Not able to open Excel File in TestComplete

I am using the hashtable to pass excel files path . In hashtable we use '\\' in the path and it has worked fine in my previous web project. But now when I am using it on iOS project, this code is not working.When TestComplete try to open this file, I get error below error:

JavaScript runtime error.
'' could not be found. Check the spelling of the file name, and verify that the file location is correct.
If you are trying to open the file from your list of most recently used files, make sure that the file has not been renamed, moved, or deleted. 

File file very much exist , I am able to open the file using same path from cmd propmt.One thing I have noticed that when I evaluate 'ExcelPath' using cntrl F12..it is being taken litteral as mentioned in hastable i.e. ("D:\\A360_AutoQA\\TestData\\Book1.xlsx") but If I provide single '\' in path then path is being taken as  ("D:A360_AutoQATestDataBook1.xlsx").This is confusing me.

below is the code for the same:

 Hastable:

var Excel_Path = 

{

//Test

TestSheet : "D:\\A360_AutoQA\\TestData\\Book1.xlsx"

} 

 This is my Test Unit:

function Test() 

{ 　

//Datasheet Path  

ExcelPath = Excel_Path.TestSheet; 

//To get the valid Row count in Excel sheet

var RowCnt = get_valid_row_count ();

Log.Message(RowCnt)

}

 

This is my excel lib:

var objExcel = Sys.OleObject("Excel.Application");

var astrSheetName = "Sheet1";

var ExcelPath;　 

function get_valid_row_count ()

{

var aobjWorkbook = objExcel.Workbooks.Open(ExcelPath);

var objExcelSheet = aobjWorkbook.Sheets(astrSheetName).Activate;

var iUsedRowCount = aobjWorkbook.ActiveSheet.UsedRange.Rows.Count; 

var ValidRowCnt = (iUsedRowCount-1); 

return ValidRowCnt;

} 

can anyone suggest what should I do to resolve it.

Thanks in advance!!

 

*************************************

To be sure that error is not because of the way path is defined , I have removed hastable and just used two function mentione below still the file could not be opened.same error is occuring and I can still can open the file by pasting same file path in Run command.

 

Test Unit-------

function Test() 

{ 　

//Datasheet Path

ExcelPath = "D:\A360_AutoQA\TestData\Book1.xlsx"; 

Open_Excel(ExcelPath);

}

 

Excel Library code-------------

var ExcelPath;

function Open_Excel(){

var objExcel = new getActiveXObject("Excel.Application");

objExcel.Visible = true;

var objWorkbook = objExcel.Workbooks.Open(ExcelPath); ------(Getting error on this line)

 

}

 

Please guide me what am I doing wrong.