Synchronizing the Drive, Directory, and File List Boxes
The drive, directory, and file list boxes are almost always
used together to obtain a file name. As such, it is important that
their operation be synchronized to insure the displayed information
is always consistent.
When the drive selection is changed (drive box Change event),
you should update the directory path. For example, if the drive box is
named drvExample and the directory box is dirExample, use the code:
Notice what happens as you resize the two boxes. Notice the layer
effect when you move one box on top of the other. Notice the effect of
the image box Stretch property. Play around with different file
types - what differences do you see?
dirExample.Path = drvExample.Drive
When the directory selection is changed (directory box Change
event), you should update the displayed file names. With a file box named
filExample, this code is:
filExample.Path = dirExample.Path
Once all of the selections have been made and you want the
file name, you need to form a text string that correctly and
completely specifies the file identifier. This string concatenates
the drive, directory, and file name information. This should be an
easy task, except for one problem. The problem involves the backslash
(\) character. If you are at the root directory of your drive, the path
name ends with a backslash. If you are not at the root directory, there
is no backslash at the end of the path name and you have to add one before
tacking on the file name.
Example code for concatenating the available information
into a proper file name and then loading it into an image box is:
Note we only use properties of the file list box. The drive and
directory box properties are only used to create changes in the
file list box via code.
