Int32 parse not finding object in asp - asp-classic

Question

I have the follow asp file:
<H3>test file</H3>
<%
s = "1"
a = Int32.Parse(s)
%>
and I get the following error:
test file
Microsoft VBScript runtime error '800a01a8'
Object required: ''
/ignore/testInt32.asp, line 4
I suspect I am missing an include, but I can not find any example that has an include.

Answer 1

Are you sure you are using classic asp. I looked this up because I though
Int32.Parse()
was a bit strange. As far as I can tell that is a ASP.NET only function. for classic asp you should use
CInt()
Edit: Just wanted to update my answer a bit. While the above line would give you no issue in your example, in order to make sure the code exactly matches what your original code would do, you should instead use
CLng()
CLng will overflow after ~2 million the same as Int32. CInt on the other hand CInt will overflow after ~30k. Either way for classic asp you should use one of those two.

Answer 2

Why did you get an Object Required Error?
The issue is your mixing asp.net objects with asp-classic which out of the box Classic ASP (by default vbscript) doesn't know about.
The fact a line number is included should lead to the cause of the problem fairly quickly.
Microsoft VBScript runtime error '800a01a8'
Object required: ''
/ignore/testInt32.asp, line 4
on line 4 which will be;
a = Int32.Parse(s)
An Object is required error occurs because Int32 is not a valid "Object Reference" as far as VBScript is concerned. There is no built-in Objects called Int32 and there is no instantiation of an Int32 Object Reference using code like;
Set Int32 = Server.CreateObject("TheObjectsProgID")
Solution
If you want to parse an Long data type in VBScript as #KHeaney has suggested you should be using
a = CLng(s)
VBScript is Typeless so Check Your Variables
Be aware that if the value of s is not a valid numeric value you conversion will fail and you will receive a
Microsoft VBScript runtime error '0x800a000d'
Type mismatch: 'CLng'
There are various ways to get around this including using Val() which will return non numeric conversions as 0 (this can be dangerous). Another approach is to check the value beforehand using something like;
If IsNumeric(s) Then a = CLng(s) Else a = 0
You don't have to set a = 0 this can be any assignment a = "" is also possible, the fact is checking the variable like this gives you greater control over the outcome.
Useful Links
CLng() Function
VBScript Data Types