Choose between source paths for all files

I automatically run an obfuscator when I compile my project in visual studio. The obfuscated .dll files are saved with the same filename but in subfolders.

Folder structure

FileA_Secure (subfolder)
    FileA.dll
FileA.dll

Question: Can I make sure that Inno Setup compiles FileA.dll from the subfolder FileA_Secure and not the FileA.dll from the main folder if the "secured" FileA.dll exists?

Solution

You can use Inno Setup preprocessor to conditionally select a source. Particularly, use the #ifexist directive:

[Files]
#ifexist "MyClass_Secure\MyClass.dll"
Source: "MyClass_Secure\MyClass.dll"; DestDir: "{app}"
#else
Source: "MyClass.dll"; DestDir: "{app}"
#endif

Add SaveToFile to the end of your .iss, to see what is the final script like:

#expr SaveToFile(AddBackslash(SourcePath) + "Preprocessed.iss")

If you need to do this for many files, you can define a macro:

#define GetDllSource(Name) \
    FileExists(Name + "_Secure\" + Name + ".dll") ? \
        Name + "_Secure\" + Name + ".dll" : Name + ".dll"

[Files]
Source: {#GetDllSource("MyClass")}; DestDir: "{app}"
Source: {#GetDllSource("MyClass2")}; DestDir: "{app}"

If you want to do this for all files in a folder and its subfolders, it gets way more complicated:

#pragma parseroption -p-

; For given DLL, return path to secured DLL, if exists,
; otherwise return the DLL itself
#define GetDllSource(FileName) \
    Local[0] = ExtractFileName(FileName), \
    Local[1] = Pos(".", Local[0]), \
    Local[2] = Local[1] > 0 ? Copy(Local[0], 1, Local[1] - 1) : Local[0], \
    Local[3] = ExtractFilePath(FileName), \
    Local[4] = Local[3] + "\\" + Local[2] + "_Secure\\" + Local[0], \
    FileExists(Local[4]) ? Local[4] : FileName

; For DLLs, returns [Files] section entry, skip other files
#define FileEntry(Source) \
    (ExtractFileExt(Source) != "dll") ? \
        "" : "Source: " + GetDllSource(Source) + "; DestDir: {app}\n"

; If the directory entry is folder, call ProcessFolder.
; If it is a file, call FileEntry
#define ProcessFile(Source, FindResult, FindHandle) \
    FindResult \
        ? \
            Local[0] = FindGetFileName(FindHandle), \
            Local[1] = Source + "\\" + Local[0], \
            (Local[0] != "." && Local[0] != ".." \
                ? (DirExists(Local[1]) \
                    ? ProcessFolder(Local[1]) : FileEntry(Local[1])) \
                : "") + \
            ProcessFile(Source, FindNext(FindHandle), FindHandle) \
        : \
            ""

; If the folder is not _Secure, process its files and subfolders
#define ProcessFolder(Source) \
    (Pos("_Secure", ExtractFileName(Source)) > 0) ? \
        "" : \
        (Local[0] = FindFirst(Source + "\\*", faAnyFile), \
        ProcessFile(Source, Local[0], Local[0]))

#pragma parseroption -p+

[Files]
; Process this folder for DLLs and subfolders (can be changed for a real path)
#emit ProcessFolder(".")