How to Convert Byte Array to Int32 (Big-endian)

**Cor Ligthert** · Nov 21 '05, 10:52 AM

Re: How to Convert Byte Array to Int32 (Big-endian)

Charles,

We have a long time not seen you, so welcome back,

Maybe a crazy idea for you, however multiplying and adding?

Cor

**Herfried K. Wagner [MVP]** · Nov 21 '05, 10:52 AM

Re: How to Convert Byte Array to Int32 (Big-endian)

"Charles Law" <blank@nowhere. com> schrieb:[color=blue]
>I thought this had come up before, but I now cannot find it.
>
> I have a byte array, such as
>
> Dim a() As Byte = {1, 2, 3, 4}
>
> I want to convert this to an Int32 = 01020304 (hex).
>
> If I use BitConverter, I get 04030201.
>
> Is there a built-in way to do this, or am I stuck with extracting and
> shifting each byte manually?[/color]

You may want to reverse the byte array before using 'BitConverter'.

--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://dotnet.mvps.org/dotnet/faqs/>

**Charles Law** · Nov 21 '05, 10:52 AM

Re: How to Convert Byte Array to Int32 (Big-endian)

Hi Cor

I haven't really been away, just a bit quiet. I did respond to someone the
other day about a serial comms issue crashing their prog, but no word yet
whether it fixed the problem.
[color=blue]
> Maybe a crazy idea for you, however multiplying and adding?[/color]

Yes, that is currently what I do, or rather what the VB6 code that I am
converting does. I was just looking for a native .NET way to do it. It seems
to me that there should be a switch, or extra parameter to pass that allows
one to specify big or little-endianness, but I haven't spotted it.

Charles

"Cor Ligthert" <notmyfirstname @planet.nl> wrote in message
news:%23c85Pk7$ EHA.1524@TK2MSF TNGP09.phx.gbl. ..[color=blue]
> Charles,
>
> We have a long time not seen you, so welcome back,
>
> Maybe a crazy idea for you, however multiplying and adding?
>
> Cor
>[/color]

**Charles Law** · Nov 21 '05, 10:52 AM

Re: How to Convert Byte Array to Int32 (Big-endian)

Hi Herfried

As I have just replied to Cor, I kind of expected a switch somewhere to
allow me to specify the endianness of the operation, but it seems to be
fixed.

I had toyed with reversing the bytes, but then I might just as well stick to
carving the array up by hand. Besides, it makes it a two-stage process, so
to avoid duplication I would need a function wrapper.

Perhaps I am just being picky, but I like to use built-in stuff wherever
possible; or maybe it's laziness ;-)

Charles

"Herfried K. Wagner [MVP]" <hirf-spam-me-here@gmx.at> wrote in message
news:uU6iyn7$EH A.1300@TK2MSFTN GP14.phx.gbl...[color=blue]
> "Charles Law" <blank@nowhere. com> schrieb:[color=green]
>>I thought this had come up before, but I now cannot find it.
>>
>> I have a byte array, such as
>>
>> Dim a() As Byte = {1, 2, 3, 4}
>>
>> I want to convert this to an Int32 = 01020304 (hex).
>>
>> If I use BitConverter, I get 04030201.
>>
>> Is there a built-in way to do this, or am I stuck with extracting and
>> shifting each byte manually?[/color]
>
> You may want to reverse the byte array before using 'BitConverter'.
>
> --
> M S Herfried K. Wagner
> M V P <URL:http://dotnet.mvps.org/>
> V B <URL:http://dotnet.mvps.org/dotnet/faqs/>[/color]

**Jay B. Harlow [MVP - Outlook]** · Nov 21 '05, 10:53 AM

Re: How to Convert Byte Array to Int32 (Big-endian)

Charles,
Jon Skeet has a EndianBitConver ter at
http://www.yoda.arachsys.com/csharp/miscutil/ that works similar to
BitConverter but either Little-Endian or Big-Endian depending on which you
pick...

Its in C#, however you should be able to use directly as a class assembly,
or easily converted to VB.NET as the source is available...

