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72 строки
2.8 KiB
Plaintext
72 строки
2.8 KiB
Plaintext
https://github.com/bytedeco/sample-projects
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2018
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https://www.youtube.com/watch?v=yzFWaQaLRkM
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MyExample.java/cpp
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https://www.youtube.com/watch?v=LZrrqZLhtmw
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https://github.com/oltzen/JavaCppExample
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https://github.com/oltzen/JavaCppExample/blob/master/src/main/java/de/oltzen/javacppexample/Abc.java
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https://github.com/bytedeco/javacpp#accessing-native-apis
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// NativeLibrary.h
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#include <string>
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namespace NativeLibrary {
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class NativeClass {
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public:
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const std::string& get_property() { return property; }
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void set_property(const std::string& property) { this->property = property + "aaa"; }
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std::string property;
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};
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}
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// NativeLibrary.java
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import org.bytedeco.javacpp.*;
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import org.bytedeco.javacpp.annotation.*;
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@Platform(include="NativeLibrary.h")
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@Namespace("NativeLibrary")
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public class NativeLibrary {
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public static class NativeClass extends Pointer {
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static { Loader.load(); }
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public NativeClass() { allocate(); }
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private native void allocate();
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// to call the getter and setter functions
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public native @StdString String get_property(); public native void set_property(String property);
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// to access the member variable directly
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public native @StdString String property(); public native void property(String property);
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}
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public static void main(String[] args) {
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// Pointer objects allocated in Java get deallocated once they become unreachable,
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// but C++ destructors can still be called in a timely fashion with Pointer.deallocate()
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NativeClass l = new NativeClass();
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l.set_property("Hello World!");
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System.out.println(l.property());
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}
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}
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$ javac -cp javacpp.jar NativeLibrary.java
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$ java -jar javacpp.jar NativeLibrary -nodelete
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Generating /data/wrk/prj/cpp/javacpp/nativelib/jnijavacpp.cpp
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Generating /data/wrk/prj/cpp/javacpp/nativelib/jniNativeLibrary.cpp
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Compiling /data/wrk/prj/cpp/javacpp/nativelib/linux-x86_64/libjniNativeLibrary.so
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g++ -I/home/iharh/.sdkman/candidates/java/8.0.172-zulu/include -I/home/iharh/.sdkman/candidates/java/8.0.172-zulu/include/linux /data/wrk/prj/cpp/javacpp/nativelib/jniNativeLibrary.cpp /data/wrk/prj/cpp/javacpp/nativelib/jnijavacpp.cpp -march=x86-64 -m64 -O3 -s -Wl,-rpath,$ORIGIN/ -Wl,-z,noexecstack -Wl,-Bsymbolic -Wall -fPIC -shared -o libjniNativeLibrary.so
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Keeping /data/wrk/prj/cpp/javacpp/nativelib/jniNativeLibrary.cpp
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Keeping /data/wrk/prj/cpp/javacpp/nativelib/jnijavacpp.cpp
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generates
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linux-x86_64/libjniNativeLibrary.so
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$ java -cp ~/Downloads/javacpp-1.4.2.jar:. NativeLibrary
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Hello World!aaa
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https://github.com/bytedeco/javacpp/blob/master/src/test/java/org/bytedeco/javacpp/AdapterTest.java
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https://github.com/bytedeco/javacpp/blob/master/src/test/resources/org/bytedeco/javacpp/AdapterTest.h
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