On Nov 19, 2007, at 3:29 PM, rzo wrote:
Hello,
the constructor Pointer(long peer) is not public. Could you pls set
it to public.
I have the following issue:
I am receiving messages through a callback function.
The function definition requires an int (LPARAM), which is
sometimes interpreted as int sometimes as a window handle.
LRESULT CALLBACK HookProc(
int nCode, WPARAM wParam, LPARAM lParam
);
But
HWND hWnd = new Pointer(lParam)
is currently not possible.
I tried to define LPARAM as UNION, so that I could interpret it as
int or Pointer, but this does not seem to work. It always returns
null.
Before you can extract a non-primitive type from a union, you must
set the active field via Union.setType(), e.g.
class LPARAM extends Union {
public int iParam;
public Pointer pParam;
}
LRESULT callback(int nCode, WPARAM wParam, LPARAM lParam) {
// assuming LPARAM is a union
lParam.setType(Pointer.class);
lParam.read();
// Pointer field may now be read accurately
System.out.println("Pointer value is " + lParam.pParam);
}
"setType" is required to avoid populating the Java Union fields with
bogus objects. If you still get a "null" (and you know the value is
not null), please file a bug on the issue.
Alternatively, you can define your callback parameters to be the
specific type being used (see the w32keyhook example and the HOOKPROC
defs in examples/win32/User32.java).
1 message in net.java.dev.jna.usersRe: [jna-users] Feature Request: publ...
