129 lines
5 KiB
C
129 lines
5 KiB
C
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/***************************************************************************/
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/** Microsoft Windows **/
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/** Copyright(c) Microsoft Corp., 1991, 1992 **/
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/***************************************************************************/
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/****************************************************************************
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dde.h
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Aug 92, JimH
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Header file for DDE objects (DDEClient, and DDEServer.) DDE is not meant to
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be instantiated directly.
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Class DDE
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This superclass requires both a server name and a topic name for which
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it creates and destroys string handles. Servers technically do not
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need the topic name to instantiate, but they generally need at least
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one to do useful things, so it is provided here. Clients require the
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topic name to connect. DDE also requires a dde callback function pointer.
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Type DDECALLBACK is defined for this purpose.
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DDE provides a convenient way to retrieve dde data from within
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callback functions, especially string data in CString objects via
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GetDataString(hData). Structures can also be retrieved, but in that
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case memory must be allocated prior to the GetData() call.
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Some built-in methods return a BOOL to determine success. Others (like
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the constructor) cannot, so use GetResult() for current status. If it
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is FALSE, GetLastError() can be useful.
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Class DDEServer : DDE
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This is a very simple extension. The contructor registers the server
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name and the destructor unregisters it. Most of the work for DDEML
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servers is done in the server callback function, not here.
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Class DDEClient : DDE
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This is used to instantiate a client-only DDE object. New methods
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request new data (RequestString) set up hot links (StartAdviseLoop)
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and send unsolicited data (Poke.)
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****************************************************************************/
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#ifndef DDE_INC
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#define DDE_INC
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#include <ddeml.h>
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typedef HDDEDATA (EXPENTRY *DDECALLBACK) (WORD, WORD, HCONV, HSZ, HSZ, HDDEDATA, DWORD, DWORD);
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HDDEDATA EXPENTRY EXPORT DdeServerCallBack(WORD, WORD, HCONV, HSZ, HSZ, HDDEDATA, DWORD, DWORD);
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HDDEDATA EXPENTRY EXPORT DdeClientCallBack(WORD, WORD, HCONV, HSZ, HSZ, HDDEDATA, DWORD, DWORD);
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class DDE
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{
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public:
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DDE(const TCHAR *server, const TCHAR *topic, DDECALLBACK CallBack,
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DWORD filters = APPCLASS_STANDARD);
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virtual ~DDE();
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HDDEDATA CreateDataHandle(void FAR *pdata, DWORD size, HSZ hItem);
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HSZ CreateStrHandle(LPCTSTR str, int codepage = CP_WINANSI);
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void DestroyStrHandle(HSZ hsz);
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PBYTE GetData(HDDEDATA hData, PBYTE pdata, DWORD len = 0);
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CString GetDataString(HDDEDATA hData = NULL);
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WORD GetInitError() { return m_initerr; }
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UINT GetLastError() { return ::DdeGetLastError(m_idInst); }
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BOOL GetResult() { return m_bResult; }
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CString GetServer() { return m_server; }
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CString GetTopic() { return m_topic; }
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BOOL SetCallBack(DDECALLBACK CallBack);
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void SetFilters(DWORD filters) { m_filters = filters; }
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private:
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BOOL Initialize(void);
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DDECALLBACK m_CallBack;
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DWORD m_filters; // filters passed to ::DdeInitialize()
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WORD m_initerr; // return error from ::DdeInitialize()
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protected:
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DWORD m_idInst; // instance id from ::DdeInitialize()
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BOOL m_bResult; // current state of object
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CString m_data; // last string acquired from GetDataString()
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CString m_server, m_topic; // server and topic names
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HSZ m_hServer, m_hTopic;
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};
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class DDEServer : public DDE
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{
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public:
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DDEServer(const TCHAR *server, const TCHAR *topic,
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DDECALLBACK ServerCallBack,
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DWORD filters = APPCLASS_STANDARD);
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~DDEServer(void);
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BOOL PostAdvise(HSZ hItem);
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};
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class DDEClient : public DDE
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{
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public:
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DDEClient(const TCHAR *server, const TCHAR *topic,
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DDECALLBACK ClientCallBack,
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DWORD filters = APPCMD_CLIENTONLY | CBF_FAIL_SELFCONNECTIONS);
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~DDEClient(void);
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BOOL Poke(HSZ hItem, const TCHAR *string, DWORD uTimeout = NULL);
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BOOL Poke(HSZ hItem, void FAR *pdata, DWORD len,
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DWORD uTimeout = NULL);
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void SetTimeOut(DWORD timeout) { m_timeout = timeout; }
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HDDEDATA RequestData(HSZ hItem, DWORD uTimeout = NULL);
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BOOL RequestString(HSZ hItem, DWORD uTimeout = NULL);
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BOOL StartAdviseLoop(HSZ hItem);
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private:
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HDDEDATA ClientTransaction(void FAR *lpvData, DWORD cbData, HSZ hItem,
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UINT uType, UINT uFmt = CF_TEXT);
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HCONV m_hConv; // conversation handle from ::DdeConnect()
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DWORD m_timeout; // timeout used in ::DdeClientTransaction()
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DWORD m_deftimeout; // default timeout
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};
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extern DDEClient *ddeClient;
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extern DDEServer *ddeServer;
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#endif
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