Creating Buffer

[BMax]

Hello
I want to create a byte[] and use it as a buffer, then access it with a
binaryreader or streamreader.
what is important is to be able to read different variables form that, like
readint16, readbytes(),rea dint32.... . so if there is a method to read byte
arrays that would also help.
(i couldn' use convert class )
is that possible? if yes how?

[Dennis Myrén]

You may instantiate a System.IO.Binar yReader/Writer by passing a
MemoryStream
(which in turn is instantiated with the buffer you want to work with)
to the constructor as the base stream.

Have a look at System.BitConve rter for conversions from byte sequences into
primitive data types.
--
Regards,
Dennis JD Myrén
Oslo Kodebureau
"BMax" <sd@asd.c> wrote in message
news:uw******** ******@TK2MSFTN GP10.phx.gbl...

Hello
I want to create a byte[] and use it as a buffer, then access it with a
binaryreader or streamreader.
what is important is to be able to read different variables form that, like readint16, readbytes(),rea dint32.... . so if there is a method to read byte arrays that would also help.
(i couldn' use convert class )
is that possible? if yes how?

[BMax]

Thanks.
didn't use MemoryStream , BitConvertor solved all problems.
But for a better code, do you know how to creat template prototype for
classes? in c# I mean. then i can pass the buffer to a function with desired
data type and it returns a TypeOf object?
"Dennis Myrén" <de****@oslokb. no> wrote in message
news:_O******** **********@news 4.e.nsc.no...

You may instantiate a System.IO.Binar yReader/Writer by passing a
MemoryStream
(which in turn is instantiated with the buffer you want to work with)
to the constructor as the base stream.

Have a look at System.BitConve rter for conversions from byte sequences into primitive data types.
--
Regards,
Dennis JD Myrén
Oslo Kodebureau
"BMax" <sd@asd.c> wrote in message
news:uw******** ******@TK2MSFTN GP10.phx.gbl...

Hello
I want to create a byte[] and use it as a buffer, then access it with a
binaryreader or streamreader.
what is important is to be able to read different variables form that,

like

readint16, readbytes(),rea dint32.... . so if there is a method to read

byte

arrays that would also help.
(i couldn' use convert class )
is that possible? if yes how?

[Dennis Myrén]

I suppose you mean something like:
int i = (int) GetPrimitive(my Buffer, typeof(int));
object GetPrimitive ( byte sourceBuffer, System.Type returnType )
{
....
}

You could do it like that, but i think you will gain performance
and efficiency by avoiding the type casts that you must then do.

Did i understand your question correct?
If not, let me know, and i will try once again to help you.
--
Regards,
Dennis JD Myrén
Oslo Kodebureau
"BMax" <sd@asd.c> wrote in message
news:%2******** ********@tk2msf tngp13.phx.gbl. ..

Thanks.
didn't use MemoryStream , BitConvertor solved all problems.
But for a better code, do you know how to creat template prototype for
classes? in c# I mean. then i can pass the buffer to a function with desired data type and it returns a TypeOf object?
"Dennis Myrén" <de****@oslokb. no> wrote in message
news:_O******** **********@news 4.e.nsc.no...

You may instantiate a System.IO.Binar yReader/Writer by passing a
MemoryStream
(which in turn is instantiated with the buffer you want to work with)
to the constructor as the base stream.

Have a look at System.BitConve rter for conversions from byte sequences

into

primitive data types.
--
Regards,
Dennis JD Myrén
Oslo Kodebureau
"BMax" <sd@asd.c> wrote in message
news:uw******** ******@TK2MSFTN GP10.phx.gbl...

Hello
I want to create a byte[] and use it as a buffer, then access it with a binaryreader or streamreader.
what is important is to be able to read different variables form that,

like

readint16, readbytes(),rea dint32.... . so if there is a method to read

byte

arrays that would also help.
(i couldn' use convert class )
is that possible? if yes how?

