private IntPtr OnDdeCallback(int uType, ConversionFormat uFmt, IntPtr hConv, IntPtr hsz1, IntPtr hsz2, IntPtr hData, uint dwData1, uint dwData2)
{
// Create a new transaction object that will be dispatched to a DdemlClient, DdemlServer, or ITransactionFilter.
// Dispatch the transaction.
switch (uType)
{
case Ddeml.XTYP_MONITOR:
switch (dwData2)
{
case Ddeml.MF_CALLBACKS:
{
// Get the MONCBSTRUCT object.
int length = 0;
IntPtr phData = Ddeml.DdeAccessData(hData, ref length);
MONCBSTRUCT mon = (MONCBSTRUCT)Marshal.PtrToStructure(phData, typeof(MONCBSTRUCT));
Ddeml.DdeUnaccessData(hData);
OnCallback(mon);
return(IntPtr.Zero);
}
case Ddeml.MF_CONV:
{
// Get the MONCONVSTRUCT object.
int length = 0;
IntPtr phData = Ddeml.DdeAccessData(hData, ref length);
MONCONVSTRUCT mon = (MONCONVSTRUCT)Marshal.PtrToStructure(phData, typeof(MONCONVSTRUCT));
Ddeml.DdeUnaccessData(hData);
OnConversation(mon);
return(IntPtr.Zero);
}
case Ddeml.MF_ERRORS:
{
// Get the MONERRSTRUCT object.
int length = 0;
IntPtr phData = Ddeml.DdeAccessData(hData, ref length);
MONERRSTRUCT mon = (MONERRSTRUCT)Marshal.PtrToStructure(phData, typeof(MONERRSTRUCT));
Ddeml.DdeUnaccessData(hData);
OnError(mon);
return(IntPtr.Zero);
}
case Ddeml.MF_HSZ_INFO:
{
// Get the MONHSZSTRUCT object.
int length = 0;
IntPtr phData = Ddeml.DdeAccessData(hData, ref length);
MONHSZSTRUCT mon = (MONHSZSTRUCT)Marshal.PtrToStructure(phData, typeof(MONHSZSTRUCT));
Ddeml.DdeUnaccessData(hData);
OnString(mon);
return(IntPtr.Zero);
}
case Ddeml.MF_LINKS:
{
// Get the MONLINKSTRUCT object.
int length = 0;
IntPtr phData = Ddeml.DdeAccessData(hData, ref length);
MONLINKSTRUCT mon = (MONLINKSTRUCT)Marshal.PtrToStructure(phData, typeof(MONLINKSTRUCT));
Ddeml.DdeUnaccessData(hData);
OnLink(mon);
return(IntPtr.Zero);
}
case Ddeml.MF_POSTMSGS:
{
// Get the MONMSGSTRUCT object.
int length = 0;
IntPtr phData = Ddeml.DdeAccessData(hData, ref length);
MONMSGSTRUCT mon = (MONMSGSTRUCT)Marshal.PtrToStructure(phData, typeof(MONMSGSTRUCT));
Ddeml.DdeUnaccessData(hData);
OnPost(mon);
return(IntPtr.Zero);
}
case Ddeml.MF_SENDMSGS:
{
// Get the MONMSGSTRUCT object.
int length = 0;
IntPtr phData = Ddeml.DdeAccessData(hData, ref length);
MONMSGSTRUCT mon = (MONMSGSTRUCT)Marshal.PtrToStructure(phData, typeof(MONMSGSTRUCT));
Ddeml.DdeUnaccessData(hData);
OnSend(mon);
return(IntPtr.Zero);
}
}
break;
case Ddeml.XTYP_ADVDATA:
unsafe
{
sbyte *pSZ = stackalloc sbyte[Ddeml.MAX_STRING_SIZE];
int len = Ddeml.DdeQueryString(_InstanceId, hsz1, pSZ, Ddeml.MAX_STRING_SIZE, Ddeml.CP_WINANSI);
string topic = new string(pSZ);
len = Ddeml.DdeQueryString(_InstanceId, hsz2, pSZ, Ddeml.MAX_STRING_SIZE, Ddeml.CP_WINANSI);
string item = new string(pSZ);
byte * bt = stackalloc byte[Ddeml.MAX_STRING_SIZE];
len = Ddeml.DdeGetData(hData, bt, Ddeml.MAX_STRING_SIZE, 0);
byte[] bytes = new byte[len]; for (int i = 0; i < len; i++)
{
bytes[i] = *bt++;
}
;
if (hData != IntPtr.Zero)
{
Ddeml.DdeUnaccessData(hData);
}
return(new IntPtr((int)OnAdvData(uFmt, topic, item, bytes)));
}
case Ddeml.XTYP_ADVREQ:
unsafe
{
sbyte *pSZ = stackalloc sbyte[Ddeml.MAX_STRING_SIZE];
int len = Ddeml.DdeQueryString(_InstanceId, hsz1, pSZ, Ddeml.MAX_STRING_SIZE, Ddeml.CP_WINANSI);
string topic = new string(pSZ);
len = Ddeml.DdeQueryString(_InstanceId, hsz2, pSZ, Ddeml.MAX_STRING_SIZE, Ddeml.CP_WINANSI);
string item = new string(pSZ);
byte[] data = OnAdvReq(uFmt, topic, item);
// Create and return the data handle representing the data being advised.
