How can I test a built file path within Excel VBA? - excel

Question

Column A contains part numbers such as 499305 and 488212
Sub ProductLoopChemSafe()
Dim X As Integer
Dim lRow As Long
Image1 = 250
Image2 = 500
Image3 = 5000
lRow = Cells(Rows.Count, 1).End(xlUp).Row
For X = 3 To lRow
Range("B" & X).Value = "http://www.chemsafeint.com/images/products/" & Image1 & "/" & Range("A" & X).Value & ".gif"
Range("C" & X).Value = "http://www.chemsafeint.com/images/products/" & Image2 & "/" & Range("A" & X).Value & ".gif"
Range("D" & X).Value = "http://www.chemsafeint.com/images/products/" & Image3 & "/" & Range("A" & X).Value & ".gif"
Range("E" & X).Value = "http://www.chemsafeint.com/files/sds/" & Range("A" & X).Value & ".pdf"
Range("F" & X).Value = "http://www.chemsafeint.com/files/pds/" & Range("A" & X).Value & ".pdf"
Range("G" & X).Value = "http://www.chemsafeint.com/files/idf/" & Range("A" & X).Value & ".pdf"
If Range("A" & X) = "17255" Then
Range("H" & X).Value = "http://www.chemsafeint.com/files/eds/" & Range("A" & X).Value & ".pdf"
End If
If Range("A" & X) = "17418" Then
Range("I" & X).Value = "http://www.chemsafeint.com/files/epp/" & Range("A" & X).Value & ".pdf"
End If
If Range("A" & X) = "17750" Then
Range("I" & X).Value = "http://www.chemsafeint.com/files/epp/" & Range("A" & X).Value & ".pdf"
End If
If Range("A" & X) = "17822" Then
Range("I" & X).Value = "http://www.chemsafeint.com/files/epp/" & Range("A" & X).Value & ".pdf"
End If
Next X
End Sub
How can I test to see if a path is valid before I write it?
I'd like to do something like:
DIM Bvalue as string
Bvalue = "http://www.chemsafeint.com/images/products/" & Image1 & "/" & Range("A" & X).Value & ".gif"
If Bvalue is valid then
Range("B" & X).value = Bvalue
Else
Range("B" & X).value = ""
END IF

Answer 1

You can write a function that receive the URL as parameter and validate it with some web-scraping code then returns true or false if the object of the link is valid. something like isObject( html_element )
The HTML element could be an element that loads everytime when the stuff that you are searching exists. For example the following URL https://chemsafeint.com/images/products/500/11999-DM55.gif has the object img inside the HTML code ( if you are not familiar please search Web Scraping with VBA ), then you can try this:
Function isValid ( byVal URL as string )as boolean
'URL is the link that you have just mounted concatenating strings.
Dim IE As InternetExplorer: Set IE = New InternetExplorer
IE.navigate URL
IE.AddressBar = False
IE.Visible = True
Set IEDOC = IE.document
Dim ELE as HTMLImage
Set ELE = IEDOC.getElementsByTagName("img")
if isObject(ELE) then
isValid = true
else
isValid = false
end if
IE.Quit
Set IE = NOTHING
Exit Function