问题
I am trying to use The SendInput API to automatically press a key repeatedly in a game WITHOUT having to use delays. I want the key presses to be as quick as possible, so I'd like to stay away from using delays like the Task.Delay or Thread.Sleep methods.
Focus on the Strum method.
The code below will press the right SHIFT key 18 times whenever the user uses the Ctrl + B hot key.
using System;
using System.Runtime.InteropServices;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace Guitar_Hero_Strumming
{
public partial class GHSForm : Form
{
public GHSForm()
{
InitializeComponent();
}
private static async void Strum()
{
for (var i = 0; i < 18; i++)
{
var nInputs = new[]
{
new INPUT
{
type = InputType.KEYBOARD,
U =
{
ki =
{
wScan = ScanCodeShort.RSHIFT
}
}
}
};
SendInput((uint)nInputs.Length, nInputs, INPUT.Size);
await Task.Delay(1);
nInputs = new[]
{
new INPUT
{
type = InputType.KEYBOARD,
U =
{
ki =
{
wScan = ScanCodeShort.RSHIFT,
dwFlags = KEYEVENTF.KEYUP
}
}
}
};
SendInput((uint)nInputs.Length, nInputs, INPUT.Size);
await Task.Delay(1);
}
}
[DllImport("user32.dll")]
private static extern bool RegisterHotKey(IntPtr hWnd, int id, int fsModifiers, int vk);
[DllImport("user32.dll")]
private static extern bool UnregisterHotKey(IntPtr hWnd, int id);
private const int ModControl = 0x0002;
private const int WmHotkey = 0x0312;
private void GHSForm_Load(object sender, EventArgs e)
{
RegisterHotKey(Handle, 1, ModControl, (int)Keys.B);
}
private void GHSForm_FormClosing(object sender, FormClosingEventArgs e)
{
UnregisterHotKey(Handle, 1);
}
protected override void WndProc(ref Message m)
{
if (m.Msg == WmHotkey && (int)m.WParam == 1)
{
Strum();
}
base.WndProc(ref m);
}
[DllImport("user32.dll")]
internal static extern uint SendInput(uint nInputs,
[MarshalAs(UnmanagedType.LPArray), In] INPUT[] pInputs,
int cbSize);
[StructLayout(LayoutKind.Sequential)]
public struct INPUT
{
internal InputType type;
internal InputUnion U;
internal static int Size
{
get { return Marshal.SizeOf(typeof(INPUT)); }
}
}
internal enum InputType : uint
{
MOUSE = 0,
KEYBOARD = 1,
HARDWARE = 2
}
[StructLayout(LayoutKind.Explicit)]
internal struct InputUnion
{
[FieldOffset(0)]
internal MOUSEINPUT mi;
[FieldOffset(0)]
internal KEYBDINPUT ki;
