winforms qr code reader

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One possible solution to that would be to store everything you need on your laptop, encrypt the laptop s hard disk, and work with only this set of data. If you choose a good and strong password, your documents are secure but what if your laptop gets stolen I guess you want to keep a copy of the document on your network at home, where it gets backed up. But when you work on a document on your laptop, you have to synchronize the differences between that document and the one you left at home. Wouldn t it be better if you could work like you were at home or in your office at your desktop computer And for administrators, sometimes it is enough to use SSH to log into one of the machines at work. But what if you need to mount an internal share to the machine you are working on There is a better solution to those problems: virtual private networks (VPNs). In this chapter, you ll learn what a VPN is and how to set up a VPN. You ll take a look at three different ways to set up VPNs, although there are many more. Also, you ll learn how to give out VPN access to other people and how to generally configure your client and your VPN server.

Because the card reader s software consisted of Windows dynamic link libraries (DLLs), I used the Java Native Interface (JNI) to provide the bridge between Java and the native code that interacted with these DLLs a messy business. My job would have been much easier if the version of Java that I worked with had provided an API for communicating with smart cards. Fortunately, Sun has finally addressed this situation by providing the Smart Card I/O API and the SunPCSC security provider in its Java SE 6 reference implementation.

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The first example started off by changing the database context to the AdventureWorks database: USE AdventureWorks GO Since the OBJECT_NAME function is database-context sensitive, changing the database context ensures that you are viewing the proper object name. Next, the SELECT clause displays the object name, index ID, description, and average fragmentation percent: SELECT OBJECT_NAME(object_id) ObjectName, index_id, index_type_desc, avg_fragmentation_in_percent The index_type_desc column tells you if the index is a heap, clustered index, nonclustered index, primary XML index, or secondary XML index. Next, the FROM clause referenced the sys.dm_db_index_physical_stats catalog function. The parameters were put in parentheses, and include the database name and NULL for all other parameters except the scan mode: FROM sys.dm_db_index_physical_stats (DB_ID('AdventureWorks'),NULL, NULL, NULL, 'LIMITED') Since sys.dm_db_index_physical_stats is referenced like a table (unlike 2000 s DBCC SHOWCONTIG), the WHERE clause is used to qualify that only rows with a fragmentation percentage of 31% or greater be returned in the results: WHERE avg_fragmentation_in_percent > 30 The query returned several rows for objects in the AdventureWorks database with a fragmentation greater than 30%. The avg_fragmentation_in_percent column shows logical fragmentation of nonclustered or clustered indexes, returning the percentage of disordered pages at the leaf level of the index. For heaps, avg_fragmentation_in_percent shows extent level fragmentation. Regarding extents, recall that SQL Server reads and writes data at the page level. Pages are stored in blocks called extents, which consist of eight contiguous 8KB pages. Using the avg_fragmentation_in_percent, you can determine if the specific indexes need to be rebuilt or reorganized using ALTER INDEX. In the second example, fragmentation was displayed for a specific database, table, and index. The SELECT clause included a reference to the index name (instead of index number): SELECT OBJECT_NAME(f.object_id) ObjectName, i.name IndexName,

f.index_type_desc, f.avg_fragmentation_in_percent The FROM clause included the specific table name, which was converted to an ID using the OBJECT_ID function. The third parameter included the index number of the index to be evaluated for fragmentation: FROM sys.dm_db_index_physical_stats (DB_ID('AdventureWorks'), OBJECT_ID('Production.ProductDescription'), 2, NULL, 'LIMITED') f The sys.indexes system catalog view was joined to the sys.dm_db_index_physical_stats function based on the object_id and index_id. INNER JOIN sys.indexes i ON i.object_id = f.object_id AND i.index_id = f.index_id The query returned the fragmentation results just for that specific index.

A virtual private network is a network that connects two private networks over another network like the Internet or that connects your local machine to a network over the Internet You can use a virtual private network when sitting in a hotel room and you absolutely need to access your music collection because you forgot to take that one album with you that you want to listen to Or you want to connect site A of your company with the main office s intranet so people working at site A can edit documents that are available only on the file server located at the headquarters Connecting machines of employees to the internal network is the most likely reason that you want to use a VPN, because this gives them the ability to work on internal data from (nearly) wherever they are.

Caution Because the Smart Card I/O API and SunPCSC provider are not part of the Java SE 6 specification, they are only guaranteed to be available as part of Sun s reference implementation.

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