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| // This file defines a DLL, which exports procedures for DDE client connections
// to server applications.
// The base of the procedures are several articles from Mircosoft about DDE and
// different examples of code found via internet search. The code examples did
// not work in Visual Studio .NET 2003 and had to be revised substantially.
//
// Author: Robert Matovinovic
// Version: 0.03
// Date: 14.10.2006
//
// 0.01
// DLL supports only a single connection. For multiple connections the variables
// must be localized to procedures. Synchronous and asynchronous transactions are
// possible. To access data of asynchronous transactions call
// DCAsynchTransactionCompleted
//
// 0.02
// multiple connections realized by use of individual conversation handle and
// separated variables
//
// 0.03
// bug fixed which caused an infinite loop in DCAsynchTransactionCompleted
// DDEClient.cpp : Entry point for DLL application.
//
#pragma once
#define WIN32_LEAN_AND_MEAN // don't bind to seldom used parts of Windows-Header
#include <windows.h>
#include <ddeml.h>
#include <atlstr.h> // only for string handling of error messages
#include "DCErrors.h" // Error messages for dll
#include <fstream>
using namespace std;
//
// global data
//
char szVersion[]="DDEClient.dll, version 0.03, copyright Robert Matovinovic, robert.matovinovic@web.de";
// variable of DDE instance
DWORD dwDDEInst = 0;
// data handle for execute transaction
HDDEDATA hExecData;
// string for messages
CString csMsg;
// Flag for successful return of callback function
bool bCbSuccess = true;
// DDEClientTransaction data, variables for transactions via DDEML
typedef struct {
// Pointer to the beginning of the data the client must pass to the server.
// can also be a data handle, for execute and poke.
LPBYTE pData;
// Specifies the length, in bytes, of the data pointed to by the pData parameter
DWORD cbData;
// Handle to the conversation in which the transaction is to take place.
HCONV hConv;
// Handle to the data item for which data is being
// exchanged during the transaction.
HSZ hszItem;
// Specifies the standard clipboard format
// in which the data item is being submitted or requested.
UINT wFmt;
// Specifies the transaction type.
UINT wType;
// Specifies the maximum length of time, in milliseconds, that the client will
// wait for a response from the server application in a synchronous transaction.
// This parameter should be TIMEOUT_ASYNC for asynchronous transactions.
DWORD dwTimeout;
// Pointer to a variable that receives the result of the transaction.
//LPDWORD pdwResult;
// Variable that receives the result of the transaction.
DWORD dwResult;
// Data handle for transactions
HDDEDATA hData;
} DDEVARS;
// DDE data structure for access data received by DDE transaction
typedef struct {
// pointer to begin of dde data returned by DdeAccessData
BYTE* pData;
// length of dde data returned by DdeAccessData
DWORD dwLen;
// string pointer to dde data, if the data should accessed as string
char* pszData;
// ID of transaction, used to determine completion of asynchronous transaction
DWORD dwTransID;
// ID of transaction, returned by callback function with asynch. transaction
DWORD dwCbTransID;
// string for access type of data
char szAccType[6];
} DCDATAACCESS;
// maximal number of dde conversations
const WORD wCONVMAX = 20;
// pointer array to dde conversation variables
DDEVARS* DdeV[wCONVMAX];
// pointer array to dde data access variables
DCDATAACCESS* DDA[wCONVMAX];
#define DllExport extern "C" __declspec( dllexport )
//
// exported variables
//
// boolean used by DCLastError for appearance of error messages.
// false: Messages are shown in a system message box.
// true: Messages are passed to the calling program.
