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DDE.CPP
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/*
** Command & Conquer(tm)
** Copyright 2025 Electronic Arts Inc.
**
** This program is free software: you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation, either version 3 of the License, or
** (at your option) any later version.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/***************************************************************************
** C O N F I D E N T I A L --- W E S T W O O D S T U D I O S **
***************************************************************************
* *
* Project Name : Dynamic Data Encapsulation *
* *
* File Name : DDE.CPP *
* *
* Programmer : Steve Wetherill *
* *
* Start Date : June 1, 1996 *
* *
* Last Update : June 8, 1996 [SW] *
* *
*-------------------------------------------------------------------------*
* Functions: *
* Instance_Class::InstanceClass -- class constructor *
* Instance_Class::InstanceClass -- class destructor *
* Instance_Class::Enable_Callback -- enables local processing of pokes *
* Instance_Class::Register_Servers -- registers a local DDE DNS service *
* Instance_Class::Cleanup_App -- currently does nothing *
* Instance_Class::Test_Server_Running -- does a trial connect to remote *
* Instance_Class::Open_Poke_Connection -- pokes some data to server *
* Instance_Class::Close_Poke_Connectionp -- closes connection to remote *
* Instance_Class::Poke_Server -- sends a chunk of data to remote *
* Instance_Class::dde_callback -- processes DDE transactions *
* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
#define WIN32
#include <windows.h>
#include "dde.h"
/***************************************************************************
* These are static members of Instance_Class
*=========================================================================*/
static DWORD Instance_Class::id_inst; // instance identifier set by DdeInitialize
static BOOL Instance_Class::process_pokes; // controls response to pokes
static char Instance_Class::ascii_name[32]; // name of server
static BOOL CALLBACK (*Instance_Class::callback) (
LPBYTE pointer, // pointer to received data
long length // length of received data or advisory flag
) = NULL;
/***************************************************************************
* Instance_Class::InstanceClass -- class constructor *
* *
* INPUT: *
* name1 null terminated ASCII client name *
* name1 null terminated ASCII server name *
* *
* OUTPUT: *
* dde_error = TRUE if error occurs when initializing DDE *
* *
* WARNINGS: *
* none. *
* *
* HISTORY: *
* 6/1/1996 SW : Created. *
*=========================================================================*/
Instance_Class::Instance_Class( LPSTR name1, LPSTR name2 )
{
dde_error = FALSE; // no errors
process_pokes = FALSE; // disable pokes in callback
id_inst = 0; // set to 0 for first time through
conv_handle = 0; // conversation handle reset
lstrcpy( ascii_name, name1 ); // keep a record of ASCII name
if ( DdeInitialize(
(LPDWORD) &id_inst, // instance identifier
dde_callback,
APPCLASS_STANDARD | // filter server messages
CBF_FAIL_SELFCONNECTIONS, // prevent from connecting with self
0) != DMLERR_NO_ERROR) { // reserved
dde_error = TRUE; // flag an error
}
local_name = DdeCreateStringHandle(
id_inst, // instance identifier
name1, // string to register
CP_WINANSI); // Windows ANSI code page
remote_name = DdeCreateStringHandle(
id_inst, // instance identifier
name2, // string to register
CP_WINANSI); // Windows ANSI code page
poke_topic = DdeCreateStringHandle(
id_inst, // instance identifier
"POKE TOPIC", // System topic
CP_WINANSI); // Windows ANSI code page
poke_item = DdeCreateStringHandle(
id_inst, // instance identifier
"POKE ITEM", // System topic
CP_WINANSI); // Windows ANSI code page
