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<concept xml:lang="en" id="GUID-8BFC185E-91FD-5E04-A26C-728B06F31FDD-GENID-1-7-1-23-1-1-4-1-3-1-6-1-6-1"><title>Creating Transfer Types</title><shortdesc>To transfer data between the Backup Engine and the backup server, a particular type of <apiname>conn::CSBGenericTransferType</apiname> must be created. </shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody><section><title>Introduction</title> <p>The <xref href="GUID-169BB4E2-5B0E-3719-A7B8-A3C0AAA602E2.dita#GUID-169BB4E2-5B0E-3719-A7B8-A3C0AAA602E2/GUID-FB671D02-0F15-396F-9FB7-EE3E9372093C"><apiname>conn::CSBEClient</apiname></xref> uses <xref href="GUID-169BB4E2-5B0E-3719-A7B8-A3C0AAA602E2.dita#GUID-169BB4E2-5B0E-3719-A7B8-A3C0AAA602E2/GUID-27BF6AEB-72A0-3E39-9598-AB97BE2569FC"><apiname>conn::CSBGenericTransferType</apiname></xref> to request (for backup) or supply (for restore) data. One of the following three derived classes must be created to transfer data. </p> <ul><li id="GUID-9002670C-20FB-5FCA-BB11-BAA96FC591A8"><p> <xref href="GUID-169BB4E2-5B0E-3719-A7B8-A3C0AAA602E2.dita#GUID-169BB4E2-5B0E-3719-A7B8-A3C0AAA602E2/GUID-6921D016-99BB-3CF0-B77C-CEF652A6D16B"><apiname>conn::CSBSIDTransferType</apiname></xref> transfers data of the owner whose type is <xref href="GUID-169BB4E2-5B0E-3719-A7B8-A3C0AAA602E2.dita#GUID-169BB4E2-5B0E-3719-A7B8-A3C0AAA602E2/GUID-A592A578-6E32-36C8-A2CE-590E99173AF8"><apiname>conn::ESIDDerivedType</apiname></xref>. Data owners of this type are the common applications or servers built into the ROM. </p> <p>You can specify the creation of passive data, active data or snapshot data transfer type by passing a <xref href="GUID-169BB4E2-5B0E-3719-A7B8-A3C0AAA602E2.dita#GUID-169BB4E2-5B0E-3719-A7B8-A3C0AAA602E2/GUID-55127967-CF91-3AEF-8304-DB60B287036F"><apiname>conn::TTransferDataType</apiname></xref> parameter value to the <codeph>CSBSIDTransferType::NewL()</codeph> function. For example, passing <codeph>EActiveSnapshotData</codeph> to <codeph>CSBSIDTransferType:NewL()</codeph> creates an active snapshot transfer type. </p> </li> <li id="GUID-550A62AA-0E27-5DD0-B014-3498CFDEDDEA"><p> <xref href="GUID-169BB4E2-5B0E-3719-A7B8-A3C0AAA602E2.dita#GUID-169BB4E2-5B0E-3719-A7B8-A3C0AAA602E2/GUID-EB313AA2-302E-352F-B1A4-E60DAFBEBCFB"><apiname>conn::CSBPackageTransferType</apiname></xref> transfers data of the owner whose type is <xref href="GUID-169BB4E2-5B0E-3719-A7B8-A3C0AAA602E2.dita#GUID-169BB4E2-5B0E-3719-A7B8-A3C0AAA602E2/GUID-A68EF3B1-2DF6-3787-83E0-F72CE16E785D"><apiname>conn::EPackageDerivedType</apiname></xref>. Data owners of this type are usually installed through SIS files. Installing a package may install may install several applications (data owners). Each package is identified by a package ID while each data owner is identified by a package ID, a package name and an SID. </p> <p>Packages are often installed to a system drive, their data and snapshots are referred to as system data and system data snapshots. </p> </li> <li id="GUID-03178C8B-DFD8-5094-BFA6-65DB923E77BC"><p> <xref href="GUID-169BB4E2-5B0E-3719-A7B8-A3C0AAA602E2.dita#GUID-169BB4E2-5B0E-3719-A7B8-A3C0AAA602E2/GUID-A655F770-18F9-3F43-ADAB-9048EF14A5EC"><apiname>conn::CSBJavaId</apiname></xref> transfers data of the owner whose type is <xref href="GUID-169BB4E2-5B0E-3719-A7B8-A3C0AAA602E2.dita#GUID-169BB4E2-5B0E-3719-A7B8-A3C0AAA602E2/GUID-BCB77CBF-1B06-38E1-96C1-FF3CFCA5B734"><apiname>conn::EJavaDerivedType</apiname></xref>. Data owners of this type are Java applications. </p> </li> </ul> </section> <section id="GUID-8BFC185E-91FD-5E04-A26C-728B06F31FDD-GENID-1-7-1-23-1-1-4-1-3-1-6-1-6-1-3-2"><title>Procedure</title> <p>Create an array of a particular type, for example passive data for all data owners. Then go through the array to create the transfer types. </p> <p>The following example shows how to create the <xref href="GUID-169BB4E2-5B0E-3719-A7B8-A3C0AAA602E2.dita#GUID-169BB4E2-5B0E-3719-A7B8-A3C0AAA602E2/GUID-EB313AA2-302E-352F-B1A4-E60DAFBEBCFB"><apiname>conn::CSBPackageTransferType</apiname></xref>. You can further specify to create the data or snapshots. </p> <codeblock id="GUID-1D28813F-25CA-5169-8FC9-88FDA081DDD5" xml:space="preserve">/**
Each data owner in iDataOwners is a CDataOwnerInfo object, the following creates 
CSBGenericTransferTypes based on the TPackageDataType passed. 
@param aTransferTypes - Array of package transfer types.
@param aPkgDataType - system data or system data snapshot.
*/