DllExport bool bDCErrorExport = false;
// pointer to an pointer array to dde data access variables
DllExport DCDATAACCESS* *DCDA = DDA;
//
// exported functions
//
DllExport bool DCRequestString (WORD wC, char szItem[], DWORD dwTimeout);
DllExport bool DCRequest(WORD wC, char szItem[], char szFormat[], DWORD dwTimeout );
DllExport bool DCTransaction (WORD wC, char szType[], char szItem[], char szData[], char szFormat[], DWORD dwTimeout, char szAccess[]);
DllExport bool DCInit();
DllExport bool DCConnect(WORD* pConvNo, char* szService, char* szTopic);
DllExport bool DCDisconnect(WORD wC);
DllExport bool DCUninit();
DllExport bool DCFreeDdeMem(WORD wC);
DllExport char* DCLastError();
DllExport void DCFinalize();
DllExport bool DCAsynchTransactionCompleted(WORD wC, DWORD dwTransID, bool bWait);
DllExport bool DCAbandonTransaction(WORD wC, DWORD dwTransID);
DllExport char* DCVersion();
//
// forward declarations
//
bool DdeDataHandling(WORD wC, HDDEDATA hData, char szAccess[]);
void FreeData(WORD wC);
bool InitDdeVars(HCONV hConv);
bool InitDCDataAccess(WORD wC);
WORD FindConvNo(HCONV hConv);
bool GetConvNo(WORD* pConvNo);
void FreeDdeV(WORD wC);
void FreeDDA(WORD wC);
//
// Entry point for application
//
BOOL APIENTRY DllMain( HANDLE hModule,
DWORD ul_reason_for_call,
LPVOID lpReserved
)
{
//hMod = hModule; // save our module handle
//InitDdeVars(0L);
//InitDCDataAccess();
return true;
}
//
// local functions
//
void FAR PASCAL WEP(WORD wGarbage)
{
//
// Do absolutely nothing at all here, since
// that's all that is safe to do.
//
}
// procedure which retrives the last DDE error and adds it to a CString
UINT DCGetLastError(DWORD dwDdeInst, CString csMsgHead)
{
UINT ui;
csMsg=csMsgHead;
ui = DdeGetLastError(dwDdeInst);
if (ui != DMLERR_NO_ERROR)
{
switch (ui)
{
case DMLERR_ADVACKTIMEOUT:
csMsg = csMsg + (CString)ccDMLERR01;
break;
case DMLERR_BUSY:
csMsg = csMsg + (CString)ccDMLERR02;
break;
case DMLERR_DATAACKTIMEOUT:
csMsg = csMsg + (CString)ccDMLERR03;
break;
case DMLERR_DLL_NOT_INITIALIZED:
csMsg = csMsg + (CString)ccDMLERR04;
break;
case DMLERR_DLL_USAGE:
csMsg = csMsg + (CString)ccDMLERR05;
break;
case DMLERR_EXECACKTIMEOUT:
csMsg = csMsg + (CString)ccDMLERR06;
break;
case DMLERR_INVALIDPARAMETER:
csMsg = csMsg + (CString)ccDMLERR07;
break;
case DMLERR_LOW_MEMORY:
csMsg = csMsg + (CString)ccDMLERR08;
break;
case DMLERR_MEMORY_ERROR:
csMsg = csMsg + (CString)ccDMLERR09;
break;
case DMLERR_NO_CONV_ESTABLISHED:
csMsg = csMsg + (CString)ccDMLERR10;
break;
case DMLERR_NOTPROCESSED:
csMsg = csMsg + (CString)ccDMLERR11;
break;
case DMLERR_POKEACKTIMEOUT:
csMsg = csMsg + (CString)ccDMLERR12;
break;
case DMLERR_POSTMSG_FAILED:
csMsg = csMsg + (CString)ccDMLERR13;
break;
case DMLERR_REENTRANCY:
csMsg = csMsg + (CString)ccDMLERR14;
break;
case DMLERR_SERVER_DIED:
csMsg = csMsg + (CString)ccDMLERR15;
break;
case DMLERR_SYS_ERROR:
csMsg = csMsg + (CString)ccDMLERR16;
break;
case DMLERR_UNADVACKTIMEOUT:
csMsg = csMsg + (CString)ccDMLERR17;
break;
case DMLERR_UNFOUND_QUEUE_ID:
csMsg = csMsg + (CString)ccDMLERR18;
break;
}
}
return ui;
}
//
// Callback function for DDE messages
//
HDDEDATA CALLBACK DdeCallback(UINT wType,
UINT wFmt,
HCONV hConv,
HSZ hsz1,
HSZ hsz2,
HDDEDATA hDDEData,
DWORD dwData1,
DWORD dwData2)
{
bool bErrorExport;
WORD wC;
bCbSuccess = true;
wC = FindConvNo(hConv);
if (wType == XTYP_ADVDATA ) {
DDA[wC]->dwCbTransID = dwData1;
