binary writer question

[DBC User]

I have a binary writer and when I write a unsigned int I was expecting
it to write 4 bytes but it is writing 5 bytes and last last byte being
0B. Also when I write string it is adding byte 01 at the, here is the
one liner I am using

writer.Write(field.Substring(0, length)) //where field is string

Any idea why I am getting OB in the unsigned int field and 01 between
two string writes??

Thanks.

 

[Ignacio Machin \( .NET/ C# MVP \)]

Hi,

You should define the encoding of the string you are going to write. If for
example you use unicode you will get 2 bytes (16 bits) per character.If you
use UTF7/8 you will get 8 bits per character.

 

[Jon Skeet [C# MVP]]

I have a binary writer and when I write a unsigned int I was expecting
it to write 4 bytes but it is writing 5 bytes and last last byte being
0B.

Could you post a short but complete program which demonstrates the
problem?

See http://www.pobox.com/~skeet/csharp/complete.html for details of
what I mean by that.

Also when I write string it is adding byte 01 at the, here is the
one liner I am using

writer.Write(field.Substring(0, length)) //where field is string

Any idea why I am getting OB in the unsigned int field and 01 between
two string writes??

Look at the documentation for BinaryWriter.Write(string) for an
explanation of this. (It won't always be 1 - it will be the length in
bytes.)

Admittedly the documentation is incorrect - it claims that it writes
the length in characters as a four byte integer; in fact it writes a
7-bit-encoded integer being the length of the encoded string in
*bytes*.

 

[DBC User]

Thanks both. I figured out the problem. I changed the long to uint and
that took care of the integer problem.
Regarding the string, I changed it to character array and it worked
fine.

Thanks again for the help.