How can I get system display name with Inno Setup?

How can I get system display name of a file, directory, or folder as it would be displayed in a system file browser? For example original CD is 开发者_Go百科named somehow and I want to do little copy protection

Inno Setup provides no such functions. However, you can easily write your own DLL that investigates the label of the CD drive of the setup program. In Pascal, just do

function GetCDLabel: string;
var
  VolumeName: PChar;
  dummy: cardinal;
begin
  GetMem(VolumeName, MAX_PATH * sizeof(char));
  try
    if GetVolumeInformation(PChar('D:\'), VolumeName, MAX_PATH + 1, nil, dummy, dummy, nil, 0) then
      result := VolumeName
    else
      RaiseLastOSError; // or result := 'Invalid';
  finally
    FreeMem(VolumeName);
  end;
end;

Inno Setup lets you include DLLs with your setup, and call functions in these DLLs during setup. Of course, your setup must tell the DLL function its filename, so that the DLL function can use the right drive. You cannot just assume it is D:\.