//DdeDataString(wC,hDDEData);
//char* pszDdeData = (char *) DdeAccessData(hDDEData, &DDA[wC]->dwLen);
char pszDdeData[255];
DdeGetData(hDDEData, (unsigned char *)pszDdeData, 255, 0);
ofstream fichier("DDEDLL.txt", ios::out | ios::trunc); // ouverture en écriture avec effacement du fichier ouvert
if(fichier)
{
fichier << "DDEadvise: " << pszDdeData << endl;
fichier.close();
}
}
switch ( wType )
{
case XTYP_XACT_COMPLETE:
// store transaction ID
DDA[wC]->dwCbTransID = dwData1;
// Return doing nothing, if the transaction IDs are not equal
if ( dwData1 != DdeV[wC]->dwResult )
{
csMsg = ccMsgCbWrongID;
bCbSuccess = false;
return 0;
}
// Check for successful transaction
if ( !hDDEData )
{
csMsg = ccMsgCbTransactionFailed;
bCbSuccess = false;
}
// access DDE data for request transactions
else if ( DdeV[wC]->wType == XTYP_REQUEST )
{
if(!DdeDataHandling(wC, hDDEData, DDA[wC]->szAccType))
{
FreeData(wC);
csMsg = ccMsgCbAsynchRequestFailed;
bCbSuccess = false;
}
}
else bCbSuccess = true;
// do nothing for execute and poke transactions
DdeV[wC]->dwResult = 0;
//char szTemp[100];
//sprintf(szTemp,"bCbSuccess = %i CbTransID = %i", bCbSuccess,DDA[wC]->dwCbTransID);
////MessageBox((HWND)GetActiveWindow(), szTemp, ccMsgCaptionCb, MB_OK);
return 0;
case XTYP_DISCONNECT:
DdeV[wC]->dwResult = 0;
//MessageBox((HWND)GetActiveWindow(), ccMsgAppTerminatedConv, ccMsgCaptionCb, MB_OK | MB_ICONERROR);
return 0;
case XTYP_ADVDATA:
return((HDDEDATA)DDE_FACK);
case XTYP_ERROR:
// only valid for one error (low memory)
// bDCErrorExport has to be set to false, otherwise the error is not shown.
// After that its previous state is restored
bErrorExport = bDCErrorExport;
bDCErrorExport = false;
DCGetLastError(dwDDEInst, csMsg);
bDCErrorExport = bErrorExport;
return 0;
default:
return 0;
}
}
//
// Extract constant for format of DDE command
//
UINT DDEFormat(char* szFormat)
{
// Null-terminated, plain ANSI text in a global memory block.
if (0 == strnicmp (szFormat,"CF_TEXT",7))
return CF_TEXT;
// A bitmap compatible with Windows 2.x.
if (0 == strnicmp (szFormat,"CF_BITMAP",7))
return CF_BITMAP;
// A Windows metafile with some additional information about how the
// metafile should be displayed.
if (0 == strnicmp (szFormat,"CF_METAFILEPICT",7))
return CF_METAFILEPICT;
// An ASCII text format used by some older Microsoft products.
if (0 == strnicmp (szFormat,"CF_SYLK",7))
return CF_SYLK;
// Software Art's data interchange format (DIF). Also an ASCII text format.
if (0 == strnicmp (szFormat,"CF_DIF",7))
return CF_DIF;
// Tag image file format (TIFF) data in a global memory block.
if (0 == strnicmp (szFormat,"CF_TIFF",7))
return CF_TIFF;
// Similar to CF_TEXT but using the OEM character set.
if (0 == strnicmp (szFormat,"CF_OEMTEXT",7))
return CF_OEMTEXT;
// A global memory block containing a Windows device-independent bitmap (DIB)
// as a BITMAPINFO structure followed by the bitmap bits.
if (0 == strnicmp (szFormat,"CF_DIB",7))
return CF_DIB;
// A color-palette handle. (Used in conjunction with CF_DIB.)
if (0 == strnicmp (szFormat,"CF_PALETTE",7))
return CF_PALETTE;
// Data is for the pen extensions to Windows.
if (0 == strnicmp (szFormat,"CF_PENDATA",7))
return CF_PENDATA;
// Resource interchange file format (RIFF) data as a global memory block.
if (0 == strnicmp (szFormat,"CF_RIFF",7))
return CF_RIFF;
// A specific case of RIFF in which the contained data is a waveform (sampled sound).
