问题
I need to get the path that the user chose to install my application into.
If I set CreateAppDir=yes and set a DefaultDirName=C:\MyApp\ the user can change it to some other directory. After they do this, I need to know which directory they chose on the next install wizard step. How can I get this value?
回答1:
Use the {app} constant. The reference describes it as:
The application directory, which the user selects on the Select Destination Location page of the wizard. For example: If you used {app}\MYPROG.EXE on an entry and the user selected "C:\MYPROG" as the application directory, Setup will translate it to "C:\MYPROG\MYPROG.EXE".
Optionally you can use the WizardDirValue function. This one is described as:
Returns the current contents of the edit control on the Select Destination Location page of the wizard.
Unlike ExpandConstant('{app}'), this function will not fail if called after the wizard is shown but prior to the user selecting a directory. Rather, it will return the default directory name.
来源：https://stackoverflow.com/questions/28349106/how-do-you-find-the-user-selected-install-path-in-inno-setup