barcode programming in c# Figure 13-9. Stored procedure database exception message in vb

Integrating Data Matrix ECC200 in vb Figure 13-9. Stored procedure database exception message

The detach verb has one very useful flag, -force, which (obviously) you use only when you have to force a disk image to unmount. The attach verb, on the other hand, has a variety of options. The -readonly flag will mount the volume strictly for viewing. The -nomount flag, as you might guess, doesn t actually mount the volume, which can be useful if, for example, you want to run disk utilities against it. If you want to mount the disk image at a path other than the default /Volumes directory, you can use the -mountroot flag followed by the directory path you prefer. Another commonly used flag, -owners, (followed by on or off) comes in handy. Set to off, this causes the drive to act much like one plugged into a system when you ve checked the box to ignore permissions. We highly recommend that you always mount the disk image with ownership off; otherwise it s very easy to corrupt permissions----not good when you intend to duplicate this image to hundreds of computers in your fleet. Obviously, you d prefer that the original permissions persist. There are other flags, but these are the ones we find ourselves using most often. CAUTION: Whenever you work on a base-image volume or disk image, ensure that the volume is mounted with permissions enforced, otherwise you may corrupt permissions on your base model. This means that if you make changes you would need to do so with elevated privileges on your own system so as not to take ownership of files and then make sure to chmod based on the UID of the user(s) on the target system rather than your own. Next, let s say you want to burn that DMG file to optical media. Accomplishing the task is simple using the burn verb and referencing the image file, as you can see in the following:

You declared a VB 9.0 implicitly typed local variable, custs, of type var:

Wherever you decide to create a forum, you ll notice an explosion of options, compared with those available in phpBB 2.0. Figure 8-26 shows the phpBB 3.0 form for creating a new forum.

One common issue faced with file system security is related to a low level file system capability known as hard links. A hard link in generic terms is a legal occurrence of the same file on a file system in multiple directories. When created, a hard link serves simply as a reference to an existing file, and the link maintains the exact same attributes as its source file. Thus, if ownership, mode, or even the containing data is changed on a link, those exact same changes will be realized on the source file. In OS X, and indeed most POSIX-compliant systems supporting hard links, a user can create a hard link to any file to which they have read access, as long as they have write access to the destination that they specify, and that destination resides on the same file system as the source file. As in most default OS X environments a user will have at least some file system path to which they have write access, this can present a fairly significant security issue. For instance, consider a user who logs into a system and has a local home directory on that system. Next, consider all of the various system configuration files, which have world-readable access (hint, take a look at /etc/). Through the use of hard linking, a user with a shell account and a home directory can potentially exploit any of these worldreadable files. To do so, they simply create a hard link to the file in their own home directory, using the ln command as shown here:

) (allow process-exec file-read-data file-read-metadata (literal "/usr/local/bin/sbshell"))

Log in to the Administration panel, click Management under Forum Admin in the navigation pane, and take a look at the screen. Chances are it resembles Figure 8-8.