我们曾经想过能够在我们的计算机上将窗口隐蔽起来，不想被从身边走过的老板看见。尝试便捷的Windows隐藏并定义热键来控制它们。下面我们将演示如何通过热键，我们将会用到DllImports of Win32 API、CallBacks/Delegates，定制事件与事件的句柄。
using System;
using System.Text;
using System.Collections;
using System.Runtime.InteropServices; namespace WindowHider
{
///
/// Object used to control a Windows Form.
///
public class Window
{
///
/// Win32 API Imports
///
[DllImport("user32.dll")] private static extern
bool ShowWindowAsync(IntPtr hWnd, int nCmdShow);
[DllImport("user32.dll")] private static extern
bool SetForegroundWindow(IntPtr hWnd);
[DllImport("user32.dll")] private static extern
bool IsIconic(IntPtr hWnd);
[DllImport("user32.dll")] private static extern
bool IsZoomed(IntPtr hWnd);
[DllImport("user32.dll")] private static extern
IntPtr GetForegroundWindow();
[DllImport("user32.dll")] private static extern
IntPtr GetWindowThreadProcessId(IntPtr hWnd, IntPtr ProcessId);
[DllImport("user32.dll")] private static extern
IntPtr AttachThreadInput(IntPtr idAttach, IntPtr idAttachTo, int fAttach); ///
/// Win32 API Constants for ShowWindowAsync()
///
private const int SW_HIDE = 0;
private const int SW_SHOWNORMAL = 1;
private const int SW_SHOWMINIMIZED = 2;
private const int SW_SHOWMAXIMIZED = 3;
private const int SW_SHOWNOACTIVATE = 4;
private const int SW_RESTORE = 9;
private const int SW_SHOWDEFAULT = 10; ///
/// Private Fields
///
private IntPtr m_hWnd;
private string m_Title;
private bool m_Visible = true;
private string m_Process;
private bool m_WasMax = false; ///
/// Window Object's Public Properties
///
public IntPtr hWnd
{
get{return m_hWnd;}
}
public string Title
{
get{return m_Title;}
}
public string Process
{
get{return m_Process;}
} ///
/// Sets this Window Object's visibility
///
public bool Visible
{
get{return m_Visible;}
set
{
//show the window
if(value == true)
{
if(m_WasMax)
{
if(ShowWindowAsync(m_hWnd,SW_SHOWMAXIMIZED))
m_Visible = true;
}
else
{
if(ShowWindowAsync(m_hWnd,SW_SHOWNORMAL))
m_Visible = true;
}
}
//hide the window
if(value == false)
{
m_WasMax = IsZoomed(m_hWnd);
if(ShowWindowAsync(m_hWnd,SW_HIDE))
m_Visible = false;
}
}
} ///
/// Constructs a Window Object
///
/// Title Caption
/// Handle
/// Owning Process
public Window(string Title, IntPtr hWnd, string Process)
{
m_Title = Title;
m_hWnd = hWnd;
m_Process = Process;
} //Override ToString()
public override string ToString()
{
//return the title if it has one, if not return the process name
if (m_Title.Length > 0)
{
return m_Title;
}
else
{
return m_Process;
}
} ///
/// Sets focus to this Window Object
///
public void Activate()
{
if(m_hWnd == GetForegroundWindow())
return; IntPtr ThreadID1 = GetWindowThreadProcessId(GetForegroundWindow(),
IntPtr.Zero);
IntPtr ThreadID2 = GetWindowThreadProcessId(m_hWnd,IntPtr.Zero); if (ThreadID1 != ThreadID2)
{
AttachThreadInput(ThreadID1,ThreadID2,1);
SetForegroundWindow(m_hWnd);
AttachThreadInput(ThreadID1,ThreadID2,0);
}
else
{
SetForegroundWindow(m_hWnd);
} if (IsIconic(m_hWnd))
{
ShowWindowAsync(m_hWnd,SW_RESTORE);
}
else
{
ShowWindowAsync(m_hWnd,SW_SHOWNORMAL);
}
}
} ///
/// Collection used to enumerate Window Objects
///
public class Windows : IEnumerable, IEnumerator
{
///
/// Win32 API Imports
///
[DllImport("user32.dll")] private static extern
int GetWindowText(int hWnd, StringBuilder title, int size);
[DllImport("user32.dll")] private static extern
int GetWindowModuleFileName(int hWnd, StringBuilder title, int size);
[DllImport("user32.dll")] private static extern
int EnumWindows(EnumWindowsProc ewp, int lParam);
[DllImport("user32.dll")] private static extern
bool IsWindowVisible(int hWnd); //delegate used for EnumWindows() callback function
public delegate bool EnumWindowsProc(int hWnd, int lParam); private int m_Position = -1; // holds current index of wndArray,
// necessary for IEnumerable ArrayList wndArray = new ArrayList(); //array of windows
//Object's private fields
private bool m_invisible = false;
private bool m_notitle = false; ///
/// Collection Constructor with additional options
///
/// Include invisible Windows
/// Include untitled Windows
public Windows(bool Invisible, bool Untitled)
{
m_invisible = Invisible;
m_notitle = Untitled; //Declare a callback delegate for EnumWindows() API call
EnumWindowsProc ewp = new EnumWindowsProc(EvalWindow);
//Enumerate all Windows
EnumWindows(ewp, 0);
}
///
/// Collection Constructor
///
public Windows()
{
//Declare a callback delegate for EnumWindows() API call
EnumWindowsProc ewp = new EnumWindowsProc(EvalWindow);
//Enumerate all Windows
EnumWindows(ewp, 0);
}
//EnumWindows CALLBACK function
private bool EvalWindow(int hWnd, int lParam)
{
if (m_invisible == false && !IsWindowVisible(hWnd))
return(true); StringBuilder title = new StringBuilder(256);
StringBuilder module = new StringBuilder(256); GetWindowModuleFileName(hWnd, module, 256);
GetWindowText(hWnd, title, 256); if (m_notitle == false && title.Length == 0)
return(true); wndArray.Add(new Window(title.ToString(), (IntPtr)hWnd,
module.ToString())); return(true);
} //implement IEnumerable
public IEnumerator GetEnumerator()
{
return (IEnumerator)this;
}
//implement IEnumerator
public bool MoveNext()
{
m_Position++;
if (m_Position < wndArray.Count)
{
return true;
}
else
{
return false;
}
}
public void Reset()
{
m_Position = -1;
}
public object Current
{
get
{
return wndArray[m_Position];
}
}
}
}