[FieldOffset(0)]
internal HARDWAREINPUT hi;
}
[StructLayout(LayoutKind.Sequential)]
internal struct MOUSEINPUT
{
internal int dx;
internal int dy;
internal int mouseData;
internal MOUSEEVENTF dwFlags;
internal uint time;
internal UIntPtr dwExtraInfo;
}
[StructLayout(LayoutKind.Sequential)]
internal struct KEYBDINPUT
{
internal VirtualKeyShort wVk;
internal ScanCodeShort wScan;
internal KEYEVENTF dwFlags;
internal int time;
internal UIntPtr dwExtraInfo;
}
[StructLayout(LayoutKind.Sequential)]
internal struct HARDWAREINPUT
{
internal int uMsg;
internal short wParamL;
internal short wParamH;
}
[Flags]
internal enum MOUSEEVENTF : uint
{
ABSOLUTE = 0x8000,
HWHEEL = 0x01000,
MOVE = 0x0001,
MOVE_NOCOALESCE = 0x2000,
LEFTDOWN = 0x0002,
LEFTUP = 0x0004,
RIGHTDOWN = 0x0008,
RIGHTUP = 0x0010,
MIDDLEDOWN = 0x0020,
MIDDLEUP = 0x0040,
VIRTUALDESK = 0x4000,
WHEEL = 0x0800,
XDOWN = 0x0080,
XUP = 0x0100
}
[Flags]
internal enum KEYEVENTF : uint
{
EXTENDEDKEY = 0x0001,
KEYUP = 0x0002,
SCANCODE = 0x0008,
UNICODE = 0x0004
}
internal enum VirtualKeyShort : short
{
LBUTTON = 0x01,
RBUTTON = 0x02,
CANCEL = 0x03,
MBUTTON = 0x04,
XBUTTON1 = 0x05,
XBUTTON2 = 0x06,
BACK = 0x08,
TAB = 0x09,
CLEAR = 0x0C,
RETURN = 0x0D,
SHIFT = 0x10,
CONTROL = 0x11,
MENU = 0x12,
PAUSE = 0x13,
CAPITAL = 0x14,
KANA = 0x15,
HANGUL = 0x15,
JUNJA = 0x17,
FINAL = 0x18,
HANJA = 0x19,
KANJI = 0x19,
ESCAPE = 0x1B,
CONVERT = 0x1C,
NONCONVERT = 0x1D,
ACCEPT = 0x1E,
MODECHANGE = 0x1F,
SPACE = 0x20,
PRIOR = 0x21,
NEXT = 0x22,
END = 0x23,
HOME = 0x24,
LEFT = 0x25,
UP = 0x26,
RIGHT = 0x27,
DOWN = 0x28,
SELECT = 0x29,
PRINT = 0x2A,
EXECUTE = 0x2B,
SNAPSHOT = 0x2C,
INSERT = 0x2D,
DELETE = 0x2E,
HELP = 0x2F,
KEY_0 = 0x30,
KEY_1 = 0x31,
KEY_2 = 0x32,
KEY_3 = 0x33,
KEY_4 = 0x34,
KEY_5 = 0x35,
KEY_6 = 0x36,
KEY_7 = 0x37,
KEY_8 = 0x38,
KEY_9 = 0x39,
KEY_A = 0x41,
KEY_B = 0x42,
KEY_C = 0x43,
KEY_D = 0x44,
KEY_E = 0x45,
KEY_F = 0x46,
KEY_G = 0x47,
KEY_H = 0x48,
KEY_I = 0x49,
KEY_J = 0x4A,
KEY_K = 0x4B,
KEY_L = 0x4C,
KEY_M = 0x4D,
KEY_N = 0x4E,
KEY_O = 0x4F,
KEY_P = 0x50,
KEY_Q = 0x51,
KEY_R = 0x52,
KEY_S = 0x53,
KEY_T = 0x54,
KEY_U = 0x55,
KEY_V = 0x56,
KEY_W = 0x57,
KEY_X = 0x58,
KEY_Y = 0x59,
KEY_Z = 0x5A,
LWIN = 0x5B,
RWIN = 0x5C,
APPS = 0x5D,
SLEEP = 0x5F,
NUMPAD0 = 0x60,
NUMPAD1 = 0x61,
