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For a little something I'm experimenting with, I'd like to be able to (binary) read and write various types of object, like I can with C. The biggest need currently is byte, long, and Guid, but I'd like a more general solution.
BinaryReader and -Writer won't do it; they only support a few types (not Guid) and (apparently) not read/write.
So so far I've been working with a FileStream. At this time, I can do byte (which is built into FileStream), and long and Guid via "unsafe" code.
The problem has been in making generic read and write methods:
T Read<T>()
void Write<T>( T Value )
C# doesn't want to make a pointer to a generic type. I got around that (I think) by using a GCHandle, and maybe that's the best I can do.
Anyway... I have a sneaking suspicion that this has been solved before. Shouldn't others have run into the same need?
Does anyone here have information on such a beast?
(If not, I'll write an article when I'm done.)
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I know you don't like Convert class much, however this seems an opportunity for using BitConverter[^] rather than unsafe code.
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Luc Pattyn wrote: I know you don't like Convert class much
Is it that obvious?
I don't see Guid, or DateTime, or other types I may want in the future.
Guid has a ToByteArray method I tried out.
But I also need to convert back from byte array to the type as well.
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I remember some years ago I tried something similar just for fun. I used reflection recursively to reduce the object to its minimal parts and then writting its binary data was far easy.
For example, Guid data is hold by some private fields: _a (int); _b and _c (short); _d, _e, _f, _g, _h, _i, _j and _k (byte). So, to binary write a Guid I retrieved its private fields (which are of, let's say, simple types) and values through reflecton and then wrote the data to the stream. Deserializing was the reverse process.
Recursion had to be used when the fields were not of simple types.
It was quite tricky (and funny) to develop that, but after making it work I lost interest on it and, unfortunately, I lost the code as well, but maybe this suggestion can help.
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That might be needed for classes and some structs, but I don't plan on going that far at this time.
What I have now works for Guids and I'll exercise it some more today.
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If you are only doing your own data structures and are willing to use unsafe code. Marshal.StructureToPtr will give you that old school C feel. However I think just using binary reader and writer were faster.
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Andy Brummer wrote: binary reader and writer
That's not read and write.
What I have now supports random access, plus:
[PIEBALD.Attributes.EnumDefaultValue((byte)SupportedType.Unknown)]
public enum SupportedType : byte
{
Unknown
,
[PIEBALD.Attributes.TypeTransmogrifierAttribute(typeof(System.Byte))]
Byte
,
[PIEBALD.Attributes.TypeTransmogrifierAttribute(typeof(System.SByte))]
SByte
,
[PIEBALD.Attributes.TypeTransmogrifierAttribute(typeof(System.Int16))]
Int16
,
[PIEBALD.Attributes.TypeTransmogrifierAttribute(typeof(System.UInt16))]
UInt16
,
[PIEBALD.Attributes.TypeTransmogrifierAttribute(typeof(System.Int32))]
Int32
,
[PIEBALD.Attributes.TypeTransmogrifierAttribute(typeof(System.UInt32))]
UInt32
,
[PIEBALD.Attributes.TypeTransmogrifierAttribute(typeof(System.Int64))]
Int64
,
[PIEBALD.Attributes.TypeTransmogrifierAttribute(typeof(System.UInt64))]
UInt64
,
[PIEBALD.Attributes.TypeTransmogrifierAttribute(typeof(System.Single))]
Single
,
[PIEBALD.Attributes.TypeTransmogrifierAttribute(typeof(System.Double))]
Double
,
[PIEBALD.Attributes.TypeTransmogrifierAttribute(typeof(System.Decimal))]
Decimal
,
[PIEBALD.Attributes.TypeTransmogrifierAttribute(typeof(System.Guid))]
Guid
,
[PIEBALD.Attributes.TypeTransmogrifierAttribute(typeof(System.Boolean))]
Boolean
,
[PIEBALD.Attributes.TypeTransmogrifierAttribute(typeof(System.DateTime))]
DateTime
,
[PIEBALD.Attributes.TypeTransmogrifierAttribute(typeof(System.Char))]
Char
,
[PIEBALD.Attributes.TypeTransmogrifierAttribute(typeof(System.String))]
String
,
[PIEBALD.Attributes.TypeTransmogrifierAttribute(typeof(System.Enum))]
Enum
}
Oh, and if the type is unknown, it tries the GCHandle technique anyway -- which works for some other types.
modified on Sunday, November 7, 2010 10:54 AM
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I am writting a code in vb.net, How can i convert it into the similar code in c#?
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you are new here, and should read the forum guidelines; see "how to get an answer" on this page.
"help needed" is not informative. That is a reason why your earlier posts got down-voted.
why do you write in VB.NET if you need C#? do you know C# at all? if not, forget it (i.e. study it thoroughly or don't use it at all).
there are converters, some big, good, expensive; and some small and free, like this one[^].
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you must learn C#, there is no other solution to your problem!
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Isn't there? What about the automatic code converters? How do you think that Reflector works?
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Reflector decompiles an assembly to .net language C# or VB.net or MSIL,
and the "there is no solution" means "to encourage him to learn c#" 
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Then that's what you should say to the OP. As he's inexperienced, he may just take you at your word.
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See the below links
http://www.developerfusion.com/tools/convert/vb-to-csharp/
http://www.dotnetspider.com/convert/Vb-To-Csharp.aspx
these are the online tools for convert code Vb.Net to C#.
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If you are using VS2008, you can download the MoXAML PowerToys referred to in my sig, and run the BabelCode functionality there to convert from C# to VB.NET or vice versa.
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Hi All!
In C# ,VS2010 :
Let's say I assign a tag-property for a TreeNode-object with an IShellFolder-object. What do VS really store in the Tag-property? Do the framework hide all the gruesome memoryhandling for me and internally just store a pointer to the IShellFolder-object, or do the memoryuse just increase the further I recurse into the Folder-tree?
I have been programming for some years, but have no formal education on computing, except for some MCP-courses.
Someone knows what I should read or some good sources for explaining this?
TIA, Load_error
------
On Error Goto Hell
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IMO you should learn a language, or any new technology, from a book you buy and study; and study again one year later. Memory management is pretty automatic in .NET
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Well, to reduce the memory-footprint is not just a matter of reading, it is (together with memory-leaking and multithreading) some of the stuff I find most difficult to debug (like the half-assed CLR-implementation GC, what does it really collect?!? What should I release with Marshalling, etc ?!?).
Desktop developers have got a christmaspresent from MS every time they release a new OS, like they think "how to break any existing code" every time...
I started out in the VB3 days (Win95 / -stuff), and seem to re-create libraries for (almost) the same things over and over again.
Your answer did not help much, either...
Regards, Load_error
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can some one help me to save the email sent by a user to my email id, in a sql server 2005 database.
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Maybe. Have you actually tried something? If so, what have you tried and where are you experiencing problems?
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