为什么我不能从64位Windows 7的mdb文件中检索数据？

Question

I recently bought a software that uses an mdb file for data storage. I don't like the software's reporting and statement generation that much so I decided to write my own reporting program using VS 2008's C#.

So my program accesses the mdb file that comes with the software I just bought. My dev environment is Windows XP. My deployment environment is Windows 7 64-bit. In my dev machine, I can retrieve records from the mdb file just fine but when I deploy the program to a Windows 7 64-bit machine, it cannot read the records from the mdb file. No errors are thrown, it just can't get that data.

I also tried installing VS 2012 on the deployment machine (Win 7 64-bit) and imported my VS2008 project there. Same issues, can't get records from that mdb file (again, no errors are thrown).

Please help?

edit 1: I just tried backing up the mdb using the purchased software backup utility. I can retrieve records from that backed up mdb. I wonder if the software is trying to modify my access to the mdb file.

edit 2: I don't think the software is trying to modify my access to the mdb file because when deployed to my xp machine, I can access the mdb file just fine.

edit 3: I'm beginning to suspect this is a file security feature within Windows 7.

edit 4: If I copy the mdb file and access that copied mdb file, it returns 0 rows. If I back it up using the software's backup utility, it returns the exact rows I expect.

Answer 1

The problem is that you're running up against security features of Windows.

Programs are no longer allowed to change files under the program files directories, unless they run with elevated access.

What happens is that a feature called Virtual Store kicks in and creates private (for your user) copies of the file somewhere else, under your user profile.

Most likely the software has created an empty database file under the user profile, and is accessing that instead.

You can not place writable files in the program files any more, the program needs to be either redesigned or installed somewhere else, like under the user profile where it would have write access.

Answer 2

将目标平台设置为“ x86”，而不是“ Any cpu”，以确保您运行的是32位。