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Once you have generated an interop assembly, your .NET applications are now able to make use of their types using early binding or late binding techniques. Given that you have already seen how to create a COM type using early binding at the opening of this chapter (via the VB 2005 New keyword), let s turn our attention to activating a COM object using late binding. As you recall from 14, the System.Reflection namespace provides a way for you to programmatically inspect the types contained in a given assembly at runtime. In COM, the same sort of functionality is supported through the use of a set of standard interfaces (e.g., ITypeLib, ITypeInfo, and so on). When a client binds to a member at runtime (rather than at compile time), the client is said to exercise late binding. By and large, you should always prefer the early binding technique using the VB 2005 New keyword. There are times, however, when you must use late binding to a coclass. For example, some legacy COM servers may have been constructed in such a way that they provide no type information whatsoever. If this is the case, it should be clear that you cannot run the tlbimp.exe utility in the first place. For these rare occurrences, you can access classic COM types using .NET reflection services. The process of late binding begins with a client obtaining the IDispatch interface from a given coclass. This standard COM interface defines a total of four methods, only two of which you need to concern yourself with at the moment. First, you have GetIDsOfNames(). This method allows a late bound client to obtain the numerical value (called the dispatch ID, or DISPID) used to identify the method it is attempting to invoke. winforms ean 13 reader EAN-13 .NET WinForms DLL - Create EAN-13 barcodes in .NET with
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... symbology developed to be used in a non-retail environment. It can be decoded with virtually any barcode reader. WinForms Barcode control for Ean\UPC ... In COM IDL, a member s DISPID is assigned using the [id] attribute If you examine the IDL code generated by Visual Basic (using the OLE View tool), you will see that the DISPID of the Add() method has been assigned a DISPID such as the following: [id(0x60030000)] HRESULT Add( [in] short x, [in] short y, [out, retval] short* ); This is the value that GetIDsOfNames() returns to the late bound client Once the client obtains this value, it makes a call to the next method of interest, Invoke() This method of IDispatch takes a number of arguments, one of which is the DISPID obtained using GetIDsOfNames() In addition, the Invoke() method takes an array of COM VARIANT types that represent the parameters passed to the function In the case of the Add() method, this array contains two shorts (of some value). TypeName: System.Management.Automation.FunctionInfo Name ---CommandType Definition Name Options ScriptBlock MemberType ---------Property Property Property Property Property Definition ---------System.Management.Automation.CommandTypes Command... System.String Definition {get;} System.String Name {get;} System.Management.Automation.ScopedItemOptions Op... System.Management.Automation.ScriptBlock ScriptBl... winforms ean 13 reader Free BarCode API for .NET - CodePlex Archive
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How to read, scan EAN-13 linear barcode image in .NET applications using ... Mature and high-quality barcode reader /scanner for Microsoft . ... NET WinForms The report obsolete command reports on any obsolete backups. Always run the crosscheck command first in order to update the status of the backups in the RMAN repository to that on disk and tape. In the following example, the report obsolete command shows no obsolete backups: RMAN> crosscheck backup; RMAN> report obsolete; RMAN retention policy will be applied to the command RMAN retention policy is set to redundancy 1 no obsolete backups found The following execution of the report obsolete command shows that there are both obsolete backup sets and obsolete archived redo log backups. Again, run the crosscheck command before issuing the report obsolete command. RMAN> crosscheck backup; RMAN> report obsolete; The final argument of Invoke() is another VARIANT that holds the return value of the method invocation (again, a short) Although a NET client using late binding does not directly use the IDispatch interface, the same general functionality comes through using the SystemReflection namespace To illustrate, the following is another VB 2005 client that uses late binding to trigger the Add() logic Notice that this application does not make reference to the assembly in any way and therefore does not require the use of the tlbimpexe utility Imports SystemReflection Module Program Sub Main() ConsoleWriteLine("***** The Late Bound NET Client *****") ' First get IDispatch reference from coclass Dim calcObj As Type = _ TypeGetTypeFromProgID("SimpleCOMServerComCalc") Dim calcDisp As Object = ActivatorCreateInstance(calcObj) ' Make the array of args Dim addArgs() As Object = {100, 24} ' Invoke the Add() method and obtain summation. RMAN retention policy will be applied to the command RMAN retention policy is set to redundancy 1 Report of obsolete backups and copies Type Key Completion Time Filename/Handle -------------------- ------ ------------------ -------------------Backup Set 1 07-APR-07 Backup Piece 1 07-APR-07 C:\ORCL11\APP\ORACLE\FLASH_RECOVE RY_AREA\ORCL11\BACKUPSET\2007_04_07\O1_MF_NCSNF_TAG20070407T122609 _31HO1MRO_.BKP ... Archive Log 10 09-APR-07 C:\ORCL11\APP\ORACLE\FLASH_RECOVE RY_AREA\ORCL11\ARCHIVELOG\2007_04_09\O1_MF_1_116_31NO7Q44_.ARC Archive Log 11 09-APR-07 C:\ORCL11\APP\ORACLE\FLASH_RECOVE ... Backup Set 7 19-APR-07 Backup Piece 8 19-APR-07 C:\ORCL11\APP\ORACLE\PRODUCT\11.1 .0\DB_1\DATABASE\5TIFHU1H_1_1 Backup Set 7 19-APR-07 Backup Piece 9 19-APR-07 C:\ORCL11\APP\ORACLE\PRODUCT\11.1 .0\DB_1\DATABASE\5TIFHU1H_1_2 RMAN> The report obsolete command shows all backups sets, backup pieces, and datafile copies that RMAN considers obsolete since it doesn t need them to meet the specified backup retention policy. winforms ean 13 reader Best 20 NuGet ean-13 Packages - NuGet Must Haves Package
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