PDS(7.1) Procedures
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Attention!! - This function is outdated and provided for reference and/or education only.
Starting with QB64-PE v3.4.0 the functionality described here was superseded by _OPENFILEDIALOG$.
Additionally since QB64-PE v3.11.0 _FILES$ can be used to read file names programmatically.
Code by Ted Weissgerber
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QB64 was created to be compatible with QB 4.5 or lower versions. PDS(7.1) is not supported. The following sub-procedures have been created to do things that were available in PDS versions of QuickBASIC 7.0 and 7.1.
CURRENCY
MKC$
- PDS could use the CURRENCY variable type and had the MKC$ function to convert those values into 8 byte ASCII string values.
- QB64 can convert _FLOAT currency amounts to strings using _MK$ with _INTEGER64 values:
SCREEN 12 DIM value AS _FLOAT value = 12345678901234.6789 'any currency value with up to 4 decimal point places _PRINTSTRING (1, 50), "[" + MKC$(value) + "]" 'show ASCII string value END '----------------------------------------------- 'converts currency amount to PDS currency string '----------------------------------------------- FUNCTION MKC$ (CurrVal AS _FLOAT) DIM CVal AS _INTEGER64 CVal = CurrVal * 10000 MKC$ = _MK$(_INTEGER64, CVal) END FUNCTION |
- Note
- The _FLOAT currency amount must be multiplied by 10000 before it is converted to the ASCII string value.
CVC
- PDS also had the CVC function to convert MKC$ currency string values back to currency amounts.
- QB64 can use _CV with _INTEGER64 to convert those 8 byte values back to _FLOAT currency values.
- In this example the procedure gets the currency string from a file.
SCREEN 12 DIM currency AS STRING * 8 OPEN "currency.bin" FOR BINARY AS #1 'binary file with MKC$ values created by PDS GET #1, , currency CLOSE #1 _PRINTSTRING (1, 10), "[" + currency + "]" 'show ASCII string value from file _PRINTSTRING (1, 30), STR$(CVC##(currency)) END '----------------------------------------------------------- 'converts currency string to a _FLOAT currency amount '----------------------------------------------------------- FUNCTION CVC## (CurrStr AS STRING) DIM CV AS _INTEGER64 CV = _CV(_INTEGER64, CurrStr) CVC## = CV / 10000 END FUNCTION |
- Note
- The _FLOAT currency amount must be divided by 10000 to create up to 4 decimal point places.
PUT
- Currency values can be PUT directly into BINARY or RANDOM files using an _INTEGER64 variable value.
- Remember to multiply the currency value by 10000 before putting to file.
- Currency values can be PUT directly into BINARY or RANDOM files using an _INTEGER64 variable value.
DIM curr AS _INTEGER64, currency AS _FLOAT currency = 9876.543 curr = currency * 10000 'multiply currency value OPEN "currency.bin" FOR BINARY AS #1 'a binary file to hold PDS currency values PUT #1, , curr CLOSE #1 END |
GET
- When currency values are PUT directly into a BINARY or RANDOM file, _INTEGER64 can GET them directly.
- Remember to divide the currency value by 10000 after getting from file.
- When currency values are PUT directly into a BINARY or RANDOM file, _INTEGER64 can GET them directly.
DIM curr AS _INTEGER64, currency AS _FLOAT OPEN "currency.bin" FOR BINARY AS #1 'any binary file holding PDS currency values GET #1, , curr CLOSE #1 currency = curr / 10000 ' use any floating decimal point type within currency range PRINT currency END |
- Note
- The currency value can be any SINGLE, DOUBLE or _FLOAT floating decimal point value that will hold the range of values.
DIR$
- Attention
- Not to be confused with QB64's _DIR$ function.
- This PDS(7.1) derived DIR$ function returns a filename or a list when more than one exist.
- The file specification (spec$) can use a path and/or wildcards.
FOR i = 1 TO 2 PRINT LINE INPUT "Enter a file spec: ", spec$ file$ = DIR$(spec$) 'use a file spec ONCE to find the last file name listed PRINT DIRCount%, file$, 'function can return the file count using SHARED variable IF DIRCount% > 1 THEN DO K$ = INPUT$(1) file$ = DIR$("") 'use an empty string parameter to return a list of files! PRINT file$, LOOP UNTIL LEN(file$) = 0 'file list ends with an empty string END IF NEXT END FUNCTION DIR$ (spec$) CONST TmpFile$ = "DIR$INF0.INF", ListMAX% = 500 'change maximum to suit your needs SHARED DIRCount% 'returns file count if desired. STATIC Ready%, Index%, DirList$() IF NOT Ready% THEN REDIM DirList$(ListMAX%): Ready% = -1 'DIM array first use IF spec$ > "" THEN 'get file names when a spec is given SHELL _HIDE "DIR " + spec$ + " /b > " + TmpFile$ Index% = 0: DirList$(Index%) = "": ff% = FREEFILE OPEN TmpFile$ FOR APPEND AS #ff% size& = LOF(ff%) CLOSE #ff% IF size& = 0 THEN KILL TmpFile$: EXIT FUNCTION OPEN TmpFile$ FOR INPUT AS #ff% DO WHILE NOT EOF(ff%) AND Index% < ListMAX% Index% = Index% + 1 LINE INPUT #ff%, DirList$(Index%) LOOP DIRCount% = Index% 'SHARED variable can return the file count CLOSE #ff% KILL TmpFile$ ELSE IF Index% > 0 THEN Index% = Index% - 1 'no spec sends next file name END IF DIR$ = DirList$(Index%) END FUNCTION |
Explanation The function will verify that a file exists (even if it is empty) by returning it's name or it returns an empty string if no file exists. It can return a list of file names by using an empty string parameter("") after sending a wildcard spec to get the first file name. The number of file names found is returned by using the SHARED variable DIRCount%. |