VBA (RFC) SAP export to excel - excel

Question

I am writing a VB application for connecting to a sap system (using rfc).
Everything works fine and I do get a connection and the data as well.
Nevertheless the code for saving the accessed data and writing it to a excel file is really slow.
After the connection I call RFC_READ_TABLE, which returns with a result in <5 secs, which is perfect. Writing to excel (cell by cell) is pretty slow.
Is there any way to 'export' the whole tblData to excel and not being dependent on writing cell by cell?
Thanks in advance!
If RFC_READ_TABLE.Call = True Then
MsgBox tblData.RowCount
If tblData.RowCount > 0 Then
' Write table header
For j = 1 To Size
Cells(1, j).Value = ColumnNames(j)
Next j
Size = UBound(ColumnNames, 1) - LBound(ColumnNames, 1) + 1
For i = 1 To tblData.RowCount
DoEvents
Textzeile = tblData(i, "WA")
For j = 1 To Size
Cells(i + 1, j).Value = LTrim(RTrim(getPieceOfTextzeile(Textzeile)))
Next j
Next
Else
MsgBox "No entries found in system " & SYSID, vbInformation
End If
Else
MsgBox "ERROR CALLING SAP REMOTE FUNCTION CALL"
End If

Answer 1

Arrays: Faster Than Ranges
If the data was ready (need not to be processed) something like this could be a solution:
Sub Sap()
Const cStrStart As String = "A1" 'First cell of the resulting data
Dim tbldata
Dim arrSap As Variant 'Will become a one-based two dimensional array
Dim oRng As Range
arrSap = tbldata 'Data is in the array.
'Calculate the range: Must be the same size as arrSap
Set oRng = Range(Cells(Range(cStrStart).Row, UBound(arrSap)), _
Cells(Range(cStrStart)).Column, UBound(arrSap, 2))
oRng = arrSap 'Paste array into range.
End Sub
Since you need to process your data from tbldata do what you do not to the range, but to an array which should be much faster:
Sub Sap()
Const cStrStart As String = "A1" 'First cell of the resulting data
Dim arrSap() As Variant
Dim oRng As Range
Dim Size As Integer
If RFC_READ_TABLE.Call = True Then
'-------------------------------------------------------------------------------
MsgBox tbldata.RowCount
If tbldata.RowCount > 0 Then
Size = UBound(ColumnNames, 1) - LBound(ColumnNames, 1) + 1
ReDim arrSap(1 To tbldata.RowCount + 1, 1 To Size) '+ 1 for header
' Write table header
For j = 1 To Size
arrSap(1, j).Value = ColumnNames(j)
Next j
' Write data
For i = 1 + 1 To tbldata.RowCount + 1 '+ 1 for header
DoEvents
'- 1 due to header, don't know what "WA" is
Textzeile = tbldata(i - 1, "WA")
For j = 1 To Size
arrSap(i, j) = _
LTrim(RTrim(getPieceOfTextzeile(Textzeile)))
Next j
Next
'-------------------------------------------------------------------------------
'Calculate the range: Must be the same size as arrSap
Set oRng = Range(Cells(Range(cStrStart).Row, Range(cStrStart).Column), _
Cells(UBound(arrSap) + Range(cStrStart).Row -1, _
UBound(arrSap, 2) + Range(cStrStart).Column -1))
oRng = arrSap
'-------------------------------------------------------------------------------
Else
MsgBox "No entries found in system " & SYSID, vbInformation
End If
Else
MsgBox "ERROR CALLING SAP REMOTE FUNCTION CALL"
End If
End Sub
Now adjust the cStrStart, check the rest of the code and you're good to go.
I haven't created a working example so I edited this code a few times. Check it carefully not to lose data.