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POError while passing array of structures conataining char array to native function using JNA
 

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  1. POError while passing array of structures conataining char array to native function using JNA
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    <p>Here is my updated code after implementing suggestions. But still problems persist. </p> <pre><code>typedef struct S1{ char temp1[100]; char temp2[100]; }S1 ... int manipulateTemp(S1 s1Arr[] ); JNA interface looks like this public interface Add extends Library { Add INSTANCE = (Add) Native.loadLibrary("add", Add.class); public static class S1 extends Structure { public byte[] temp1 = new byte[100]; public byte[] temp2 = new byte[100]; public static class ByReference extends S1 implements Structure.ByReference { }; }; int manipulateTemp( S1[]); } // public static byte[] toByteArray(char[] a ,Charset c){ CharBuffer cBuffer = CharBuffer.wrap(a); ByteBuffer bBuffer = c.encode(cBuffer); return bBuffer.array; } //in main method Add lib = Add.INSTANCE; Add.S1.ByReference s1Ref = new Add.S1.ByReference(); Add.S1[] s1Arr = (Add.S1[])s1Ref.toArray(10); s1Ref.clear(); //initialize array for(int i =0;i&lt;s1Arr.lenth ;i++){ byte[] data = toByteArray("myString1".toCharArray,Charset.defaultCharSet System.arrarycopy(data,0, s1Arr[i].temp1,0,data.length); data = toByteArray("myString2".toCharArray,Charset.defaultCharSet System.arrarycopy(data,0, s1Arr[i].temp2,0,data.length); } // calling native function lib.manipulateTemp(s1Arr[]); After execution Exception in thread "main" java.lang.Error: Invalid memory access at com.sun.jna.Function.invokeInt(Native Method) at com.sun.jna.Function.invoke(Function.java:344) at com.sun.jna.Function.invoke(Function.java:276) at com.sun.jna.Library$Handler.invoke(Library.java:216) at com.sun.proxy.$Proxy0.manipulateTemp((Unknown Source) at LoanTest.newTestCalc.main(newTestCalc.java:288) </code></pre> <p>I even checked memory dump, structures are seems to be allocated stored correctly.Structure size is also correct = 200 bytes Any clues about this error?</p>
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    1. USJava Kingdom
    1. USJava Kingdom
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    1. This table or related slice is empty.
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    1. COAs far as size for array of structure is concerned it is fixed..Using #define in native code..
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      1. USJava Kingdom
 

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