if (0 == strnicmp (szFormat,"CF_WAVE",7))
return CF_WAVE;
return 0;
}
//
// Extract constant or time for timeout of DDE command
//
DWORD DDETimeout(DWORD* pdwTimeout)
{
if (*pdwTimeout > 0)
{
return *pdwTimeout;
}
return TIMEOUT_ASYNC;
}
//
// Set Parameters for DDEClientTransaction considering the type of command
//
void SetDDEParams(WORD wC, char* szType, char* szItem,
char* szData, char* szFormat, DWORD* pdwTimeout)
{
UINT wCmdLen = lstrlen((LPCWSTR)szItem)+1;
if (0 == strnicmp (szType,"execute",7))
{
DdeV[wC]->wType = XTYP_EXECUTE;
DdeV[wC]->wFmt = 0;
// Create a data handle for the exec string
hExecData = DdeCreateDataHandle(dwDDEInst,
(LPBYTE)szItem,
wCmdLen,
0,
NULL,
DdeV[wC]->wFmt,
0);
DdeV[wC]->pData = (LPBYTE)hExecData;
DdeV[wC]->cbData = -1;
DdeV[wC]->hszItem = NULL;
DdeV[wC]->dwTimeout = DDETimeout(pdwTimeout);
//DdeV[wC]->pdwResult = NULL;
DdeV[wC]->dwResult = 0;
return;
}
if (0 == strnicmp (szType,"poke",4))
{
DdeV[wC]->wType = XTYP_POKE;
DdeV[wC]->wFmt = DDEFormat(szFormat);
DdeV[wC]->pData = (LPBYTE)szData;
DdeV[wC]->cbData = strlen(szData)+1;
DdeV[wC]->hszItem = DdeCreateStringHandle(dwDDEInst, (LPCWSTR)szItem, CP_WINANSI );
DdeV[wC]->dwTimeout = DDETimeout(pdwTimeout);
//DdeV[wC]->pdwResult = NULL;
DdeV[wC]->dwResult = 0;
return;
}
if (0 == strnicmp (szType,"request",7))
{
DdeV[wC]->wType = XTYP_REQUEST;
DdeV[wC]->pData = NULL;
DdeV[wC]->cbData = 0;
DdeV[wC]->hszItem = DdeCreateStringHandle(dwDDEInst, (LPCWSTR)szItem, CP_WINANSI );
DdeV[wC]->wFmt = DDEFormat(szFormat);
DdeV[wC]->dwTimeout = DDETimeout(pdwTimeout);
DdeV[wC]->dwResult = 0;
return ;
}
if (0 == strnicmp (szType,"advise_start",12))
{
DdeV[wC]->wType = XTYP_ADVSTART;
DdeV[wC]->pData = NULL;
DdeV[wC]->cbData = 0;
DdeV[wC]->hszItem = DdeCreateStringHandle(dwDDEInst, (LPCWSTR)szItem, CP_WINANSI );
DdeV[wC]->wFmt = DDEFormat(szFormat);
DdeV[wC]->dwTimeout = DDETimeout(pdwTimeout);
DdeV[wC]->dwResult = 0;
return ;
}
if (0 == strnicmp (szType,"advise_stop",11))
{
//return XTYP_ADVSTOP;
}
}
// procedure retriving DDE Data as string.
bool DdeDataString(WORD wC, HDDEDATA hData)
{
if (!hData) return false;
else
{
// get the data as string
char* pszDdeData = (char *) DdeAccessData(hData, &DDA[wC]->dwLen);
if(pszDdeData)
{
// store data in a new array, otherwise it is lost with
// asynchronous transactions
DDA[wC]->pszData = (char *)malloc(DDA[wC]->dwLen);
char* pszData = DDA[wC]->pszData;
for (DWORD i = 0; i < DDA[wC]->dwLen; i++)
pszData[i] = *pszDdeData++;
DdeUnaccessData( hData );
return true;
}
else
return false;
}
}
// short form of DCTransaction for string request transaction
bool DCRequestString(WORD wC, char szItem[], DWORD dwTimeout)
{
csMsg = "";
DdeV[wC]->wType = XTYP_REQUEST;
DdeV[wC]->dwTimeout = DDETimeout(&dwTimeout);
// Send the request
DdeV[wC]->hData = DdeClientTransaction(NULL, 0, DdeV[wC]->hConv,
DdeCreateStringHandle(dwDDEInst, (LPCWSTR)szItem, CP_WINANSI ),
CF_TEXT,
DdeV[wC]->wType,
DdeV[wC]->dwTimeout,
