GdViewer integration in Visual C++ with MFC

Overview

This tutorial is aiming at creating simple MFC application using GdPicture.NET with Visual C++ (up to VS 2017), which will contain GdViewer ActiveX component. GdViewer will create dynamically, and a click on "button" triggers all functionality. For better understanding, we demonstrate the steps on the attached snapshots below.

You can find the simple example of usage in the folder [INSTALLATION FOLDER]\Samples\WinForm\c++ mfc using com interop .

Integration

1. Start a new project in Visual Studio ---> File -> New -> Project ---> and select Visual C++ -> MFC/ATL -> MFC application. Write the project name and confirm. As an application type select "Dialog based application" and finish creating the project. Copy (not required) GdPicture.NET.14.(64).dll and GdPicture.NET.14.tlb into your application folder.
2. To import the installed GdPicture.NET toolkit (dll) and to integrate the GdViewer control you need to follow both these steps:
   1. Importing as ActiveX control:
      1. Use Project/Class Wizard (available until VS 2017) and select the "Add Class" dropdown and then "MFC Class from ActiveX control" item. This is neccessary for controls like GdViewer.
      2. The window with the wizard appears. From the "Available ActiveX controls" list choose "GdPicture14.GdViewer".
      3. From the Interfaces list choose "IGdViewer" and add it on the "Generated classes" list.
      4. Click Finish button, then press OK to finish class wizard.
   2. Importing from TypeLib:
      1. Use Project/Class Wizard (available until VS 2017) and select the "Add Class" dropdown and then "MFC Class From TypeLib" item.
      2. The window with the wizard appears. From the "Available type libraries" list choose "GdPicture14 - Document Imaging".
      3. From the Interfaces list choose "ILicenseManager" and "__GdViewer". Add them on the "Generated classes" list.
      4. Click Finish button, then press OK to finish class wizard.
3. Initialize COM objects in your application by adding this code line:
   • HRESULT hr = CoInitialize(NULL);
4. Include generated headers into your files and build the application.

BOOL CdemoApp::InitInstance()

 {

   ...

   InitCtrls.dwICC = ICC_WIN95_CLASSES;

   InitCommonControlsEx(&InitCtrls);



   CWinApp::InitInstance();

   HRESULT hr = CoInitialize(NULL);

   ...

 }

// Add GdViewer control to the demoDlg.h file:

class CdemoDlg : public CDialogEx

{

 // Construction

 public:

    CGdViewer sampleView;

    ...

}



// Include headers in the demoDlg.cpp file:

#include "C_GdViewer.h"

#include "CLicenseManager.h"

GdViewer functionality

Add code to initialize the GdViewer component

    1. Your default solution will look like this (see the first screenshot). In resource view (right-top panel) click on Dialog/IDD_DEMO_DIALOG (see the second screenshot).

    2. When formular appears, from the toolbox on the left side choose "Button" and place it on the formular.
    4. Double click on the formular -> the method for the button click appears.
    5. Update it with this code:

const int CTRL_ID = 280;

void CdemoDlg::OnBnClickedButton1()

{

    // TODO: Add your control notification handler code here

    CLicenseManager oLicenseManager;

    oLicenseManager.CreateDispatch(L"GdPicture14.LicenseManager");

    oLicenseManager.RegisterKEY(L" XXX ");

    // Create the control, just make sure to use WS_CHILD and WS_VISIBLE.

    if (!sampleView.Create(L"PdfWnd", WS_CHILD | WS_VISIBLE, CRect(0, 0, 200, 200), this, CTRL_ID))

    {

        AfxMessageBox(L"Failed to create GdViewer control");

        return;

    }

    // Sample init settings, not neccessary

    sampleView.put_EnableMenu(false);

    sampleView.put_ContinuousViewMode(TRUE);

    sampleView.put_MouseWheelMode(2);

    sampleView.put_ScrollBars(TRUE);

    sampleView.DisplayFromFile(L"image.jpg");

    sampleView.Redraw();

}

Add code to dispose of the GdViewer component

This is only an example of how you can release the GdViewer component. The important point here is that you need to dispose of the objects properly one way or another.     1. Add a new method for handling Close() message like this: click to resource view-> demo -> dialog -> IDD_DEMO_DIALOG
    2. Formular with our dialog appears, click into formular (to select it).
    4. Click on messages icon in properties bar.
    5. Double click on field next to "WM_CLOSE" message. This will offer you option to create method for handling Close() message.
    6. Add this code to method we just created:

// The result will look like this:

void CdemoDlg::OnClose()

{

    // TODO: Add your message handler code here and/or call default

    CDialogEx::OnClose();

    sampleView.CloseDocument();

    sampleView.Dispose();

}