The pre/requisite to use Excel API class is are:
1) Should be run in a windows env. Hence the batch server should be windows, in Unix these commands will not work
2) MS Excel should be installed in the windows machine. If not, then calling createobject for Excel application will throw exceptions since there is no underlying excel libraries to handle the call.

To test your AE works or not, you can try running AE in 2 tier i.e directly from Application designer assuming your work env machine is windows with excel installed. The code should work properly there.

 &oWorkApp = CreateObject("COM", "Excel.Application"); 

Is not working, which PeopleTools version are you running?

First operand of . is NULL, so cannot access member DispalyAlerts. (180,236) DS_PC_APP.MAIN.GBL.default.1900-01-01.Step02.OnExecute PCPC:188 Statement:2
Message Set Number: 180
Message Number: 236
Message Reason: First operand of . is NULL, so cannot access member %1. (180,236)

Process 1549 ABENDED at Step DS_PC_APP.MAIN.Step02 (PeopleCode) — RC = 8 (108,524)
Message Set Number: 108
Message Number: 524
Message Reason: Process 1549 ABENDED at Step DS_PC_APP.MAIN.Step02 (PeopleCode) — RC = 8 (108,524)

Process %s ABENDED at Step %s.%s.%s (Action %s) — RC = %s

try
&oWorkApp = CreateObject("COM", "Excel.Application");
&oWorkApp.DisplayAlerts = "False";
&oWorkBook = ObjectGetProperty(&oWorkApp, "Workbooks");
&oWorkBook.Open("C:\temp\template.xls");
&oWorkSheet = &oWorkApp.Worksheets("Sheet1");
&oWorkApp.ActiveWorkBook.SaveAs("C:\temp\your_output_file.xls");
/* then go crazy with your worksheet object */
/* eg */
&oWorkSheet.Cells(1, 1).Value = "I'm adding stuff to be bolded";
&oWorkSheet.Cells(1, 1).Font.Bold = True;
/* Save Excel file and quit */
&oWorkApp.ActiveWorkBook.Save();
&oWorkApp.ActiveWorkBook.Close();
&oWorkApp.DisplayAlerts = "True";
&oWorkApp.Quit();
catch Exception &c1
MessageBox(0, "", 0, 0, "Caught exception: " | &c1.ToString());
end-try;

ERROR RECEIVED -
Caught exception: First operand of . is NULL, so cannot access member DisplayAlerts. (180,236)

I need to create more than one sheet on excel, anyone can help me?

I want to use this piece of code on my page on the hyperlink.

Local object &oWorkApp, &oWorkBook;
&oWorkApp = CreateObject("COM", "Excel.Application");
&oWorkApp.DisplayAlerts = "False";
&oWorkBook = ObjectGetProperty(&oWorkApp, "Workbooks");
&oWorkBook.Open("C:\some_path_to\template.xls");
&oWorkSheet = &oWorkApp.Worksheets("Sheet1");
&oWorkApp.ActiveWorkBook.SaveAs("C:\your_output_file.xls");

But when I click on the link it gives me the error 'Class COM not found. The given class is not found in the database or having problems to access it.'

Please help.

Are you still having the same error "Invalid parameter: CreateObject Excel.Application invalid class string for function ObjectGetProperty." ? What have you done to correct this error?
I am actually facing the same error when using the following code in my AE peoplecode:
Local object &oWorkApp,&oWorkBook;
&oWorkApp = CreateObject("COM", "Excel.Application");
&oWorkBook = ObjectGetProperty(&oWorkApp, "Workbooks");

Thank you for your help.

&oWorkApp = CreateObject("COM", "Excel.Application");
ObjectSetProperty(&oWorkApp, "Visible", True);
&oWorkBook = ObjectGetProperty(&oWorkApp, "Workbooks");
&oWorkBook.Open("C:\temp\rates99.xls");

Local File &DATFILE;
Local string &FILE_NAME, &DATA;

&FILE_NAME = "C:\temp\rates.dat";
&DATFILE = GetFile(&FILE_NAME, "r");
&FileName = &DATFILE.Name;
&POS = Find(".", &FileName);
&NEWFILE_NAME = Substring(&FileName, 1, &POS) | "dat";
&DATFILE = GetFile(&NEWFILE_NAME, "N", %FilePath_Absolute);
If &DATFILE.IsOpen Then
While &DATFILE.ReadLine(&DATA);
&DATFILE.WriteLine(&DATA);
End-While;
&DATFILE.Close();
End-If;

Local object &oWorkApp, &oWorkSheet, &oWorkBook, &oRange, &oCells;

Valkyrie

Heres our code compare side by side
&WorkApp = CreateObject ("COM", "Excel.Application"); your code
&oWorkApp = CreateObject("COM", "Excel.Application"); my code

&oWorkBook = ObjectGetProperty(&oWorkApp, "Workbooks"); my coode
&WorkBook = ObjectGetProperty(&WorkApp, "Workbooks"); your code

I hope it helps..

Valkyrie

I have instantiated Excel Object in AE Peoplecode and have been successfully manipulating data cells in each worksheet tab of my workbook.
Now I want to copy a range of cells from one worksheet to another and paste its values on the other worksheet, though I dont encounter error but the
action does not execute. Also when I try to save the excel file it takes forever to save. Heres some part of my code
Appreciate your input.

get a cell range then;

&RangeSelected = &oCells.Copy;
&oWorkSheet1 = &oWorkApp.Worksheets("Sheet2");
&oCell = ObjectGetProperty(&oWorkSheet1, "Range", "A1");
&SheetSelected = &oWorkSheet1.Activate;
&oCell = ObjectGetProperty(&oCell, "PasteSpecial");

ObjectDoMethod(&WORKAPP, "Save", "C:\TEMP\TEST1.XLS");

Thanks a lot

Valkyrie

 Local object &WorkApp; 

And remove, &WorkBook, does that make any difference?

Local object &WorkApp, &WorkBook;

&WorkApp = CreateObject ("COM", "Excel.Application");
&WorkBook = ObjectGetProperty(&WorkApp, "Workbooks");

etc
The message returned for the ObjectGetProperty statement says "Invalid parameter: CreateObject Excel.Application invalid class string for function ObjectGetProperty. The specified parameter is not correct for the function. It may be the wrong type of parameter (string, number, record, field etc) or an invalid value in this context.

Can anyone help?