[news.eclipse.platform.swt] Re: Running SWT Outside Eclipse Instructions

["John Huss" <jhuss@xxxxxxxxxx>]

If you're going to bundle SWT with your application, then why bother 
installing it into the java home area, and just put it in your application 
directory instead?  This way you don't have to worry about them updating the 
JVM and you only have to install SWT once and it always works.  Plus you 
don't have to deal with versioning conflicts and you can even make changes 
to the SWT that you distribute if you like.  So I would question the wisdom 
of this approach.

John

"Robert B" <oh1226@xxxxxxxxxxx> wrote in message 
news:frc4cc$ls2$1@xxxxxxxxxxxxxxxxxxxx
> The following is my confidential(!) code that auto detect SWT and install
> automatically. Note that on Windows, JVM keeps change with new
> updates are installed. Users will suddenly find your application does not
> work! Don't know what cause the problem!!!! Panic!!!!
>
> Inlcude swt inside your JAR. Create a startup class with main(),
> but do not refer any SWT directly. Inside, SWT is installed or
> after install, call your main SWT class method. In this way, your
> program users won't p***d off!
>
> =================================================
>
> /**
>  * Checks if a JAR file with the name of the 1st argument
>  * is already installed into the Java Runtime running the
>  * application. For example, SWT package has a "swt.jar" file.
>  * You can check whether SWT package is installed or not as
>  * follows;
>  *
>  *    if (!isJarInstalled("swt.jar")) {
>  *       // install SWT here!
>  *    }
>  *
>  * param jarfilename a jar archive file name..
>  */
> static public boolean isJarInstalled(String jarfilename) {
>  String extdirs = System.getProperty("java.ext.dirs");
>  File f = new File(extdirs, jarfilename);
>  return f.exists();
> }
>
> /**
>  * This install a Jar file into the JVM's jar directory.
>  * Jar files can be JDBC drivers and SWT package or your own
>  * packages! This assumes that your JAR file containing a
>  * class definition specified at the first parameter
>  * the JAR file to install to JVM directory!
>  *
>  *   installJarFile(YourApp.class, "windows/swt.jar");
>  *
>  * param c a class name in the resource jar file containing the jar to 
> add.
>  * param jarpathname a jar archive path name.
>  */
> static public void installJarFile(Class c, String jarpathname) {
>  ClassLoader cl  = c.getClassLoader();
>  String extdirs  = System.getProperty("java.ext.dirs");
>
>  String jarname = null;
>  int x = jarpathname.lastIndexOf('/');
>  if (x >= 0) {
>   jarname = jarpathname.substring(x+1);
>  } else {
>   jarname = jarpathname;
>  }
>
>  InputStream stream = null;
>  if (cl!=null) {
>   stream = cl.getResourceAsStream(jarpathname);
>  } else {
>   stream = ClassLoader.getSystemResourceAsStream(jarpathname);
>  }
>  copyFile(stream, new File(extdirs, jarname));
> }
>
> /**
>  * Same as the previous one except that this accept input
>  * file instead.
>  *
>  * param in the jar file to be added.
>  * param jarfilename a name to be added as.
>  */
> static public void installJarFile(File in, String jarfilename) {
>  String extdirs = System.getProperty("java.ext.dirs");
>  try {
>   InputStream stream = new FileInputStream(in);;
>   copyFile(stream, new File(extdirs, jarfilename));
>  } catch (Throwable t) {
>   t.printStackTrace();
>  }
> }
>
> /**
>  * This install a DLL file into the JVM's DLL directory.
>  * DLL files can be JDBC drivers and SWT package or your own
>  * native packages! This assumes that your main JAR file contains
>  * the DLL file to install to JVM directory!
>  * For example, to install SWT package file located at "windows";
>  *
>  *   installDllFile("windows/swt-aswt-win32-3123.DLL");
>  *   installDllFile("windows/swt-gdip-win32-3123.DLL");
>  *   installDllFile("windows/swt-win32-3123.DLL);
>  *
>  * param c a class name in the resource jar file containing the DLL to 
> add.
>  * param dllpathname a dll file path name.
>  */
> static public void installDllFile(Class c, String dllpathname) {
>  ClassLoader cl  = c.getClassLoader();
>  String javahome = System.getProperty("java.home");
>  String dllhome  = javahome+File.separator+"bin";
>
>  String dllname = null;
>  int x = dllpathname.lastIndexOf('/');
>  if (x >= 0) {
>   dllname = dllpathname.substring(x+1);
>  } else {
>   dllname = dllpathname;
>  }
>
>  InputStream stream = null;
>  if (cl!=null) {
>   stream = cl.getResourceAsStream(dllname);
>  } else {
>   stream = ClassLoader.getSystemResourceAsStream(dllname);
>  }
>  copyFile(stream, new File(dllhome, dllpathname));
> }
>
> /**
>  * Same as the previous one except that this accept input
>  * file instead.
>  *
>  * param in the dll file to be added.
>  * param dllfilename a name to be added as.
>  */
> static public void installDllFile(File in, String dllfilename) {
>  String javahome = System.getProperty("java.home");
>  String dllhome  = javahome+File.separator+"bin";
>  try {
>   InputStream stream = new FileInputStream(in);;
>   copyFile(stream, new File(dllhome, dllfilename));
>  } catch (Throwable t) {
>   t.printStackTrace();
>  }
> }
>
> /**
>  * Copy files from input stream to output file.
>  */
> private static void copyFile(InputStream input, File output0) {
>  int    length = 512; // buffer block size
>  int    read_length;
>  long   sleeping = 1;
>  byte[] buffer = new byte[length];
>
>  // make sure that existing files deleted on Windows!
>  while (true) {
>   if (!output0.exists()) {
>    break;
>   }
>   try {Thread.sleep(sleeping);} catch (Exception e) {};
>   sleeping *= 2;
>   output0.delete();
>  }
>
>  FileOutputStream output = null;
>  try {
>   output = new FileOutputStream(output0);
>   while (true) {
>    read_length = input.read(buffer, 0, length);
>    if (read_length <= 0) {
>     break;
>    }
>    output.write(buffer, 0, read_length);
>   }
>  } catch (Throwable e) {
>   e.printStackTrace();
>  }
>  try {input.close();}  catch (Throwable t) {};
>  try {output.close();} catch (Throwable t) {};
> }
>
>
>
>
>