&(DdeV[wC]->dwResult));
// store transaction ID
DDA[wC]->dwTransID = DdeV[wC]->dwResult;
// Check for DDE data
if (DdeV[wC]->hData==NULL)
{
csMsg = (CString)ccMsgRequestFailed + szItem;
return 0;
}
else
{
if (DdeV[wC]->dwTimeout != TIMEOUT_ASYNC)
{
// data access for synchronous transactions
if(!DdeDataString(wC,DdeV[wC]->hData))
{
FreeData(wC);
csMsg = (CString)ccMsgRequestFailed + szItem;
return false;
}
else return true;
}
else
{
strncpy(DDA[wC]->szAccType,"string",sizeof(DDA[wC]->szAccType));
}
}
return true;
}
// procedure retrieving DDE data as byte array
bool DdeDataBytes(WORD wC, HDDEDATA hData)
{
// Check for DDE data
if (hData==NULL)
{
DDA[wC]->pData = NULL;
DDA[wC]->dwLen = NULL;
return false;
}
else
{
// Get data
BYTE* pDdeData = DdeAccessData(hData, &DDA[wC]->dwLen);
if(pDdeData)
{
// store data in a new array, otherwise it is lost with
// asynchronous transactions
DDA[wC]->pData = (BYTE *)malloc(DDA[wC]->dwLen);
BYTE* pData = DDA[wC]->pData;
for (DWORD i = 0; i < DDA[wC]->dwLen; i++)
pData[i] = *pDdeData++;
DdeUnaccessData( hData );
return true;
}
else
return false;
}
}
// procedure for DDE request giving back a pointer to the data
bool DCRequest(WORD wC, char szItem[], char szFormat[], DWORD dwTimeout )
{
csMsg = "";
// Set parameters for a single DDE conversation
SetDDEParams(wC, "request", szItem, NULL, szFormat, &dwTimeout);
// Send the request
DdeV[wC]->hData = DdeClientTransaction(DdeV[wC]->pData,
DdeV[wC]->cbData,
DdeV[wC]->hConv,
DdeV[wC]->hszItem,
DdeV[wC]->wFmt,
DdeV[wC]->wType,
DdeV[wC]->dwTimeout,
&(DdeV[wC]->dwResult));
// store transaction ID
DDA[wC]->dwTransID = DdeV[wC]->dwResult;
if (DdeV[wC]->dwTimeout != TIMEOUT_ASYNC)
{
// data access for synchronous transaction
if(!DdeDataBytes(wC, DdeV[wC]->hData))
{
FreeData(wC);
csMsg = (CString)ccMsgRequestFailed + szItem;
return false;
}
else return true;
}
else
{
strncpy(DDA[wC]->szAccType,"byte",sizeof(DDA[wC]->szAccType));
}
return true;
}
// Initialize data structure for dde variables
bool InitDdeVars(HCONV hConv, WORD wC)
{
// assign memory for conversation variables
DdeV[wC] = (DDEVARS *)malloc(sizeof(DDEVARS));
if (DdeV[wC] == NULL)
{
csMsg = (CString)ccMsgNotEnoughMemory01;
return false;
}
memset(DdeV[wC], 0, sizeof(DdeV[wC]));
DdeV[wC]->hConv = hConv;
return true;
}
// Initialize data structure for dde data access
bool InitDCDataAccess(WORD wC)
{
// assign memory for data access variables
DDA[wC] = (DCDATAACCESS *)malloc(sizeof(DCDATAACCESS));
if (DDA[wC] == NULL)
{
csMsg = (CString)ccMsgNotEnoughMemory02;
return false;
}
DDA[wC]->pData = NULL;
DDA[wC]->dwLen = 0;
DDA[wC]->pszData = NULL;
strncpy(DDA[wC]->szAccType,"string",sizeof(DDA[wC]->szAccType));
DDA[wC]->dwTransID = 0;
DDA[wC]->dwCbTransID = 0;
return true;
}
// Initiate a conversation with the server application on a topic
// If server is not found, ask to launch it. If either server could
// not be launched or topic is not found give an error message.
