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Annotation of os2sdk/demos/apps/lqh/lqhinit.c, revision 1.1

1.1     ! root        1: /****************************************************************************
        !             2: 
        !             3:     PROGRAM: lqh.c
        !             4: 
        !             5:     MODULE: lqhinit.c
        !             6: 
        !             7:     FUNCTIONS:
        !             8:         Init()
        !             9: 
        !            10:     COMMENTS:
        !            11:         This module contains all the initialization that needs to be done
        !            12:         when opening a new database. It returns TRUE if initialization was
        !            13:         successful, or FALSE if the requested database could not be found
        !            14:         or opened.
        !            15: 
        !            16: ****************************************************************************/
        !            17: 
        !            18: #include "lqh.h"
        !            19: 
        !            20: BOOL Init() {
        !            21:     USHORT i;
        !            22:     CHAR chMessage[80];
        !            23:     BYTE bScanCode;
        !            24:     NC ncRequest;
        !            25: 
        !            26:     if (ncHelp)         /* Closes the current data file if its open */
        !            27:         HelpClose(ncHelp);
        !            28: 
        !            29:     /* Open the help data file */
        !            30: 
        !            31:     if (!(ncHelp = HelpOpen((PCH) chHelpName))) {
        !            32:         Dstrcpy(chMessage, "Cannot open ");
        !            33:         Dstrcat(chMessage, chHelpName);
        !            34:         BoxMessage(chMessage, atWARNING, THIN, hmou, TRUE);
        !            35:         return FALSE;
        !            36:     }
        !            37: 
        !            38:     /* A table is maintained of all preloaded topics that includes the
        !            39:      * context number, the segment selector, the current top line displayed,
        !            40:      * and the current highlighted line (if any). When HelpSearch is called,
        !            41:      * it checks this table, and if the context number is found, it uses the
        !            42:      * selector associated with that context number to retrieve the
        !            43:      * decompressed data. If the context number is not found, it will call the
        !            44:      * help-engine routines to decompress the data. Whenever Init() is called,
        !            45:      * it deallocates any existing selectors, and clears all the context
        !            46:      * numbers, that indicate no data has been preloaded.
        !            47:      */
        !            48: 
        !            49:     for (i = 0; i < MAXPRELOAD; i++) {
        !            50:         selTable[i].ncContext = (NC) 0; /* no context               */
        !            51:         selTable[i].usTopLine = 1;    /* default current position   */
        !            52:         if (selTable[i].sel)          /* Frees any allocated memory */
        !            53:             DosFreeSeg(selTable[i].sel);
        !            54:     }
        !            55: 
        !            56:     usListPos = 0;
        !            57:     if ((ncRequest = HelpNc("List categories", ncHelp))) {
        !            58: 
        !            59:         /* The list of categories will be small, so both the
        !            60:          * compressed and decompressed data are placed in the 64K-memory block
        !            61:          * that is used for the character-attribute strings.
        !            62:          */
        !            63: 
        !            64:         HelpLook(ncRequest, MAKEP(selStringTable, 0));
        !            65:         HelpDecomp(MAKEP(selStringTable, 0),
        !            66:             MAKEP(selStringTable, 32000), ncRequest);
        !            67:         while (HelpGetLine(usListPos + 2, MAXCATNAME,
        !            68:                 (PCH) lstList[usListPos].name, MAKEP(selStringTable, 32000))
        !            69:                 > 1)
        !            70:             usListPos++;
        !            71:     }
        !            72: 
        !            73:     return TRUE;
        !            74: }

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