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It isn t that surprising that embedding Windows Forms code in WPF is fairly straightforward. After all, they re both .NET technologies using the .NET runtime. Even though it s a little bit harder to embed things like ActiveX (or even straight C++ controls), it isn t that much harder at least for simple cases.

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} catch(char *str) { cout << "Caught a string: "; cout << str << '\n'; } } int main() { cout << "Start\n"; Xhandler(1); Xhandler(2); Xhandler(0); Xhandler(3); cout << "End"; return 0; } C++

2021 Embedding ActiveX controls in WPF For many years, ActiveX was the primary technology for interoperability and for thirdparty controls For this reason, a lot of ActiveX controls are still running around, causing havoc, and people are still using them WPF doesn t have any direct support for using ActiveX controls But, Windows Forms does; and, as you ve just seen, WPF can use Windows Forms relatively easily We think you know where this is going Yes, we first create a Windows Forms control that contains our ActiveX control Then we embed the Windows Forms control into our WPF code using the WindowsFormsHost To add an ActiveX to a Windows Forms control is pretty easy with Visual Studio First, create a new UserControl called SystemMonitorHolder Why Because the ActiveX control we re going to embed is the SystemMonitor control, which should already be available on your system.

This program produces the following output:

traffic like DHCP, SNMP, and so on All other connections are established based on the services that are provisioned For pre-provisioned services, connections are set up during the registration of the SS associated with the service Other connections may be established on an ongoing basis to support new services or to modify existing services A connection can be terminated when the service associated with it is no longer needed, such as when a customer s service contract expires Just like connections, service flows are also central aspects of the WiMAX MAC protocol Concurrent with the notion of connections, WiMAX uses the notion of service flow, which identifies services Every data transport service provided by the WiMAX network is associated with a service flow Each service flow is uniquely identified by a 32-bit SFID number and is associated with a connection through which it provides the transport service Associated with each service flow are three sets of QoS parameters that define the QoS characteristic and the corresponding state of the service flow

#: 1 #: 2 Value is zero #: 3

As you can see, each catch statement responds only to its own type In general, catch expressions are checked in the order in which they occur in a program Only a matching statement is executed All other catch blocks are ignored

Next, right-click the Toolbox, and select Choose Items The dialog takes a while to come up When it does, switch to the COM Components tab (figure 2010) Scroll down in the list until you find the System Monitor Control, check it, and then click OK Again, it will take a little while, but then System Monitor Control will show up in the Toolbox Now you can drag it on to the user control you just created (figure 2011) We ve made the user control a little bit bigger to accommodate the ActiveX control We ve also set the Dock property of the control to Fill so that it takes up the entire user control.

You need to be careful how you order your catch statements when trying to catch exception types that involve base and derived classes because a catch clause for a base class will also match any class derived from that base Thus, if you want to catch exceptions of both a base class type and a derived class type, put the derived class first

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in the catch sequence If you don t do this, the base class catch will also catch all derived classes For example, consider the following program

When we put the control into the WPF window, the user control will automatically be sized based on layout, but that won t do us any good if the control on the user control isn t set to size with it We re halfway there Now you have to put the control onto the WPF dialog Again, you drag a WindowsFormsHost onto the window, position it appropriately, and then manually set its content in XAML..