bool DCConnect (WORD* pConvNo, char* szService, char* szTopic)
{
HSZ hszDDEServer;
HSZ hszTopic;
HCONV hConv;
csMsg = "";
// Get server application handle
hszDDEServer = DdeCreateStringHandle(dwDDEInst, (LPCWSTR)szService, CP_WINANSI );
// Get topic handle
hszTopic = DdeCreateStringHandle(dwDDEInst, (LPCWSTR)szTopic, CP_WINANSI);
// Get conversation handle
hConv = DdeConnect(dwDDEInst, hszDDEServer, hszTopic, NULL);
DdeFreeStringHandle(dwDDEInst, hszDDEServer);
DdeFreeStringHandle(dwDDEInst, hszTopic);
if(hConv == 0L)
{
csMsg = (CString)ccMsgConnectFailed01 + szService +
(CString)ccMsgConnectFailed02 + szTopic +
(CString)ccMsgConnectFailed03;
return 0;
}
// determine conversation number
if(!GetConvNo(pConvNo))
return false;
// init variables neccessary for conversation
if(!InitDdeVars(hConv, *pConvNo))
{
FreeDdeV(*pConvNo);
return false;
}
else
{
if(!InitDCDataAccess(*pConvNo))
{
FreeDDA(*pConvNo);
return false;
}
return true;
}
}
// procedure for initializing DDEML.DLL
bool DCInit()
{
UINT ui;
// Set message string
csMsg = (CString)ccDMLERRInitialize;
// Initialize DDEML
ui = DdeInitialize(&dwDDEInst,
(PFNCALLBACK) DdeCallback,
APPCMD_CLIENTONLY,
0L);
// Initialize pointer arrays
for(int i = 0; i < wCONVMAX; i++)
{
DdeV[i] = NULL;
DDA[i] = NULL;
}
if (ui != DMLERR_NO_ERROR)
{
DCGetLastError(dwDDEInst, (CString)ccDMLERRInitialize);
return false;
}
else
{
return true;
}
}
// procedure which frees handles of the DDE conversation and memory associated
// with the last transaction. Has has to be called after each transaction
// especially after transactions which give back data.
// Important: After data handle is freed no pointer can access the data.
// Therefore it has to be processed or copied to another buffer before.
bool DCFreeDdeMem(WORD wC)
{
bool bSuccess = true;
CString csMsgLocal = "";
csMsg = "";
// Free string handle now.
if (DdeV[wC]->hszItem != NULL)
{
if(!DdeFreeStringHandle( dwDDEInst, DdeV[wC]->hszItem ))
{
csMsgLocal = (CString)ccMsgHandleErr01;
bSuccess = false;
}
DdeV[wC]->hszItem = NULL;
}
// Free data handle now
if(DdeV[wC]->hData)
{
if(!DdeFreeDataHandle(DdeV[wC]->hData))
{
csMsgLocal = csMsgLocal + (CString)" " + (CString)ccMsgHandleErr02;
bSuccess = false;
}
DdeV[wC]->hData = 0L;
}
// Free memory of dde data buffers
FreeData(wC);
if (!bSuccess) csMsg = csMsgLocal;
return bSuccess;
}
// procedure which disconnects a DDE connection
bool DCDisconnect(WORD wC)
{
int nSuccess = 1;
CString csMsgLocal = "";
csMsg = "";
// Free handles and memory associated with the last transaction
if(!DCFreeDdeMem(wC)) csMsgLocal = csMsg;
// Done with the conversation now.
nSuccess = DdeDisconnect(DdeV[wC]->hConv);
// Free memory for DDE variables
FreeDdeV(wC);
// Free memory for DDE data access variables
FreeDDA(wC);
if (nSuccess == 0)
{
DCGetLastError(dwDDEInst, csMsgLocal + (CString) " " +
(CString)szMsgDMLERRDisconnect);
return false;
}
return true;
}
// procedure which uninitializes DDEML.DLL
bool DCUninit()
{
if(DdeUninitialize(dwDDEInst))// && AfxFreeLibrary(dwDDEInst))
{
// Reset instance handle
dwDDEInst = 0;
return true;
}
else
{
DCGetLastError(dwDDEInst, (CString)szMsgDMLERRUninitialize);
return false;
}
}
// handle DDE data
bool DdeDataHandling(WORD wC, HDDEDATA hData, char szAccess[])
{
bool bSuccess = false;
if (0 == strnicmp (szAccess,"string",6))
{
// get pointer to the data as string //in pszDCDataString
bSuccess = DdeDataString(wC, hData);
}
else if (0 == strnicmp (szAccess,"byte",4))
// fill c-structure with data for dde data access
bSuccess = DdeDataBytes(wC, hData);
return bSuccess;
}
// Do a DDE Transaction
bool DCTransaction(WORD wC, char szType[], char szItem[], char szData[],
