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Delete On Prompt = This option asks you each time. Handheld = Any deletion on your BlackBerry is not sent to your main mailbox. Mailbox & Handheld = Deletions are synchronized or shared between your mailbox and your BlackBerry.

wchar_t* family; wchar_t* genus; wchar_t* species; public: PlantData(const wchar_t* botanical_name) { // Let's assume this method // populates its // fields with data from the database. } }; // The following managed class contains a pointer to a native class. ref class TreeSpecies { PlantData* treedata; public: TreeSpecies(String^ genus, String^ species) { String^ botanical_name = gcnew String(genus + " " + species); // Use the Marshal class to create a pointer. // The managed class corresponding to a // pointer is IntPtr. IntPtr ip = Marshal::StringToHGlobalAnsi(botanical_name); // Cast that to the appropriate pointer type. const wchar_t* str = static_cast<const wchar_t*>(ip.ToPointer()); treedata = new PlantData(str); Marshal::FreeHGlobal( ip ); } ~TreeSpecies() { this->!TreeSpecies(); } !TreeSpecies() { if (treedata) delete treedata; } }; Don t worry too much about the details of the conversions from String to wchar_t* this is typical of the kind of type conversions you need to do when mixing managed and native code. We re simply using the Marshal class defined in the .NET Framework to create, ultimately, a

avg_col_len (analyze)

Wireless Reconcile On = Yes, share deletions and other information between your BlackBerry and main mailbox. Off = No, don t share information.

20 3

On Conflicts Lastly, you can choose whether your server or your handheld wins if there is a reconciliation conflict. default The setting is Mailbox Wins, which means that your main e-mail box changes win over changes from your BlackBerry.

pointer to a character array The term marshal is a synonym for convert, although usually it suggests converting parameters from native to managed and vice versa in the context of a function call from managed to native code However, it has come to mean converting between native and managed objects in a general sense More information on marshaling will be discussed in 12 We include the native type PlantData as a pointer, but it would be illegal to include the native type by value Including a pointer to the native heap creates code that cannot be verified to be safe, since the runtime has no way of knowing whether you are accessing a valid native pointer Thus, you cannot have a native pointer or a native class in a class when compiling with /clr:safe.

Total for Table (analyze)

TIP: If you want to be able to delete e-mail messages from your BlackBerry and not have it also delete from your main e-mail inbox, then set the Wireless Reconcile field to Off.

4 4 500

IMPORTANT: If you choose Mailbox and Handheld and set Wireless Reconcile to On, then whenever you delete e-mail messages from your BlackBerry, they will also be deleted from your regular e-mail inbox and vice-versa.

You can, however, use pointers when compiling with /clr:pure, because a pointer itself doesn t result in the generation of native code The intermediate language is actually capable of representing pointers even if they are not verifiable This is exactly what happens in C# when in an unsafe block Finally, we include a destructor and finalizer in the type The delete is called from the finalizer, not the destructor, and we call the finalizer from the destructor You ll see more about this later this chapter, but in this case it s necessary to make sure that the native pointer is freed even if the destructor is never called A more robust way to do this by writing a template class to embed the native pointer will be discussed in 12, after managed templates and some other background have been covered.