public class HelloWindows {
 
   /** @dll.import("winmm") */
   static native boolean sndPlaySound(String lpszSound, int fuSound);
 
   public static void main (String args[]) {
     boolean returnCode;
     int     flags     = 0;
     String  soundFile = System.getProperty("com.ms.windir") + "\\MEDIA\\The  
                         Microsoft Sound.wav";
 
     System.out.println("Playing '" + soundFile + "'...");
     returnCode = sndPlaySound(soundFile,flags);
   }
 }

Figure 2   HelloWindowsEx (MultiPlatform)

 public class HelloWindowsEx {
 
   /** @dll.import("winmm",entrypoint="sndPlaySound") */
   static native boolean playWAV(String lpszSound, int fuSound);
 
   public static void main (String args[]) {
 
     if (System.getProperty("os.name").startsWith("Windows")) {
 
       // If the com.ms.util.SystemVersionManager class is not found, 
       // catch the NoClassDefFoundError
 
       try {
 
         java.util.Properties vmProperties = 
             com.ms.util.SystemVersionManager.getVMVersion();
         int majorVersion   = (new 
             Integer(vmProperties.getProperty("MajorVersion"))).intValue();
         int minorVersion   = (new 
             Integer(vmProperties.getProperty("MinorVersion"))).intValue();
         int buildIncrement = (new 
             Integer(vmProperties.getProperty("BuildIncrement"))).intValue();
       
         if ((majorVersion >= 4) && (minorVersion >= 79) && 
             (buildIncrement >= 2164)) 
         {
 
           boolean returnCode;
           int     flags     = 0;
           String  soundFile = System.getProperty("com.ms.windir") + "\\MEDIA\\The 
                               Microsoft Sound.wav";
 
           System.out.println("Playing '" + soundFile + "'...");
           returnCode = playWAV(soundFile,flags);
         } else {
 
           // Not the right version of the VM
 
           System.out.println("J/Direct requires VM Version 4.79.2252 or higher.");
         }
       } catch (NoClassDefFoundError e) {
 
         System.out.println("Class " + e.getMessage() + " not found.");
 
         // If com/ms/util/SystemVersionManager is not on the system, 
         // then this is probably not the VM.
 
         if (e.getMessage().equals("com/ms/util/SystemVersionManager")) {
           System.out.println("J/Direct requires VM Version 4.79.2252 or higher.");
         }
 
       }
     } else {
 
         // This isn't Windows.
 
         System.out.println("J/Direct requires a Windows system.");
     }
   }
 }
 

Figure 3
Parameter and Return Value

Native C Type	Java Type
BOOL	boolean
BOOL[]	boolean[]
BYTE	byte
BYTE*	byte[]
CHAR	byte
CLSID*	com.ms.com._Guid
double	double
double*	double[]
DWORD	int
DWORD*	int[]
float	float
float*	float[]
GUID*	com.ms.com._Guid
IID*	com.ms.com._Guid
INT	int
LONG	int
LPCSTR	String
Note: LPCSTR/String may be used as parameters but not as return values. In OLE mode, however, String maps to LPWSTR and both are permitted as return values. The Microsoft VM frees the string by using CoTaskMemFree.
LPSTR	StringBuffer
SAFEARRAY*	com.ms.com.SafeArray
Note: May only be passed as parameter, not as return value.
SHORT	short
UINT	int
ULONG	int
VARIANT*	com.ms.com.Variant
VOID	void
Note: void/VOID may not be used as parameters and may only be used as return values.
WORD	short
WORD*	short[]
__int64	long
__int64*	long[]
COM interface	interface
Note: Must use jactivex or similar tool to generate interface.
function pointer	com.ms.dll.Callback
Note: May only be passed as parameter, not as return value.
pointer to struct	Object
Note: An IUnknown* is used instead of a pointer to a struct in OLE mode.

Figure 4
Parameter and Return Value

Visual Basic Type	Java Type
Byte	byte
Double	double
Integer	short
Long	boolean
Long	int
Single	float
VARIANT	com.ms.com.Variant

Figure 5   Applet Using J/Direct

 import com.ms.security.*;
 
 public class HelloIE extends com.ms.ui.UIApplet {
   /** @dll.import("winmm") */
   static native boolean sndPlaySound(String lpszSound, int fuSound);
 
   public String soundFile = new String();
 
   public void init() {
     PolicyEngine.assertPermission(PermissionID.SYSTEM);
     soundFile  = System.getProperty("com.ms.windir") + "\\MEDIA\\The Microsoft 
                  Sound.wav";
     String  buttonText = "Play '" + soundFile + "'";
 
     setLayout(new com.ms.ui.UIBorderLayout(0, 0));
     add(new com.ms.ui.UIPushButton(buttonText), "Center");
   }
 
   public boolean action(java.awt.Event e, Object arg) {
     if ( arg instanceof com.ms.ui.UIPushButton ) {
       PolicyEngine.assertPermission(PermissionID.SYSTEM);
       boolean returnCode = sndPlaySound(soundFile,0);
     }
     return true;
   }
 }

Figure 6   Batch File for Signing CAB

 rem //-------------------------
 rem // Enable test certificates
 rem //-------------------------
 setreg.exe 1 true
 rem
 rem //-------------------------
 rem // Compile HelloIE
 rem //-------------------------
 jvc.exe HelloIE.java
 rem
 rem //-------------------------
 rem // Turn .class into .cab
 rem //-------------------------
 cabarc.exe -s 6144 n hello.cab HelloIE.class
 rem
 rem //-------------------------
 rem // Make a test certificate
 rem //-------------------------
 makecert.exe -sv hello.key -n "CN=My Publisher Name" hello.cer
 cert2spc.exe hello.cer hello.spc
 rem
 rem //-------------------------
 rem // Digitally sign .cab
 rem //-------------------------
 signcode.exe -j javasign.dll -jp low -spc hello.spc -v hello.key hello.cab
 rem
 rem //-------------------------
 rem // Launch the web page
 rem //-------------------------
 start hello.htm