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The example I am going to use writes to a table within an Access database from inside an Excel workbook VBA works exactly the same in all Microsoft Office applications, except that the object model is obviously too different from application to application to take the functionality of the application into account First, you will need to create a sample table in an Access database for your code to send data to To do this, click Create in the menu bar and then click the Table Design icon in the Tables group of the ribbon Create a single text field called MyText Data Type must be specified as text Save the table by giving it the name TestAccess A dialog box will appear requesting a primary key to be defined For the purposes of this example, a primary key is not required so answer No Load Excel Once you load Excel, you need to enter the VBA code window This works exactly the same as in Access: press ALT+F11 The code window has exactly the same functionality as the one you are used to in Access When you used a different application from Access, you had to put in a reference to the Object Library file first We have to do the same thing in Excel by putting in a reference to the Access Object Library in order to tell Word how to find the Access object model However, because Access uses more than one object library, we need to put a second reference in to DAO (Data Access Objects) as well Use Tools | References from the Visual Basic Editor menu as before, but this time select the Microsoft Access Object Library and the Microsoft DAO Object Library and check the boxes next to these libraries, as shown in Figure 17-3 In terms of version numbers for the object libraries, select the highest version number available This now gives your code all it needs to manipulate Access Insert a module by selecting Insert | Module from the Code menu, and then enter the following code The code assumes that you have a database at "C:\Temp\TestAccessaccdb":.

Click End to display the ending time or date in either the Start or End field Click Recurrence Range End or Recurrence Range Start to show when

Click Start to show when an appointment begins Click the End button if the new field is to replace the End field Click OK to close the dialog box

Sub Test_Access() Dim oAApp As AccessApplication, oRSet As DAORecordset Set oAApp = CreateObject("AccessApplication") oAAppOpenCurrentDatabase "C:\Temp\TestAccessaccdb" Set oRSet = oAAppCurrentDbOpenRecordset("MyTable") oRSetAddNew oRSet!MyText = "Test String" oRSetUpdate oRSetClose Set oRSet = Nothing Set oApp = Nothing End Sub

The location of the Light sensor on your robot is very important to how well the robot will respond when doing line following, and a great deal of the location choice it depends on what type of lines you plan on following. If the Light sensor is located close to the pivot point on your robot, as in Figure 5 1, the corrections the robot makes will be very drastic on a sharp curve. When using a differential steering robot, recall that the pivot point is the midway point of the track, and the track is the distance between the two drive wheels. Put the sensor close to this point, and the robot will overshoot a curve more quickly and will be forced to make drastic corrections to get back on track, thus making the robot seem very jerky when traveling a curved path. On the other hand, if the robot will be commonly following straight lines, having the Light sensor close to the pivot point will give a very smooth response.

6 After you have made your selection from the Available Date/Time Fields list,

7 Click End to have it appear in the End field 8 Click the Select Available Fields From down arrow to open a list of other

When this is run, it will open a database called TestAccess in the path C:\Temp\ and will then add a new record to your sample table MyTest The code creates an object oAApp to hold the Access application object, and an object called oRSet to hold the DAO recordset The variable oAApp is set to an Access application

view that shows only specific types of appointments For example, you can create a view that shows only management meetings or family events

301 301

Figure 17-3

You can also open the Advanced View Settings dialog box from a Day, Work Week, Week, or Month view by right-clicking an empty part of your Calendar grid and

by using the CreateObject method This is exactly the same as if you had opened Access directly and chosen a blank database Next, the oRSet object is set to point to your sample table MyTable This is the same as if you had double-clicked the table name in Access and opened it as a data sheet A new record is added and the field MyText is set to Test String Notice that an exclamation mark is used instead of a dot The recordset is then updated and closed and the two objects are set to Nothing to release memory As explained previously, it is very important to be sure to properly close and set to Nothing any objects created within VBA code Otherwise, the memory consumed is left hanging and is unable to be used by other applications later This can cause problems for users when they exit your application, because an application was not properly terminated and is holding memory that may be needed I hope this has given you a taste of the immense power of the VBA language and how you can manipulate other Microsoft applications from within it