public bool PreFilterTransaction(DdemlTransaction t) { if (t.uType == Ddeml.XTYP_MONITOR) { switch (t.dwData2.ToInt32()) { case Ddeml.MF_CALLBACKS: { // Get the MONCBSTRUCT object. int length = 0; IntPtr phData = Ddeml.DdeAccessData(t.hData, ref length); Ddeml.MONCBSTRUCT mon = (Ddeml.MONCBSTRUCT)Marshal.PtrToStructure(phData, typeof(Ddeml.MONCBSTRUCT)); Ddeml.DdeUnaccessData(t.hData); _Parent.OnCallback(mon); break; } case Ddeml.MF_CONV: { // Get the MONCONVSTRUCT object. int length = 0; IntPtr phData = Ddeml.DdeAccessData(t.hData, ref length); Ddeml.MONCONVSTRUCT mon = (Ddeml.MONCONVSTRUCT)Marshal.PtrToStructure(phData, typeof(Ddeml.MONCONVSTRUCT)); Ddeml.DdeUnaccessData(t.hData); _Parent.OnConversation(mon); break; } case Ddeml.MF_ERRORS: { // Get the MONERRSTRUCT object. int length = 0; IntPtr phData = Ddeml.DdeAccessData(t.hData, ref length); Ddeml.MONERRSTRUCT mon = (Ddeml.MONERRSTRUCT)Marshal.PtrToStructure(phData, typeof(Ddeml.MONERRSTRUCT)); Ddeml.DdeUnaccessData(t.hData); _Parent.OnError(mon); break; } case Ddeml.MF_HSZ_INFO: { // Get the MONHSZSTRUCT object. int length = 0; IntPtr phData = Ddeml.DdeAccessData(t.hData, ref length); Ddeml.MONHSZSTRUCT mon = (Ddeml.MONHSZSTRUCT)Marshal.PtrToStructure(phData, typeof(Ddeml.MONHSZSTRUCT)); Ddeml.DdeUnaccessData(t.hData); _Parent.OnString(mon); break; } case Ddeml.MF_LINKS: { // Get the MONLINKSTRUCT object. int length = 0; IntPtr phData = Ddeml.DdeAccessData(t.hData, ref length); Ddeml.MONLINKSTRUCT mon = (Ddeml.MONLINKSTRUCT)Marshal.PtrToStructure(phData, typeof(Ddeml.MONLINKSTRUCT)); Ddeml.DdeUnaccessData(t.hData); _Parent.OnLink(mon); break; } case Ddeml.MF_POSTMSGS: { // Get the MONMSGSTRUCT object. int length = 0; IntPtr phData = Ddeml.DdeAccessData(t.hData, ref length); Ddeml.MONMSGSTRUCT mon = (Ddeml.MONMSGSTRUCT)Marshal.PtrToStructure(phData, typeof(Ddeml.MONMSGSTRUCT)); Ddeml.DdeUnaccessData(t.hData); _Parent.OnPost(mon); break; } case Ddeml.MF_SENDMSGS: { // Get the MONMSGSTRUCT object. int length = 0; IntPtr phData = Ddeml.DdeAccessData(t.hData, ref length); Ddeml.MONMSGSTRUCT mon = (Ddeml.MONMSGSTRUCT)Marshal.PtrToStructure(phData, typeof(Ddeml.MONMSGSTRUCT)); Ddeml.DdeUnaccessData(t.hData); _Parent.OnSend(mon); break; } } } return true; }