此处（在示例程序下方）是否调整了记事本的大小->最大化然后最小化。窗口位置（最大化）不会保留。
我想在最小化之前保持窗口位置不变。
我已经尝试了下面的代码。请帮助。
公共部分类Form1：表单{public Form1（）{InitializeComponent（）; }
private readonly IntPtr HWND_TOPMOST = new IntPtr(0);
private void button1_Click(object sender, EventArgs e)
{
Process[] Processes = Process.GetProcessesByName("notepad");
string processString = string.Format("Untitled - Notepad");
IntPtr res;
foreach (Process theprocess in Processes)
{
if (theprocess.MainWindowTitle.Contains(processString))
{
if (theprocess.MainWindowHandle == IntPtr.Zero)
{
continue;
}
WindowsNativeCalls.SetActiveWindow(theprocess.MainWindowHandle);
if (theprocess.MainWindowHandle != IntPtr.Zero)
{
if (theprocess.MainWindowTitle.Contains(processString))
{
WindowsNativeCalls.WINDOWPLACEMENT placement = new WindowsNativeCalls.WINDOWPLACEMENT();
WindowsNativeCalls.GetWindowPlacement(theprocess.MainWindowHandle, ref placement);
switch (placement.showCmd)
{
case 1:// SW_NORMAL
case 3:// SW_MAXIMIZE does the job of bring to front
WindowsNativeCalls.SetWindowPos(theprocess.MainWindowHandle, HWND_TOPMOST, 0, 0, 0, 0, WindowsNativeCalls.SWP_NOMOVE | WindowsNativeCalls.SWP_NOSIZE | WindowsNativeCalls.SWP_SHOWWINDOW);
break;
case 2: // SW_SHOWMINIMIZED
placement.showCmd = 9;
WindowsNativeCalls.SetWindowPlacement(theprocess.MainWindowHandle, ref placement);
//res = WindowsNativeCalls.SendMessage(theprocess.MainWindowHandle, WindowsNativeCalls.WM_SYSCOMMAND, (IntPtr)WindowsNativeCalls.SW_SHOWNORMAL, IntPtr.Zero);
break;
}
}
}
}
}
}
}
公共类WindowsNativeCalls {#region字段
/// <summary>
/// Hide Window
/// </summary>
public const int SW_HIDE = 0;
/// <summary>
/// Show Normal
/// </summary>
public const int SW_SHOWNORMAL = 1;
/// <summary>
/// Minimize Window
/// </summary>
public const int SW_SHOWMINIMIZED = 2;
/// <summary>
/// Maxiize Window
/// </summary>
public const int SW_SHOWMAXIMIZED = 3;
/// <summary>
/// Activate Window
/// </summary>
public const int SW_SHOWNOACTIVATE = 4;
/// <summary>
/// Restore Window
/// </summary>
public const int SW_RESTORE = 9;
/// <summary>
/// SW_SHOW
/// </summary>
public const int SW_SHOW = 5;
/// <summary>
/// Default Window
/// </summary>
public const int SW_SHOWDEFAULT = 10;
/// <summary>
/// Close Windows message
/// </summary>
public const uint WM_CLOSE = 0x10;
/// <summary>
/// Screen Window Position to No Size Change
/// </summary>
public const UInt32 SWP_NOSIZE = 0x0001;
/// <summary>
/// Screen Window Position to No Move Change
/// </summary>
public const UInt32 SWP_NOMOVE = 0x0002;
/// <summary>
/// Screen Window Position to Show Window
/// </summary>
public const UInt32 SWP_SHOWWINDOW = 0x0040;
/// <summary>
/// Maximize Window in Graphics mode
/// </summary>
public const int SC_MAXIMIZE = 0xF030;
/// <summary>
/// Resize Windows message
/// </summary>
public const uint WM_SYSCOMMAND = 0x0112;
public struct POINTAPI
{
public int x;
public int y;
}
public struct RECT
{
public int left;
public int top;
public int right;
public int bottom;
}
public struct WINDOWPLACEMENT
{
public int length;
public int flags;
public int showCmd;
public POINTAPI ptMinPosition;
public POINTAPI ptMaxPosition;
public RECT rcNormalPosition;
}
#endregion
#region DllImport Functions
/// <summary>
/// Sets the show state of a window created.
