Hi,
i want to emulate a (synchronous) BroadCastSystem Message
with EnumWindows and SendMessage. I dont want to use
the BroadcastSystem Message because it needs the SE_TCB_NAME
Privilege (you dont have this in normal). So i decided to use the
EnumWindows with SendMessage. What i try here is to pass a
WM_USER+1111 with LParam and WParam, pointing to strings.
But when i try to get the strings at the other end with
Marshal.PtrToSt ringAnsi,
the String itself is empty. I dont know what the mistake here is, so
a little code:
IntPtr ptrIPAddress = IntPtr.Zero;
IntPtr ptrGUID = IntPtr.Zero;
ptrIPAddress =
Marshal.AllocHG lobal(Encoding. ASCII.GetByteCo unt(this.textBo xGGIPAIPAddress .Text));
ptrGUID =
Marshal.AllocHG lobal(Encoding. ASCII.GetByteCo unt(this.guidAp plicationGUID.T oString()));
ptrIPAddress = Marshal.StringT oHGlobalAnsi(th is.textBoxGGIPA IPAddress.Text) ;
ptrGUID = Marshal.StringT oHGlobalAnsi(th is.guidApplicat ionGUID.ToStrin g());
//(IntPtr,uint, IntPtr,IntPtr)
SendMessage(hWn d, (uint)WindowsMe ssages.WM_USER + 1111, ptrGUID ,
ptrIPAddress );
Marshal.FreeHGl obal(ptrIPAddre ss);
Marshal.FreeHGl obal(ptrGUID);
At the other end i try this, but nothing is in there:
protected override void WndProc(ref Message m)
{
if (m.Msg == (uint) WindowsAPIClass .WindowsMessage s.WM_USER + 1111)
{
String s = Marshal.PtrToSt ringAnsi(m.LPar am);
MessageBox.Show (s);
}
base.WndProc(re f m);
}
How to do this? I cant use remoting or stuff like that, because
the message should be available for any application running on
the System,...it seems that the global memory isnt really global,...
Regards
Kerem
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Beste Grüsse / Best regards / Votre bien devoue
Kerem Gümrükcü
Microsoft Live Space: http://kerem-g.spaces.live.com/
Latest Open-Source Projects: http://entwicklung.junetz.de
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