Hello All,

How do you check and trap for the instantiation of a COM component when you are unsure of whether or not a user will have the component library installed?

In VFP I can do:

TRY
    *-- Create zipper object
    loZipper = CREATEOBJECT( "XceedSoftware.XceedZip.4" )
CATCH

ENDTRY
IF TYPE("loZipper") <> "O"
    * Could not create zip object, probably don't have the Xceed components installed
    MESSAGEBOX("Please check to make sure you have the Xceed Zip Compression Library installed", ;
        0 + 16,"Error: Missing Required Files")
    RETURN .F.
ENDIF

However, if I try to do the following in C#:

try
{
    XceedZipLib.XceedZipClass loZipper = new XceedZipLib.XceedZipClass();
}
catch
{
    MessageBox.Show("Please check to make sure you have the Xceed Zip Compression Library installed",
		"Error: Missing Required Files", MessageBoxButtons.OK, MessageBoxIcon.Stop);

    return false;
}

loZipper.PreservePaths = false;
loZipper.FilesToProcess = ...

I get an error saying that "The type or namespace name 'type/namespace' could not be found (are you missing a using directive or an assembly reference?)" when I try to do anything with the loZipper object. If remove the try-catch, everything is fine. Why does the scope change in the try-catch?

So... How should I be testing for loZipper creation?


Thanks,

- Brian