Install only if external file exists

问题

I would like to instruct Inno Setup to install a certain external file only if does exist.

Like so:

Source: "d:\sources\SomeDLL.dll"; DestDir: {app}; \
    Flags: external regserver uninsneveruninstall ignoreversion

However, I did not find a flag that would instruct Inno Setup to skip this line / file if d:\sources\SomeDLL.dll does not exist.

Is this possible?

Thank you!

回答1:

Use the skipifsourcedoesntexist flag:

This flag instructs the compiler -- or Setup, if the external flag is also used -- to silently skip over the entry if the source file does not exist, instead of displaying an error message.

回答2:

Try this flag:

onlyifdestfileexists

Only install the file if a file of the same name already exists on the user's system. This flag may be useful if your installation is a patch to an existing installation, and you don't want files to be installed that the user didn't already have.

http://www.jrsoftware.org/ishelp/index.php?topic=filessection

来源：https://stackoverflow.com/questions/37163013/install-only-if-external-file-exists