Visual C++ - COM Client Application for Internet Explorer - CoCreateInstance

---

I have come up a COM Client Application that can create an instance for Internet Explorer Control and Naviage to a URL which you type in. I have used CoCreateInstance and I have not used any ATL classes in this sample code.

 

Source Code

---

 

// IEClientDlg.cpp : implementation file

//

 

#include "stdafx.h"

#include "IEClient.h"

#include "IEClientDlg.h"

 

#ifdef _DEBUG

#define new DEBUG_NEW

#endif

 

 

// CAboutDlg dialog used for App About

 

class CAboutDlg : public CDialog

{

public:

        CAboutDlg();

 

// Dialog Data

        enum { IDD = IDD_ABOUTBOX };

 

        protected:

        virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support

 

// Implementation

protected:

        DECLARE_MESSAGE_MAP()

};

 

CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)

{

}

 

void CAboutDlg::DoDataExchange(CDataExchange* pDX)

{

        CDialog::DoDataExchange(pDX);

}

 

BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)

END_MESSAGE_MAP()

  

// CIEClientDlg dialog 

CIEClientDlg::CIEClientDlg(CWnd* pParent /*=NULL*/)

        : CDialog(CIEClientDlg::IDD, pParent)

    , m_url(_T("www.softwareandfinance.com"))

{

        m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);

}

 

void CIEClientDlg::DoDataExchange(CDataExchange* pDX)

{

    CDialog::DoDataExchange(pDX);

    DDX_Text(pDX, IDC_EDIT1, m_url);

}

 

BEGIN_MESSAGE_MAP(CIEClientDlg, CDialog)

        ON_WM_SYSCOMMAND()

        ON_WM_PAINT()

        ON_WM_QUERYDRAGICON()

        //}}AFX_MSG_MAP

    ON_BN_CLICKED(IDC_BUTTON1, &CIEClientDlg::OnBnClickedButton1)

END_MESSAGE_MAP()

 

 

// CIEClientDlg message handlers

 

BOOL CIEClientDlg::OnInitDialog()

{

        CDialog::OnInitDialog();

 

        // Add "About..." menu item to system menu.

 

        // IDM_ABOUTBOX must be in the system command range.

        ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);

        ASSERT(IDM_ABOUTBOX < 0xF000);

 

        CMenu* pSysMenu = GetSystemMenu(FALSE);

        if (pSysMenu != NULL)

        {

                CString strAboutMenu;

                strAboutMenu.LoadString(IDS_ABOUTBOX);

                if (!strAboutMenu.IsEmpty())

                {

                        pSysMenu->AppendMenu(MF_SEPARATOR);

                        pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);

                }

        }

 

        // Set the icon for this dialog.  The framework does this automatically

        //  when the application's main window is not a dialog

        SetIcon(m_hIcon, TRUE);                   // Set big icon

        SetIcon(m_hIcon, FALSE);                // Set small icon

 

        // TODO: Add extra initialization here

 

        return TRUE;  // return TRUE  unless you set the focus to a control

}

 

void CIEClientDlg::OnSysCommand(UINT nID, LPARAM lParam)

{

        if ((nID & 0xFFF0) == IDM_ABOUTBOX)

        {

                CAboutDlg dlgAbout;

                dlgAbout.DoModal();

        }

        else

        {

                CDialog::OnSysCommand(nID, lParam);

        }

}

 

// If you add a minimize button to your dialog, you will need the code below

//  to draw the icon.  For MFC applications using the document/view model,

//  this is automatically done for you by the framework.

 

void CIEClientDlg::OnPaint()

{

        if (IsIconic())

        {

                CPaintDC dc(this); // device context for painting

 

                SendMessage(WM_ICONERASEBKGND, reinterpret_cast<WPARAM>(dc.GetSafeHdc()), 0);

 

                // Center icon in client rectangle

                int cxIcon = GetSystemMetrics(SM_CXICON);

                int cyIcon = GetSystemMetrics(SM_CYICON);

                CRect rect;

                GetClientRect(&rect);

                int x = (rect.Width() - cxIcon + 1) / 2;

                int y = (rect.Height() - cyIcon + 1) / 2;

 

                // Draw the icon

                dc.DrawIcon(x, y, m_hIcon);

        }

        else

        {

                CDialog::OnPaint();

        }

}

 

// The system calls this function to obtain the cursor to display while the user drags

//  the minimized window.

HCURSOR CIEClientDlg::OnQueryDragIcon()

{

        return static_cast<HCURSOR>(m_hIcon);

}

 

 

void CIEClientDlg::OnBnClickedButton1()

{

    ::CoInitialize(NULL);

    IWebBrowser2 *browser = NULL;

 

    if( browser == NULL)

    {

        HRESULT hRes = CoCreateInstance(CLSID_InternetExplorer, NULL, CLSCTX_LOCAL_SERVER,

                           IID_IWebBrowser2, (void**)&browser);

        if(FAILED(hRes))

        {

            MessageBox("Failed to create Internet Explorer Control");

            return;

        }

    }

 

    {

       VARIANT vEmpty;

       VariantInit(&vEmpty);

 

       UpdateData(TRUE);

 

       USES_CONVERSION;

       BSTR bstrURL = SysAllocString(A2OLE((const char*) m_url));

 

       HRESULT hr = browser->Navigate(bstrURL, &vEmpty, &vEmpty, &vEmpty, &vEmpty);

       if (SUCCEEDED(hr))

       {

           browser->put_Visible(VARIANT_TRUE);

       }

       else

       {

           browser->Quit();

       }

 

       SysFreeString(bstrURL);

       browser->Release();

       browser = NULL;

   }

}

 
Click here to download the VS 2005 Project file and executable

Output

---

 

 

---

---