    SetWindowLong(Handle, GWL_EXSTYLE, GetWindowLong(Handle, GWL_EXSTYLE) ^ WS_EX_LAYERED);
    SetLayeredWindowAttributes(Handle, 0, 128, LWA_ALPHA);
}

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