Hope this helps
Jay

"Charles Law" <blank@nowhere. com> wrote in message
news:ODJHwi6$EH A.3988@TK2MSFTN GP11.phx.gbl...[color=blue]
>I thought this had come up before, but I now cannot find it.
>
> I have a byte array, such as
>
> Dim a() As Byte = {1, 2, 3, 4}
>
> I want to convert this to an Int32 = 01020304 (hex).
>
> If I use BitConverter, I get 04030201.
>
> Is there a built-in way to do this, or am I stuck with extracting and
> shifting each byte manually?
>
> TIA
>
> Charles
>
>[/color]

**Dennis** · Nov 21 '05, 10:55 AM

RE: How to Convert Byte Array to Int32 (Big-endian)

Here's a couple of functions that I use...probably a better way to do it but
it works:

Friend Function ConvIntegertoBy teArray(ByVal n As Long, ByVal lg As
Integer) As Byte()
'converts an integer to a byte array of length lg
Dim m() As Byte = New Byte(lg - 1) {}
Dim i, k As Integer
Dim h As String
h = Hex(n).PadLeft( 16, "0"c)
k = 16
For i = lg - 1 To 0 Step -1
k = k - 2
m(i) = CByte("&H" & h.Substring(k, 2))
Next
Return m
End Function

Public Function ConvByteArrayto Integer(ByVal b As Byte(), Optional ByVal
ln As Integer = 0, Optional ByVal sidx As Integer = 0) As Long
Dim i As Integer
Dim j, k As Long
If ln = 0 Then ln = UBound(b) + 1
ln = sidx + ln - 1
k = 1
j = CInt(b(ln))
For i = ln - 1 To sidx Step -1
k = 256 * k
j = j + k * b(i)
Next
Return j
End Function

"Charles Law" wrote:
[color=blue]
> I thought this had come up before, but I now cannot find it.
>
> I have a byte array, such as
>
> Dim a() As Byte = {1, 2, 3, 4}
>
> I want to convert this to an Int32 = 01020304 (hex).
>
> If I use BitConverter, I get 04030201.
>
> Is there a built-in way to do this, or am I stuck with extracting and
> shifting each byte manually?
>
> TIA
>
> Charles
>
>
>[/color]

**Charles Law** · Nov 21 '05, 10:55 AM

Re: How to Convert Byte Array to Int32 (Big-endian)

Hi Dennis

Thanks for the reply. As I said in a couple of other replies, it is not so
much the ability to manipulate the data by hand that eludes me, but the
native .NET way, if any. I suppose I am jut trying to avoid re-inventing the
wheel if, indeed, such a wheel exists.

Charles

"Dennis" <Dennis@discuss ions.microsoft. com> wrote in message
news:AA34156E-F28D-4F92-9C17-38DA9EFDC5E9@mi crosoft.com...[color=blue]
> Here's a couple of functions that I use...probably a better way to do it
> but
> it works:
>
> Friend Function ConvIntegertoBy teArray(ByVal n As Long, ByVal lg As
> Integer) As Byte()
> 'converts an integer to a byte array of length lg
> Dim m() As Byte = New Byte(lg - 1) {}
> Dim i, k As Integer
> Dim h As String
> h = Hex(n).PadLeft( 16, "0"c)
> k = 16
> For i = lg - 1 To 0 Step -1
> k = k - 2
> m(i) = CByte("&H" & h.Substring(k, 2))
> Next
> Return m
> End Function
>
> Public Function ConvByteArrayto Integer(ByVal b As Byte(), Optional
> ByVal
> ln As Integer = 0, Optional ByVal sidx As Integer = 0) As Long
> Dim i As Integer
> Dim j, k As Long
> If ln = 0 Then ln = UBound(b) + 1
> ln = sidx + ln - 1
> k = 1
> j = CInt(b(ln))
> For i = ln - 1 To sidx Step -1
> k = 256 * k
> j = j + k * b(i)
> Next
> Return j
> End Function
>
> "Charles Law" wrote:
>[color=green]
>> I thought this had come up before, but I now cannot find it.
>>
>> I have a byte array, such as
>>
>> Dim a() As Byte = {1, 2, 3, 4}
>>
>> I want to convert this to an Int32 = 01020304 (hex).
>>
>> If I use BitConverter, I get 04030201.
>>
>> Is there a built-in way to do this, or am I stuck with extracting and
>> shifting each byte manually?
>>
>> TIA
>>
>> Charles
>>
>>
>>[/color][/color]

**Charles Law** · Nov 21 '05, 10:55 AM

Re: How to Convert Byte Array to Int32 (Big-endian)

Hi Jay

Thanks for the link. I have had a look and I see that Jon uses, in essence,
the same approach that I have at present. I guess that is also how the .NET
little endian BitConverter method is coded under the covers, so it seems
that my best bet is just to wrap the functions I have a bit better and leave
it at that.

Cheers.

