windows 从 C# 修改任何窗口的不透明度
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Modifying opacity of any window from C#
提问by sudarsanyes
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#?
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，我开始知道 pInvoke 调用是可能的。它甚至起作用了。同样，是否可以从 C# 更改所有打开的窗口的不透明度？
Also, i am not in to MFC stuffs. Still is there any tools to know the list of apis exposed in a dll?
另外，我不喜欢 MFC 的东西。仍然有任何工具可以了解 dll 中公开的 api 列表吗？
回答by Aamir
You can use SetLayeredWindowAttributes APIto do so.
您可以使用SetLayeredWindowAttributes API来执行此操作。
Check thisfor the pInvoke version of this API.
检查此 API 的 pInvoke 版本。
Sample Code from the above-mentioned link:
来自上述链接的示例代码：
[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);
}