if (data != null && data.Length > 0)
{
return(Ddeml.DdeCreateDataHandle(_InstanceId, data, data.Length, 0, hsz2, uFmt, 0));;
}
// This transaction could not be Ddeml.DDE_FACK here.
return(IntPtr.Zero);
}
case Ddeml.XTYP_ADVSTART:
unsafe
{
// Get the item name from the hsz2 string handle.
sbyte *pSZ = stackalloc sbyte[Ddeml.MAX_STRING_SIZE];
int len = Ddeml.DdeQueryString(_InstanceId, hsz1, pSZ, Ddeml.MAX_STRING_SIZE, Ddeml.CP_WINANSI);
string topic = new string(pSZ);
len = Ddeml.DdeQueryString(_InstanceId, hsz2, pSZ, Ddeml.MAX_STRING_SIZE, Ddeml.CP_WINANSI);
string item = new string(pSZ);
// Get a value indicating whether an advise loop should be initiated from the subclass.
//AdvStart(hConv, item, uFmt, Ddeml.XTYPF_ACKREQ);
return(OnAdvStart(uFmt, topic, item) ? new IntPtr(1) : IntPtr.Zero);
}
case Ddeml.XTYP_ADVSTOP:
unsafe
{
// Get the item name from the hsz2 string handle.
sbyte *pSZ = stackalloc sbyte[Ddeml.MAX_STRING_SIZE];
int len = Ddeml.DdeQueryString(_InstanceId, hsz1, pSZ, Ddeml.MAX_STRING_SIZE, Ddeml.CP_WINANSI);
string topic = new string(pSZ);
len = Ddeml.DdeQueryString(_InstanceId, hsz2, pSZ, Ddeml.MAX_STRING_SIZE, Ddeml.CP_WINANSI);
string item = new string(pSZ);
// Inform the subclass that the advise loop has been terminated.
//AdvStop(hConv, item, uFmt);
OnAdvStop(uFmt, topic, item);
break;
}
case Ddeml.XTYP_CONNECT:
unsafe
{
sbyte *pSZ = stackalloc sbyte[Ddeml.MAX_STRING_SIZE];
int len = Ddeml.DdeQueryString(_InstanceId, hsz1, pSZ, Ddeml.MAX_STRING_SIZE, Ddeml.CP_WINANSI);
string topic = new string(pSZ);
// Get a value from the subclass indicating whether the connection should be allowed.
return(OnConnect(topic, new CONVCONTEXT(), true) ? new IntPtr(1) : IntPtr.Zero);
}
case Ddeml.XTYP_CONNECT_CONFIRM:
unsafe
{
sbyte *pSZ = stackalloc sbyte[Ddeml.MAX_STRING_SIZE];
int len = Ddeml.DdeQueryString(_InstanceId, hsz1, pSZ, Ddeml.MAX_STRING_SIZE, Ddeml.CP_WINANSI);
string topic = new string(pSZ);
// Create a Conversation object and add it to the hConv table.
_ConversationTable.Add(hConv);
// Inform the subclass that a hConv has been established.
OnConnectConfirm(topic, true);
break;
}
case Ddeml.XTYP_DISCONNECT:
{
// Remove the Conversation from the hConv table.
_ConversationTable.Remove(hConv);
// Inform the subclass that the hConv has been disconnected.
OnDisconnect(true);
// Return zero to indicate that there are no problems.
return(IntPtr.Zero);
}
case Ddeml.XTYP_EXECUTE:
unsafe
{
// Get the command from the data handle.
sbyte *pSZ = stackalloc sbyte[Ddeml.MAX_STRING_SIZE];
int len = Ddeml.DdeQueryString(_InstanceId, hsz1, pSZ, Ddeml.MAX_STRING_SIZE, Ddeml.CP_WINANSI);
string topic = new string(pSZ);
byte * bt = stackalloc byte[Ddeml.MAX_STRING_SIZE];
len = Ddeml.DdeGetData(hData, bt, Ddeml.MAX_STRING_SIZE, 0);
string command = new string((sbyte *)bt);
// Send the command to the subclass and get the resul
return(new IntPtr((int)OnExecute(topic, command.TrimEnd('\0'))));
}
case Ddeml.XTYP_POKE:
unsafe
{
// Get the item name from the hsz2 string handle.
