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179 lines
6.8 KiB
HTML
179 lines
6.8 KiB
HTML
<html>
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<head>
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<meta http-equiv="Content-Language" content="en-us">
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<link rel="stylesheet" type="text/css" href="../stylesheets/style.css">
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<title>Javah Task</title>
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</head>
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<body>
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<h2><a name="javah">Javah</a></h2>
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<h3>Description</h3>
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<p>Generates JNI headers from a Java class.</p>
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<p> When this task executes, it will generate the C header and source files that
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are needed to implement native methods. JNI operates differently depending on
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whether <a href="http://java.sun.com/j2se/1.3/docs/tooldocs/win32/javah.html">JDK1.2</a>
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(or later) or <a href="http://java.sun.com/products/jdk/1.1/docs/tooldocs/win32/javah.html">pre-JDK1.2</a>
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systems are used.</p>
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<p>It is possible to use different compilers. This can be selected
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with the <code>implementation</code> attribute. <a
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name="implementationvalues">Here are the choices</a>:</p>
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<ul>
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<li>default - the default compiler (kaffeh or sun) for the platform.</li>
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<li>sun (the standard compiler of the JDK)</li>
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<li>kaffeh (the native standard compiler of <a href="http://www.kaffe.org" target="_top">Kaffe</a>)</li>
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</ul>
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<h3>Parameters</h3>
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<table border="1" cellpadding="2" cellspacing="0">
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<tr>
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<td valign="top"><b>Attribute</b></td>
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<td valign="top"><b>Description</b></td>
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<td valign="top" align="center"><b>Required</b></td>
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</tr>
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<tr>
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<td valign="top">class</td>
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<td valign="top">the fully-qualified name of the class (or classes,
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separated by commas)</td>
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<td align="center" valign="top">Yes</td>
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</tr>
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<tr>
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<td valign="top">outputFile</td>
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<td valign="top">concatenates the resulting header or source files for all the classes listed into this file</td>
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<td align="center" valign="middle" rowspan="2">Yes</td>
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</tr>
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<tr>
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<td valign="top">destdir</td>
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<td valign="top">sets the directory where javah saves the header files or the
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stub files.</td>
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</tr>
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<tr>
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<td valign="top">force</td>
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<td valign="top">specifies that output files should always be written (JDK1.2 only)</td>
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<td valign="top" align="center">No</td>
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</tr>
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<tr>
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<td valign="top">old</td>
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<td valign="top">specifies that old JDK1.0-style header files should be generated
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(otherwise output file contain JNI-style native method function prototypes) (JDK1.2 only)</td>
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<td valign="top" align="center">No</td>
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</tr>
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<tr>
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<td valign="top">stubs</td>
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<td valign="top">generate C declarations from the Java object file (used with old)</td>
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<td valign="top" align="center">No</td>
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</tr>
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<tr>
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<td valign="top">verbose</td>
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<td valign="top">causes Javah to print a message concerning the status of the generated files</td>
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<td valign="top" align="center">No</td>
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</tr>
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<tr>
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<td valign="top">classpath</td>
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<td valign="top">the classpath to use.</td>
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<td align="center" valign="top">No</td>
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</tr>
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<tr>
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<td valign="top">bootclasspath</td>
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<td valign="top">location of bootstrap class files.</td>
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<td valign="top" align="center">No</td>
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</tr>
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<tr>
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<td valign="top">extdirs</td>
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<td valign="top"> location of installed extensions.</td>
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<td valign="top" align="center">No</td>
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</tr>
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<tr>
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<td valign="top">implementation</td>
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<td valign="top">The compiler implementation to use. If this
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attribute is not set, the default compiler for the current VM
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will be used. (See the above <a
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href="#implementationvalues">list</a> of valid compilers.)</td>
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<td align="center" valign="top">No</td>
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</tr>
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</table>
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<p>Either outputFile or destdir must be supplied, but not both. </p>
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<h3>Parameters specified as nested elements</h3>
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<h4>arg</h4>
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<p>You can specify additional command line arguments for the compiler
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with nested <code><arg></code> elements. These elements are
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specified like <a href="../using.html#arg">Command-line Arguments</a>
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but have an additional attribute that can be used to enable arguments
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only if a given compiler implementation will be used.</p>
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<table border="1" cellpadding="2" cellspacing="0">
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<tr>
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<td width="12%" valign="top"><b>Attribute</b></td>
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<td width="78%" valign="top"><b>Description</b></td>
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<td width="10%" valign="top"><b>Required</b></td>
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</tr>
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<tr>
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<td valign="top">value</td>
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<td align="center" rowspan="4">See
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<a href="../using.html#arg">Command-line Arguments</a>.</td>
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<td align="center" rowspan="4">Exactly one of these.</td>
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</tr>
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<tr>
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<td valign="top">line</td>
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</tr>
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<tr>
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<td valign="top">file</td>
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</tr>
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<tr>
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<td valign="top">path</td>
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</tr>
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<tr>
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<td valign="top">implementation</td>
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<td>Only pass the specified argument if the chosen compiler
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implementation matches the value of this attribute. Legal values
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are the same as those in the above <a
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href="#implementationvalues">list</a> of valid compilers.)</td>
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<td align="center">No</td>
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</tr>
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</table>
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<h3>Examples</h3>
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<pre> <javah destdir="c" class="org.foo.bar.Wibble"/></pre>
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<p>makes a JNI header of the named class, using the JDK1.2 JNI model. Assuming
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the directory 'c' already exists, the file <tt>org_foo_bar_Wibble.h</tt>
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is created there. If this file already exists, it is left unchanged.</p>
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<pre> <javah outputFile="wibble.h">
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<class name="org.foo.bar.Wibble,org.foo.bar.Bobble"/>
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</javah></pre>
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<p>is similar to the previous example, except the output is written to a file
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called <tt>wibble.h</tt>
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in the current directory.</p>
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<pre> <javah destdir="c" force="yes">
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<class name="org.foo.bar.Wibble"/>
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<class name="org.foo.bar.Bobble"/>
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<class name="org.foo.bar.Tribble"/>
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</javah></pre>
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<p>writes three header files, one for each of the classes named. Because the
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force option is set, these header files are always written when the Javah task
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is invoked, even if they already exist.</p>
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<pre> <javah destdir="c" verbose="yes" old="yes" force="yes">
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<class name="org.foo.bar.Wibble"/>
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<class name="org.foo.bar.Bobble"/>
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<class name="org.foo.bar.Tribble"/>
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</javah>
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<javah destdir="c" verbose="yes" stubs="yes" old="yes" force="yes">
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<class name="org.foo.bar.Wibble"/>
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<class name="org.foo.bar.Bobble"/>
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<class name="org.foo.bar.Tribble"/>
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</javah></pre>
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<p>writes the headers for the three classes using the 'old' JNI format, then
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writes the corresponding .c stubs. The verbose option will cause Javah to
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describe its progress.</p>
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<hr>
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<p align="center">Copyright © 2001-2002,2004-2005 The Apache Software Foundation. All rights
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Reserved.</p>
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</body>
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</html>
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