Hi,

I have a problem passing a structure which contains a string. Here is what I am doing. Is that the right way to go? I get the expected result, but it triggers an exception, so I suppose something in my usage of JNA is wrong. But what ?

Thank you

Sebastien

* C type definition

typedef struct VI_TagEntry_t{

TCHAR* name;

} VI_TagEntry;

* Java JNA type definition

public static class VI_TagEntry extends Structure {

public WString name;

}

* Java test code (in test class called JNATest)

public void testVI_TagEntry() {

Dll.VI_TagEntry tagEntry = new Dll.VI_TagEntry();

tagEntry.name = new WString("sample text");

tagEntry.write();

lib.testVI_TagEntry(tagEntry); /* throws exception, see below */

}

* called C code

_declspec(dllexport) void __cdecl testVI_TagEntry(VI_TagEntry* tagEntry) {

printf("tagEntry.name=%S \n", tagEntry->name);

}

* output

tagEntry.name=sample text

* Exception at the line marked above

java.lang.RuntimeException: Exception setting field "name"

at com.sun.jna.Structure.readField(Structure.java:329)

at com.sun.jna.Structure.read(Structure.java:203)

at com.sun.jna.Function.invoke(Function.java:191)

at com.sun.jna.Library$Handler.invoke(Library.java:144)

at $Proxy0.testVI_TagEntry(Unknown Source)

at JNATest.testVI_TagEntry(JNATest.java:82)

(etc)

Caused by: java.lang.IllegalArgumentException

at
sun.reflect.UnsafeObjectFieldAccessorImpl.set(UnsafeObjectFieldAccessorImpl.java:63)

at java.lang.reflect.Field.set(Field.java:656)

at com.sun.jna.Structure.readField(Structure.java:326)

... 24 more