Dependency checking

Installer/Dexif_Installer/Helper.cs

@@ -0,0 +1,29 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Dexif_Installer {
+  class Helper {
+    // https://stackoverflow.com/a/3856090/4708786
+    public static bool ExistsOnPath(string fileName) {
+      return GetFullPath(fileName) != null;
+    }
+
+    public static string GetFullPath(string fileName) {
+      if (File.Exists(fileName)) { 
+        return Path.GetFullPath(fileName);
+      }
+      var values = Environment.GetEnvironmentVariable("PATH");
+      foreach (var path in values.Split(Path.PathSeparator)) {
+        var fullPath = Path.Combine(path, fileName);
+        if (File.Exists(fullPath)) {
+          return fullPath;
+        }
+      }
+      return null;
+    }
+  }
+}