TeslaRel410/BORLAND/BDE/EXAMPLES/SNIPIT/INPUTREQ.C

// BDE - (C) Copyright 1995 by Borland International

// Callback.C
#include "snipit.h"

static const DBIPATH szTblName      = "CUST2";
static const char szTblType[]       = szDBASE;
pCHAR  CallBackData2;

CBRType DBIFN _export CallBackFunc2(CBType ecbType, UINT32 iClientData,
												pVOID pCbInfo);

//=====================================================================
//  Function:
//          InputReqCallback();
//
//  Description:
//          This example shows how to access a dBASE table which is missing
//          it's .MDX file. This is accomplished with the use of the
//          cbINPUTREQ callback. Note that this method can also be used
//          to access FOX and CLIPPER tables.
//=====================================================================
void InputReqCallback(void)
{
	 hDBIDb      hDb;                        // Handle to the database
	 hDBICur     hCur;                       // Handle to the table
	 UINT16      uNumOfRecs = 5;             // No. of records to display
	 CBInputDesc CbInfo;                     // Variable which is used within
														  //   the callback
	 DBIResult   rslt;                       // Return value from IDAPI
														  //   functions

	 Screen("*** Open Table CallBack Example ***\r\n");

	 BREAK_IN_DEBUGGER();

	 Screen("    Initializing IDAPI...");
	 if (InitAndConnect(&hDb) != DBIERR_NONE)
	 {
		  Screen("*** End of Example ***");
		  return;
	 }

    Screen("    Setting the database directory...");
    rslt = DbiSetDirectory(hDb, (pCHAR) szTblDirectory);
    ChkRslt(rslt, "SetDirectory");

    Screen("    ERROR expected opening the %s table: \r\n"
           "        'Index does not exist'...", szTblName);
    rslt = DbiOpenTable(hDb, (pCHAR) szTblName, (pCHAR) szTblType,
                        NULL, NULL, 0, dbiREADONLY, dbiOPENSHARED,
                        xltFIELD, FALSE, NULL, &hCur);
    ChkRslt(rslt, "OpenTable");

    if (hCur)
    {
        Screen("    Display the %s table...", szTblName);
        DisplayTable(hCur, uNumOfRecs);

        Screen("\r\n    Close the %s table...", szTblName);
        DbiCloseCursor(&hCur);
    }

    // Allocate enough space for the data passed to the callback function.
    CallBackData2 = (pCHAR)malloc(100 * sizeof(CHAR));
    if (CallBackData2 == NULL)
    {
        CloseDbAndExit(&hDb);
        Screen("\r\n*** End of Example ***");
        return;
    }

    // Register the callback.
    rslt = DbiRegisterCallBack(NULL, cbINPUTREQ, (UINT32) CallBackData2,
                               sizeof(CBInputDesc), &CbInfo, CallBackFunc2);
    if(ChkRslt(rslt, "RegisterCallback") != DBIERR_NONE)
    {
		  free(CallBackData2);
        CloseDbAndExit(&hDb);
        Screen("\r\n*** End of Example ***");
        return;
    }

    Screen("\r\n    Open the %s table...", szTblName);
    rslt = DbiOpenTable(hDb, (pCHAR) szTblName, (pCHAR) szTblType,
                        NULL, NULL, 0, dbiREADONLY, dbiOPENSHARED,
                        xltFIELD, FALSE, NULL, &hCur);
    ChkRslt(rslt, "OpenTable");

    if (hCur)
    {
        Screen("    Display the Table...");
        DisplayTable(hCur, uNumOfRecs);

        Screen("\r\n    Close the %s table...", szTblName);
        rslt = DbiCloseCursor(&hCur);
        ChkRslt(rslt, "CloseCursor");
    }

    // Unregister the callback by passing in NULL for the function.
    rslt = DbiRegisterCallBack(NULL, cbINPUTREQ, NULL, 0, NULL, NULL);
    if (ChkRslt(rslt, "RegisterCallBack") != DBIERR_NONE)
    {
        free(CallBackData2);
        CloseDbAndExit(&hDb);
        Screen("\r\n*** End of Example ***");
        return;
    }

    free(CallBackData2);

    Screen("\r\n    Close the database and exit IDAPI...");
    CloseDbAndExit(&hDb);

    Screen("\r\n*** End of Example ***");
}

//======================================================================
//  Name:   CallBackFunc2(ecbType, iClientData, pCbInfo)
//
//  Input:  ecbType     - Callback type
//          iClientData - Pointer to client information that is passed into
//                        the callback function
//          pCbInfo     - The callback structure that holds the information
//                        about the current state
//
//  Return: The action that should be taken
//
//  Description:
//          This function will be called from the BDE during the process
//          of opening the table.
//======================================================================
CBRType DBIFN
CallBackFunc2 (CBType ecbType, UINT32 iClientData, pVOID pCbInfo)
{
    CBInputDesc *eCBInputDesc; // Variable to contain passed-in
                               //   information
    int         i;

    // Set to stop an unused variable warning.
    iClientData = iClientData;

    switch (ecbType)
    {
        // In case this is a restructure progress callback, display the
        //   information.
        case cbINPUTREQ:

            eCBInputDesc = (CBInputDesc far *)pCbInfo;

            Screen("\r\n    ### In the Callback function...\r\n");
                
            Screen("    ### %s", eCBInputDesc->szMsg);
            Screen("\r\n        Options are:");
            for (i = 0; i < eCBInputDesc->iCount; i++)
            {
                Screen("        ### %s: %s",
                       eCBInputDesc->acbEntry[i].szKeyWord,
                       eCBInputDesc->acbEntry[i].szHelp);
            }

            Screen("        ### Default: %s",
                   eCBInputDesc->acbEntry[eCBInputDesc->iSelection].szKeyWord);

            if (eCBInputDesc->eCbInputId == cbiMDXMISSING)
            {
                i = 0;
                while (i < eCBInputDesc->iCount)
                {
                    if (!strcmp(eCBInputDesc->acbEntry[i].szKeyWord,
                             "Open Read Only"))
                    {
                        Screen("\r\n        ### Open the table read only...\r\n");
                        eCBInputDesc->iSelection = i + 1;
                        eCBInputDesc->bSave = FALSE;
                        break;
                    }
                }             
            }
            break;

        default:
            Screen("### In the callback function");
    }

    return cbrCHKINPUT;
}