// https://msdn.microsoft.com/en-us/library/ms648742%28v=VS.85%29.aspx?f=255&MSPPError=-2147217396
private IntPtr DdeCallback(uint uType, uint uFmt, IntPtr hconv, IntPtr hsz1, IntPtr hsz2, IntPtr hdata, UIntPtr dwData1, UIntPtr dwData2)
{
DDEMsgType type = (DDEMsgType)uType;
switch (type)
{
case DDEMsgType.XTYP_REGISTER:
System.Diagnostics.Debug.WriteLine("DDE Register");
break;
case DDEMsgType.XTYP_CONNECT:
{
foreach (var t in TopicHandles)
{
bool isValid = (NativeMethods.DdeCmpStringHandles(hsz1, t) == 0 &&
NativeMethods.DdeCmpStringHandles(hsz2, ServerNameHandle) == 0);
if (isValid)
{
return(new IntPtr(1));
}
}
return(new IntPtr(0));
}
case DDEMsgType.XTYP_CONNECT_CONFIRM:
System.Diagnostics.Debug.WriteLine("DDE Connect confirm");
break;
case DDEMsgType.XTYP_EXECUTE:
{
for (int i = 0; i < TopicHandles.Count; i++)
{
if (hsz1 == TopicHandles[i])
{
System.Diagnostics.Debug.WriteLine("DDE Execute");
TopicActions[i].Invoke(hdata); // only hdata is of interest https://docs.microsoft.com/en-us/windows/win32/dataxchg/xtyp-execute
break;
}
}
return(new IntPtr((int)DdeResult.DDE_FACK));
}
case DDEMsgType.XTYP_DISCONNECT:
System.Diagnostics.Debug.WriteLine("DDE Disconnect");
break;
default:
System.Diagnostics.Debug.WriteLine($"DDE Unknown {uType:X}");
break;
}
return(IntPtr.Zero);
}
// https://msdn.microsoft.com/en-us/library/ms648742%28v=VS.85%29.aspx?f=255&MSPPError=-2147217396
private IntPtr DdeCallback(uint uType, uint uFmt, IntPtr hconv, IntPtr hsz1, IntPtr hsz2, IntPtr hdata, UIntPtr dwData1, UIntPtr dwData2)
{
DDEMsgType type = (DDEMsgType)uType;
switch (type)
{
case DDEMsgType.XTYP_CONNECT:
bool isValid = (NativeMethods.DdeCmpStringHandles(hsz1, TopicHandle) == 0 &&
NativeMethods.DdeCmpStringHandles(hsz2, ServerNameHandle) == 0);
return(new IntPtr(isValid ? 1 : 0));
case DDEMsgType.XTYP_EXECUTE:
string url = FromDdeStringHandle(hdata);
urlHandler?.Invoke(url);
return(new IntPtr((int)DdeResult.DDE_FACK));
default:
break;
}
return(IntPtr.Zero);
}