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Using Dynamic TWAIN in Visual C++ Dialog Based Applications

Topics included in this article that describe how to use Dynamic TWAIN in Visual C++ dialog based applications are:

  • 1. Adding Dynamic TWAIN to a Visual C++ Project
  • 2. Adding a Member Variable Associated with Dynamic TWAIN
  • 3. Adding an Event Handler
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    1. Adding Dynamic TWAIN to a Visual C++ Project

    1. Start Micorosoft Visual C++.
    2. On the File menu, click New to bring up the New dialog box.
    3. In the New dialog box, select MFC AppWizard (exe) project type and input DynamicTwainDlgApp in the Project Name edit box, as seen in the following figure.
    4. Click OK button.
    5. In the MFC AppWizard - Step 1 dialog box, select Dialog based application type and click Finish button.
    6. In the New Project Information dialog box, click OK button.
    7. On the Project menu, point to Add To Project, then click Components and Controls.
    8. In the Components and Controls Gallery dialog box , expand the Registered ActiveX Controls folder, select the DynamicTwain Class, click Insert.
    9. In the Microsoft Visual C++ dialog box, click OK.
    10. In the Confirm Classes dialog box, click OK.
    11. In the Components and Controls Gallery dialog box, click Close to close the dialog box.
    12. Dynamic TWAIN control will now appear in the Visual C++ dialog editor Toolbox, as seen in the following figure:
    13. From this point on, you can use Dynamic TWAIN in the same way as other controls.
    14. So far, Dynamic TWAIN ActiveX Control has been imported into DynamicTwainDlgApp project, and a wrapper class called CDynamicTwain has been generated by Visual C++ IDE, as seen in the following figure:

    2. Adding a Member Variable Associated with Dynamic TWAIN

    1. Place a Dynamic TWAIN control in a dialog.
    2. Press Ctrl-W to invoke MFC ClassWizard.
    3. In the MFC ClassWizard dialog box, click Member Variables tab, as seen in the following figure:
    4. In the MFC ClassWizard dialog box, click Add Variable button.
    5. In the Add Member Variable dialog box, input m_DynamicTwain (or other name) in the Member Variable Name edit box, click OK.
    6. From this point on, you can call the member functions of the m_DynamicTwain to communicate with the ActiveX Control. Every property or method in Dynamic TWAIN ActiveX Control has corresponding function in m_DynamicTwain.

    3. Adding an Event Handler

    1. In the MFC AppWizard dialog box, click Message Maps tab. In this page, all the Events of Dynamic TWAIN are listed, as seen in the following figure:
    2. You can select the event you want to handle, such as OnPostTransfer, then click Add Function to add an event handler.
    3. In the Add Member Function dialog box, click OK.
    4. Add code in the event handling function.