void::GeneratePIDTransferTypesL(
           RPointerArray&lt;CSBGenericTransferType&gt;&amp; aTransferTypes,
           TPackageDataType aPkgDataType)
{

    aTransferTypes.ResetAndDestroy();
    TUid id;

    //need array to avoid duplications
    RArray&lt;TUid&gt; uidArray;
    CleanupClosePushL(uidArray);

    //One transfer type is created for each drive 
    //on which the data owner has data.
    TInt length = iDriveList.Length();
    for (TInt driveCount = 0; driveCount &lt; length; driveCount++)
       {
       if (iDriveList[driveCount])
              {
              TInt count = iDataOwners.Count();
              for (TInt i = 0; i &lt; count; i++)
                    {
                    switch (iDataOwners[i]-&gt;Identifier().DerivedTypeL())
                       {
                        case EPackageDerivedType:
                         if (iDataOwners[i]-&gt;CommonSettings() &amp; EHasSystemFiles)
                               {
                               //Create CSBPackageId for each data owner in the package
                               CSBPackageId* pkgId = 
                                  CSBPackageId::NewL(&amp;(iDataOwners[i]-&gt;Identifier()));
                               CleanupStack::PushL(pkgId);
                                          
                               id = pkgId-&gt;PackageIdL();
                               if (uidArray.Find(id) == KErrNotFound)
                                  {
                                  
                                  //Create the package transfer type based on the 
                                  //aPkgDataType parameter value passed in, 
                                  //system data or snapshot.
                                  CSBPackageTransferType* idType = 
                                      CSBPackageTransferType::NewL(
                                                                   id,
                                                                   TDriveNumber(driveCount), 
                                                                   aPkgDataType  
                                                                  );
                                  CleanupStack::PushL(idType);
                                  aTransferTypes.AppendL(idType);
                                  CleanupStack::Pop(idType);

                                  //add to uid array
                                  uidArray.AppendL(id);
                                  }
                               CleanupStack::PopAndDestroy(pkgId);      
                               } //if
                        break;
                       } // switch
                    } //for              
                } //if 
          } //for

CleanupStack::PopAndDestroy(&amp;uidArray);
}
</codeblock> </section> </conbody><related-links><link href="GUID-0BD22FDB-1A5C-56AA-A7FC-BD2271B2F928.dita"><linktext>Writing a Backup Engine Client
                (CSBEClient)</linktext> </link> </related-links></concept>