修改任何窗口的透明度从C＃ [英] Modifying opacity of any window from C#

问题描述

是否有可能从C＃修改所有打开的窗口的透明度。我用Google搜索最小化的窗口，我才知道，它可能与PInvoke的电话。它甚至工作。同样是有可能从C＃所有打开的窗口的透明度改变？

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，我不是在为MFC东西。仍然是有任何工具就知道在一个dll公开的API列表？

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

您可以使用的 SetLayeredWindowAttributes API 这么做

选中此这个API的PInvoke的版本。

Check this for the pInvoke version of this API.

从上述链接示例代码：

[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);
}

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