Classic asp - 64 bit MDAC reference problem

问题

I got an very basic test.asp page that needs to run on a 64-bit server

first i tried

<!--METADATA TYPE="TypeLib" NAME="Microsoft ActiveX Data Objects 2.5 Library" UUID="{00000205-0000-0010-8000-00AA006D2EA4}" VERSION="2.5"-->
<% 
.... more code 

does not work (even though i found the reference in COM) the i try

<!--METADATA TYPE="TypeLib" NAME="Microsoft ActiveX Data Objects 2.8 Library" UUID="{2A75196C-D9EB-4129-B803-931327F72D5C}" VERSION="2.8"-->
<% 
... more code 

this works ,, but why can't i reference the 2.5 version when the library exist on the server?

回答1:

Josip is nearly correct MDAC 2.5 is only 32 bit (2.8 has a 64 bit flavour). By default on 64 bit server your application pool will run using 64 bit processes. It will be looking in the 64 bit version of the system hive for the 2.5 type library reference but won't find it (its only in the 32 bit version).

If you edit your application pool settings so that it runs as 32 bit you should find the 2.5 reference will work.

回答2:

MDAC is available only on 32-bit.

You must change your application to target x86 (by default it targets AnyCPU). It will still run on x64 but with smaller memory space.

来源：https://stackoverflow.com/questions/1212292/classic-asp-64-bit-mdac-reference-problem