Fr om Lon g t o H e x a de cim a l a nd Ba ck Aga in in VB.NET

Create DataMatrix in VB.NET Fr om Lon g t o H e x a de cim a l a nd Ba ck Aga in

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Visual Basic has long had t he Hex funct ion for convert ing int eger num eric v alues t o hexadecim al st rings t hat r epresent t he num eric v alue of t he Hex funct ion argum ent . The .NET docum ent at ion explicit ly st at es t hat t he funct ion w ill w or k for Byt e, Short , I nt eger, Long, and Obj ect dat a t ypes. As it t urns out , t he m axim um value t hat t he Hex funct ion w ill convert is 9,223,372,036,854,775,807, which is t he m ax im um Long value t ype. Values abov e t his raise an except ion.
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I f you ar en t fam iliar wit h conversions bet ween hexadecim al num bers and base 10, you can use t he Windows Calculat or t o help ver ify t he operat ion of t he sam ples in t his sect ion.
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The follow ing pair of procedur es dem onst rat es how t o use t he Hex funct ion t o conv ert t he Long value in t he t ext box from t he preceding sam ple t o a Hex value t hat appears in a m essage box. Click ing But t on3 on t he form in t he Ty peTest s proj ect launches t he Conv ert LngToHex pr ocedure. This pr ocedur e s list ing dem onst rat es t he synt ax for specify ing a condit ional com pilat ion, w hich includes t he # befor e k eyw ords. The value of BoundCheck is True, so t he com piler insert s t he opt ional code t hat per form s a bound check t o abort t he conv ersion if t he Hex funct ion argum ent is great er t han t he m ax im um value t hat t he built - in funct ion can convert . Condit ional com pilat ion was init ially int roduced int o Visual Basic w it h version 5. The conv ersion pr ocedur e concludes by display ing t he ret urn value of t he Hex funct ion ( unless t he procedure abort s because t he argum ent is t oo large) .
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Set t ing t he BoundCheck com piler const ant t o False perm it s you t o generat e an ex cept ion for v alues gr eat er t han t he m ax im um conversion value for exam ple, 9,223,372,036,854,775,808.
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Private Sub Button3_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles Button3.Click Call procedure to convert text box value from long to hexadecimal. ConvertLngToHex() End Sub Sub ConvertLngToHex() #Const BoundCheck = True #If BoundCheck Then Bound check on input; use CDec to accommodate values beyond bound check. If CDec(TextBox1.Text) > 9223372036854775807 Then MsgBox( Number too large for Hex function. ) Exit Sub End If #End If Convert from string representation of Long number to hex character representation of number. MsgBox( Hex value of text box equals: & vbCrLf & _ Hex(CLng(TextBox1.Text)))
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End Sub Going from a hexadecim al value t o a Long value is m or e com plicat ed for a couple of reasons. First , t her e is no built - in funct ion. Second, hexadecim al num bers need t o be convert ed on a charact er - by - charact er basis t hat reflect s t he char act er s posit ion in t he hexadecim al num ber. This t ask is furt her com plicat ed by t hat fact t hat charact ers go out side t he decim al range of 0 t hrough 9 t o t he hex adecim al range of 0 t hrough F. The follow ing sam ple per for m s a check t o v er ify t hat t he hexadecim al st r ing value doesn t exceed t he m axim um Long value. The hex represent at ion for t he m axim um Long value is 7FFFFFFFFFFFFFFF. Aft er perform ing a bound check for t he m ax im um hex adecim al value, t he Convert Hex ToLng pr ocedur e st art s a loop t hat it erat es t hr ough successiv e charact ers in t he hexadecim al num ber. St art ing at t he far r ight charact er , t he loop evaluat es each charact er. The evaluat ion m ult iplies t he hex charact er s decim al v alue by a power of 16. The pow ers range in value fr om 0 for t he far right charact er t o up t o 15 for t he sixt eent h hex charact er ( if t her e is one) . When t he Conv ert HexToLng procedur e finishes looping t hr ough t he charact er s in t he hexadecim al num ber, t he pr ocedur e present s a m essage box w it h t he decim al value of t he hexadecim al num ber in Text Box1. Private Sub Button4_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles Button4.Click Call program to convert a hexadecimal number to a Long number. ConvertHexToLng() End Sub Sub ConvertHexToLng() Assign TextBox1 contents to hexStr. Dim strValue As String = TextBox1.Text Dim hexStr As String = TextBox1.Text If hexStr greater than 7FFFFFFFFFFFFFFF, then abort. Dim hexchars As Integer = Len(hexStr) If (hexchars = 16 And hexStr.Chars(0) > 7 ) Or _ hexchars > 16 Then MsgBox( Hex values beyond 7FFFFFFFFFFFFFFF & _ generate an exception. Enter a smaller & _ hex value. ) Exit Sub End If Variable lnghexstr stores long of hex string in TextBox1, and i is a loop counter value. Dim lnghexstr As Long Dim i As Integer Loop through characters to compute decimal equivalent of hex string. lnghexstr = 0 For i = 0 To hexchars - 1 Select Case Mid(UCase(hexStr), hexchars - i, 1) Case 0" lnghexstr += CLng(0 * (16 ^ i)) Case 1" lnghexstr += CLng(1 * (16 ^ i)) Case 2" lnghexstr += CLng(2 * (16 ^ i)) Case 3"
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lnghexstr Case 4" lnghexstr Case 5" lnghexstr Case 6" lnghexstr Case 7" lnghexstr Case 8" lnghexstr Case 9" lnghexstr Case A" lnghexstr Case B " lnghexstr Case C" lnghexstr Case D" lnghexstr Case E"
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+= CLng(3 * (16 ^ i)) += CLng(4 * (16 ^ i)) += CLng(5 * (16 ^ i)) += CLng(6 * (16 ^ i)) += CLng(7 * (16 ^ i)) += CLng(8 * (16 ^ i)) += CLng(9 * (16 ^ i)) += CLng(10 * (16 ^ i)) += CLng(11 * (16 ^ i)) += CLng(12 * (16 ^ i)) += CLng(13 * (16 ^ i))
lnghexstr += CLng(14 * (16 ^ i)) Case F" lnghexstr += CLng(15 * (16 ^ i)) End Select Next i Display long value for hex string. MsgBox( Long value for text box equals: & vbCrLf & _ lnghexstr.ToString) End Sub
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