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In addition to these exceptions, the exception handling for unmanaged code also includes common runtime errors. For example, take the case of a simple divide-by-zero error. We would expect to receive a DivideByZeroException for this type of error in our managed code. To test this type of error in unmanaged code, we write a simple unmanaged function that divides the two numbers we pass in: int DivideSomeNumbers(int numOne, int numTwo) { return numOne / numTwo; } We declare it and test it like this in C# code: [DllImport("FlatAPILib.DLL")] public static extern int DivideSomeNumbers(int numOne, int numTwo); try { //cause an error in the unmanaged code by dividing by zero int result = ErrorAndExceptionTest.DivideSomeNumbers(1, 0); Console.WriteLine("Result from DivideSomeNumbers = {0}", result); } catch(DivideByZeroException e) { Console.WriteLine( "DivideByZeroException from DivideSomeNumbers: {0}", e.Message); } As expected, we receive the same DivideByZeroException that we would have received from managed code: DivideByZeroException from DivideSomeNumbers: Attempted to divide by zero. We can also catch other common exceptions such as an AccessViolationException. The badly written unmanaged function that follows attempts to use an unallocated pointer: int UnmanagedRuntimeError() { //we force a problem below by using //these invalid pointers char* unAllocatedPointer = NULL; char* sourcePointer = NULL; //this should cause a problem strcpy(unAllocatedPointer, sourcePointer); return 0; }

CAUTION Make sure that you save the source of any trigger, key, and index definitions that you want to keep before submitting a RECREATE TABLE request!

If the table is in use when you submit the DROP or RECREATE statement, the request will be denied, with an Object xxxxx is in use message. Always take a backup before any activity that changes metadata. Although it is possible to make metadata changes when users are online, it is not recommended, especially for radical changes like dropping and re-creating tables. If necessary, force users off and get exclusive access. Instructions for getting exclusive access are in 39.

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When a user is navigating through a web application, it is useful to store user- or sessionspecific data on the web server so it is easy to access each time a page is requested This can be information about the user, user preferences, or data related to the application, such as data in a shopping chart Each time the user requests a page that contains a call to the session_start() function, the server will start a new process (or reuse an idle), and the PHP engine will look for a session ID in the query string or cookie data This will fetch the saved session data and build the $_SESSION array As mentioned in recipe 10-5, $_SESSION is a superglobal and can be accessed directly from any code segment When a session is active, it is possible to retrieve, add, update, and delete values from the $_SESSION array.

Firebird does not currently provide any form of temporary table that is managed as such by the system. It has less need for them than many other DBMSs have. For example, Firebird has the capability to output a virtual table directly from a stored procedure that is written with a specific syntax. For more about this, see Selectable Stored Procedures in s 29 and 30.

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We declare and call the function like this: [DllImport("FlatAPILib.DLL")] public static extern int UnmanagedRuntimeError(); try { int result = ErrorAndExceptionTest.UnmanagedRuntimeError(); Console.WriteLine( "Result from UnmanagedRuntimeError = {0}", result); } catch(AccessViolationException e) { Console.WriteLine( "Exception from UnmanagedRuntimeError: {0}", e.Message); } The intentional pointer problems we coded into this unmanaged function turn into an AccessViolationException in our C# code: Exception from UnmanagedRuntimeError: Attempted to read or write protected memory. This is often an indication that other memory is corrupt. Now, let s see what happens when the unmanaged code explicitly throws an exception rather than causing one to occur as a byproduct of some operation. To test this, we implement a function that doesn t do anything except throw an exception: #include <exception> //needed for std::exception int UnmanagedRuntimeException() { //throw a standard library exception throw std::exception("My new exception"); } The declaration and test in C# look like this: [DllImport("FlatAPILib.DLL")] public static extern int UnmanagedRuntimeException(); try { //will always return a result code of x80004005 which is E_FAIL. //The same error code is returned for a structured //exception thrown via a call to RaiseException, //or for a simple C++ style throw statement. int result = ErrorAndExceptionTest.UnmanagedRuntimeException();

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