1. Uwe Habermann Uwe@VandU.eu Venelina Jordanova Venelina@VandU.eu Usage of VFP code in the back- end of Silverswitch applications

2. VFP COM server * Can be used in any Silverlight application * Browser * At the client side * OOB with elevated trust * At the server side * At the client side * Silverlight client executes method in VFP COM server

3. VFP COM server * Execution of FXP * Execution of APP * Advantages: * COM server need not be re-registered * IIS need not be restarted

4. VFP COM server * Data access * Cursoradapter * VFP database * SQL database * All ODBC data sources * MySQL * Oracle * DB2 *…*… * Set-up database to use

5. VFP COM server * Business logic * Everything, but nothing visible (no user interface)

6. VFP COM server * DEFINE CLASS COMTastrade AS SESSION OLEPUBLIC * Build as “Multi-threaded COM server (dll)” * VFP9.exe must be started with Administrator rights explicitly!

7. VFP COM server DEFINE CLASS COMTastrade AS SESSION OLEPUBLIC PROCEDURE GetCustomers() USE Customer IN 0 SHARED CURSORTOXML("Customer", "lcXML", 1, 2, 0, "1") USE IN Customer RETURN lcXML

8. Use VFP COM server at the server side * “early binding” in Visual Studio * COM server must work at development time * Reference to COM server must be added to the server project

9. Call a VFP function private void xpgfPageFramePage1cmdProper_Click( object sender, RoutedEventArgs e) { VfxSystemDomainContext context = new VfxSystemDomainContext(); EventHandler handler = new EventHandler(ExecuteVFPCommand_Completed); var ExecuteVFPCommand = context.ExecuteCommandService("proper", xpgfPageFramePage1txtCustomername.Text.ToString(), VfxAppObject.CurrentConnectionInfo.ClientName); ExecuteVFPCommand.Completed += handler; }

10. Call a VFP function void ExecuteVFPCommand_Completed( object sender, EventArgs e) { var result = sender as InvokeOperation ; VfxCommandServiceResultBase ValueResult = (VfxCommandServiceResultBase)VfxSerializer. DeserializeObject (result.Value); lblResult.Text = ValueResult.CommandServiceInfo.result; }

11. Action Button * Progammatical call of COM server method, procedure or new instance of an object from the client side * Call from Button * Demo

12. Action Button * Pass multiple parameters * Pass data as parameter

13. Any questions?

14. Thank you very much and have fun with Silverlight Venelina & Uwe