1. As described above, we have found that the wizard-generated wrapper classes are not the best way to use ActiveX controls in an MFC application. However, because the wizard forces you to generate at least 5 such wrapper classes, you'll first need to remove those files from your project. If you select "File View" mode in Visual Studio, you'll see the various files created by the wizards. Remove the following files from the project:
   • igcorectl.cpp
   • igcorectl.h
   • igdisplayctl.cpp
   • igdisplayctl.h
   • igdlgsctl.cpp
   • igdlgsctl.h
   • igformatsctl.cpp
   • igformatsctl.h
   • igpageviewctl.cpp
   • igpageviewctl.h

   Then open the header file created for your application's dialog (if you named your project IG_MFC, then the dialog header file will be IG_MFCDlg.h), and add five import statements near the top, as follows:

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   #if _MSC_VER > 1000 #pragma once #endif // _MSC_VER > 1000 #import "C:\Program Files\Accusoft\ImageGear v18\...\Shared\Bin\igcore18a.ocx" #import "C:\Program Files\Accusoft\ImageGear 18\...\Shared\Bin\igformats18a.ocx" #import "C:\Program Files\Accusoft\ImageGear v18\...\Shared\Bin\igdisplay18a.ocx" #import "C:\Program Files\Accusoft\ImageGear v18\...\Shared\Bin\igdlgs18a.ocx" #import "C:\Program Files\Accusoft\ImageGear v18\...\Shared\Bin\igview18a.ocx"

   This will cause .tlh and .thi files to be generated when your application is compiled. We have found that the wrapper classes defined in .tlh files are easier to use.

2. Add private member variables for the various ImageGear ActiveX controls and COM objects to your dialog header file:

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   protected: HICON m_hIcon; GearCORELib::IIGPagePtr m_pPage; GearDISPLAYLib::IIGPageDisplayPtr m_pPageDisplay; GearDISPLAYLib::IIGDisplayCtlPtr m_pDisplayCtl; GearVIEWLib::IIGPageViewCtlPtr m_pPageViewCtl; GearFORMATSLib::IIGFormatsCtlPtr m_pFormatsCtl; GearCORELib::IIGCoreCtlPtr m_pCoreCtl; GearDIALOGSLib::IIGDlgsCtlPtr m_pDlgsCtl; GearDIALOGSLib::IIGFileDlgPtr m_pFileDialog; // Generated message map functions virtual BOOL OnInitDialog(); afx_msg void OnSysCommand(UINT nID, LPARAM lParam); afx_msg void OnPaint(); afx_msg HCURSOR OnQueryDragIcon(); DECLARE_MESSAGE_MAP()

3. Add initializers for these member variables to the constructor for your Dialog class:

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   CIG_MFCDlg::CIG_MFCDlg(CWnd* pParent /*=NULL*/) : CDialog(CIG_MFCDlg::IDD, pParent) , m_pPage(NULL) , m_pPageDisplay(NULL) , m_pDisplayCtl(NULL) , m_pPageViewCtl(NULL) , m_pFormatsCtl(NULL) , m_pCoreCtl(NULL) , m_pDlgsCtl(NULL) , m_pFileDialog(NULL) { //{{AFX_DATA_INIT(CIG_MFCDlg) // NOTE: the ClassWizard will add member initialization here //}}AFX_DATA_INIT // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); }

4. Add the following code to the Init_Dialog() method for your Dialog class:

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   BOOL CIG_MFCDlg::OnInitDialog() { CDialog::OnInitDialog(); // Set the icon for this dialog. The framework does this // when the application's main window is not a dialog SetIcon(m_hIcon, True); // Set big icon SetIcon(m_hIcon, False); // Set small icon CWnd *coreWnd, *formatsWnd, *displayWnd, *pageviewWnd, *dlgsWnd; coreWnd = GetDlgItem(IDC_IGCORECTL1); formatsWnd = GetDlgItem(IDC_IGFORMATSCTL1); dlgsWnd = GetDlgItem(IDC_IGDLGSCTL1); displayWnd = GetDlgItem(IDC_IGDISPLAYCTL1); pageviewWnd = GetDlgItem(IDC_IGPAGEVIEWCTL1); //Create the different controls m_pCoreCtl = (GearCORELib::IIGCoreCtlPtr) coreWnd->GetControlUnknown(); m_pFormatsCtl = (GearFORMATSLib::IIGFormatsCtlPtr) formatsWnd->GetControlUnknown(); m_pDlgsCtl = (GearDIALOGSLib::IIGDlgsCtlPtr) dlgsWnd->GetControlUnknown(); m_pDisplayCtl = (GearDISPLAYLib::IIGDisplayCtlPtr) displayWnd->GetControlUnknown(); m_pPageViewCtl = (GearVIEWLib::IIGPageViewCtlPtr) pageviewWnd->GetControlUnknown(); m_pCoreCtl->GetLicense()->SetSolutionName("Accusoft"); m_pCoreCtl->GetResult()->NotificationFlags = GearCORELib::IG_ERR_OLE_ERROR; try { m_pCoreCtl->AssociateComponent( m_pFormatsCtl->ComponentInterface ); m_pCoreCtl->AssociateComponent( m_pDisplayCtl->ComponentInterface ); m_pDlgsCtl->GearFormats = m_pFormatsCtl- >ComponentInterface; m_pDlgsCtl->GearCore = m_pCoreCtl- >ComponentInterface; m_pDlgsCtl->GearDisplay = m_pDisplayCtl- >ComponentInterface; m_pFileDialog = m_pDlgsCtl->CreateFileDlg(); m_pPage = m_pCoreCtl->CreatePage(); m_pPageDisplay = m_pDisplayCtl- >CreatePageDisplay(m_pPage); m_pPageViewCtl->PageDisplay = m_pPageDisplay; } catch( _com_error err ) { AfxMessageBox(err.Description()); } return True; // return True unless you set the focus to a control }