sbyte *pSZ = stackalloc sbyte[Ddeml.MAX_STRING_SIZE];
int len = Ddeml.DdeQueryString(_InstanceId, hsz1, pSZ, Ddeml.MAX_STRING_SIZE, Ddeml.CP_WINANSI);
string topic = new string(pSZ);
len = Ddeml.DdeQueryString(_InstanceId, hsz2, pSZ, Ddeml.MAX_STRING_SIZE, Ddeml.CP_WINANSI);
string item = new string(pSZ);
byte * bt = stackalloc byte[Ddeml.MAX_STRING_SIZE];
len = Ddeml.DdeGetData(hData, bt, Ddeml.MAX_STRING_SIZE, 0);
byte[] data = new byte[len]; for (int i = 0; i < len; i++)
{
data[i] = *bt++;
}
;
// Send the data to the subclass and get the resul
return(new IntPtr((int)OnPoke(uFmt, topic, item, data)));
}
case Ddeml.XTYP_REQUEST:
unsafe
{
// Get the item name from the hsz2 string handle.
sbyte *pSZ = stackalloc sbyte[Ddeml.MAX_STRING_SIZE];
int len = Ddeml.DdeQueryString(_InstanceId, hsz1, pSZ, Ddeml.MAX_STRING_SIZE, Ddeml.CP_WINANSI);
string topic = new string(pSZ);
len = Ddeml.DdeQueryString(_InstanceId, hsz2, pSZ, Ddeml.MAX_STRING_SIZE, Ddeml.CP_WINANSI);
string item = new string(pSZ);
// Send the request to the subclass and get the resul
var result = OnRequest(uFmt, topic, item);
// Return a data handle if the subclass Ddeml.DDE_FACK the request successfully.
if (result != null)
{
return(Ddeml.DdeCreateDataHandle(_InstanceId, result, result.Length, 0, hsz2, uFmt, 0));
}
// Return DDE_FDdeml.DDE_FNOTDdeml.DDE_FACK if the subclass did not process the command.
return(new IntPtr(Ddeml.DDE_FNOTPROCESSED));
}
case Ddeml.XTYP_XACT_COMPLETE:
unsafe
{
sbyte *pSZ = stackalloc sbyte[Ddeml.MAX_STRING_SIZE];
int len = Ddeml.DdeQueryString(_InstanceId, hsz1, pSZ, Ddeml.MAX_STRING_SIZE, Ddeml.CP_WINANSI);
string topic = new string(pSZ);
len = Ddeml.DdeQueryString(_InstanceId, hsz2, pSZ, Ddeml.MAX_STRING_SIZE, Ddeml.CP_WINANSI);
string item = new string(pSZ);
OnXactComplete(uFmt, topic, item, hData, dwData1);
break;
}
case Ddeml.XTYP_WILDCONNECT:
{
// This library does not support wild connects.
return(IntPtr.Zero);
}
case Ddeml.XTYP_ERROR:
{
// Get the error code, but do nothing with it at this time.
return(IntPtr.Zero);
}
case Ddeml.XTYP_REGISTER:
unsafe
{
// Get the service name from the hsz1 string handle.
sbyte *pSZ = stackalloc sbyte[Ddeml.MAX_STRING_SIZE];
int len = Ddeml.DdeQueryString(_InstanceId, hsz1, pSZ, Ddeml.MAX_STRING_SIZE, Ddeml.CP_WINANSI);
string bas = new string(pSZ);
len = Ddeml.DdeQueryString(_InstanceId, hsz2, pSZ, Ddeml.MAX_STRING_SIZE, Ddeml.CP_WINANSI);
string inst = new string(pSZ);
OnRegister(bas, inst);
return(IntPtr.Zero);
}
case Ddeml.XTYP_UNREGISTER:
unsafe
{
sbyte *pSZ = stackalloc sbyte[Ddeml.MAX_STRING_SIZE];
int len = Ddeml.DdeQueryString(_InstanceId, hsz1, pSZ, Ddeml.MAX_STRING_SIZE, Ddeml.CP_WINANSI);
string bas = new string(pSZ);
len = Ddeml.DdeQueryString(_InstanceId, hsz2, pSZ, Ddeml.MAX_STRING_SIZE, Ddeml.CP_WINANSI);
string inst = new string(pSZ);
OnUnRegister(bas, inst);
return(IntPtr.Zero);
}
}
return(IntPtr.Zero);
}