Inno Setup: read source path from a registry on compile time

问题

Reading a registry value from the [Code] section is quite easy. But if I have to read the value of a registry (an installation path) to be used in the [Files] section in order to copy files from a source folder the the install/destination folder

I tried:

Source: "{reg:HKLM\SOFTWARE\MyApp,InstallDir|DefaultDirName}\*"; DestDir: "{app}\Mydestination"; AfterInstall: AfterInstallProc

receiving the error

"unknown filename prefix 'reg:'".

Or is there a possibility to read a registry value at the beginning and storing it (a constant? and variable?) in order to be used in the [Files] section?

回答1:

As documentation says, you can use constants only when you use an external flag:

Constants may only be used when the external flag is specified, because the compiler does not do any constant translating itself.

It's because the constants are resolved on run-time, while the (non-external) files are compiled into the installer on compile time.

If you want to read the registry on the target machine, you actually want to use the external flag anyway.

---

If you want to read local registry, use pre-processor function ReadReg:

Source: "{#ReadReg(HKLM, "SOFTWARE\MyApp", "InstallDir", "DefaultDirName")}\*"; \
    DestDir: "{app}\Mydestination"; AfterInstall: AfterInstallProc

---

Though I'd personally prefer a value set on the command-line of the compiler:

Source: "{#InstallDir}\*"; DestDir: "{app}\Mydestination"; \
    AfterInstall: AfterInstallProc

Set as:

ISCC.exe Example1.iss /DInstallDir=c:\path

来源：https://stackoverflow.com/questions/33348414/inno-setup-read-source-path-from-a-registry-on-compile-time