Hi,
I'm new to c# an missing functions like memcmp and memcpy from C.
Is there something similar ?
cu
Alex 7 12715
Alex,
To copy value types (such as structures) what you need to do is just using
the assignment operator; this will make a shallow copy of the struct
members.
I would say almost all reference types that represent block of data in the
memory (e.g. arrays and collections) CopyTo
method. Actually this method is defined in the ICollection interface.
The other way you can create a copy of an object's data is to call Clone if
the type implements ICloneable interface.
In addition there is a method defined on the level of the Object class
called MemberwiseClone. This mehod creates a shallow copy of the object. The
method is protected and is meant to be used for implementing *clone*.
As far as string comparison goes you can use the CompareXXXX methods of
the String class.
--
HTH
Stoitcho Goutsev (100)
"Alex Stark" <st****@online.nospam> wrote in message
news:%2****************@TK2MSFTNGP10.phx.gbl... Hi,
I'm new to c# an missing functions like memcmp and memcpy from C. Is there something similar ?
cu Alex
Hi Stoicho,
thanks for your answer. But I don't really understand what you mean.
All I have is a bytearray b1 and I want to kow is, if a second bytearray b2
is part somewhere in b1.
In C the code is a simple :
int section_init(uchar *tra, int tralen)
{
int i, j=0;
uchar buf[256];
if (memcmp(tra+4, "LOCKED", 6))
return(0);
...................
}
How is such a simple think in C# realizable ? Sure, I can build a string
and in this case this will be the easiest way.....but I think, there are
some
more complex issues, where string conversation will not the best way.
Thanks for your help !!!!!!!!!!!
Alex
"Stoitcho Goutsev (100)" <10*@100.com> schrieb im Newsbeitrag
news:O6**************@TK2MSFTNGP12.phx.gbl... Alex,
To copy value types (such as structures) what you need to do is just using the assignment operator; this will make a shallow copy of the struct members.
I would say almost all reference types that represent block of data in the memory (e.g. arrays and collections) CopyTo method. Actually this method is defined in the ICollection interface.
The other way you can create a copy of an object's data is to call Clone if the type implements ICloneable interface.
In addition there is a method defined on the level of the Object class called MemberwiseClone. This mehod creates a shallow copy of the object. The method is protected and is meant to be used for implementing *clone*.
As far as string comparison goes you can use the CompareXXXX methods of the String class.
-- HTH Stoitcho Goutsev (100)
"Alex Stark" <st****@online.nospam> wrote in message news:%2****************@TK2MSFTNGP10.phx.gbl... Hi,
I'm new to c# an missing functions like memcmp and memcpy from C. Is there something similar ?
cu Alex
"Alex Stark" <st****@online.nospam> wrote in
news:e4**************@TK2MSFTNGP10.phx.gbl: Hi Stoicho,
thanks for your answer. But I don't really understand what you mean. All I have is a bytearray b1 and I want to kow is, if a second bytearray b2 is part somewhere in b1.
In C the code is a simple :
int section_init(uchar *tra, int tralen) { int i, j=0; uchar buf[256];
if (memcmp(tra+4, "LOCKED", 6)) return(0); .................. }
How is such a simple think in C# realizable ? Sure, I can build a string and in this case this will be the easiest way.....but I think, there are some more complex issues, where string conversation will not the best way.
Thanks for your help !!!!!!!!!!!
Alex
"Stoitcho Goutsev (100)" <10*@100.com> schrieb im Newsbeitrag news:O6**************@TK2MSFTNGP12.phx.gbl... Alex,
To copy value types (such as structures) what you need to do is just using the assignment operator; this will make a shallow copy of the struct members.
I would say almost all reference types that represent block of data in the memory (e.g. arrays and collections) CopyTo method. Actually this method is defined in the ICollection interface.
The other way you can create a copy of an object's data is to call Clone if the type implements ICloneable interface.
In addition there is a method defined on the level of the Object class called MemberwiseClone. This mehod creates a shallow copy of the object. The method is protected and is meant to be used for implementing *clone*.
As far as string comparison goes you can use the CompareXXXX methods of the String class.