char szFormat[], DWORD dwTimeout, char szAccess[])
{
bool bSuccess = true;
csMsg = "";
// Set parameters for dde transaction
SetDDEParams(wC, szType, szItem, szData, szFormat, &dwTimeout);
// execute dde transaction
DdeV[wC]->hData = DdeClientTransaction(DdeV[wC]->pData,
DdeV[wC]->cbData,
DdeV[wC]->hConv,
DdeV[wC]->hszItem,
DdeV[wC]->wFmt,
DdeV[wC]->wType,
DdeV[wC]->dwTimeout,
&(DdeV[wC]->dwResult));
// store transaction ID
DDA[wC]->dwTransID = DdeV[wC]->dwResult;
// Error handling
if (DdeV[wC]->hData == 0)
{
// Transaction failed
csMsg = (CString)"'" + szType + (CString)" " + szItem + (CString)"' " +
(CString)ccMsgTransactionFailed;
bSuccess = false;
}
// data handling for synchronous transactions
else if ((DdeV[wC]->wType == XTYP_REQUEST) &&
(DdeV[wC]->dwTimeout != TIMEOUT_ASYNC))
{
bSuccess = DdeDataHandling(wC, DdeV[wC]->hData, szAccess);
if (!bSuccess)
{
FreeData(wC);
csMsg = (CString)ccMsgRequestFailed + szItem;
}
}
// store variable for data access format for asynchronous transaction
else if (DdeV[wC]->dwTimeout == TIMEOUT_ASYNC)
strncpy(DDA[wC]->szAccType,szAccess,sizeof(DDA[wC]->szAccType));
return bSuccess;
}
// procedure which gives back the message of last error.
// By bDCErrorExport is decided whether the message is the return value of
// the function or displayed in a message box.
// The length of the message is is determined by the size of szErrorMsg.
// If the message is longer than sizeof(szErrorMsg) it will be cut off,
// and a comment is given.
char* DCLastError()
{
if(bDCErrorExport)
{
return (char*)csMsg.GetBuffer(0);
}
else
{
//MessageBox((HWND)GetActiveWindow(), csMsg, ccMsgCaption, MB_OK | MB_ICONERROR);
return 0;
}
}
// procedure which frees memory of DDE data
void FreeData(WORD wC)
{
// Free memory of dde data
if(DDA[wC] != NULL)
{
if(DDA[wC]->pszData != NULL)
{
free(DDA[wC]->pszData);
DDA[wC]->pszData = NULL;
}
if(DDA[wC]->pData != NULL)
{
free(DDA[wC]->pData);
DDA[wC]->pData = NULL;
}
}
}
// procedure which frees memory, to be called before ending dll access.
void DCFinalize()
{
for (WORD i = 0; i < wCONVMAX; i++)
{
FreeData(i);
FreeDdeV(i);
FreeDDA(i);
}
_heapmin();
}
// helper procedure for DCAsynchTransactionCompleted which determines
// if a certain asynchronous transaction has completed.
bool AsynchTransactionCompleted(WORD wC, DWORD dwTransID)
{
MSG msg;
bool bSuccess = true;
csMsg = "";
if(dwTransID == DDA[wC]->dwCbTransID)
{
// Transaction IDs are equal, the desired transaction
// was already handled by the callback function
DDA[wC]->dwCbTransID = 0;
bSuccess = bCbSuccess;
//char szTemp[100];
//sprintf(szTemp,"Entry TransID = CbTransID bSuccess: %i",bSuccess);
////MessageBox((HWND)GetActiveWindow(), szTemp, "AsynchTransactionCompleted", MB_OK);
}
else
{
// look for message in message queue
if(PeekMessage(&msg, NULL, 0, 0, PM_REMOVE) == 0)
{
// no message in queue
csMsg = (CString)ccMsgNoWindowsMessage;
bSuccess = false;
}
else
{
//char szTemp[100];
//sprintf(szTemp,"Before dispatch Message: %i TransID = %i CbTransID = %i",msg.message,dwTransID,DDA[wC]->dwCbTransID);
////MessageBox((HWND)GetActiveWindow(), szTemp, "AsynchTransactionCompleted", MB_OK);
TranslateMessage(&msg);
DispatchMessage(&msg);
// a message was in the queue, is dispatched
// and may have invoked the callback function
//sprintf(szTemp,"After dispatch TransID = %i CbTransID = %i",dwTransID,DDA[wC]->dwCbTransID);
////MessageBox((HWND)GetActiveWindow(), szTemp, "AsynchTransactionCompleted", MB_OK);
if(dwTransID == DDA[wC]->dwCbTransID)
{
// Transaction IDs are equal, the desired transaction was handled
// by the callback function
//sprintf(szTemp,"TransID = CbTransID Message: %i",msg.message);