[Bmax]

Not really.
what I asked was a function that can return deferent types depends on
parameters.
like :
myfunction(buff er buff , short i) //returns a short
myfunction(buff er buff , myobject p)//returns myobject
for this I defined different version of a same function within a class:

private int func(buffer, int i){}
private byte[] func(buffer,byt e[]) {}
private sting ....

so in main class i just pass buffer and desired type to function and it
returns the same type.
but can i avoid writing different version of the same function? here the
template thing can help. then i don't need to handle all types. your code
will work, but is there another way without type cast?
Thank you very much for your helps, it really helps.

"Dennis Myrén" <de****@oslokb. no> wrote in message
news:2W******** **********@news 2.e.nsc.no...

I suppose you mean something like:
int i = (int) GetPrimitive(my Buffer, typeof(int));
object GetPrimitive ( byte sourceBuffer, System.Type returnType )
{
...
}

You could do it like that, but i think you will gain performance
and efficiency by avoiding the type casts that you must then do.

Did i understand your question correct?
If not, let me know, and i will try once again to help you.
--
Regards,
Dennis JD Myrén
Oslo Kodebureau
"BMax" <sd@asd.c> wrote in message
news:%2******** ********@tk2msf tngp13.phx.gbl. ..

Thanks.
didn't use MemoryStream , BitConvertor solved all problems.
But for a better code, do you know how to creat template prototype for
classes? in c# I mean. then i can pass the buffer to a function with desired

data type and it returns a TypeOf object?
"Dennis Myrén" <de****@oslokb. no> wrote in message
news:_O******** **********@news 4.e.nsc.no...

You may instantiate a System.IO.Binar yReader/Writer by passing a
MemoryStream
(which in turn is instantiated with the buffer you want to work with)
to the constructor as the base stream.

Have a look at System.BitConve rter for conversions from byte sequences

into

primitive data types.
--
Regards,
Dennis JD Myrén
Oslo Kodebureau
"BMax" <sd@asd.c> wrote in message
news:uw******** ******@TK2MSFTN GP10.phx.gbl...
> Hello
> I want to create a byte[] and use it as a buffer, then access it with a

> binaryreader or streamreader.
> what is important is to be able to read different variables form

that, like
> readint16, readbytes(),rea dint32.... . so if there is a method to read byte
> arrays that would also help.
> (i couldn' use convert class )
> is that possible? if yes how?
>
>

[Dennis Myrén]

Ok, now I understand;
you have to do it that way because C# does not allow you
to have overloaded methods with the same parameters that only differ in
return type.
So the last parameters of these functions are really just dummy parameters
to get around that
overloading limitation.

My advice on this one is to use output parameters.
That way you can use the same function names, and you may gain some
efficiency
and clearness by not having to send a dummy parameter to indicate the return
type.
You define an output parameter by the keyword "out".

This is how you do it:

private void getPrimitive ( byte [] sourceBuffer, int offset, out int
result )
{
result = System.BitConve rter.ToInt32(so urceBuffer, offset);
}

private void getPrimitive ( byte [] sourceBuffer, int offset, out float
result )
{
result = System.BitConve rter.ToSingle(s ourceBuffer, offset);
}

private void getPrimitive ( byte [] sourceBuffer, int offset, out string
result )
{
result = System.BitConve rter.ToString(s ourceBuffer, offset);
}

Now you can call this functions with only necessary parameters:

int resultInt32; // Initialization not needed as it will be passed as out
parameter.
float resultSingle; // Initialization not needed as it will be passed as out
parameter.
string resultString; // Initialization not needed as it will be passed as
out parameter.
byte [] buff = LoadBuffer(); // Should contain your working byte buffer.