-- HTH Stoitcho Goutsev (100)
"Alex Stark" <st****@online.nospam> wrote in message news:%2****************@TK2MSFTNGP10.phx.gbl... Hi,
I'm new to c# an missing functions like memcmp and memcpy from C. Is there something similar ?
cu Alex
Have a look at the Buffer class.
Alex,
In .NET array of bytes is different than array of chars which is totally
different than strings. Further mode Char is 16 bit where Byte is 8.
If you want to look for a sub string use strings. Otherwise you
need to write your own code for lookup consecutive bytes in a byte array.
There is no equivalent of memcmp in managed framework.
--
HTH
Stoitcho Goutsev (100)
"Alex Stark" <st****@online.nospam> wrote in message
news:e4**************@TK2MSFTNGP10.phx.gbl... Hi Stoicho,
thanks for your answer. But I don't really understand what you mean. All I have is a bytearray b1 and I want to kow is, if a second bytearray b2 is part somewhere in b1.
In C the code is a simple :
int section_init(uchar *tra, int tralen) { int i, j=0; uchar buf[256];
if (memcmp(tra+4, "LOCKED", 6)) return(0); .................. }
How is such a simple think in C# realizable ? Sure, I can build a string and in this case this will be the easiest way.....but I think, there are some more complex issues, where string conversation will not the best way.
Thanks for your help !!!!!!!!!!!
Alex
"Stoitcho Goutsev (100)" <10*@100.com> schrieb im Newsbeitrag news:O6**************@TK2MSFTNGP12.phx.gbl... Alex,
To copy value types (such as structures) what you need to do is just using the assignment operator; this will make a shallow copy of the struct members.
I would say almost all reference types that represent block of data in the memory (e.g. arrays and collections) CopyTo method. Actually this method is defined in the ICollection interface.
The other way you can create a copy of an object's data is to call Clone if the type implements ICloneable interface.
In addition there is a method defined on the level of the Object class called MemberwiseClone. This mehod creates a shallow copy of the object. The method is protected and is meant to be used for implementing *clone*.
As far as string comparison goes you can use the CompareXXXX methods of the String class.
-- HTH Stoitcho Goutsev (100)
"Alex Stark" <st****@online.nospam> wrote in message news:%2****************@TK2MSFTNGP10.phx.gbl... Hi,
I'm new to c# an missing functions like memcmp and memcpy from C. Is there something similar ?
cu Alex
Stoitcho Goutsev (100) <10*@100.com> wrote: In .NET array of bytes is different than array of chars which is totally different than strings. Further mode Char is 16 bit where Byte is 8. If you want to look for a sub string use strings. Otherwise you need to write your own code for lookup consecutive bytes in a byte array.
There is no equivalent of memcmp in managed framework.
Note that there's Buffer.BlockCopy, which isn't really an equivalent,
but can sometimes be used in the same situations.
--
Jon Skeet - <sk***@pobox.com> http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too
Hello Jon Skeet [C# MVP], Stoitcho Goutsev (100) <10*@100.com> wrote:
In .NET array of bytes is different than array of chars which is totally different than strings. Further mode Char is 16 bit where Byte is 8. If you want to look for a sub string use strings. Otherwise you need to write your own code for lookup consecutive bytes in a byte array. There is no equivalent of memcmp in managed framework. Note that there's Buffer.BlockCopy, which isn't really an equivalent, but can sometimes be used in the same situations.
Note that memcmp = memory compare, as he's searching for a byte sequence
in a larger array.
Don't think there's anything present in the .NET framework that does exactly
that, at least neither Buffer or Array seems to have any methods that compare
parts of arrays against each other.
--
Lasse Vågsæther Karlsen http://usinglvkblog.blogspot.com/
mailto:la***@vkarlsen.no
PGP KeyID: 0x2A42A1C2
Lasse Våqsæther Karlsen wrote: There is no equivalent of memcmp in managed framework. Note that there's Buffer.BlockCopy, which isn't really an equivalent, but can sometimes be used in the same situations.
Note that memcmp = memory compare, as he's searching for a byte sequence in a larger array.
Oops - you're absolutely right. I misread Stoitcho's post. Doh!
Jon This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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