I need to read binary data file written by C++ program, using my C#
application.
How do i marshal the bytes i read with my C# code to .NET types.
The data is numbers (integers float doubles etc..) and strings.
I looked at the Marshal class but did not know how to use it with file.
Please add few code lines.
Thanks alot
Jan 19 '06
14  4154 
Willy,
I don't know if you notice but the binary data file was written by C++.
I am not sure that type bits written into the binary file, using C++,
is the same as type bits writen using .NET.
Vertilka
"Vertilka" <ve******@gmail .com> wrote in message
news:11******** **************@ g47g2000cwa.goo glegroups.com.. .
| Willy,
|
| I don't know if you notice but the binary data file was written by C++.
| I am not sure that type bits written into the binary file, using C++,
| is the same as type bits writen using .NET.
|
| Vertilka
|
This is the first thing you should try to find out, right? You can't read a
file if you don't know the data types used in the file.
You said it's a binary data file, where is the data file written? On what
system (Windows, Unix, mainframe). Things to look for are endianess, char
encoding and eventual padding. If the file is written on Windows system,
then you are almost certain that the binary and floating point types are
exactly the same, more problematic are the char arrays and strings (which
are basically the same as arrays of chars once serialized), here you have to
know the encoding used so that you know how to read and to decode them.
Willy.
Vertilka <ve******@gmail .com> wrote: Jon, Nicholas,
Thanks for your answers.
Can you both post code snippets.
Lets say that i have 8 bytes that i want to get a bouble from them.
double d = BitConverter.In t64BitsToDouble (Marshall.ReadI nt64(...));
Of course, that assumes it's in the right format. Worth trying to see.
--
Jon Skeet - <sk***@pobox.co m> http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too
again, friends...
i have a byte array with data.
i know for example that the first 8 bytes are double.
now.
with this line:
double d = BitConverter.In t64BitsToDouble (Marshall.ReadI nt64(...));
i need to give intptr to ReadInt64.
how to convert byte array to intptr
thanks.
Vertilka <ve******@gmail .com> wrote: again, friends...
i have a byte array with data.
i know for example that the first 8 bytes are double.
In that case I'm not sure where the Marshal class comes in at all.
That's what's been confusing us, I suspect.
now.
with this line:
double d = BitConverter.In t64BitsToDouble (Marshall.ReadI nt64(...));
i need to give intptr to ReadInt64.
how to convert byte array to intptr
Use BitConverter.To Double then.
--
Jon Skeet - <sk***@pobox.co m> http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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