WinForm implement a screenshot of the rectangle box

Here's how to use it:

private void Button1_Click (object sender, EventArgs e)        {          s.gerscreenformrectangle ();                   }        Private Zgke.copyscreen S;        private void Form1_Load (object sender, EventArgs e)        {            s = new Zgke.copyscreen ();            S.getscreenimage+=new Zgke.CopyScreen.GetImage (s_getscreenimage);        }              void S_getscreenimage (Image p_image)        {            picturebox1.image = p_image;        }

When you press BUTTON1, you can select a rectangle on the screen to

All of the classes

Start by building a new project for the Windows Library class. Here because of the need for global hooks. I don't know why I can't set the global hooks in the WinForm. But in the DLL you can ... Hateful C # .....

Copy the following code into CLASS1.CS.

Using system;using system.collections.generic;using system.text;using system.runtime.interopservices;using  System.drawing;using system.windows.forms;namespace zgke{public class API {[DllImport ("User32.dll", CharSet        = CharSet.Auto)] public static extern IntPtr GetDesktopWindow ();  [DllImport ("user32.dll", CharSet = CharSet.Auto)] public static extern IntPtr SetWindowsHookEx (int hookid, HookProc        Pfnhook, IntPtr hinst, int threadid);        Public delegate IntPtr HookProc (int nCode, IntPtr wParam, IntPtr lParam); [DllImport ("kernel32.dll", ExactSpelling = true, CharSet = CharSet.Auto)] public static extern int GetCurrentThread        Id (); [DllImport ("user32.dll", CharSet = CharSet.Auto, ExactSpelling = true)] public static extern bool Unhookwindowshook        Ex (IntPtr hhook); public enum Windowshookcodes {wh_msgfilter = ( -1), Wh_journalrecord = 0, Wh_journ Alplayback = 1, Wh_keyboard = 2, Wh_getmessage = 3, Wh_callwndproc = 4, WH_CBT = 5, Wh_sysmsgfilter = 6, Wh_mouse = 7, Wh_hardware = 8, Wh_debug = 9, Wh_shell = ten, Wh_fore    Groundidle = one, Wh_callwndprocret = 14, Wh_keyboard_ll = Wh_mouse_ll }///<summary>///A according to the rectangular class//[email protected]///qq:116149//</summary> PU Blic class Copyscreen {//<summary>///Screen size//</summary> private size Scre        Ensize {get {return Screen.PrimaryScreen.Bounds.Size;}} <summary>///mouse position///</summary> private point Mousepoint {get {return Cursor.posi tion;        }}///<summary>///Private method Get screen graphics (all graphics)///</summary> public Bitmap Screenimage {get {BitmapM_backbitmap = new Bitmap (screensize.width, screensize.height);                Graphics _graphics = Graphics.fromimage (M_backbitmap);                _graphics.copyfromscreen (new point (0, 0), new Point (0, 0), screensize);                _graphics.dispose ();            return m_backbitmap;        }}///<summary>//hooks//</summary> private hookmessage m_hookmessage;        <summary>////Screen handle///</summary> private IntPtr m_screenform;        <summary>//graphics///</summary> private Bitmap m_image;        public delegate void GetImage (Image p_image);        <summary>///Get screen///</summary> public event GetImage Getscreenimage; <summary>//construction///</summary> public Copyscreen () {M_screenform = API.            GetDesktopWindow (); M_hookmessage = new Hookmessage (Api.            Windowshookcodes.wh_mouse_ll, True);        M_hookmessage.gethook + = new Hookmessage.gethookmessage (M_hookmessage_gethook); }///<summary>//Hook events///</summary>//<param name= "P_code" ></param&        Gt <param name= "P_wparam" ></param>//<param name= "P_lparam" ></param>//<para  M name= "P_send" ></param> void M_hookmessage_gethook (int p_code, IntPtr p_wparam, IntPtr P_lparam, ref bool                    P_send) {if (m_starmouse) {switch (P_wparam.toint32 ()) {                        Case://move MouseMove ();                    Break                        Case 513://down MouseDown ();                        P_send = false;                    Break                        Case 514://up MouseUp ();              P_send = false;          