// Get a string from the buffer at position 2.
// We must use the out keyword even in the calling context.
getPrimitive(bu ff, 2, out resultString);

// Get an Int32 from the buffer at position 8:
// We must use the out keyword even in the calling context.
getPrimitive(bu ff, 8, out resultInt32);

// Get a Single from the buffer at position 82:
// We must use the out keyword even in the calling context.
getPrimitive(bu ff, 82, out resultSingle);
--
Regards,
Dennis JD Myrén
Oslo Kodebureau
"Bmax" <BluemanREMOVET HISANDPUTATSIGH Ngmail.com> wrote in message
news:Oc******** ******@TK2MSFTN GP10.phx.gbl...

Not really.
what I asked was a function that can return deferent types depends on
parameters.
like :
myfunction(buff er buff , short i) //returns a short
myfunction(buff er buff , myobject p)//returns myobject
for this I defined different version of a same function within a class:

private int func(buffer, int i){}
private byte[] func(buffer,byt e[]) {}
private sting ....

so in main class i just pass buffer and desired type to function and it
returns the same type.
but can i avoid writing different version of the same function? here the
template thing can help. then i don't need to handle all types. your code
will work, but is there another way without type cast?
Thank you very much for your helps, it really helps.

"Dennis Myrén" <de****@oslokb. no> wrote in message
news:2W******** **********@news 2.e.nsc.no...

I suppose you mean something like:
int i = (int) GetPrimitive(my Buffer, typeof(int));
object GetPrimitive ( byte sourceBuffer, System.Type returnType )
{
...
}

You could do it like that, but i think you will gain performance
and efficiency by avoiding the type casts that you must then do.

Did i understand your question correct?
If not, let me know, and i will try once again to help you.
--
Regards,
Dennis JD Myrén
Oslo Kodebureau
"BMax" <sd@asd.c> wrote in message
news:%2******** ********@tk2msf tngp13.phx.gbl. ..

Thanks.
didn't use MemoryStream , BitConvertor solved all problems.
But for a better code, do you know how to creat template prototype for
classes? in c# I mean. then i can pass the buffer to a function with

desired

data type and it returns a TypeOf object?
"Dennis Myrén" <de****@oslokb. no> wrote in message
news:_O******** **********@news 4.e.nsc.no...
> You may instantiate a System.IO.Binar yReader/Writer by passing a
> MemoryStream
> (which in turn is instantiated with the buffer you want to work with) > to the constructor as the base stream.
>
> Have a look at System.BitConve rter for conversions from byte sequences into
> primitive data types.
>
>
> --
> Regards,
> Dennis JD Myrén
> Oslo Kodebureau
> "BMax" <sd@asd.c> wrote in message
> news:uw******** ******@TK2MSFTN GP10.phx.gbl...
> > Hello
> > I want to create a byte[] and use it as a buffer, then access it with

a

> > binaryreader or streamreader.
> > what is important is to be able to read different variables form

that, > like
> > readint16, readbytes(),rea dint32.... . so if there is a method to read > byte
> > arrays that would also help.
> > (i couldn' use convert class )
> > is that possible? if yes how?
> >
> >
>
>

[Blmn]

Bingo!
I didn't know anything about this Output parameter.now I can optimize my
code.
don't even know how to thank you :)
Tak So mycket.

"Dennis Myrén" <de****@oslokb. no> wrote in message
news:Kz******** **********@news 2.e.nsc.no...

Ok, now I understand;
you have to do it that way because C# does not allow you
to have overloaded methods with the same parameters that only differ in
return type.
So the last parameters of these functions are really just dummy parameters
to get around that
overloading limitation.

My advice on this one is to use output parameters.
That way you can use the same function names, and you may gain some
efficiency
and clearness by not having to send a dummy parameter to indicate the
return
type.
You define an output parameter by the keyword "out".

