Using the Win32 API for process communication---through the clipboard

The principle of invoking the//windows message mechanism in C # Win32 API//clipboard viewer chain. using system;using system.collections.generic;using System.componentmodel;using system.data;using system.drawing;using system.text;using System.Windows.Forms;using System.runtime.interopservices; namespace useclipboard{     Public partial class Frmmain:form     {        private int nextwindow;        [DllImport ("User32.dll")]&nb Sp       public static extern int setclipboardviewer (int h);        [DllImport ("User32.dll ")]        public static extern int SendMessage (int hwnd, int wmsg, int wParam, int lParam);  &NB Sp     protected override void WndProc (ref Message m)         {        &NBSP ;   Switch (m.msg)             {                CA Se 0x308://wm_drawclipboard                     //string message = string. Format ("Message received!" parameter: {0},{1} ", M.wparam, m.LParam);                   //mes Sagebox.show (message);                    if (Nextwindow! = 0)   &NB Sp                 {                  &N Bsp     SendMessage (Nextwindow, Int32.Parse (m.msg.tostring ()), M.wparam.toint32 (), M.lparam.toint32 ());                   }                &N Bsp   Pastefromclipboard ();                    break;    &NBS P           case 0x30d://wm_changecbchain                &N Bsp   String message2 = StrinG.format ("Message received!" parameter: {0},{1} ", M.wparam, m.LParam);                    Mes Sagebox.show (message2);                    if (Nextwindow = = M.wparam.to Int32 ())                         Nextwindow = M.lparam.toint32 ( );                    ELSE if (Nextwindow! = 0)       &NBS P             {                      &N Bsp SendMessage (Nextwindow, Int32.Parse (m.msg.tostring ()), M.wparam.toint32 (), M.lparam.toint32 ());                   }                    BR eak;                default:              &NBSP ;     base. DEfwndproc (ref m);                    break;        & nbsp  }       }        public frmmain ()         {  &nbsp ;         InitializeComponent ();            Nextwindow = Setclipboardviewe R (Handle.toint32 ());       }       //image         private image bmp        {            get            {& nbsp               return picturebox1.image;           }&NBSP ;           set            {                pictureBox1.Image = value;           }       }  &N Bsp &nbSp  //Picture description         private string info        {        &NBSP ;   get            {                return Txtima geinfo.text;           }            set      & nbsp     {                Txtimageinfo.text = value;      &NBS P    }       }                 Private Voi d Btnloadpic_click (object sender, EventArgs e)         {            Choos Eimagefile ();       }        //Select image         private void Chooseimagefile ()         {            if (Openfiledialog1.showdialog () = = DialogResult.ok)             {                BMP = new Bit Map (openfiledialog1.filename);           }       }       //Create objects based on user-defined information         private mypic createmypicobj ()         {  &nbsp ;         Mypic obj = new Mypic ();            Obj.pic = bmp;            Obj.picinfo = info;            return obj;      & nbsp }        //Copy objects to clipboard         private void CopyToClipboard ()     &NB Sp   {           //Create Mypic object             Mypic obj = Createm Ypicobj ();           //register type to Clipboard in the format "project name. Data format name"             Da Taformats.foRmat  userdefformat = Dataformats.getformat ("Useclipboard.mypic");           // Creating a data object, loading objects of type Mypic             IDataObject dataobj = new DataObject (obj);    &N Bsp      //other types of data can also be loaded into data Objects             Dataobj. SetData (Dataformats.unicodetext, info);            Dataobj. SetData (Dataformats.bitmap, BMP);           //Copy to Clipboard, the second parameter indicates that the program exits without emptying the Clipboard     & nbsp       Clipboard.setdataobject (dataobj,true);       }       &NBSP ; private void Btnexit_click (object sender, EventArgs e)         {          &NBS P Close ();                  }         Private VO ID Btncopytoclipboard_click (object sender, EventArgs e)         {            CopyToClipboard ();       }         Get data from clipboard         private void Pastefromclipboard ()         {           //clipboard have the data I need?             if (Clipboard.containsdata ("useclipboard.mypic") = = False)       & nbsp         return;           //Read data           &NBS P IDataObject clipobj = Clipboard.getdataobject ();           //Convert data to required type     &NBS P       Mypic mypicobj = clipobj. GetData ("Useclipboard.mypic") as mypic;           //Break down data from data Objects       &NB Sp     info = mypicobj.picinfo;            pictureBox1.Image = mypicobj.pic;  &N Bsp    }       &NBSp private void Btnpastefromclipboard_click (object sender, EventArgs e)         {      &NBS P     Pastefromclipboard ();       }        }}

Using the Win32 API for process communication---through the clipboard