NUMPAD2 = 0x62,
NUMPAD3 = 0x63,
NUMPAD4 = 0x64,
NUMPAD5 = 0x65,
NUMPAD6 = 0x66,
NUMPAD7 = 0x67,
NUMPAD8 = 0x68,
NUMPAD9 = 0x69,
MULTIPLY = 0x6A,
ADD = 0x6B,
SEPARATOR = 0x6C,
SUBTRACT = 0x6D,
DECIMAL = 0x6E,
DIVIDE = 0x6F,
F1 = 0x70,
F2 = 0x71,
F3 = 0x72,
F4 = 0x73,
F5 = 0x74,
F6 = 0x75,
F7 = 0x76,
F8 = 0x77,
F9 = 0x78,
F10 = 0x79,
F11 = 0x7A,
F12 = 0x7B,
F13 = 0x7C,
F14 = 0x7D,
F15 = 0x7E,
F16 = 0x7F,
F17 = 0x80,
F18 = 0x81,
F19 = 0x82,
F20 = 0x83,
F21 = 0x84,
F22 = 0x85,
F23 = 0x86,
F24 = 0x87,
NUMLOCK = 0x90,
SCROLL = 0x91,
LSHIFT = 0xA0,
RSHIFT = 0xA1,
LCONTROL = 0xA2,
RCONTROL = 0xA3,
LMENU = 0xA4,
RMENU = 0xA5,
BROWSER_BACK = 0xA6,
BROWSER_FORWARD = 0xA7,
BROWSER_REFRESH = 0xA8,
BROWSER_STOP = 0xA9,
BROWSER_SEARCH = 0xAA,
BROWSER_FAVORITES = 0xAB,
BROWSER_HOME = 0xAC,
VOLUME_MUTE = 0xAD,
VOLUME_DOWN = 0xAE,
VOLUME_UP = 0xAF,
MEDIA_NEXT_TRACK = 0xB0,
MEDIA_PREV_TRACK = 0xB1,
MEDIA_STOP = 0xB2,
MEDIA_PLAY_PAUSE = 0xB3,
LAUNCH_MAIL = 0xB4,
LAUNCH_MEDIA_SELECT = 0xB5,
LAUNCH_APP1 = 0xB6,
LAUNCH_APP2 = 0xB7,
OEM_1 = 0xBA,
OEM_PLUS = 0xBB,
OEM_COMMA = 0xBC,
OEM_MINUS = 0xBD,
OEM_PERIOD = 0xBE,
OEM_2 = 0xBF,
OEM_3 = 0xC0,
OEM_4 = 0xDB,
OEM_5 = 0xDC,
OEM_6 = 0xDD,
OEM_7 = 0xDE,
OEM_8 = 0xDF,
OEM_102 = 0xE2,
PROCESSKEY = 0xE5,
PACKET = 0xE7,
ATTN = 0xF6,
CRSEL = 0xF7,
EXSEL = 0xF8,
EREOF = 0xF9,
PLAY = 0xFA,
ZOOM = 0xFB,
NONAME = 0xFC,
PA1 = 0xFD,
OEM_CLEAR = 0xFE
}
internal enum ScanCodeShort : short
{
LBUTTON = 0,
RBUTTON = 0,
CANCEL = 70,
MBUTTON = 0,
XBUTTON1 = 0,
XBUTTON2 = 0,
BACK = 14,
TAB = 15,
CLEAR = 76,
RETURN = 28,
SHIFT = 42,
CONTROL = 29,
MENU = 56,
PAUSE = 0,
CAPITAL = 58,
KANA = 0,
HANGUL = 0,
JUNJA = 0,
FINAL = 0,
HANJA = 0,
KANJI = 0,
ESCAPE = 1,
CONVERT = 0,
NONCONVERT = 0,
ACCEPT = 0,
MODECHANGE = 0,
SPACE = 57,
PRIOR = 73,
NEXT = 81,
END = 79,
HOME = 71,
LEFT = 75,
UP = 72,
RIGHT = 77,
DOWN = 80,
SELECT = 0,
PRINT = 0,
EXECUTE = 0,
SNAPSHOT = 84,
INSERT = 82,
DELETE = 83,
HELP = 99,
KEY_0 = 11,
KEY_1 = 2,
KEY_2 = 3,
KEY_3 = 4,
KEY_4 = 5,
KEY_5 = 6,
KEY_6 = 7,
KEY_7 = 8,
KEY_8 = 9,
KEY_9 = 10,
KEY_A = 30,
KEY_B = 48,
KEY_C = 46,
KEY_D = 32,
KEY_E = 18,
KEY_F = 33,
KEY_G = 34,
KEY_H = 35,
KEY_I = 23,
KEY_J = 36,
KEY_K = 37,
KEY_L = 38,
KEY_M = 50,
KEY_N = 49,
KEY_O = 24,
KEY_P = 25,
KEY_Q = 16,
