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ASP FAQ Tutorials :: Classic ASP 1.0 :: COM / ActiveX Components :: How do I determine if a COM object is installed?


How do I determine if a COM object is installed?

As long as you know the ProgID (e.g. "Scripting.FileSystemObject"), you can easily determine if a COM object is installed and available for you to use. In the following example, I am going to send an e-mail *if* ASPMail ("SMTPsvg.Mailer") is installed and registered: 
 
<% 
    On error resume next 
    Set Mailer = CreateObject("SMTPsvg.Mailer") 
    if err.number <> 0 then 
        Response.Write "ASPMail is not installed." 
    else 
        Mailer.RemoteHost = "<some remote SMTP host that allows relay>" 
        Mailer.FromName = "Me!" 
        Mailer.FromAddress = "me@me.com" 
        Mailer.Subject = "Test" 
        Mailer.BodyText = "Hello" 
        Mailer.Addrecipient "you@me.com","you@me.com" 
        if not Mailer.sendMail then Response.Write mailer.response 
        set Mailer=nothing 
    end if 
%> 
 
If you're not making code decisions based on the results of the check, you can just print out a result. For example, I have a status ASP page I check on all servers we add to our web farm, to make sure that each necessary COM object is installed, registered, licensed where applicable, and works as coded. Here is the type of code I use: 
 
<% 
    On error resume next 
    if isObject(Createobject("SMTPsvg.Mailer")) then 
        response.write "ASPMail is installed." 
    else 
        response.write "ASPMail is not installed." 
    end if 
%> 
 
Of course, knowing the object is there is only half the battle sometimes; CDONTS is particularly gnarly to get working properly, and FileSystemObject can be extremely permissions-sensitive.

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Created: 5/8/2001 | Last Updated: 3/24/2005 | broken links | helpful | not helpful | statistics
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