Charles

"Jay B. Harlow [MVP - Outlook]" <Jay_Harlow_MVP @msn.com> wrote in message
news:O38Z1$9$EH A.2012@TK2MSFTN GP15.phx.gbl...[color=blue]
> Charles,
> Jon Skeet has a EndianBitConver ter at
> http://www.yoda.arachsys.com/csharp/miscutil/ that works similar to
> BitConverter but either Little-Endian or Big-Endian depending on which you
> pick...
>
> Its in C#, however you should be able to use directly as a class assembly,
> or easily converted to VB.NET as the source is available...
>
> Hope this helps
> Jay
>
> "Charles Law" <blank@nowhere. com> wrote in message
> news:ODJHwi6$EH A.3988@TK2MSFTN GP11.phx.gbl...[color=green]
>>I thought this had come up before, but I now cannot find it.
>>
>> I have a byte array, such as
>>
>> Dim a() As Byte = {1, 2, 3, 4}
>>
>> I want to convert this to an Int32 = 01020304 (hex).
>>
>> If I use BitConverter, I get 04030201.
>>
>> Is there a built-in way to do this, or am I stuck with extracting and
>> shifting each byte manually?
>>
>> TIA
>>
>> Charles
>>
>>[/color]
>
>[/color]

**Jay B. Harlow [MVP - Outlook]** · Nov 21 '05, 10:59 AM

Re: How to Convert Byte Array to Int32 (Big-endian)

Charles,
I would expect yours & Jon's approach to be very similar.

My point is that Jon has done all the "leg work" & created "complete"
versions of the classes. In other words Why reinvent the wheel?

Hope this helps
Jay

"Charles Law" <blank@nowhere. com> wrote in message
news:%23ml44gCA FHA.3852@TK2MSF TNGP10.phx.gbl. ..[color=blue]
> Hi Jay
>
> Thanks for the link. I have had a look and I see that Jon uses, in
> essence, the same approach that I have at present. I guess that is also
> how the .NET little endian BitConverter method is coded under the covers,
> so it seems that my best bet is just to wrap the functions I have a bit
> better and leave it at that.
>
> Cheers.
>
> Charles
>
>
> "Jay B. Harlow [MVP - Outlook]" <Jay_Harlow_MVP @msn.com> wrote in message
> news:O38Z1$9$EH A.2012@TK2MSFTN GP15.phx.gbl...[color=green]
>> Charles,
>> Jon Skeet has a EndianBitConver ter at
>> http://www.yoda.arachsys.com/csharp/miscutil/ that works similar to
>> BitConverter but either Little-Endian or Big-Endian depending on which
>> you pick...
>>
>> Its in C#, however you should be able to use directly as a class
>> assembly, or easily converted to VB.NET as the source is available...
>>
>> Hope this helps
>> Jay
>>
>> "Charles Law" <blank@nowhere. com> wrote in message
>> news:ODJHwi6$EH A.3988@TK2MSFTN GP11.phx.gbl...[color=darkred]
>>>I thought this had come up before, but I now cannot find it.
>>>
>>> I have a byte array, such as
>>>
>>> Dim a() As Byte = {1, 2, 3, 4}
>>>
>>> I want to convert this to an Int32 = 01020304 (hex).
>>>
>>> If I use BitConverter, I get 04030201.
>>>
>>> Is there a built-in way to do this, or am I stuck with extracting and
>>> shifting each byte manually?
>>>
>>> TIA
>>>
>>> Charles
>>>
>>>[/color]
>>
>>[/color]
>
>[/color]

**Charles Law** · Nov 21 '05, 10:59 AM

Re: How to Convert Byte Array to Int32 (Big-endian)

Indeed. Fair point.

Thanks.

