Ned help with marshaling (SendMessage, lparam, WM_MOUSEMOVE)

[Ryan Ross]

Hello,

I need some help with the SendMessage method. I've imported it into C# with
the following statement:

[DllImport("user 32.dll", SetLastError=tr ue)]

public static extern IntPtr SendMessage(Int Ptr hWnd, int Msg, long wparam,
int lparam);

and the following for sending the message:

User32.SendMess age(WindowObjec t_Basic_GDI_Han dle, User32.WM_MOUSE MOVE,
User32.MK_LBUTT ON, MakeLParam(X, Y));

and below for constructing the lparam:

private int MakeLParam(int LoWord, int HiWord)
{

//System.Diagnost ics.Debug.Write Line("LoWord: " + LoWord2(((HiWor d << 16) |
(LoWord & 0xffff))));

return (int) ((HiWord << 16) | (LoWord & 0xffff));
}

Unfortunately, whenever I send a WM_MOUSEMOVE message to a window
(Notepad.exe), the lparam parameter doesn't mike it there!

Spy++ reports X and Y coordinates of 0. (Everything else makes it there ok).

Does anyone have ideas what kind or marshaling I need to do, or if I am
sending the correct data?

Thanks,

Ryan

[Mick Doherty]

wparam should be int not long.

I prefer to use IntPtr though which would allow you to send a long value.

[DllImport("user 32.dll", SetLastError=tr ue)]
public static extern IntPtr SendMessage(Int Ptr hWnd, int Msg, IntPtr wparam,
IntPtr lparam);

SendMessage(thi s.Handle, 0x200, (IntPtr)(long)0 x1, (IntPtr)MakeLPa ram(X,Y));

--
Mick Doherty
http://dotnetrix.co.uk/nothing.html
"Ryan Ross" <ry***@nni.co m> wrote in message
news:0s******** ************@nn i.com...

Hello,

I need some help with the SendMessage method. I've imported it into C#
with the following statement:

[DllImport("user 32.dll", SetLastError=tr ue)]

public static extern IntPtr SendMessage(Int Ptr hWnd, int Msg, long wparam,
int lparam);

and the following for sending the message:

User32.SendMess age(WindowObjec t_Basic_GDI_Han dle, User32.WM_MOUSE MOVE,
User32.MK_LBUTT ON, MakeLParam(X, Y));

and below for constructing the lparam:

private int MakeLParam(int LoWord, int HiWord)
{

//System.Diagnost ics.Debug.Write Line("LoWord: " + LoWord2(((HiWor d << 16)
| (LoWord & 0xffff))));

return (int) ((HiWord << 16) | (LoWord & 0xffff));
}

Unfortunately, whenever I send a WM_MOUSEMOVE message to a window
(Notepad.exe), the lparam parameter doesn't mike it there!

Spy++ reports X and Y coordinates of 0. (Everything else makes it there
ok).

Does anyone have ideas what kind or marshaling I need to do, or if I am
sending the correct data?

Thanks,

Ryan

[Ryan Ross]

Ah, that works.

Thank You,
Ryan
"Mick Doherty"
<EX***********@ AND.REMOVE.SQUA REBRACKETS.[mdaudi100#ntlwo rld.com]> wrote in
message news:Oy******** *****@TK2MSFTNG P15.phx.gbl...

wparam should be int not long.

I prefer to use IntPtr though which would allow you to send a long value.

[DllImport("user 32.dll", SetLastError=tr ue)]
public static extern IntPtr SendMessage(Int Ptr hWnd, int Msg, IntPtr
wparam, IntPtr lparam);

SendMessage(thi s.Handle, 0x200, (IntPtr)(long)0 x1,
(IntPtr)MakeLPa ram(X,Y));

--
Mick Doherty
http://dotnetrix.co.uk/nothing.html
"Ryan Ross" <ry***@nni.co m> wrote in message
news:0s******** ************@nn i.com...

Hello,

I need some help with the SendMessage method. I've imported it into C#
with the following statement:

[DllImport("user 32.dll", SetLastError=tr ue)]

public static extern IntPtr SendMessage(Int Ptr hWnd, int Msg, long
wparam, int lparam);

and the following for sending the message:

User32.SendMess age(WindowObjec t_Basic_GDI_Han dle, User32.WM_MOUSE MOVE,
User32.MK_LBUTT ON, MakeLParam(X, Y));

and below for constructing the lparam:

private int MakeLParam(int LoWord, int HiWord)
{

//System.Diagnost ics.Debug.Write Line("LoWord: " + LoWord2(((HiWor d << 16)
| (LoWord & 0xffff))));

return (int) ((HiWord << 16) | (LoWord & 0xffff));
}

Unfortunately, whenever I send a WM_MOUSEMOVE message to a window
(Notepad.exe), the lparam parameter doesn't mike it there!

Spy++ reports X and Y coordinates of 0. (Everything else makes it there
ok).

Does anyone have ideas what kind or marshaling I need to do, or if I am
sending the correct data?

Thanks,

Ryan