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javah(1)                                                              javah(1)

Name
       javah - C Header and Stub File Generator

          javah  produces C header files and C source files from a Java class.
          These files provide the connective glue that allow your Java  and  C
          code to interact.

SYNOPSIS
       javah [ options ] fully-qualified-classname. . .
       javah_g [ options ] fully-qualified-classname. . .

DESCRIPTION
       javah  generates C header and source files that are needed to implement
       native methods. The generated header and source files  are  used  by  C
       programs to reference an object's instance variables from native source
       code. The .h file contains a struct definition whose  layout  parallels
       the  layout of the corresponding class. The fields in the struct corre-
       spond to instance variables in the class.

       The name of the header file and the structure declared  within  it  are
       derived  from  the  name  of the class. If the class passed to javah is
       inside a package, the package name is prepended to both the header file
       name  and  the  structure name. Underscores (_) are used as name delim-
       iters.

       By default javah creates a header file for each  class  listed  on  the
       command  line  and  puts  the  files  in the current directory. Use the
       -stubs option to create source files. Use the -o option to  concatenate
       the results for all listed classes into a single file.

       The  new native method interface, Java Native Interface (JNI), does not
       require header information or stub files. javah can still  be  used  to
       generate native method function proptotypes needed for JNI-style native
       methods. javah produces JNI-style output by  default,  and  places  the
       result in the .h file.

       javah_g  is  a  non-optimized  version  of  javah suitable for use with
       debuggers like jdb(1).

OPTIONS
          -o outputfile
             Concatenates the resulting header or source  files  for  all  the
             classes  listed  on the command line into outputfile. Only one of
             -o or -d may be used.

          -d directory
             Sets the directory where javah saves the header files or the stub
             files. Only one of -d or -o may be used.

          -stubs
             Causes  javah  to  generate  C  declarations from the Java object
             file.

          -verbose
             Indicates verbose output and causes javah to print a  message  to
             stdout concerning the status of the generated files.

          -help
             Print help message for javah usage.

          -version
             Print out javah version information.

          -jni
             Causes javah to create an output file containing JNI-style native
             method function prototypes. This is the default output, so use of
             -jni is optional.

          -classpath path
             Specifies  the  path javah uses to look up classes. Overrides the
             default or the CLASSPATH  environment  variable  if  it  is  set.
             Directories  are separated by colons. Thus the general format for
             path is:

                .:<your_path>

             For example:

                .:/home/avh/classes:/usr/local/java/classes

          As a special convenience, a class path element containing a basename
          of  * is considered equivalent to specifying a list of all the files
          in the directory with the extension .jar or  .JAR  (a  java  program
          cannot tell the difference between the two invocations).
          For  example,  if  directory  foo contains a.jar and b.JAR, then the
          class path element foo/* is expanded to a A.jar:b.JAR,  except  that
          the  order  of jar files is unspecified. All jar files in the speci-
          fied directory, even hidden ones, are included in the list. A class-
          path  entry  consisting simply of * expands to a list of all the jar
          files in the current directory. The CLASSPATH environment  variable,
          where  defined,  will  be similarly expanded. Any classpath wildcard
          expansion occurs before the Java virtual machine is  started  --  no
          Java  program  will ever see unexpanded wildcards except by querying
          the environment.  For  example;  by  invoking  System.getenv("CLASS-
          PATH").

          -bootclasspath path
             Specifies  path from which to load bootstrap classes. By default,
             the bootstrap classes are the classes implementing the core  Java
             2 platform located in jre/lib/rt.jar and several other jar files.

          -old
             Specifies that old JDK1.0-style header files should be generated.

          -force
             Specifies that output files should always be written.

          -Joption
             Pass  option  to the Java virtual machine, where option is one of
             the options described on the reference page for the java(1).  For
             example, -J-Xms48m sets the startup memory to 48 megabytes.

ENVIRONMENT VARIABLES
          CLASSPATH
             Used to provide the system a path to user-defined classes. Direc-
             tories are separated by colons, for example,

SEE ALSO
       javac(1), java(1), jdb(1), javap(1), javadoc(1)

                                  06 Apr 2010                         javah(1)
 

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Gedruckt am: 11.12.2017 14:05 GMT+0100 (2017-12-11T14:05:21+01:00)