Bin2U()Source code
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Bin2U( <cBuffer> ) → nNumbercBuffer is a character string that contains 32-bit encoded unsigned long integer (least significant byte first). The first four bytes are taken into account, the rest if any are ignored.Bin2U() return numeric integer (or 0 if cBuffer is not a string).Bin2U() is one of the low-level binary conversion functions, those functions convert between Harbour numeric and a character representation of numeric value. Bin2U() take four bytes of encoded 32-bit unsigned long integer and convert it into standard Harbour numeric value.
You might ask what is the need for such functions, well, first of all it allow you to read/write information from/to a binary file (like extracting information from DBF header), it is also a useful way to share information from source other than Harbour (C for instance).
Bin2U() is the opposite of U2Bin()
// Show number of records in DBF
#include "fileio.ch"
LOCAL hFile, cBuffer := Space( 4 )
IF ( hFile := hb_vfOpen( "test.dbf", FO_READ ) ) != NIL
hb_vfSeek( hFile, 4 )
hb_vfRead( hFile, @cBuffer, hb_BLen( cBuffer ) )
? "Number of records in file:", Bin2U( cBuffer )
hb_vfClose( hFile )
ELSE
? "Cannot open file"
ENDIF
U2Bin()Source code
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U2Bin( <nNumber> ) → cBuffernNumber is a numeric value to convert (decimal digits are ignored).U2Bin() return four bytes character string that contains 32-bit encoded unsigned long integer (least significant byte first).U2Bin() is one of the low-level binary conversion functions, those functions convert between Harbour numeric and a character representation of numeric value. U2Bin() take a numeric integer value and convert it into four bytes of encoded 32-bit unsigned long integer.
You might ask what is the need for such functions, well, first of all it allow you to read/write information from/to a binary file (like extracting information from DBF header), it is also a useful way to share information from source other than Harbour (C for instance).
U2Bin() is the opposite of Bin2U()
W2Bin()Source code
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W2Bin( <nNumber> ) → cBuffernNumber is a numeric value to convert (decimal digits are ignored).W2Bin() return two bytes character string that contains 16-bit encoded unsigned short integer (least significant byte first).W2Bin() is one of the low-level binary conversion functions, those functions convert between Harbour numeric and a character representation of numeric value. W2Bin() take a numeric integer value and convert it into two bytes of encoded 16-bit unsigned short integer.
You might ask what is the need for such functions, well, first of all it allow you to read/write information from/to a binary file (like extracting information from DBF header), it is also a useful way to share information from source other than Harbour (C for instance).
W2Bin() is the opposite of Bin2W()
dbSkipper()
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dbSkipper( <nRecs> ) → nSkippednRecs is the number of records to skip relative to current record. Positive number would try to move the record pointer forward, while a negative number would try to move the record pointer back nRecs records.dbSkipper() return the number of actual record skipped.dbSkipper() is a helper function used in browse mechanism to skip a number of records while giving the caller indication about the actual records skipped.// open a file and find if we've got enough records in it
USE test
IF dbSkipper( 100 ) == 100
? "Good work! You can party now"
ELSE
? "Too bad, you should really work harder"
ENDIF
SKIP