Hi, sorry for my English. I am working with a library that manages a String wrapper (MyString), because it does not use null terminated Strings. Then it has a function to create from a null terminated String.

Data mapping:

------------- In the C side: struct MyString { char *ptr; int slen; }

MyString mystr_create(char *str){ MyString dst; dst.ptr = str; dst.slen = strlen(str);

return dst; }

int mystr_len(const MyString *str){ return str->slen; }

In the java side: public class MyString extends Structure { public static class ByValue extends MyString implemets Structure.ByValue {} public Pointer ptr; public int slen; }

public MyString.ByValue mystr_create(String str);

public int mystr_len(MyString str);

An use example (java):

---------------------- MyString myStr = fooLibrary.mystr_create(new String("Hello world!")); System.out.println(myStr); System.out.println("Length: " + fooLibrary.mystr_len(myStr));

Out:

---- MyString$ByValue(allocated@0xafd3c10 (8 bytes)) { Pointer ptr@0=native@0xafd3bc8 int slen@4=12 } Length: 1870078063

As we can see, the creation is ok, but when pass a Struct.ByValue reference in a const pointer parameter the integer value is wrong. The example is runnig on: Windows XP SP2 + Eclipse 3.2.0 + jdk1.6.0_04 + dll is compiled with Visual C++ 2008 Express.

Best regards and exelent work! Ramiro

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