KEY_R = 19,
KEY_S = 31,
KEY_T = 20,
KEY_U = 22,
KEY_V = 47,
KEY_W = 17,
KEY_X = 45,
KEY_Y = 21,
KEY_Z = 44,
LWIN = 91,
RWIN = 92,
APPS = 93,
SLEEP = 95,
NUMPAD0 = 82,
NUMPAD1 = 79,
NUMPAD2 = 80,
NUMPAD3 = 81,
NUMPAD4 = 75,
NUMPAD5 = 76,
NUMPAD6 = 77,
NUMPAD7 = 71,
NUMPAD8 = 72,
NUMPAD9 = 73,
MULTIPLY = 55,
ADD = 78,
SEPARATOR = 0,
SUBTRACT = 74,
DECIMAL = 83,
DIVIDE = 53,
F1 = 59,
F2 = 60,
F3 = 61,
F4 = 62,
F5 = 63,
F6 = 64,
F7 = 65,
F8 = 66,
F9 = 67,
F10 = 68,
F11 = 87,
F12 = 88,
F13 = 100,
F14 = 101,
F15 = 102,
F16 = 103,
F17 = 104,
F18 = 105,
F19 = 106,
F20 = 107,
F21 = 108,
F22 = 109,
F23 = 110,
F24 = 118,
NUMLOCK = 69,
SCROLL = 70,
LSHIFT = 42,
RSHIFT = 54,
LCONTROL = 29,
RCONTROL = 29,
LMENU = 56,
RMENU = 56,
BROWSER_BACK = 106,
BROWSER_FORWARD = 105,
BROWSER_REFRESH = 103,
BROWSER_STOP = 104,
BROWSER_SEARCH = 101,
BROWSER_FAVORITES = 102,
BROWSER_HOME = 50,
VOLUME_MUTE = 32,
VOLUME_DOWN = 46,
VOLUME_UP = 48,
MEDIA_NEXT_TRACK = 25,
MEDIA_PREV_TRACK = 16,
MEDIA_STOP = 36,
MEDIA_PLAY_PAUSE = 34,
LAUNCH_MAIL = 108,
LAUNCH_MEDIA_SELECT = 109,
LAUNCH_APP1 = 107,
LAUNCH_APP2 = 33,
OEM_1 = 39,
OEM_PLUS = 13,
OEM_COMMA = 51,
OEM_MINUS = 12,
OEM_PERIOD = 52,
OEM_2 = 53,
OEM_3 = 41,
OEM_4 = 26,
OEM_5 = 43,
OEM_6 = 27,
OEM_7 = 40,
OEM_8 = 0,
OEM_102 = 86,
PROCESSKEY = 0,
PACKET = 0,
ATTN = 0,
CRSEL = 0,
EXSEL = 0,
EREOF = 93,
PLAY = 0,
ZOOM = 98,
NONAME = 0,
PA1 = 0,
OEM_CLEAR = 0,
}
}
}
As you can see, the Strum method contains 2 instances of the Task.Delay method. The code above will NOT work if I remove the 2 instances of the Task.Delay method.
Why does the keyboard input not send if I remove the delays?
How can I send the keyboard input without having to use the delays?
Any help is appreciated!
回答1:
Does this change the result? (note, deliberately removed the async return type)
private static void Strum()
{
var inputs = new[]
{
new INPUT
{
type = InputType.KEYBOARD,
U =
{
ki =
{
wScan = ScanCodeShort.RSHIFT
}
}
},
new INPUT
{
type = InputType.KEYBOARD,
U =
{
ki =
{
wScan = ScanCodeShort.RSHIFT,
dwFlags = KEYEVENTF.KEYUP
}
}
}
};
for (var i = 0; i < 18; i++)
{
SendInput((uint)inputs.Length, inputs, INPUT.Size);
}
}
来源：https://stackoverflow.com/questions/38192840/sendinput-doesnt-work-in-a-game-unless-i-add-delays-why