关于windows:Win32API使用技巧-置顶应用

Win32 提供了 SetForegroundWindow 办法能够将利用设置到前台并激活，然而在某些场景下，只调用该接口会返回 0，即设置失败。比方如下场景：

以后前台利用为一个全屏的利用，非前台利用的过程应用 Process.Start() 办法启动截图工具，尝试应用 SetForegroundWindow() 将窗口设置到前台，此时会概率性设置失败。

尝试了多种办法后，最终应用如下办法解决了该问题：

public static readonly IntPtr HWND_TOPMOST = new IntPtr(-1);
public static readonly IntPtr HWND_NOTOPMOST = new IntPtr(-2);
public const int SWP_NOSIZE = 0x1;
public const int SWP_NOMOVE = 0x2;

[DllImport("user32.dll")]
public static extern IntPtr GetForegroundWindow();

[DllImport("user32.dll")]
public static extern bool SetForegroundWindow(IntPtr hwnd);

[DllImport("user32.dll")]
public static extern IntPtr FindWindow(string lpClassName, string lpWindowName);

[DllImport("user32.dll")]
public static extern bool SetWindowPos(IntPtr hwnd, IntPtr hWndInsertAfter, int x, int y, int cx, int cy, uint uFlags);

public void StartSnippingTool()
{if (!Envronment.Is64BitProcess)
    {Process.Start(@"C:\Windows\sysnative\SnippingTool.exe");
    }
    else
    {Process.Start(@"C:\Windows\system32\SnippingTool.exe");
    }

    Thread.Sleep(500);
    IntPtr snippingToolHandle = FindWindow("Microsoft-Windows-SnipperToolbar", "截图工具");
    if (snippingToolHandle != IntPtr.Zero)
    {SetForegroundWindowCustom(snippingToolHandle);
    }
}

private void SetForegroundWindowCustom(IntPtr hwnd)
{IntPtr currentWindow = GetForegroundWindow();
    if (currentWindow == hwnd)
    {Console.WriteLine("利用已在顶层");
        return;
    }

    SetWindowPos(hwnd, HWND_TOPMOST, 0, 0, 0, 0, SWP_NOSIZE|SWP_NOMOVE);
    SetWindowPos(hwnd, HWND_NOTOPMOST, 0, 0, 0, 0, SWP_NOSIZE|SWP_NOMOVE);

    bool result = SetForegroundWindow(hwnd);
    if (result)
    {Console.WriteLine("置顶利用胜利");
    }
    else
    {Console.WriteLine("置顶利用失败");
    }
}