   The code above includes:

   IGCoreCtl Control	License.SetSolutionName	This method of the IGLicense Object sets the solution name for the ImageGear license.
   	Result.NotificationFlag	This method of the IGResult Object tells ImageGear to report errors using the VB On Error mechanism.
   	AssociateComponent	This method associates ImageGear components with the Core control.
   	CreatePage	This method creates and returns a new IGPage Object.
   	Result.isOk	This property of the IGResult Object tells if there are any errors on the error stack.
   IGDlgsCtl Control	GearFormats	This property sets the current Formats control used by the Dialog control.
   	GearCore	This property sets the current Core control used by the Dialog control.
   IGDisplayCtl Control	CreatePageDisplay	This method creates a new IGPageDisplay Object for the specified IGPage Object.
   IGPageViewCtl Control	PageDisplay	This property sets the current Page Display object displayed by the Page View control.
   	UpdateView	This method causes the Page View control to redraw itself.

5. In the Class View window, click to select the CIG_MFC node. Right click to display Properties dialog box, click the Messages icon button to show the Windows messages that this class can handle.

   In the Properties dialog box, click to select the WM_SIZE message, click the drop-down arrow, and then click the <ADD> OnSize option to create the WM_SIZE message handler method.

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   void CIG_MFCDlg::OnSize(UINT nType, int cx, int cy) { CDialog::OnSize(nType, cx, cy); // TODO: Add your message handler code here if (m_pPageViewCtl != NULL) { HWND hWnd = (HWND) m_pPageViewCtl->hWnd; ::SetWindowPos(hWnd, HWND_TOP, 0, 20, cx, cy-20, SWP_NOZORDER | SWP_NOACTIVATE); } }

6. Next, create a click procedure for the Open button by double-clicking it in the Dialog Editor. Then copy the following code into the OnBnClickedOpen() method:

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   void CIG_MFCDlg::OnBnClickedOpen() { try { GearDIALOGSLib::IIGFileDlgPageLoadOptionsPtr dlgLoadOptions; dlgLoadOptions = (GearDIALOGSLib::IIGFileDlgPageLoadOptionsPtr) m_pDlgsCtl->CreateFileDlgOptions( GearDIALOGSLib::IG_FILEDLGOPTIONS_PAGELOADOBJ ); if(m_pFileDialog->Show( (GearDIALOGSLib::IIGFileDlgOptionsPtr) dlgLoadOptions) ) { m_pFormatsCtl->LoadPageFromFile( m_pPage, dlgLoadOptions->FileName, dlgLoadOptions->PageNum); } m_pPageViewCtl->UpdateView(); } catch( _com_error err ) { AfxMessageBox(err.Description()); } }

   The code above includes:

   IGDlgsCtl Control	CreateFileDlgOptions	This method creates a file dialog options object that will contain for example the filename and page number
   IGFileDlg Object	Show	This method shows the file dialog and returns True if the user clicked OK.
   IGFormatsCtl Control	LoadPageFromFile	This method loads an image into the specified IGPage Object from the specified filename.

7. Finally, create click procedures for the Zoom In and Zoom Out buttons by double-clicking each of them in the Dialog Editor. Then copy the following code into the OnBnClickedZoomin() and OnBnClickedZoomout() methods:

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   void CIG_MFCDlg::OnBnClickedZoomin() { try { GearDISPLAYLib::IIGDisplayZoomInfoPtr zoominfo; zoominfo = (GearDISPLAYLib::IIGDisplayZoomInfoPtr) m_pPageDisplay->GetZoomInfo( m_pPageViewCtl->hWnd ); zoominfo->HZoom = zoominfo->HZoom * 1.25; zoominfo->VZoom = zoominfo->VZoom * 1.25; zoominfo->Mode = (GearDISPLAYLib::enumIGDsplZoomModes) (GearDISPLAYLib::IG_DSPL_ZOOM_H_FIXED | GearDISPLAYLib::IG_DSPL_ZOOM_V_FIXED); m_pPageDisplay->UpdateZoomFrom(zoominfo); m_pPageViewCtl->UpdateView(); } catch( _com_error err ) { AfxMessageBox(err.Description()); } }

   The above code zooms the image to 125 percent, or 5/4ths, of its size (zoom in by 25 percent).

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   void CIG_MFCDlg::OnBnClickedZoomout() { try { GearDISPLAYLib::IIGDisplayZoomInfoPtr zoominfo; zoominfo = (GearDISPLAYLib::IIGDisplayZoomInfoPtr) m_pPageDisplay->GetZoomInfo( m_pPageViewCtl->hWnd ); zoominfo->HZoom = zoominfo->HZoom * 0.80; zoominfo->VZoom = zoominfo->VZoom * 0.80; zoominfo->Mode = (GearDISPLAYLib::enumIGDsplZoomModes) (GearDISPLAYLib::IG_DSPL_ZOOM_H_FIXED | GearDISPLAYLib::IG_DSPL_ZOOM_V_FIXED); m_pPageDisplay->UpdateZoomFrom(zoominfo); m_pPageViewCtl->UpdateView(); } catch( _com_error err ) { AfxMessageBox(err.Description()); } }

   The above code zooms "out", decreasing the image to 4/5ths of its size, thereby canceling the effect of the zoom in above.

   The code above includes:

   IGPageDisplay Object	GetZoomInfo	This method creates and returns a new IGDisplayZoomInfo Object that contains zoom mode and values.
   	UpdateZoomFrom	This method sets zoom mode and values from the specified IGDisplayZoomInfo Object.

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