Charles

"Jay B. Harlow [MVP - Outlook]" <Jay_Harlow_MVP @msn.com> wrote in message
news:uzZE7BWAFH A.3436@TK2MSFTN GP09.phx.gbl...[color=blue]
> Charles,
> I would expect yours & Jon's approach to be very similar.
>
> My point is that Jon has done all the "leg work" & created "complete"
> versions of the classes. In other words Why reinvent the wheel?
>
> Hope this helps
> Jay
>
> "Charles Law" <blank@nowhere. com> wrote in message
> news:%23ml44gCA FHA.3852@TK2MSF TNGP10.phx.gbl. ..[color=green]
>> Hi Jay
>>
>> Thanks for the link. I have had a look and I see that Jon uses, in
>> essence, the same approach that I have at present. I guess that is also
>> how the .NET little endian BitConverter method is coded under the covers,
>> so it seems that my best bet is just to wrap the functions I have a bit
>> better and leave it at that.
>>
>> Cheers.
>>
>> Charles
>>
>>
>> "Jay B. Harlow [MVP - Outlook]" <Jay_Harlow_MVP @msn.com> wrote in message
>> news:O38Z1$9$EH A.2012@TK2MSFTN GP15.phx.gbl...[color=darkred]
>>> Charles,
>>> Jon Skeet has a EndianBitConver ter at
>>> http://www.yoda.arachsys.com/csharp/miscutil/ that works similar to
>>> BitConverter but either Little-Endian or Big-Endian depending on which
>>> you pick...
>>>
>>> Its in C#, however you should be able to use directly as a class
>>> assembly, or easily converted to VB.NET as the source is available...
>>>
>>> Hope this helps
>>> Jay
>>>
>>> "Charles Law" <blank@nowhere. com> wrote in message
>>> news:ODJHwi6$EH A.3988@TK2MSFTN GP11.phx.gbl...
>>>>I thought this had come up before, but I now cannot find it.
>>>>
>>>> I have a byte array, such as
>>>>
>>>> Dim a() As Byte = {1, 2, 3, 4}
>>>>
>>>> I want to convert this to an Int32 = 01020304 (hex).
>>>>
>>>> If I use BitConverter, I get 04030201.
>>>>
>>>> Is there a built-in way to do this, or am I stuck with extracting and
>>>> shifting each byte manually?
>>>>
>>>> TIA
>>>>
>>>> Charles
>>>>
>>>>
>>>
>>>[/color]
>>
>>[/color]
>
>[/color]

**Gerald Hernandez** · Nov 21 '05, 11:02 AM

Re: How to Convert Byte Array to Int32 (Big-endian)

"Charles Law" <blank@nowhere. com> wrote in message
news:ODJHwi6$EH A.3988@TK2MSFTN GP11.phx.gbl...[color=blue]
> I thought this had come up before, but I now cannot find it.
>
> I have a byte array, such as
>
> Dim a() As Byte = {1, 2, 3, 4}
>
> I want to convert this to an Int32 = 01020304 (hex).
>
> If I use BitConverter, I get 04030201.
>
> Is there a built-in way to do this, or am I stuck with extracting and
> shifting each byte manually?
>
> TIA
>
> Charles
>[/color]

You could try something like this:

Private Function Int32FromByteAr ray(ByVal BA() As Byte, ByVal
SwitchEndian As Boolean) As Integer
Dim outVal As Integer

outVal = BitConverter.To Int32(BA, 0)
If SwitchEndian = True Then
outVal = System.Net.IPAd dress.NetworkTo HostOrder(outVa l)
End If
Return outVal
End Function

NetworkToHostOr der - Big To Little Endian
HostToNetworkOr der - Little To Big Endian
Although in this case it makes no difference which one you choose as the end
result is the same.

Gerald

**Jay B. Harlow [MVP - Outlook]** · Nov 21 '05, 11:03 AM

Re: How to Convert Byte Array to Int32 (Big-endian)

Gerald,
Thanks, I was looking for NetworkToHostOr der & HostToNetworkOr der, when
Charles first asked, I just didn't remember which System.Net class they were
on. I was thinking Socket or something else...

Jay

"Gerald Hernandez" <Cablewizard@sp am_remove@Yahoo .com> wrote in message
news:%23NjhRqjA FHA.2792@TK2MSF TNGP15.phx.gbl. ..[color=blue]
>
> "Charles Law" <blank@nowhere. com> wrote in message
> news:ODJHwi6$EH A.3988@TK2MSFTN GP11.phx.gbl...[color=green]
>> I thought this had come up before, but I now cannot find it.
>>
>> I have a byte array, such as
>>
>> Dim a() As Byte = {1, 2, 3, 4}
>>
>> I want to convert this to an Int32 = 01020304 (hex).
>>
>> If I use BitConverter, I get 04030201.
>>
>> Is there a built-in way to do this, or am I stuck with extracting and
>> shifting each byte manually?
>>
>> TIA
>>
>> Charles
>>[/color]
>
> You could try something like this:
>
> Private Function Int32FromByteAr ray(ByVal BA() As Byte, ByVal
> SwitchEndian As Boolean) As Integer
> Dim outVal As Integer
>
> outVal = BitConverter.To Int32(BA, 0)
> If SwitchEndian = True Then
> outVal = System.Net.IPAd dress.NetworkTo HostOrder(outVa l)
> End If
> Return outVal
> End Function
>
> NetworkToHostOr der - Big To Little Endian
> HostToNetworkOr der - Little To Big Endian
> Although in this case it makes no difference which one you choose as the
> end
> result is the same.
>
> Gerald
>
>[/color]

**Gerald Hernandez** · Nov 21 '05, 11:03 AM

Re: How to Convert Byte Array to Int32 (Big-endian)

Yeah, it is buried pretty deep. It also seems they have some sort of
aversion to using the word Endian, so it makes it very difficult to find.

