It will help you to copy extract audio tracks, or even parts of them, to the harddisk. In newer versions it also includes some audio CD writing routines and a small audio editor. Using these secure modes, every sector read will be doublechecked and reread or corrected if necessary. On many drives the extraction is not error free, thus these routines will make sure the track is read correctly.
For example, an application that does not care about crash recovery or rollback might make the open of a journal file a no-op. SQLite might also add one of the following flags to the xOpen method: It is not used to indicate the file should be opened for exclusive access.
The xOpen method does not have to allocate the structure; it should just fill it in. The file can be a directory. The exact size of the output buffer is also passed as a parameter to both methods. Since this is handled as a fatal error by SQLite, vfs implementations should endeavor to prevent this by setting mxPathname to a sufficiently large value.
The xRandomness function attempts to return nBytes bytes of good-quality randomness into zOut. The return value is the actual number of bytes of randomness obtained. The xSleep method causes the calling thread to sleep for at least the number of microseconds given.
The xCurrentTime method returns a Julian Day Number for the current date and time as a floating point value. The xCurrentTimeInt64 method returns, as an integer, the Julian Day Number multiplied by the number of milliseconds in a hour day.
By overriding system calls with functions under its control, a test program can simulate faults and error conditions that would otherwise be difficult or impossible to induce.
The set of system calls that can be overridden varies from one VFS to another, and from one version of the same VFS to the next. Applications that use these interfaces must be prepared for any or all of these interfaces to be NULL or for their behavior to change from one release to the next.
Applications must not attempt to access any of these methods if the iVersion of the VFS is less than 3. Each subclass will be tailored to the specific needs of the module implementation. The purpose of this superclass is to define certain fields that are common to all module implementations.
When no rows match an aggregate query, the xStep callback of the aggregate function implementation is never called and xFinal is called exactly once.
The first parameter must be a copy of the SQL function context that is the first parameter to the xStep or xFinal callback routine that implements the aggregate function.
This routine must be called from the same thread in which the aggregate SQL function is running. The idea here is that xEntryPoint is the entry point for a statically linked SQLite extension that is to be automatically loaded into all new database connections. Even though the function prototype shows that xEntryPoint takes no arguments and returns void, SQLite invokes xEntryPoint with three arguments and expects an integer result as if the signature of the entry point where as follows: No entry point will be called more than once for each database connection that is opened.
SQL parameters are tokens of the form "? This routine actually returns the index of the largest rightmost parameter. For all forms except? NNN, this will correspond to the number of unique parameters.
If parameters of the? NNN form are used, there may be gaps in the list. A zero is returned if no matching parameter is found. SQL parameters of the form "?
In other words, the initial ": Parameters of the form "? The first host parameter has an index of 1, not 0.
Passing any other pointer in to this routine results in undefined and probably undesirable behavior. The BLOB handle is closed unconditionally. Even if this routine returns an error code, the handle is still closed. If the blob handle being closed was opened for read-write access, and if the database is in auto-commit mode and there are no other open read-write blob handles or active write statements, the current transaction is committed.
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