Hello,

yes, I know such questions may not be seen very well but I am really stuck here.

I want to send a KeyStroke to "SendInput" in user32.dll. I looked up some things at pinvoke and tried the procedure itself in VS2008 and C#. I think I did everything right while copying and changing it to Java and JNA, but it won't work.

The interface is pretty straight forward:

public interface User32 extends StdCallLibrary {

public static final User32 INSTANCE = (User32)Native.loadLibrary("user32", User32.class);

/** * static extern uint SendInput(uint nInputs, INPUT [] pInputs, int cbSize); */ public abstract int SendInput(int nInputs, INPUT[] pInputs, int cbSize); }

As I do not really know what type to use as Structure Array I already tried INPUT[], Structure[], ByRef, PointerType etc pp.

The Structs are: public static class MOUSEINPUT extends Structure { public int dx; public int dy; public int mouseData; public int dwFlags; public int time; public int dwExtraInfo; }

public static class KEYBDINPUT extends Structure { public short wVk; public short wScan; public int dwFlags; public int time; public int dwExtraInfo; }

public static class HARDWAREINPUT extends Structure { public int uMsg; public short wParamL; public short wParamH; }

public static class INPUT extends Structure { public int type; public MOUSEINPUT mi; public KEYBDINPUT ki; public HARDWAREINPUT hi; }

And I call it by: User32 user32 = User32.INSTANCE;

INPUT in = new INPUT(); in.type = 1; in.ki.wVk = 0x5B; // Keycode für LWIN in.ki.dwFlags = 0x00; // Keydown INPUT[] input = (INPUT[])in.toArray(1); int out = user32.SendInput(input.length, input, 28);

INPUT in2 = new INPUT(); in2.type = 1; in2.ki.wVk = 0x5B; // Keycode für LWIN in2.ki.dwFlags = 0x02; // Keydown INPUT[] input2 = (INPUT[])in2.toArray(2); out = user32.SendInput(input2.length, input2, 28);

The 28 come from Marshalling it under C#, but I tried everything over length, size etc pp. If it's input[0].size int out returns 0, if it's 28 int out returns 1, which if I understood correctly means one key is pressed, but still nothing happens.

I tried to do it ByReference as suggested in the APIDoc but same effect.

I really hope someone can enlighten me as I am really out of ideas here. Thanks in advance.

Regards