I note that you can null teminate a string by adding controlchar.nul l.
Is there a way of adding a null to a Buffer of Bytes and converting it to a
string.
I have packets coming in from a serial ports as bytes and some of these
represent strings. (Like the Packed BCD date/time stamp etc).
At present I read through each Byte and convert to char and append to a
string.
In C, you can simply place a null at any position in he buffer and copy the
entire buffer to a string variable. Can this be dome in VB .NET ?
Thanks 5 4164
David,
"David" <da***@orbitcom s.com> schrieb: Is there a way of adding a null to a Buffer of Bytes and converting it to a string.
I have packets coming in from a serial ports as bytes and some of these represent strings. (Like the Packed BCD date/time stamp etc).
At present I read through each Byte and convert to char and append to a string.
Take a look at the 'System.Text.En coding.{encodin g name}.GetString ' methods.
These methods can be used to convert data stored in a byte array to a string
by using a specific encoding.
In C, you can simply place a null at any position in he buffer and copy the entire buffer to a string variable. Can this be dome in VB .NET ?
Notice that in .NET strings are /not/ null-terminated. In addition to that,
strings are immutable, which means that you cannot change a string's length
without creating a new string. If you want a string to be null-terminated,
simply append 'ControlChars.N ullChar' to the string. When using p/invoke,
null-termination is not necessary because it's done by the marshaller
automatically.
--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://dotnet.mvps.org/dotnet/faqs/>
Thanks for that.
I do not require a null terminted string. This was a hangover from C that I
thought was required.
If I can simply select a start position and number of characters in the
bytes array to convert to a string, this would be excellent.
"Herfried K. Wagner [MVP]" <hi************ ***@gmx.at> wrote in message
news:%2******** ********@TK2MSF TNGP09.phx.gbl. .. David,
"David" <da***@orbitcom s.com> schrieb: Is there a way of adding a null to a Buffer of Bytes and converting it
to a string.
I have packets coming in from a serial ports as bytes and some of these represent strings. (Like the Packed BCD date/time stamp etc).
At present I read through each Byte and convert to char and append to a string. Take a look at the 'System.Text.En coding.{encodin g name}.GetString '
methods. These methods can be used to convert data stored in a byte array to a
string by using a specific encoding.
In C, you can simply place a null at any position in he buffer and copy the entire buffer to a string variable. Can this be dome in VB .NET ? Notice that in .NET strings are /not/ null-terminated. In addition to
that, strings are immutable, which means that you cannot change a string's
length without creating a new string. If you want a string to be
null-terminated, simply append 'ControlChars.N ullChar' to the string. When using p/invoke, null-termination is not necessary because it's done by the marshaller automatically.
-- M S Herfried K. Wagner M V P <URL:http://dotnet.mvps.org/> V B <URL:http://dotnet.mvps.org/dotnet/faqs/>
David,
"David" <da***@orbitcom s.com> schrieb: If I can simply select a start position and number of characters in the bytes array to convert to a string, this would be excellent.
There is a 'GetString(Byte (), Integer, Integer)' overload that does what you
want to archieve.
--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://dotnet.mvps.org/dotnet/faqs/>
I have a similar problem. I am calling a C API on a PocketPC using VB.NET.
The function declaration is
Declare Function newVo Lib "Test.dll" Alias "newVo" _
(ByRef hVo As IntPtr, ByVal hInstance As integer, ByVal
ByVal vo() As Byte, ByVal Rate As UInt32, ByVal coding
As String) As Integer
I call it like this.
Dim vo() As Byte
vo = Encoding.ASCII. GetBytes("Test" )
ret = api.ttsNewVo(hV o, hInstance.ToInt 32, vo, 16000, "L")
In have a log file enabled and it should list "Test.vde", but there is a
binary 04 and 08 character following "Test" and before the ".vde". Do I need
to NULL terminate the ASCII byte array or where are these extra characters
coming from?
What is the best way of adding a null to a Buffer of Bytes.
Thanks
"David" wrote: I note that you can null teminate a string by adding controlchar.nul l.
Is there a way of adding a null to a Buffer of Bytes and converting it to a string.
I have packets coming in from a serial ports as bytes and some of these represent strings. (Like the Packed BCD date/time stamp etc).
At present I read through each Byte and convert to char and append to a string.
In C, you can simply place a null at any position in he buffer and copy the entire buffer to a string variable. Can this be dome in VB .NET ?
Thanks
You can Null terminate a byte array by
vo = Encoding.ASCII. GetBytes("Test" )
ReDim Preserve vo(vo.Length)
"smaggi" wrote: I have a similar problem. I am calling a C API on a PocketPC using VB.NET. The function declaration is
Declare Function newVo Lib "Test.dll" Alias "newVo" _ (ByRef hVo As IntPtr, ByVal hInstance As integer, ByVal ByVal vo() As Byte, ByVal Rate As UInt32, ByVal coding As String) As Integer
I call it like this.
Dim vo() As Byte vo = Encoding.ASCII. GetBytes("Test" ) ret = api.ttsNewVo(hV o, hInstance.ToInt 32, vo, 16000, "L")
In have a log file enabled and it should list "Test.vde", but there is a binary 04 and 08 character following "Test" and before the ".vde". Do I need to NULL terminate the ASCII byte array or where are these extra characters coming from? What is the best way of adding a null to a Buffer of Bytes.
Thanks
"David" wrote:
I note that you can null teminate a string by adding controlchar.nul l.
Is there a way of adding a null to a Buffer of Bytes and converting it to a string.
I have packets coming in from a serial ports as bytes and some of these represent strings. (Like the Packed BCD date/time stamp etc).
At present I read through each Byte and convert to char and append to a string.
In C, you can simply place a null at any position in he buffer and copy the entire buffer to a string variable. Can this be dome in VB .NET ?
Thanks This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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