This is how you do it:

private void getPrimitive ( byte [] sourceBuffer, int offset, out int
result )
{
result = System.BitConve rter.ToInt32(so urceBuffer, offset);
}

private void getPrimitive ( byte [] sourceBuffer, int offset, out float
result )
{
result = System.BitConve rter.ToSingle(s ourceBuffer, offset);
}

private void getPrimitive ( byte [] sourceBuffer, int offset, out string
result )
{
result = System.BitConve rter.ToString(s ourceBuffer, offset);
}

Now you can call this functions with only necessary parameters:

int resultInt32; // Initialization not needed as it will be passed as out
parameter.
float resultSingle; // Initialization not needed as it will be passed as
out
parameter.
string resultString; // Initialization not needed as it will be passed as
out parameter.
byte [] buff = LoadBuffer(); // Should contain your working byte buffer.

// Get a string from the buffer at position 2.
// We must use the out keyword even in the calling context.
getPrimitive(bu ff, 2, out resultString);

// Get an Int32 from the buffer at position 8:
// We must use the out keyword even in the calling context.
getPrimitive(bu ff, 8, out resultInt32);

// Get a Single from the buffer at position 82:
// We must use the out keyword even in the calling context.
getPrimitive(bu ff, 82, out resultSingle);
--
Regards,
Dennis JD Myrén
Oslo Kodebureau
"Bmax" <BluemanREMOVET HISANDPUTATSIGH Ngmail.com> wrote in message
news:Oc******** ******@TK2MSFTN GP10.phx.gbl...

Not really.
what I asked was a function that can return deferent types depends on
parameters.
like :
myfunction(buff er buff , short i) //returns a short
myfunction(buff er buff , myobject p)//returns myobject
for this I defined different version of a same function within a class:

private int func(buffer, int i){}
private byte[] func(buffer,byt e[]) {}
private sting ....

so in main class i just pass buffer and desired type to function and it
returns the same type.
but can i avoid writing different version of the same function? here the
template thing can help. then i don't need to handle all types. your code
will work, but is there another way without type cast?
Thank you very much for your helps, it really helps.

"Dennis Myrén" <de****@oslokb. no> wrote in message
news:2W******** **********@news 2.e.nsc.no...

> I suppose you mean something like:
> int i = (int) GetPrimitive(my Buffer, typeof(int));
> object GetPrimitive ( byte sourceBuffer, System.Type returnType )
> {
> ...
> }
>
> You could do it like that, but i think you will gain performance
> and efficiency by avoiding the type casts that you must then do.
>
> Did i understand your question correct?
> If not, let me know, and i will try once again to help you.
>
>
> --
> Regards,
> Dennis JD Myrén
> Oslo Kodebureau
> "BMax" <sd@asd.c> wrote in message
> news:%2******** ********@tk2msf tngp13.phx.gbl. ..
> > Thanks.
> > didn't use MemoryStream , BitConvertor solved all problems.
> > But for a better code, do you know how to creat template prototype
> > for
> > classes? in c# I mean. then i can pass the buffer to a function with
> desired
> > data type and it returns a TypeOf object?
> >
> >
> > "Dennis Myrén" <de****@oslokb. no> wrote in message
> > news:_O******** **********@news 4.e.nsc.no...
> > > You may instantiate a System.IO.Binar yReader/Writer by passing a
> > > MemoryStream
> > > (which in turn is instantiated with the buffer you want to work with) > > > to the constructor as the base stream.
> > >
> > > Have a look at System.BitConve rter for conversions from byte sequences > > into
> > > primitive data types.
> > >
> > >
> > > --
> > > Regards,
> > > Dennis JD Myrén
> > > Oslo Kodebureau
> > > "BMax" <sd@asd.c> wrote in message
> > > news:uw******** ******@TK2MSFTN GP10.phx.gbl...
> > > > Hello
> > > > I want to create a byte[] and use it as a buffer, then access it

with

> a
> > > > binaryreader or streamreader.
> > > > what is important is to be able to read different variables form

that,

> > > like
> > > > readint16, readbytes(),rea dint32.... . so if there is a method to

read

> > > byte
> > > > arrays that would also help.
> > > > (i couldn' use convert class )
> > > > is that possible? if yes how?
> > > >
> > > >
> > >
> > >
> >
> >
>
>