converting hex value to integer

[Kurt]

Is there a more nice/elegant way of converting a string representing a hexadecimal value to an integer value? At the moment I am doing something like...

 

Public Function MakeInt1(ByVal HexValue As String) As Integer
   Return CType("&H" & HexValue, Integer)
End Function

 

Amazingly this works, while the folowing doesn't

 

Public Function MakeInt2(ByVal HexValue As String) As Integer
   Return Convert.ToInt32("&H" & HexValue)
End Function

 

any comments are more then welcome...

[dynamic_sysop]

CInt ?

eg :

Private Const WS_EX_TRANSPARENT As Integer = CInt(&H20&)

[Kurt]

Yes, it also seems to take a string as argument.

private const WS_EX_TRANSPARENT as integer = cint("&H20")

I assume Cint(x) and Ctype(x,integer) are equal. The Convert - class must work differently...

[Diablicolic]

aahhh!! I don't understand :confused: .

 

I tried doing this on Visual Basic...You see what I want is this:

 

Someone types a number into TextBox1 (Hex), and then clicks Button1, and shows the Integer in TextBox2 (Integer).

 

And how could I do vice-versa? Integer --> Hex?

[dynamic_sysop]

you can do this also , much simpler....

Dim x As Integer = Integer.Parse(&H20&)
MessageBox.Show(x)

[Diablicolic]

you can do this also , much simpler....

Dim x As Integer = Integer.Parse(&H20&)
MessageBox.Show(x)

 

Cool!!

 

What does &H20& do?

 

And where could I find the codes like &H20&?

 

And was does Parse do?

[Volte]

&H20& is hex for 32. Integer.Parse takes a string value and converts it to an integer. I'm not so sure that dynamic_sysop's example is exactly what Kurt wants, since &H20& is recognized by VB as a number regardless of being parsed.

 

You need to use Convert.ToInt32() and specify the base.

MessageBox.Show(Convert.ToInt32("20", 16))

Will show 32. Note you shouldn't include the &H part.

[Diablicolic]

Now that's from Hex --> Int, how about Int --> Hex

 

Volte?

[Volte]

MessageBox.Show(Convert.ToString(32, 16))

Will show "20".

[Diablicolic]

Sweet! I put that into my notes, thanks!