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converting hex value to decimal value

Posted on 1997-06-25
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Last Modified: 2006-11-17
i have a problem, in my app. i have to convert decimal to hex (no problem with hex(variable)) but i also want to do the opposite. I want to convert a hex value into a decimal value and i have not found any way to do it... help me..

p.s: i use vb-pro 3
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Question by:njacques
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4 Comments
 

Accepted Solution

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Johanl earned 50 total points
ID: 1427720
Hi Jacques,

Create a module file, insert two functions :

Public Function HexToDec(n)
Dim nLen
Dim i
Dim ndec

ndec = 0
nLen = Len(n)

For i = nLen - 1 To 0 Step -1
   
    ndec = ndec + (16 ^ i) * GetDecValue(UCase(Mid(n, nLen - i, 1)))
Next
HexToDec = ndec
End Function


Public Function GetDecValue(n)
Dim RetValue

Select Case n
    Case "F"
        RetValue = 15
    Case "E"
        RetValue = 14
    Case "D"
        RetValue = 13
    Case "C"
        RetValue = 12
    Case "B"
        RetValue = 11
    Case "A"
        RetValue = 10
    Case Else
        RetValue = n
End Select
GetDecValue = RetValue
End Function

You can use the converting like :

idec=hextodec("FFFF")
msgbox idec

Regards
Johan Loos
jloos@glo.be

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Author Comment

by:njacques
ID: 1427721
I cannot get you function to reply... I have placed it inside a module file (module1.bas) and the two function are contained into the pull down menu. so here is a part of my code..

If Len(text4.Text) < 6 Then
MsgBox ("Please enter a 6 digit hexadecimal number (RRGGBB)")
Exit Sub
End If

Dim rouge As String
Dim vert As String
Dim bleu As String
                 
rouge = UCase$(Left(text4.Text, 2))
vert = UCase$(Right(Left(text4.Text, 4), 2))
bleu = UCase$(Right(text4.Text, 2))

rougedec = HexToDec("rouge")

vertdec = HexToDec(vert)

bleudec = HexToDec(bleu)

label1.Caption = rougedec
label2.Caption = vertdec
label3.Caption = bleudec

hscroll1.Value = Val(rougedec)
hscroll2.Value = Val(vertdec)
hscroll3.Value = Val(bleudec)

the user enters a 6 digit string and the app split the rr-gg-bb so that they can be converted separatly. when the app get to you function call, the labels get blank... help me (am i using your function right) could my code cause this?

help me
0
 

Expert Comment

by:Johanl
ID: 1427722
rougedec=hextodec(rouge) and NOT rougedec=hextodec("rouge")

I've copied your code for testing and works fine.

Let know if it works now
Johan
0
 

Author Comment

by:njacques
ID: 1427723
i found out that val(&hff)
will do the job so o only got to do this

toconvert$ = "&h" + rouge
decimal = val(toconvert$)

and it converts, save a lot of time and coding

thanks anyway

bye

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