This directory contains the JavaCPP Presets module for:
- helloworld 2.0 https://github.com/bytedeco/helloworld
Please refer to the parent README.md file for more detailed information about the JavaCPP Presets.
Java API documentation is available here:
Here is a simple example of helloworld ported to Java from this C source file:
We can use Maven 3 to download and install automatically all the class files as well as the native binaries. To run this sample code, after creating the pom.xml and HelloWorldTest.java source files below, simply execute on the command line:
$ mvn compile exec:java<project>
<modelVersion>4.0.0</modelVersion>
<groupId>org.bytedeco.helloworld</groupId>
<artifactId>helloworld-test</artifactId>
<version>1.5.2-SNAPSHOT</version>
<properties>
<exec.mainClass>HelloWorldTest</exec.mainClass>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>org.bytedeco</groupId>
<artifactId>helloworld-platform</artifactId>
<version>2.0-1.5.2-SNAPSHOT</version>
</dependency>
</dependencies>
<build>
<sourceDirectory>.</sourceDirectory>
</build>
</project>import java.io.UnsupportedEncodingException;
import java.nio.ByteBuffer;
import java.nio.charset.Charset;
import org.bytedeco.helloworld.PersonTypePtr;
import org.bytedeco.javacpp.BytePointer;
import static org.bytedeco.helloworld.global.helloworld.*;
public class HelloWorldTest {
public static void main(String[] args) throws UnsupportedEncodingException {
{
System.out.println("READ -------------------------------------------------");
boolean b = getBool();
System.out.printf("J boolean = %b%n", b);
byte by = getByte();
System.out.printf("J byte = %d%n", by);
char c = getChar();
System.out.printf("J char = \\u%04X%n", (int) c);
short s = getShort();
System.out.printf("J short = %d%n", s);
int i = getInt();
System.out.printf("J int = %d%n", i);
long l = getLong();
System.out.printf("J long = %d%n", l);
BytePointer bp1 = getUtf8String();
System.out.printf("J UTF-8 String = %s%n", bp1.getString());
{
// Person
PersonTypePtr person = getPerson();
System.out.printf("J PersonType.firstname = %s%n", person.firstname().getString());
System.out.printf("J PersonType.lastname = %s%n", person.lastname().getString());
// PersonPtr
PersonTypePtr personPtr = getPersonPtr();
System.out.printf("J PersonType.firstname = %s%n", personPtr.firstname().getString());
System.out.printf("J PersonType.lastname = %s%n", personPtr.lastname().getString());
// PersonType
PersonTypePtr personType = getPersonType();
System.out.printf("J PersonType.firstname = %s%n", personType.firstname().getString());
System.out.printf("J PersonType.lastname = %s%n", personType.lastname().getString());
// PersonTypePtr
PersonTypePtr personTypePtr = getPersonTypePtr();
System.out.printf("J PersonType.firstname = %s%n", personTypePtr.firstname().getString());
System.out.printf("J PersonType.lastname = %s%n", personTypePtr.lastname().getString());
}
}
{
System.out.println("WRITE ------------------------------------------------");
printBool(true);
printBool(false);
printByte(Byte.MIN_VALUE);
printByte(Byte.MAX_VALUE);
printChar(Character.MIN_VALUE);
printChar(Character.MAX_VALUE);
printShort(Short.MIN_VALUE);
printShort(Short.MAX_VALUE);
printInt(Integer.MIN_VALUE);
printInt(Integer.MAX_VALUE);
printLong(Long.MIN_VALUE);
printLong(Long.MAX_VALUE);
// byte array
byte[] tmp = ("Hello z\u00df\u6c34" + new String(Character.toChars(0x0001F34C)) + " byte array!").getBytes(Charset.forName("UTF-8"));
byte[] array = new byte[tmp.length + 1];
System.arraycopy(tmp, 0, array, 0, tmp.length);
array[array.length - 1] = 0;
printUtf8String(array);
// ByteBuffer
final byte[] bytes = ("Hello z\u00df\u6c34" + new String(Character.toChars(0x0001F34C)) + " ByteBuffer!").getBytes(Charset.forName("UTF-8"));
ByteBuffer buf = ByteBuffer.allocateDirect(bytes.length + 1);
buf.put(bytes);
buf.put((byte) 0);
buf.rewind();
printUtf8String(buf);
// ByteBuffer
BytePointer bp2 = new BytePointer("Hello z\u00df\u6c34" + new String(Character.toChars(0x1F34C)) + " BytePointer!", "UTF-8");
printUtf8String(bp2);
{
// Person
PersonTypePtr person = new PersonTypePtr();
person.firstname(new BytePointer("John"));
person.lastname(new BytePointer("Doe"));
printPerson(person);
// PersonPtr
PersonTypePtr personPtr = new PersonTypePtr();
personPtr.firstname(new BytePointer("John"));
personPtr.lastname(new BytePointer("Doe"));
printPersonPtr(personPtr);
// PersonType
PersonTypePtr personType = new PersonTypePtr();
personType.firstname(new BytePointer("John"));
personType.lastname(new BytePointer("Doe"));
printPersonType(personType);
// PersonTypePtr
PersonTypePtr personTypePtr = new PersonTypePtr();
personTypePtr.firstname(new BytePointer("John"));
personTypePtr.lastname(new BytePointer("Doe"));
printPersonTypePtr(personTypePtr);
}
}
}
}