CreateFileMapping sharing memory between a service and an application

Hello,
I'm trying to share some data between a service and some applications.
The service always starts before any application.
First i created a memory file map with CreateFileMapping($FFFFFFFF,nil,PAGE_READWRITE,0,FSize,PChar(AName))
from the service and when i tried to access it with an application all i got was "access denied"
I've search the web and i found two solutions. First i populated the SecurityAttr like this:

SecurityAttr.nLength:=SizeOf(SECURITY_ATTRIBUTES);
SecurityAttr.bInheritHandle:=TRUE;
SecurityAttr.lpSecurityDescriptor:=@SecurityDescriptor;
InitializeSecurityDescriptor(@SecurityDescriptor,SECURITY_DESCRIPTOR_REVISION);
SetSecurityDescriptorDacl(@SecurityDescriptor,TRUE,NIL,FALSE);
SetKernelObjectSecurity(GetCurrentProcess,DACL_SECURITY_INFORMATION,@SecurityDescriptor);
CreateFileMapping($FFFFFFFF,@SecurityAttr,PAGE_READWRITE,0,FSize,PChar(AName))

. I'm only setting the SecurityAttr during the creation of the FileMapping.
When i access the FileMapping for read i leave the SecurityAttr as nil

No Access Denied messages but the memory map file is empty.

The second solution i found was SeCreateGlobalPrivilege. I tried setting this with AdjustTokenPrivileges and still nothing happened. Memory map is empty

I've also tried to set the name of the file mapping as Global\Mapname but still nothing.

When i try the code between two applications (and not between a service and an application), everything works and the memory file is populated