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The last APR data structure you generally see in the Subversion API is the variable-length array, which you access through an apr_array_header_t. An array can be allocated via apr_array_make(), which takes as its arguments a pool, the number of items to initially allocate, and the size of the items to allocate. Then items can be added to it via apr_array_push() and removed via apr_array_pop(). If you push on more items than the array has room for, more space will be allocated; and if you pop off more than are stored in the array, NULL will be returned. Unlike most other APR data structures, apr_array_header_t isn t opaque, so to iterate over it you should look at its nelts and elts members. As usual, an example makes the use clearer (see Listing 8-6). Listing 8-6. Using Variable-Length Arrays void demonstrate_apr_arrays (apr_pool_t *pool) { /* make an array with 2 slots in it */ apr_array_header_t *array = apr_array_make (pool, 2, sizeof (char *)); /* push two strings onto the array */ (*(char **) apr_array_push (array)) = "foo"; (*(char **) apr_array_push (array)) = "bar"; /* push another one on, this causes the extra spot to be allocated */ (*(char **) apr_array_push (array)) = "baz"; /* iterate over them */ for (int i = 0; i < array->nelts; ++i) { printf ("%s\n", ((char **) array->elts)[i]); } { /* try to pop off the lastitem */ char **item = apr_array_pop (array); if (item) { /* use it */ } } }

SELECT Player.PlayerID, Player.PlayerName AS Name, Manufacturer.ManufacturerName AS Manufacturer, Player.PlayerCost AS Cost, Player.PlayerStorage FROM Player INNER JOIN Manufacturer ON Player.PlayerManufacturerID = Manufacturer.ManufacturerID You can see the results in Figure 7-10.

Note that the activity serves as its own listener for check box state changes, since it implements the OnCheckedChangeListener interface (via cb.setOnCheckedChangeListener(this)). The callback for the listener is onCheckedChanged(), which receives the check box whose state has changed and the new state. In this case, we update the text of the check box to reflect what the actual box contains. What s the result Clicking the check box immediately updates its text, as shown in Figures 5 4 and 5 5.

An important difference between Subversion and many other version control systems is that like CVS, Subversion s mode of operation is nonlocking. That means that if two users have checked out working copies that contain the same file, nothing prohibits both of them from making changes to that file. For users of systems such as Visual SourceSafe, this may seem odd, as there is no way to ensure that the two users changes to the file don t conflict with each other. In truth, this is by design. In the vast majority of cases, the two users changes don t conflict. Even if the two users change the same file, it s likely that they ll change separate parts of the file, and those disparate changes can easily be merged together later. In this kind of situation, allowing one user to lock the file would result in unneeded contention, with one user forced to wait until the other has completed his changes. Even worse is the situation in which the second user changes the file despite the fact that the file is locked. When the first user completes his change and unlocks the file, the second user is stuck merging the changes together manually, introducing an element of human error into something that the computer can handle far better.

Figure 7-10. Column aliases appear as column headers. Although the column headings are now more readable, the data that is displayed may not be quite correct. This is where explicitly defining the columns that you want to display comes into its own.

The Motorola DROID (or Milestone, as it is known outside the United States) is a WVGA854 device, originally shipping with Android 2.0, though most of these devices will now be running Android 2.0.1. The DROID, like the CLIQ, has a D-pad on the side-slider keyboard, meaning the D-pad is not readily available to users when the device is in portrait mode. Because the DROID has a WVGA854 screen on a normal phone-sized device, Android will consider the DROID to have a high-density screen, so -hdpi resource sets will be used.