We recommend our companion text Microsoft® Access® Inside. Out by Jeff .. 2. Find “Download the complete PDF of this book,” and click the book title. Understanding the VBA Language Features.. Part 2: Access Object Model and Data Access Objects (DAO). Chapter 4. Applying the Access Object Model. Trademarks: Wiley, the Wiley Publishing logo, For Dummies, the Dummies Man logo, A Reference for the. Rest of Us!, The Dummies Way, Dummies Daily, The.
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Access VBA Programming For Dummies · Read more Microsoft Access VBA Programming Inside Out · Read more. Microsoft and Access are registered trademarks of Microsoft Cor- guages and databases Mic Microsoft Excel VBA Programming for Dummies pdf - . The material in this eBook also appears in the print version of this title: ISBN: Microsoft Excel VBA Programming for Dummies pdf -.
References to the different libraries must be created within the VBA client before any of the methods, objects, etc.
This is achieved through what is referred to as Early or Late Binding. These application objects create the OLE link to the application when they are first created. Commands to the different applications must be done explicitly through these application objects in order to work correctly. As an example, VBA code written in Microsoft Access can establish references to the Excel, Word and Outlook libraries; this allows creating an application that for instance runs a query in Access, exports the results to Excel and analyzes them, and then formats the output as tables in a Word document or sends them as an Outlook email.
The language provides a user interface in the form of UserForms, which can host ActiveX controls for added functionality. Using VBA, most of the security features lie in the hands of the user, not the author. The VBA host application options are accessible to the user.
The user who runs any document containing VBA macros can preset the software with user preferences. End-users can protect themselves from attack by disabling macros from running in an application or by granting permission for a document to run VBA code only if they are sure the source of the document can be trusted.
It became an instant success among developers to create corporate solutions using Excel. The file becomes a trusted document. The following image is an example of Always enable this document's active content and Advanced Options.
The following image is a larger example of the Enable Content options. In this state, the ActiveX control does not run. A kill bit is security feature that instructs an ActiveX control to never use a piece of ActiveX software, for instance by closing a security vulnerability, by or preventing code from running. Top of Page Enable ActiveX controls for one time when the Security Warning appears Use the following instructions to enable controls for the duration of time that the file is open.
When you close the file, and then reopen it, the warning appears again. Select Advanced Options. The following image is an example of the Security Warning area when ActiveX controls can be enabled for the duration of time that the file is open.
Notes: If the file contains a Visual Basic for Applications VBA project, for example, and a macro-enabled Microsoft Excel file, the Trust Center is more restrictive, because the file may contain macros. The RelinkTables procedure then calls a separate function, FindDataFile, which will return the actual location of the data file, if it can find it. This is where the code has to be a little flexible. Access has variations on its file extensions and I had to allow for different ones depending on the program edition and whether I was using a development version.
In this way, the location string is assembled if the file exists. If it finds a file in one of those places, it verifies the file as shown in the next section before returning its location to the RelinkTables procedure.
Is the Data Valid? Assuming the program has found a data file, it now checks to see if the file is actually valid. While reviewing the code for this article, I decided to tidy that up and have the RelinkTables routine do it instead. Functions are supposed to focus on returning the requested values, not performing file operations. Just tell me we have some data!!
If the actual path of the data file is the one already shown in the MSysObjects, even if DataStoreLocation had to restore it from the Data subdirectory, everything is good. The table links will work.
Do nothing. If the actual path differs from the one shown in MSysObjects, this either means the program files have been moved or the user has just installed the program.
Relink all the tables to the new data file. If the data file was found in the.