system_topic = DdeCreateStringHandle(
id_inst, // instance identifier
SZDDESYS_TOPIC, // System topic
CP_WINANSI); // Windows ANSI code page
}
/***************************************************************************
* Instance_Class::~Instance_Class -- class destructor *
* *
* INPUT: *
* none. *
* *
* OUTPUT: *
* none. *
* *
* WARNINGS: *
* none. *
* *
* HISTORY: *
* 6/1/1996 SW : Created. *
*=========================================================================*/
Instance_Class::~Instance_Class()
{
DdeUninitialize( id_inst );
}
/***************************************************************************
* Instance_Class::Enable_Callback -- enables user callback *
* *
* INPUT: *
* TRUE = enable poke processing *
* FALSE = disable poke processing *
* *
* OUTPUT: *
* echos the input *
* *
* WARNINGS: *
* user callback must be explicitly enabled. Disbabled by default. *
* *
* HISTORY: *
* 6/1/1996 SW : Created. *
*=========================================================================*/
BOOL Instance_Class::Enable_Callback( BOOL flag ) // enable or disable callback
{
return (process_pokes = flag);
}
/***************************************************************************
* Instance_Class::Register_Server -- registers a local DDE DNS service *
* *
* INPUT: *
* BOOL CALLBACK ( *callback_fnc) ( LPBYTE, DWORD) = user poke callbacl *
* *
* OUTPUT: *
* TRUE == success *
* FALSE == failed *
* *
* WARNINGS: *
* none. *
* *
* HISTORY: *
* 6/1/1996 SW : Created. *
*=========================================================================*/
BOOL Instance_Class::Register_Server( BOOL CALLBACK ( *callback_fnc) (LPBYTE, long) )
{
if (DdeNameService( id_inst, local_name, 0L, DNS_REGISTER ) != 0L) {
callback = callback_fnc;
return ( TRUE );
} else {
return ( FALSE );
}
}
/***************************************************************************
* Instance_Class::Test_Server_Running -- does a trial connect to remote *
* *
* INPUT: *
* name = HSZ string handle of server name. *
* *
* OUTPUT: *
* TRUE == successfully connected to remote *
* FALSE == failed to connect *
* *
* WARNINGS: *
* - Can be called for local or remote server but of course will *
* fail if a called for local and local server is not "up". *
* - Disconects before exiting. *
* *
* HISTORY: *
* 6/1/1996 SW : Created. *
*=========================================================================*/
BOOL Instance_Class::Test_Server_Running( HSZ name )
{
if( Open_Poke_Connection( name ) == TRUE) {
Close_Poke_Connection();
return( TRUE );
} else {
return( FALSE );
}
}
/***************************************************************************
* Instance_Class::Open_Poke_Connection -- open a connection to server *
* *
* INPUT: *
* name = HSZ server name. *
* *
* OUTPUT: *
* TRUE == successfully opened connection *
* FALSE == failed to connect *
* *
* WARNINGS: *
* Can be called for local or remote server but of course will *
* fail if a called for local and local server is not "up". *
* *
* HISTORY: *
* 6/1/1996 SW : Created. *
*=========================================================================*/
BOOL Instance_Class::Open_Poke_Connection( HSZ name )
{
conv_handle = DdeConnect(
id_inst, // instance identifier
name, // service name string handle
poke_topic, // topic string handle
(PCONVCONTEXT) NULL);// use default context
if (conv_handle == NULL) {
return FALSE;
} else {
return TRUE;
}
}
/***************************************************************************
* Instance_Class::Close_Poke_Connection -- closes poke connection *
* *
* INPUT: *
* none. *
* *
* OUTPUT: *
* TRUE == successfully closed connection *
* FALSE == failed to close connection for some reason *
* *
* WARNINGS: *
* none. *
* *
* HISTORY: *
* 6/1/1996 SW : Created. *
*=========================================================================*/
