public static IntPtr FPDFDOC_InitFormFillEnvironment(IntPtr document, ref FPDF_FORMFILLINFO formInfo)
 {
     lock (LockString)
     {
         return Imports.FPDFDOC_InitFormFillEnvironment(document, ref formInfo);
     }
 }
 public static extern IntPtr FPDFDOC_InitFormFillEnvironment(IntPtr document, ref FPDF_FORMFILLINFO formInfo);
 public static extern IntPtr FPDFDOC_InitFormFillEnvironment(IntPtr document, FPDF_FORMFILLINFO formInfo);