Break                        Default:m_starmouse = false;                Break }}}////<summary>//depending on the rectangle if width is being directly returned if the-will convert to a positive rectangle to ensure that the size position remains the same//</sum        mary>//<param name= "P_rectangle" > Rectangle </param>//<returns> Positive Rectangle </returns>            public static Rectangle Getuprightrectangle (Rectangle p_rectangle) {Rectangle _rect = P_rectangle;                if (_rect.width < 0) {int _x = _rect.x;                _rect.x = _rect.width + _rect.x;            _rect.width = _x-_rect.x;                } if (_rect.height < 0) {int _y = _RECT.Y;                _rect.y = _rect.height + _rect.y;            _rect.height = _y-_rect.y;        } return _rect;        } private Rectangle M_mouserectangle = new Rectangle (0, 0, 0, 0); private bool M_drawStar = false;            private void MouseDown () {m_mouserectangle.x = Mousepoint.x;            M_mouserectangle.y = Mousepoint.y;        M_drawstar = true; } private void MouseMove () {if (M_drawstar) {Controlpaint.drawreversi                Bleframe (M_mouserectangle, color.transparent, framestyle.dashed);                M_mouserectangle.width = mousepoint.x-m_mouserectangle.x;                M_mouserectangle.height = Mousepoint.y-m_mouserectangle.y;            Controlpaint.drawreversibleframe (M_mouserectangle, Color.White, framestyle.dashed); }} private void MouseUp () {controlpaint.drawreversibleframe (M_mouserectangle, Color.tran            Sparent, framestyle.dashed);            M_drawstar = false;            M_starmouse = false;            Rectangle _screenrectangle = Getuprightrectangle (M_mouserectangle);            m_mouserectangle.x = 0;     m_mouserectangle.y = 0;       m_mouserectangle.width = 0;            m_mouserectangle.height = 0;  if (getscreenimage! = null) {if (_screenrectangle.width! = 0 && _screenrectangle.height            ! = 0) getscreenimage (M_image.clone (_screenrectangle, M_image.pixelformat));        }} private bool M_starmouse = false;            <summary>///Get graphics///</summary> public void Gerscreenformrectangle () {            M_image = Screenimage;        M_starmouse = true;            }///<summary>//Get graphics///</summary> public void Getscreen () {        if (getscreenimage! = null) getscreenimage (screenimage); }}///<summary>/////[email protected]///</summary> public class Hookmes        Sage {private INTPTR M_hookex; <summary>///Set your own process hooks///</summary>//<param name= "p_hookcodes "> Hook type </param> public hookmessage (API. Windowshookcodes p_hookcodes) {M_hookex = API. SetWindowsHookEx (int) p_hookcodes, new API. HookProc (Sethookproc), IntPtr.Zero, API.        GetCurrentThreadID ()); }///<summary>///Set process hooks///</summary>//<param name= "P_hookcodes" > Hook class Type </param>//<param name= "P_threadid" > Global hooks </param> public hookmessage (API. Windowshookcodes P_hookcodes, bool P_zero) {IntPtr _value = System.Runtime.InteropServices.Marshal.GetH INSTANCE (System.Reflection.Assembly.GetExecutingAssembly ().            GetModules () [0]); M_hookex = API. SetWindowsHookEx (int) p_hookcodes, new API.        HookProc (Sethookproc), _value, 0);            }//<summary>///close hook///</summary> public void Unhookmessage () { if (API. UnhookWindowsHookEx (M_hookex)) {M_hookex = IntPtr.Zero;           }} public delegate void Gethookmessage (int p_code, IntPtr p_wparam, IntPtr p_lparam, ref bool P_        Send);        public event Gethookmessage Gethook; Private INTPTR sethookproc (int p_code, IntPtr p_wparam, IntPtr p_lparam) {GC.            Collect (); Gc.            WaitForPendingFinalizers (); Gc.            Collect ();            bool _sendmessage = true;            if (Gethook! = null) Gethook (P_code, P_wparam, P_lparam, ref _sendmessage);            if (!_sendmessage) return new INTPTR (1);        return IntPtr.Zero; }    }}

It would be nice to cite the project in other projects.

WinForm Implementing a rectangular box