BOOL Instance_Class::Close_Poke_Connection( void )
{
if( conv_handle ) {
HCONV temp_handle = conv_handle;
conv_handle = NULL;
return( DdeDisconnect( temp_handle ));
} else {
return( TRUE );
}
}
/***************************************************************************
* Instance_Class::Poke_Server -- pokes some data to server *
* *
* INPUT: *
* poke_data points to data to send to remote *
* poke_length length of buffer to send *
* *
* OUTPUT: *
* TRUE == successfully poked the data *
* FALSE == failed to connect *
* *
* WARNINGS: *
* has a 3 second timeout (change POKE_TIMEOUT, in milliseconds) *
* *
* HISTORY: *
* 6/1/1996 SW : Created. *
*=========================================================================*/
#define POKE_TIMEOUT 60*1000 // 60 sec timeout
BOOL Instance_Class::Poke_Server( LPBYTE poke_data, DWORD poke_length )
{
if( DdeClientTransaction(
poke_data, // address of data to pass to server
poke_length, // length of data
conv_handle, // handle of conversation
poke_topic, // handle of item name string
CF_TEXT, // no special clipboard data format
XTYP_POKE, // transaction type
POKE_TIMEOUT, // time-out duration (millisecs)
(LPDWORD) NULL // address of transaction result (don't check)
) == 0) {
return( FALSE);
} else {
return( TRUE );
}
}
/***************************************************************************
* Instance_Class::dde_callback -- callback dde event handler *
* *
* INPUT: *
* dde_event transaction type *
* uFmt clipboard data format *
* hconv handle of the conversation *
* hsz1 handle of a string *
* hsz2 handle of a string *
* hdata handle of a global memory object *
* dwData1 transaction-specific data *
* dwData2 transaction-specific data *
* *
* OUTPUT: *
* context specific HDDEDATA object *
* *
* WARNINGS: *
* NOTE: declared as HDDEDATA CALLBACK which means PASCAL parameters *
* *
* HISTORY: *
* 6/1/1996 SW : Created. *
*=========================================================================*/
HDDEDATA CALLBACK Instance_Class::dde_callback(
UINT dde_event, // transaction type
UINT uFmt, // clipboard data format
HCONV , // handle of the conversation
HSZ hsz1, // handle of a string
HSZ hsz2, // handle of a string
HDDEDATA hdata, // handle of a global memory object
DWORD , // transaction-specific data
DWORD // transaction-specific data
)
{
if (!Instance_Class::callback){
return (HDDEDATA) NULL;
}
switch ( dde_event ) {
case XTYP_REGISTER:
case XTYP_UNREGISTER:
return (HDDEDATA) NULL;
case XTYP_ADVDATA:
return (HDDEDATA) DDE_FACK;
case XTYP_XACT_COMPLETE:
return (HDDEDATA) NULL;
case XTYP_DISCONNECT:
Instance_Class::callback( NULL, DDE_ADVISE_DISCONNECT);
return (HDDEDATA) NULL;
case XTYP_CONNECT: {
char buffer[32];
DdeQueryString (Instance_Class::id_inst, hsz2, buffer, sizeof (buffer), 0) ;
if (0 != strcmp (buffer, Instance_Class::ascii_name)) {
return (HDDEDATA) NULL;
}
DdeQueryString (Instance_Class::id_inst, hsz1, buffer, sizeof (buffer), 0) ;
if (0 != strcmp (buffer, "POKE TOPIC")) {
return (HDDEDATA) NULL;
}
Instance_Class::callback( NULL, DDE_ADVISE_CONNECT);
return (HDDEDATA) TRUE;
}
case XTYP_POKE:
if (Instance_Class::process_pokes == FALSE ) {
return (HDDEDATA) DDE_FNOTPROCESSED; // processing disabled
} else {
char buffer[32];
DdeQueryString (Instance_Class::id_inst, hsz1, buffer, sizeof (buffer), 0) ;
if (0 != strcmp (buffer, "POKE TOPIC")) {
return (HDDEDATA) DDE_FNOTPROCESSED;
} else if (uFmt == CF_TEXT) { // make sure it's CF_TEXT
BOOL processed;
BYTE FAR *pdata;
DWORD dw_length;
if ( (pdata = DdeAccessData( hdata, &dw_length)) == NULL ) {
return (HDDEDATA) DDE_FNOTPROCESSED;
}
processed = Instance_Class::callback((LPBYTE) pdata, dw_length);
DdeUnaccessData( hdata );
if (processed == TRUE) {
return (HDDEDATA) DDE_FACK;
} else {
return (HDDEDATA) NULL;
}
}
}
default:
return (HDDEDATA) NULL;
}
}