Hallo,

The function i use from native library takes as first argument a pointer to a structure, as second a callback function, ... . It looks like this: /**

* ID3BIO_EXPORTS_API DWORD __cdecl GetImage(

* STImage* pstImage,

* LPID3BIO_STATUS_ROUTINE lpUpdateFunc,

* PVOID pvUpdateContext,

* LPID3BIO_COMPLETION_ROUTINE lpCompletionRoutine,

* PVOID pvCompletionContext);

*/

int GetImage(

Pointer pstImage,

LPID3BIO_STATUS_ROUTINE lpUpdateFunc,

Pointer pvUpdateContext,

LPID3BIO_COMPLETION_ROUTINE lpCompletionRoutine,

Pointer pvCompletionContext);

pstImage is a pointer to the structure, which should receive the data. After completion the function calls assynchron the callback function 'lpUpdateFunc', which works really fine. Using the context i can access the structure. But i can not access any new data (The data seem to be unchanged, but they are definitly not). When i preset the buffer bevor call with 'FF' the VM crashes. The behaviour is a little bit unpredictable, sometimes 'GetImage' returns an error, sometimes VM crashes or nothing happens. What i make wrong?

Here the structure: /** * typedef struct * { * // pixels buffer : must be allocated by the caller * BYTE* pbyBuffer; * * // Number of columns * WORD wNbCol; * * // Number of Rows * WORD wNbRow; * * // pixels buffer size (in bytes) : must be initialized by the caller to IMAGE_SIZE * DWORD dwBufferSize; * * } STImage, *PSTImage; */ public class STImage extends Structure { /** pixels buffer : must be allocated by the caller */ // public byte[] pbyBuffer = new byte[IMAGE_SIZE]; public byte[] pbyBuffer;

/** Number of columns */ public short wNbCol;

/** Number of Rows */ public short wNbRow;

/** pixels buffer size (in bytes) : must be initialized by the caller to IMAGE_SIZE (public final int IMAGE_SIZE = (int)128400) */ public int dwBufferSize;

public STImage() { super(Structure.CALCULATE_SIZE, Structure.ALIGN_MSVC);

pbyBuffer = new byte[IMAGE_SIZE]; dwBufferSize = pbyBuffer.length;

// allocateMemory(dwBufferSize + 2 + 2 + 4); allocateMemory();

// // preset buffer for diagnostics // for (int idx = 0; idx < pbyBuffer.length; idx++) { // pbyBuffer[idx] = (byte)(0xFF & 0xFF); // } } }

Have you any idea?

Thanks in advance for your help,

Heinrich.