Gerald

"Jay B. Harlow [MVP - Outlook]" <Jay_Harlow_MVP @msn.com> wrote in message
news:e$q48rkAFH A.3836@tk2msftn gp13.phx.gbl...[color=blue]
> Gerald,
> Thanks, I was looking for NetworkToHostOr der & HostToNetworkOr der, when
> Charles first asked, I just didn't remember which System.Net class they[/color]
were[color=blue]
> on. I was thinking Socket or something else...
>
> Jay
>
> "Gerald Hernandez" <Cablewizard@sp am_remove@Yahoo .com> wrote in message
> news:%23NjhRqjA FHA.2792@TK2MSF TNGP15.phx.gbl. ..[color=green]
> >
> > "Charles Law" <blank@nowhere. com> wrote in message
> > news:ODJHwi6$EH A.3988@TK2MSFTN GP11.phx.gbl...[color=darkred]
> >> I thought this had come up before, but I now cannot find it.
> >>
> >> I have a byte array, such as
> >>
> >> Dim a() As Byte = {1, 2, 3, 4}
> >>
> >> I want to convert this to an Int32 = 01020304 (hex).
> >>
> >> If I use BitConverter, I get 04030201.
> >>
> >> Is there a built-in way to do this, or am I stuck with extracting and
> >> shifting each byte manually?
> >>
> >> TIA
> >>
> >> Charles
> >>[/color]
> >
> > You could try something like this:
> >
> > Private Function Int32FromByteAr ray(ByVal BA() As Byte, ByVal
> > SwitchEndian As Boolean) As Integer
> > Dim outVal As Integer
> >
> > outVal = BitConverter.To Int32(BA, 0)
> > If SwitchEndian = True Then
> > outVal = System.Net.IPAd dress.NetworkTo HostOrder(outVa l)
> > End If
> > Return outVal
> > End Function
> >
> > NetworkToHostOr der - Big To Little Endian
> > HostToNetworkOr der - Little To Big Endian
> > Although in this case it makes no difference which one you choose as the
> > end
> > result is the same.
> >
> > Gerald
> >
> >[/color]
>
>[/color]

**Charles Law** · Nov 21 '05, 11:03 AM

Re: How to Convert Byte Array to Int32 (Big-endian)

Hi Gerald

That's just the ticket. Thanks.

Charles

"Gerald Hernandez" <Cablewizard@sp am_remove@Yahoo .com> wrote in message
news:%23NjhRqjA FHA.2792@TK2MSF TNGP15.phx.gbl. ..[color=blue]
>
> "Charles Law" <blank@nowhere. com> wrote in message
> news:ODJHwi6$EH A.3988@TK2MSFTN GP11.phx.gbl...[color=green]
>> I thought this had come up before, but I now cannot find it.
>>
>> I have a byte array, such as
>>
>> Dim a() As Byte = {1, 2, 3, 4}
>>
>> I want to convert this to an Int32 = 01020304 (hex).
>>
>> If I use BitConverter, I get 04030201.
>>
>> Is there a built-in way to do this, or am I stuck with extracting and
>> shifting each byte manually?
>>
>> TIA
>>
>> Charles
>>[/color]
>
> You could try something like this:
>
> Private Function Int32FromByteAr ray(ByVal BA() As Byte, ByVal
> SwitchEndian As Boolean) As Integer
> Dim outVal As Integer
>
> outVal = BitConverter.To Int32(BA, 0)
> If SwitchEndian = True Then
> outVal = System.Net.IPAd dress.NetworkTo HostOrder(outVa l)
> End If
> Return outVal
> End Function
>
> NetworkToHostOr der - Big To Little Endian
> HostToNetworkOr der - Little To Big Endian
> Although in this case it makes no difference which one you choose as the
> end
> result is the same.
>
> Gerald
>
>[/color]

How to Convert Byte Array to Int32 (Big-endian)

How to Convert Byte Array to Int32 (Big-endian)

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