C# HandleHelper 设置句柄显示状态、激活句柄、操作句柄获得键盘输入焦点

设置句柄显示状态、激活句柄、操作句柄获得键盘输入焦点

//SetFocus为指定的窗口设置键盘输入焦点
[DllImport("user32.dll", EntryPoint = "SetFocus")]
public static extern IntPtr SetFocus(IntPtr hWnd);

//SetForegroundWindow 把创建给定窗口的线程放到前台并激活该窗口
[DllImport("user32.dll", EntryPoint = "SetForegroundWindow")]
public static extern bool SetForegroundWindow(IntPtr hWnd);

//ShowWindowAsync 设置由不同线程创建的窗口显示状态
[DllImport("user32.dll", EntryPoint = "ShowWindowAsync")]
public static extern bool ShowWindowAsync(IntPtr hWnd, int nCmdShow);
//常量，隐藏
private const int SW_HIDE = 0;
//常量，显示，标准状态
private const int SW_SHOWNORMAL = 1;
//常量，显示，最小化
private const int SW_SHOWMINIMIZED = 2;
//常量，显示，最大化
private const int SW_SHOWMAXIMIZED = 3;
//常量，显示，不激活
private const int SW_SHOWNOACTIVATE = 4;
//常量，显示，回复原状
private const int SW_RESTORE = 9;
//常量，显示，默认
private const int SW_SHOWDEFAULT = 10;