Sample class that demonstrates how to load Jacob.dll from inside a jar file

samples/com/jacob/samples/JavaWebStart/DLLFromJARClassLoader.java

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+package com.jacob.samples.JavaWebStart;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.InputStream;
+
+/**
+ * It is sometimes necessary to run Jacob without being able to install the dll
+ * on the client machine.  This is true in JavaWebStart (JWS) and possibly 
+ * Applet environments.  The obvious thing to do here is to jar up 
+ * the Jacob.dll so that it can be downloaded the client along with the rest
+ * of the resources.  This is simple except that the System.Load() function
+ * does not search jar files for DLLs.  It searches the classpath.
+ * The work around to this problem is to write the DLL to a temporary file and then
+ * explicitly load the DLL calling passing the full path to the temporary file.
+ * 
+ * The following code demonstrates this idea.
+ * 
+ * @author joe
+ *
+ */
+public class DLLFromJARClassLoader {
+
+    /**
+     * Load the DLL from the classpath rather than from the java path.
+     * This code uses this class's class loader to find the dell in one
+     * of the jar files in this class's class path.  It then
+     * writes the file as a temp file and calls Load() on the temp file.
+     * The temporary file is marked to be deleted on exit so the dll
+     * is deleted from the system when the application exits.
+     * <p>
+     * Derived from ample code found in Sun's java forums
+     * <p.
+     * @return true if the native library has loaded, false if there was a problem.
+     */
+    public boolean loadLibrary()
+    {
+        try
+        {
+          //Finds a stream to the dll. Change path/class if necessary
+          InputStream inputStream = getClass().getResource("/jacob.dll").openStream();
+          //Change name if necessary
+          File temporaryDll = File.createTempFile("jacob", ".dll");
+          FileOutputStream outputStream = new FileOutputStream(temporaryDll);
+          byte[] array = new byte[8192];
+          for (int i = inputStream.read(array);
+               i != -1;
+               i = inputStream.read(array)) {
+            outputStream.write(array, 0, i);
+          }
+          outputStream.close();
+          temporaryDll.deleteOnExit();
+          System.load(temporaryDll.getPath());
+          return true;
+        }
+        catch(Throwable e)
+        {
+            e.printStackTrace();
+            return false;
+        }
+    }
+    
+	
+}