////MessageBox((HWND)GetActiveWindow(), szTemp, "AsynchTransactionCompleted", MB_OK);
DDA[wC]->dwCbTransID = 0;
switch (msg.message)
{
case 996: // = WM_DDE_ACK
if((DdeV[wC]->wType == XTYP_EXECUTE) |
(DdeV[wC]->wType == XTYP_POKE))
// execute and poke return only an ACK
bSuccess = bCbSuccess;
if(DdeV[wC]->wType == XTYP_REQUEST)
{
// when command cannot be processes (applies not to all servers)
csMsg = (CString)ccMsgAsynchRequestNotCompleted;
bSuccess = false;
}
break;
case 997: // = WM_DDE_DATA
if(DdeV[wC]->wType == XTYP_REQUEST)
{
// request return data when finished
bSuccess = bCbSuccess;
//sprintf(szTemp,"inside WM_DDE_DATA bSuccess: %i",bSuccess);
////MessageBox((HWND)GetActiveWindow(), szTemp, "AsynchTransactionCompleted", MB_OK);
}
break;
default:
//char szTemp[100];
//sprintf(szTemp,"inside default branch");
////MessageBox((HWND)GetActiveWindow(), szTemp, "AsynchTransactionCompleted", MB_OK);
csMsg = (CString)ccMsgAsynchTransNotCompleted;
bSuccess = false;
}
}
else
{
csMsg = (CString)ccMsgAsynchTransNotCompleted;
bSuccess = false;
}
}
}
//char szTemp[100];
//sprintf(szTemp,"Before exit bSuccess: %i",bSuccess);
////MessageBox((HWND)GetActiveWindow(), szTemp, "AsynchTransactionCompleted", MB_OK);
return bSuccess;
}
// procedure which determines if a certain asynchronous transaction
// has completed. Only to use for one transaction at a time, because
// messages from other transactions will be ignored. Procedure enables
// quasi synchronous behavior for asynchronous request, if called
// after transaction call. To use if in between a transaction is processed
// by a server some other calculations shall be done in the program without
// waiting for the server to finish the transaction. After the calculations
// this procedure can be called. If the server has finished it returns true,
// if not false.
// bWait: controls, if the procedure shall wait until the transaction is
// finished (true) or only check once for completion (false).
bool DCAsynchTransactionCompleted(WORD wC, DWORD dwTransID, bool bWait)
{
bool bSuccess;
do
{
bSuccess = AsynchTransactionCompleted(wC, dwTransID);
// transaction completed with error
if(!bCbSuccess) return false;
// transaction completed successful
else if(bSuccess && bCbSuccess) return true;
//
}while(bWait && !bSuccess && bCbSuccess);
// no message available
return false;
}
// procedure which retrives the conversation number from a given
// conversation handle
WORD FindConvNo(HCONV hConv)
{
for(WORD i = 0; i < wCONVMAX; i++)
if(DdeV[i]->hConv == hConv)
return i;
return wCONVMAX + 1;
}
// procedure which determines the next conversation number
bool GetConvNo(WORD* pConvNo)
{
WORD i = 0;
while((i < wCONVMAX) && (DdeV[i] != NULL)) i++;
if (i >= wCONVMAX)
{
// too many conversations
csMsg = (CString)ccMsgConvMaxError;
return false;
}
else
{
*pConvNo = i;
return true;
}
}
// Free memory for DDE variables
void FreeDdeV(WORD wC)
{
if(DdeV[wC] != NULL)
{
free(DdeV[wC]);
DdeV[wC] = NULL;
}
return;
}
// Free memory for DDE data access variables
void FreeDDA(WORD wC)
{
if(DDA[wC] != NULL)
{
free(DDA[wC]);
DDA[wC] = NULL;
}
return;
}
// procedure to abandon an asynchronous transaction
// takes the conversation number and the transaction id
bool DCAbandonTransaction(WORD wC, DWORD dwTransID)
{
bool bSuccess;
bSuccess = DdeAbandonTransaction(dwDDEInst, DdeV[wC]->hConv, dwTransID);
FreeData(wC);
if(!bSuccess)
{
DCGetLastError(dwDDEInst, (CString)ccMsgAbandonTransaction);
bSuccess = false;
}
else
{
bSuccess = true;
}
return bSuccess;
}
// procedure which gives back the version of this dll
char* DCVersion()
{
return szVersion;
} |
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