/// </summary>
/// <param name="hWnd">Window Handle</param>
/// <param name="nCmdShow">Show state</param>
/// <returns>Returns True if successful</returns>
[DllImport("user32.dll")]
public static extern bool ShowWindowAsync(IntPtr hWnd, int nCmdShow);
/// <summary>
/// Sets window in Forefront and activates it
/// </summary>
/// <param name="hWnd">Window Handle</param>
/// <returns>Returns True if successfu</returns>
[DllImport("user32.dll")]
public static extern bool SetForegroundWindow(IntPtr hWnd);
/// <summary>
/// Sets the show state of a window created.
/// </summary>
/// <param name="hWnd">Window Handle</param>
/// <param name="nCmdShow">Show state</param>
/// <returns>Returns True if successful</returns>
[DllImport("user32.dll")]
public static extern bool ShowWindow(IntPtr hWnd, int nCmdShow);
[DllImport("user32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
public static extern bool GetWindowPlacement(IntPtr hWnd, ref WINDOWPLACEMENT lpwndpl);
[DllImport("user32.dll", SetLastError = true)]
public static extern IntPtr FindWindow(string lpClassName, string lpWindowName);
[DllImport("user32.dll")]
public static extern bool SetWindowPlacement(IntPtr hWnd, ref WINDOWPLACEMENT lpwndpl);
[DllImport("user32.dll")]
public static extern IntPtr GetForegroundWindow();
[DllImport("user32.dll")]
public static extern int GetWindowText(IntPtr hWnd, System.Text.StringBuilder text, int count);
[DllImport("user32.dll")]
public static extern bool IsIconic(IntPtr hWnd);
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = false)]
public static extern IntPtr SendMessage(IntPtr hWnd, UInt32 Msg, IntPtr wParam, IntPtr lParam);
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
public static extern bool EnumWindows(EnumedWindow lpEnumFunc, ArrayList lParam);
public delegate bool EnumedWindow(IntPtr handleWindow, ArrayList handles);
[DllImport("user32")]
[return: MarshalAs(UnmanagedType.Bool)]
public static extern bool EnumChildWindows(IntPtr window, EnumedWindow callback, ArrayList lParam);
[DllImport("user32.dll")]
public static extern bool SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int X, int Y, int cx, int cy, uint uFlags);
[DllImport("user32.dll", SetLastError = true)]
public static extern IntPtr SetActiveWindow(IntPtr hWnd);
[StructLayout(LayoutKind.Sequential)]
public struct WINDOWINFO
{
public uint cbSize;
public RECT rcWindow;
public RECT rcClient;
public uint dwStyle;
public uint dwExStyle;
public uint dwWindowStatus;
public uint cxWindowBorders;
public uint cyWindowBorders;
public ushort atomWindowType;
public ushort wCreatorVersion;
public WINDOWINFO(Boolean? filler)
: this()
{
cbSize = (UInt32)(Marshal.SizeOf(typeof(WINDOWINFO)));
}
}
[DllImport("user32.dll", SetLastError = true)]
public static extern bool GetWindowInfo(IntPtr hwnd, ref WINDOWINFO pwi);
#endregion
}
如果您希望窗口使用其先前位置，请不要通过调用覆盖窗口位置信息SetWindowPos()。
相反，只需通过ShowWindow()使用适当的命令（即SW_MINIMIZE）进行调用来最小化窗口。然后，当您还原它时，它的先前位置信息将仍然存在。
<aside>
顺便说一句，您的代码有两次检查窗口句柄null和窗口标题的特殊原因是什么？</ aside>
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