问题
According to URLs I referenced, I understand that the Windows Installer uses key files to compare the version, date, and language of components and determine whether to update the component on target machine.
http://msdn.microsoft.com/en-us/library/windows/desktop/aa368599%28v=vs.85%29.aspx http://msdn.microsoft.com/en-us/library/windows/desktop/aa371221%28v=vs.85%29.aspx
I also understand that default versining rules consist of 4 different cases as listed below.
- Both Files Have a Version
- Neither File Has a Version
- Neither File Has a Version with File Hash Check
- One File Has a Version
What I don't understand is that how does the installer determine whether the component needs to be updated if neither components has a key file?
And what's going to happen if neither components has a key file, but a file on the target computer indicates that its Modified date is later than the Create date? In this case, even when both products have a version, are they going to be considered as having Non-versioned files because no key file is set to components? How does the installer determine whether to install?
Any answers would be really appreciated,
回答1:
Every component from the installer must have a key member, this is imposed by Windows Installer to build a valid MSI package. Also, Microsoft strongly recommends that you create independent components for each DLL, EXE, OCX and hlp/help file. This will allow the file versioning rules to be correctly applied.
来源：https://stackoverflow.com/questions/18854897/file-versioning-rules-when-neither-components-has-a-key-file