diff -r 43e37759235e -r 51a74ef9ed63 Symbian3/SDK/Source/GUID-685CF352-372F-5393-97AF-1FA17DC57BA8.dita --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/Symbian3/SDK/Source/GUID-685CF352-372F-5393-97AF-1FA17DC57BA8.dita Wed Mar 31 11:11:55 2010 +0100 @@ -0,0 +1,49 @@ + + + + + +Constructing Descriptor ArraysDescriptor arrays provide normal array operations for inserting, appending, deleting, and accessing elements.
Procedure

Follow the steps listed below to construct descriptor arrays:

  1. Construct a set of descriptors.

    The following code fragments illustrate how to construct a CDesCArrayFlat and a CPtrCArray. Both array types can accept any type of descriptor as source when adding a new array element.

    _LIT( KText1,"abcdefg" ); +_LIT( KText2,"hijk" ); +_LIT( KText3,"lmnopqr" ); +_LIT( KText4,"stuvwxyz" ); +... +TBufC<8> buffer1( KText1 ); // a non-modifiable buffer descriptor +TBuf<8> buffer2( Ktext2 ); // a modifiable buffer descriptor +... +TPtrC ptr1( Ktext3 ); // a non-modifiable pointer descriptor +TPtr ptr2; // a modifiable pointer descriptor +ptr2 = buffer1.Des(); // pointing to the data in buffer1 +... +HBufC* heapbuff = HBufC::NewL( 8 ); // a heap descriptor +*heapbuff = KText4;

    Note: Constructing and using a CDesCArraySeg is same as using CDesCArrayFlat.

  2. Add the five descriptors to CDesCArrayFlat as shown in the following code.

    CDesCArrayFlat* descarray; +... +descarray = new( ELeave ) CDesCArrayFlat( 5 ); +... +descarray->AppendL( buffer1 ); +descarray->AppendL( buffer2 ); +descarray->AppendL( ptr1 ); +descarray->AppendL( ptr2 ); +descarray->AppendL( *heapbuff ); +... +TInt len = descarray->MdcaPoint( 2 ).Length(); // information about + // the third element +...

  3. Add the five descriptors to CPtrCArray as shown in the following code.

    CPtrCArray* ptrcarray; +... +ptrcarray = new( ELeave ) CPtrCArray( 5 ); +... +ptrcarray->AppendL( buffer1 ); +ptrcarray->AppendL( buffer2 ); +ptrcarray->AppendL( ptr1 ); +ptrcarray->AppendL( ptr2 ); +ptrcarray->AppendL( *heapbuff ); +... +TInt len = ptrcarray->MdcaPoint( 2 ).Length(); // information about + // the third element +...
Descriptor Arrays \ No newline at end of file