OfficeControl and POI

Question

I bind OfficeControl's property dataSource with type com.sap.ide.webdynpro.uielementdefinitions.Resource, and can show excel in OfficeControl.
Then I use POI to create a excel and bind it with OfficeControl , but it has errors: ERRO|20080416133953|KHFA.OfficeCompView.OfficeControl_592|CIOS_GeneralDocumentContainer_Acf::|OleLoad|HRESULT=-2147221164(没有注册类别)
CODE:
ByteArrayOutputStream os = new ByteArrayOutputStream();
          HSSFWorkbook wb = new HSSFWorkbook();
          HSSFSheet s = wb.createSheet();
          wb.setSheetName(0, "Matrix");
          for(short i=0; i<50; i++) {
               HSSFRow row = s.createRow(i);
               for(short j=0; j<50; j++) {
                    HSSFCell cell = row.createCell(j);
                    cell.setCellValue(""i","+j);
          try {
               wb.write(os);     
          } catch (IOException e) {
               e.printStackTrace();
          try {
               IWDResource resource = WDResourceFactory.createCachedResource(os.toByteArray(),"name",WDWebResourceType.XLS);
               wdContext.currentContextElement().setResource(resource);
          } catch (Exception e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
Anyone can help me?
Thanks!

Answer 1

Hi, and thanks for the input.
Since by manually exporting an ALV list to XML format, i get the data in the desired XML format, I assume that there already are function modules or classes in the system to do the conversion for me; or is it a wrong assumption?
I'm looking at class CL_SALV_WD_EXPORT_UTIL, which exposes a method to convert ALV to XML format, but i can't seem to understand how to use it; and in a Webdynpro context I can't use anything which is GUI-dependent.
I thought that OfficeControl UI was for "Office Integration", that means there should be a well-defined set of common function, and that i was simply missing how to use them, not that i should learn how to use Microsoft internal XML representation of data.
So, the OfficeControl is intended to provide an IFrame-like embedding to an Office Document with no high-level support?