using System;
using System.Net;
using System.Runtime.InteropServices;
using System.Text;
using System.Windows.Forms;
namespace RemoteView.PageHandlers
{
class ClickPageHandler : PageHandler
{
private Screen[] screens = Screen.AllScreens;
///
/// Act upon clicks received from application.
/// Input parsing is robust, trying to work even if problems are present in requesting string.
///
/// server response
/// tokenized URI
///
public override byte[] handleRequest(HttpListenerResponse response, string[] uri)
{
// must have 5 tokens
if (uri.Length != 6)
{
response.Redirect("/");
return Encoding.UTF8.GetBytes("Error...");
}
int x, y;
try
{
y = Convert.ToInt16(uri[4]);
x = Convert.ToInt16(uri[5]);
}
catch
{
// parameter error, redirect to home
response.Redirect("/");
return Encoding.UTF8.GetBytes("Error...");
}
int screen = getRequestedScreenDevice(uri, screens);
// check bounds
Screen device = screens[screen];
if (x < 0 || x >= device.Bounds.Width || y < 0 || y >= device.Bounds.Height)
{
response.Redirect("/");
return Encoding.UTF8.GetBytes("Error...");
}
// grab the first character
switch (uri[3][0])
{
case 'l':
// left click
ClickLeftMouseButton(x, y);
break;
case 'd':
break;
case 'r':
ClickRightMouseButton(x, y);
break;
default:
// error, redirect to home
response.Redirect("/");
return Encoding.UTF8.GetBytes("Error...");
}
// request a refresh by redirecting to the homepage
response.Redirect("/home/" + screen);
return Encoding.UTF8.GetBytes("Redirecting...");
}
enum SystemMetric
{
SM_CXSCREEN = 0,
SM_CYSCREEN = 1,
}
#region http://stackoverflow.com/questions/8021954/sendinput-doesnt-perform-click-mouse-button-unless-i-move-cursor
[DllImport("user32.dll")]
static extern int GetSystemMetrics(SystemMetric smIndex);
[DllImport("user32.dll", SetLastError = true)]
static extern uint SendInput(uint nInputs, ref INPUT pInputs, int cbSize);
[StructLayout(LayoutKind.Sequential)]
struct HARDWAREINPUT
{
public int uMsg;
public short wParamL;
public short wParamH;
}
[StructLayout(LayoutKind.Sequential)]
struct KEYBDINPUT
{
public ushort wVk;
public ushort wScan;
public uint dwFlags;
public uint time;
public IntPtr dwExtraInfo;
}
[StructLayout(LayoutKind.Explicit)]
struct MouseKeybdhardwareInputUnion
{
[FieldOffset(0)]
public MouseInputData mi;
[FieldOffset(0)]
public KEYBDINPUT ki;
[FieldOffset(0)]
public HARDWAREINPUT hi;
}
[StructLayout(LayoutKind.Sequential)]
struct INPUT
{
public SendInputEventType type;
public MouseKeybdhardwareInputUnion mkhi;
}
[Flags]
enum MouseEventFlags : uint
{
MOUSEEVENTF_MOVE = 0x0001,
MOUSEEVENTF_LEFTDOWN = 0x0002,
MOUSEEVENTF_LEFTUP = 0x0004,
MOUSEEVENTF_RIGHTDOWN = 0x0008,
MOUSEEVENTF_RIGHTUP = 0x0010,
MOUSEEVENTF_MIDDLEDOWN = 0x0020,
MOUSEEVENTF_MIDDLEUP = 0x0040,
MOUSEEVENTF_XDOWN = 0x0080,
MOUSEEVENTF_XUP = 0x0100,
MOUSEEVENTF_WHEEL = 0x0800,
MOUSEEVENTF_VIRTUALDESK = 0x4000,
MOUSEEVENTF_ABSOLUTE = 0x8000
}
enum SendInputEventType : int
{
InputMouse,
InputKeyboard,
InputHardware
}
struct MouseInputData
{
public int dx;
public int dy;
public uint mouseData;
public MouseEventFlags dwFlags;
public uint time;
public IntPtr dwExtraInfo;
}
int CalculateAbsoluteCoordinateX(int x)
{
return (x * 65536) / GetSystemMetrics(SystemMetric.SM_CXSCREEN);
}
int CalculateAbsoluteCoordinateY(int y)
{
return (y * 65536) / GetSystemMetrics(SystemMetric.SM_CYSCREEN);
}
public void ClickLeftMouseButton(int x, int y)
{
INPUT mouseInput = new INPUT();
mouseInput.type = SendInputEventType.InputMouse;
mouseInput.mkhi.mi.dx = CalculateAbsoluteCoordinateX(x);
mouseInput.mkhi.mi.dy = CalculateAbsoluteCoordinateY(y);
mouseInput.mkhi.mi.mouseData = 0;
mouseInput.mkhi.mi.dwFlags = MouseEventFlags.MOUSEEVENTF_MOVE | MouseEventFlags.MOUSEEVENTF_ABSOLUTE;
SendInput(1, ref mouseInput, Marshal.SizeOf(new INPUT()));
mouseInput.mkhi.mi.dwFlags = MouseEventFlags.MOUSEEVENTF_LEFTDOWN;
SendInput(1, ref mouseInput, Marshal.SizeOf(new INPUT()));
mouseInput.mkhi.mi.dwFlags = MouseEventFlags.MOUSEEVENTF_LEFTUP;
SendInput(1, ref mouseInput, Marshal.SizeOf(new INPUT()));
}
public void ClickRightMouseButton(int x, int y)
{
INPUT mouseInput = new INPUT();
mouseInput.type = SendInputEventType.InputMouse;
mouseInput.mkhi.mi.dx = CalculateAbsoluteCoordinateX(x);
mouseInput.mkhi.mi.dy = CalculateAbsoluteCoordinateY(y);
mouseInput.mkhi.mi.mouseData = 0;
mouseInput.mkhi.mi.dwFlags = MouseEventFlags.MOUSEEVENTF_MOVE | MouseEventFlags.MOUSEEVENTF_ABSOLUTE;
SendInput(1, ref mouseInput, Marshal.SizeOf(new INPUT()));
mouseInput.mkhi.mi.dwFlags = MouseEventFlags.MOUSEEVENTF_RIGHTDOWN;
SendInput(1, ref mouseInput, Marshal.SizeOf(new INPUT()));
mouseInput.mkhi.mi.dwFlags = MouseEventFlags.MOUSEEVENTF_RIGHTUP;
SendInput(1, ref mouseInput, Marshal.SizeOf(new INPUT()));
}
#endregion
}
}