C#

WndProc()

protected override void WndProc(ref Message m)
{
    Boolean handled = false;
    if (m.Msg == NativeCalls.APIAttach && (uint) m.LParam == NativeCalls.SKYPECONTROLAPI_ATTACH_SUCCESS)
    {
        // Get the current handle to the Skype window
        NativeCalls.HWND_BROADCAST = m.WParam;
        handled = true;
        m.Result = new IntPtr(1);
    }

    // Skype sends our program messages using WM_COPYDATA. the data is in lParam
    if (m.Msg == NativeCalls.WM_COPYDATA && m.WParam == NativeCalls.HWND_BROADCAST)
    {
        COPYDATASTRUCT data = (COPYDATASTRUCT)Marshal.PtrToStructure(m.LParam, typeof(COPYDATASTRUCT));
        StatusTextBox.Items.Add(data.lpData + Environment.NewLine);

        // Check for connection
        //if (data.lpData.IndexOf("CONNSTATUS ONLINE") > -1)
        // ConnectButton.IsEnabled = false;

        // Check for calls
        IsCallInProgress(data.lpData);
        handled = true;
        m.Result = new IntPtr(1);
    }

    m.Result = IntPtr.Zero;
    if (handled) DefWndProc(ref m); else base.WndProc(ref m);
    //base.WndProc(ref m);
}

if (m.Msg == NativeCalls.WM_COPYDATA && m.WParam == NativeCalls.HWND_BROADCAST)

here i attach the link of my win application and that is https://onedrive.live.com/#cid=C4A6F16F34D7540A&id=C4A6F16F34D7540A!126 just download the skypecalltest and run it.

before run my apps just login to skype and then run my apps where you put a phone no and click on call button then you can see the controls is not coming repeatedly to the second if block.

so what i need to change in my code as a result control will come to second if block repeatedly .

in the same link there is another same kind of apps which is based on wpf and that is working where wndproc is calling repeatedly. if possible check that code too and guide me what i am missing or making mistake. thanks

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml.Linq;
using Outlook = Microsoft.Office.Interop.Outlook;
using Office = Microsoft.Office.Core;
using System.Windows.Forms;

namespace SendLaterToolbar
{
    public partial class ThisAddIn
    {
        Office.CommandBar newToolBar;
        Office.CommandBarButton firstButton;
        Office.CommandBarButton secondButton;
        Outlook.Explorers selectExplorers;
        Outlook.Inspectors inspectors;
        Office.CommandBarButton _objEmailToolBarButton;

        private void ThisAddIn_Startup(object sender, System.EventArgs e)
        {
            selectExplorers = this.Application.Explorers;
            inspectors = this.Application.Inspectors;
            selectExplorers.NewExplorer += new Outlook.ExplorersEvents_NewExplorerEventHandler(newExplorer_Event);
            inspectors.NewInspector += new Microsoft.Office.Interop.Outlook.InspectorsEvents_NewInspectorEventHandler(AddToEmail);
            AddToolbar();
        }

        private void newExplorer_Event(Outlook.Explorer new_Explorer)
        {
            ((Outlook._Explorer)new_Explorer).Activate();
            newToolBar = null;
            AddToolbar();
        }

        private void ThisAddIn_Shutdown(object sender, System.EventArgs e)
        {

        }

        private void AddToolbar()
        {

            if (newToolBar == null)
            {
                Office.CommandBars cmdBars =
                    this.Application.ActiveExplorer().CommandBars;
                newToolBar = cmdBars.Add("NewToolBar",
                    Office.MsoBarPosition.msoBarTop, false, true);
            }
            try
            {
                Office.CommandBarButton button_1 =
                    (Office.CommandBarButton)newToolBar.Controls
                    .Add(1, missing, missing, missing, missing);
                button_1.Style = Office
                    .MsoButtonStyle.msoButtonCaption;
                button_1.Caption = "Button 1";
                button_1.Tag = "Button1";
                if (this.firstButton == null)
                {
                    this.firstButton = button_1;
                    firstButton.Click += new Office.
                        _CommandBarButtonEvents_ClickEventHandler
                        (ButtonClick);
                }

                Office.CommandBarButton button_2 = (Office
                    .CommandBarButton)newToolBar.Controls.Add
                    (1, missing, missing, missing, missing);
                button_2.Style = Office
                    .MsoButtonStyle.msoButtonCaption;
                button_2.Caption = "Button 2";
                button_2.Tag = "Button2";
                newToolBar.Visible = true;
                if (this.secondButton == null)
                {
                    this.secondButton = button_2;
                    secondButton.Click += new Office.
                        _CommandBarButtonEvents_ClickEventHandler
                        (ButtonClick);
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

        private void AddToEmail(Microsoft.Office.Interop.Outlook.Inspector Inspector)
        {
            Outlook.MailItem _ObjMailItem = (Outlook.MailItem)Inspector.CurrentItem;

            if (Inspector.CurrentItem is Outlook.MailItem)
            {
                _ObjMailItem = (Outlook.MailItem)Inspector.CurrentItem;
                bool IsExists = false;

                foreach (Office.CommandBar _ObjCmd in Inspector.CommandBars)
                {
                    if (_ObjCmd.Name == "MyEmailToolBar")
                    {
                        IsExists = true;
                        _ObjCmd.Delete();
                    }
                }

                Office.CommandBar _ObjCommandBar = Inspector.CommandBars.Add("MyEmailToolBar", Office.MsoBarPosition.msoBarBottom, false, true);
                _objEmailToolBarButton = (Office.CommandBarButton)_ObjCommandBar.Controls.Add(Office.MsoControlType.msoControlButton, 1, missing, missing, true);

                if (!IsExists)
                {
                    _objEmailToolBarButton.Caption = "My Email ToolBar Button";
                    _objEmailToolBarButton.Style = Office.MsoButtonStyle.msoButtonIconAndCaptionBelow;
                    _objEmailToolBarButton.FaceId = 500;
                    _objEmailToolBarButton.Click += new Office._CommandBarButtonEvents_ClickEventHandler(_objEmailToolBarButton_Click);
                    _ObjCommandBar.Visible = true;
                }
            }
        }


        private void ButtonClick(Office.CommandBarButton ctrl, ref bool cancel)
        {
            MessageBox.Show("You clicked: " + ctrl.Caption);
        }

        private void _objEmailToolBarButton_Click(Office.CommandBarButton ctrl, ref bool cancel)
        {
            MessageBox.Show("My Email ToolBar ...");
        }

        #region VSTO generated code

        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InternalStartup()
        {
            this.Startup += new System.EventHandler(ThisAddIn_Startup);
            this.Shutdown += new System.EventHandler(ThisAddIn_Shutdown);
        }

        #endregion
    }
}