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| package ffa.demo; | |
| import jdk.incubator.foreign.CLinker; | |
| import jdk.incubator.foreign.FunctionDescriptor; | |
| import jdk.incubator.foreign.MemoryAddress; | |
| import jdk.incubator.foreign.ResourceScope; | |
| import java.lang.invoke.MethodHandle; | |
| import java.lang.invoke.MethodType; | |
| public class App { | |
| public static void main(String[] args) throws Throwable { | |
| final MemoryAddress printf = CLinker.systemLookup().lookup("printf").get(); // lookup native C printf function from library | |
| MethodHandle printfMh = CLinker.getInstance().downcallHandle( | |
| printf, | |
| MethodType.methodType(int.class, MemoryAddress.class),// C printf represent in Java | |
| FunctionDescriptor.of(CLinker.C_INT,CLinker.C_POINTER) // C => int printf(char*) | |
| ); | |
| try (var scope = ResourceScope.newConfinedScope()) { | |
| var cString = CLinker.toCString("Hello World from C world.\n", scope); | |
| int len = (int)printfMh.invokeExact(cString.address()); | |
| } | |
| } | |
| } |
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