Java Native Access (JNA) provides pure Java access to native shared libraries without the need for additional native or JNI code.
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Questions tagged [jna]
1997 questions
6
votes
1 answer
Calling GetOpenFileName through JNA fails for Swing app
I'm trying to use the native Windows file dialog in Java, using JNA to call the comdlg32 function GetOpenFileName. I've made a static method, OpenFileDialog.display that looks like this:
public static List display(Window parent, boolean…
perp
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6
votes
2 answers
How to use JNA in .dll and .so with the same callback signature
I'm working on a java project to run on both Windows and Linux, and I'm using a third party shared library available to both operating systems with the same methods' signature. But, the dll's calling convention is stdcall while the shared object is…
Fernando
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6
votes
1 answer
JNA's W32API.* - where are they?
I just downloaded both jna.jar and platform.jar (ver. 3.2.7) from http://java.net/projects/jna/downloads/directory/3.2.7 and according to http://jna.java.net/javadoc/platform/com/sun/jna/platform/win32/W32API.html I should find the W32API interface…
JoeSlav
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6
votes
3 answers
Getting JNA to work with Java => C#?
I've written a lot of code in a C# library, which I now need to call from Java.
I saw it recommended on SO to use JNA, but I'm having trouble even getting out of the starting blocks; the documentation there is very sketchy.
Firstly, it only appears…
Shaul Behr
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6
votes
2 answers
Error linking JNA library on AdoptOpenJDK on MacOS
I am trying to run some JUnit tests over cassandra. But I get the following error:
[08/12/19 10:48:40:411](main)([]) INFO - c.h.c.c.e.EmbeddedCassandra - Starting embedded Cassandra server.
8/12/19 10:48:41:497](main)([]) ERROR -…
Pratik Shah
- 61
- 3
6
votes
2 answers
How can I declare an uint8_t array in Java
I have a C++ Function in my DLL that needs an uint8_t array as an input Parameter, so the array looks something like that:
uint8_t input[input_length] = { 0x30, 0x41, 0x80, 0x8A...};
I want to use this function in Java with JNA, which means I have…
conryyy
- 127
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6
votes
4 answers
renaming DLL functions in JNA using StdCallFunctionMapper
I'm trying to use JNA with a DLL in Windows, so far I was able to successfully call a function called c_aa_find_devices(). But all the functions start with c_aa and I would like to rename it to find_devices().
From what I gather the way to do this…
Jason S
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6
votes
1 answer
JavaFX Minimizing & Maximing undecorated stage with animations
I am using the accepted answer in this question: JavaFX Minimizing Undecorated Stage to minimize my app properly.
However, unfortunately the default Windows minimize & maximize animations are not shown at all (the window just appears and…
user38725
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6
votes
1 answer
How can I call a Go function from Java using the Java native interface?
It is possible to call C methods through the JNA interface in Java. How can I reach the same functionality with Go?
package main
import "fmt"
import "C"
//export Add
func Add(x, y int) int {
fmt.Printf("Go says: adding %v and %v\n", x, y)
…
dmotta
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6
votes
2 answers
JNA Struct and Pointer mapping
How does one map the function below to java?
VOID WriteToStruct(BOOL *Status, STRUCT_MSG RecBuff)
What this function does:
1) Populates the struct RecBuff
2) Updates status
How do I map to a boolean pointer in Java and access the struct data…
llang
6
votes
2 answers
Problem in accessing dll file from a Java program through JNA
I have a dll file and I am trying to call functions of it through a Java program through JNA
But the problem is It is not able to locate my dll file and throwing the following exception:
java.lang.UnsatisfiedLinkError: Unable to load library…
Amit
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6
votes
1 answer
JNA two dimensional arrays
I try to call a short** in C with JNA.
The C looks like this:
void compute(short** in, int row, int col) {
for (int i = 0; i < row; i++) {
for (int j = 0; j < col; j++) {
printf("in[%d][%d] = %d\n", i,j, in[i][j]);
…
Philippe Peter
- 75
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6
votes
1 answer
JNA direct vs interface mapping?
Sorry, this maybe a basic question. What are the difference between JNA direct mapping and interface mapping?
Is my interpretation correct:
Direct mapping: use the library object directly (like static main in Java)
Interface mapping: create an…
RockTheStar
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6
votes
1 answer
JNA: Set struct pointer to NULL
I am starting to use JNA to communicate with a device on the RS485 interface of a computer. Suprisingly to me I came to good results very quickly. But now I am stuck by a simple problem. The library I use accepts a pointer to a pointer of struct.…
Sebastian Götz
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6
votes
1 answer
How should I pass and return unsigned int by value from Java to C/C++ in jna
My C++ function
extern "C" {
DECLSPEC unsigned int STDCALL doNumberThing(unsigned int some_number);
}
My Java Interface
package com.myplace.nativeapi;
import com.sun.jna.Library;
import com.sun.jna.Memory;
import com.sun.jna.Pointer;
interface…
deworde
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