public unsafe bool Connect()
{
IntPtr hConv, hszService, hszTopic;
if (dwDDEInst != 0)
{
Ddeml.DdeUninitialize(dwDDEInst);
dwDDEInst = 0;
}
if (hconvCurrent != IntPtr.Zero)
{
Ddeml.DdeDisconnect(hconvCurrent);
hconvCurrent = IntPtr.Zero;
}
;
//如果是第一次，则什么也不做
Ddeml.DdeInitialize(ref dwDDEInst, _Callback, 0x3f000, 0);
// Connect to the server
hszTopic = Ddeml.DdeCreateStringHandle(dwDDEInst, _topic, Ddeml.CP_WINANSI);
hszService = Ddeml.DdeCreateStringHandle(dwDDEInst, _server, Ddeml.CP_WINANSI);
CONVCONTEXT cc = new CONVCONTEXT();
cc.cb = sizeof(CONVCONTEXT);
hConv = Ddeml.DdeConnect(dwDDEInst, hszService, hszTopic, ref cc);
//int DdeErrcode = Win32.DdeGetLastError(dwDDEInst);
Ddeml.DdeFreeStringHandle(dwDDEInst, hszTopic);
Ddeml.DdeFreeStringHandle(dwDDEInst, hszService);
if (hConv != IntPtr.Zero)
{
if (hconvCurrent != IntPtr.Zero)
{
Ddeml.DdeDisconnect(hconvCurrent);
}
hconvCurrent = hConv;
_connected = true;
return(true);
}
else
{
_connected = false;
return(false);
}
}
protected virtual bool OnConnect(string topic, CONVCONTEXT context, bool sameInstance)
{
return(true);
}
public static extern IntPtr DdeConnectList(int idInst, IntPtr hszService, IntPtr hszTopic, IntPtr hConvList, ref CONVCONTEXT pCC);