Re: TCP Socket Selection - C / C++ / MFC Discussion Boards

Re: Read content from CTreeCtrl!

Hamid_RT22-Jun-06 20:10

Hamid_RT

22-Jun-06 20:10

use GetRootItem for get root and then use GetNextItem(TVGN_CHILD) maybe it is some helpful to you

whitesky

adding data at the end of already exisiting file

zahid_ash22-Jun-06 1:32

zahid_ash

22-Jun-06 1:32

HI,

A file "ABC.txt" has already been created using CFile and modes
CFile::modeCreate | CFile::modeWrite | CFile::typeBinary

Now I am opeing it using modes
CFile::modeNoTruncate | CFile::modeWrite | CFile::typeBinary
and write the data in it

but it do not appeand the data at its end.
I am also using CFile::SeekToEnd();

Whats the write ways to add data at the end of already existing file?

thanks

Regards.

Re: adding data at the end of already exisiting file

_AnsHUMAN_ 22-Jun-06 1:40

_AnsHUMAN_

22-Jun-06 1:40

I had a file with some text in it. And this code successfully appends text to it.

CStdioFile file;
file.Open ("C:\\abc.txt",CFile::modeCreate | CFile::modeNoTruncate | CFile::modeWrite );
file.SeekToEnd ();
file.WriteString ("Anshuman");
file.Close ();

Somethings seem HARD to do, until we know how to do them.
Wink | ;-)

_AnShUmAn_

Re: adding data at the end of already exisiting file

zahid_ash22-Jun-06 2:01

zahid_ash

22-Jun-06 2:01

Was there any problem with my way stated in above query?

Regards.

Re: adding data at the end of already exisiting file

_AnsHUMAN_ 22-Jun-06 2:14

_AnsHUMAN_

22-Jun-06 2:14

You can achieve the same with your method.(using CFile) Post some code about how you are going with that and then we can comment on the change or modification you need to make. My Guess is that you may not be closing the file after creating it.

Somethings seem HARD to do, until we know how to do them.
Wink | ;-)

_AnShUmAn_

Re: adding data at the end of already exisiting file

Hamid_RT22-Jun-06 20:25

Hamid_RT

22-Jun-06 20:25

and this code is work or not work

<br />
CFile file(_T("c:\\test.txt"),CFile::modeNoTruncate | CFile::modeWrite );<br />
file.SeekToEnd();<br />
file.Write(_T("test"),4);<br />
file.Close ();<br />

whitesky

TCP Socket Selection

69 Bay22-Jun-06 1:31

69 Bay

22-Jun-06 1:31

How do you choose the socket number that you wish to use for a TCP connection?
Is there a band of numbers that you can use, if so what are they?

Thanks for any advice!

Mike

Re: TCP Socket Selection

bolivar12322-Jun-06 2:15

bolivar123

22-Jun-06 2:15

Mike,

There is no hard fast rule to selecting a port number for your own TCP services. In general the first 1024 are reserved for "well known" services and 49152 to 65535 are reserved for dynamically allocated and/or private port numbers.

Keep in mind where your service will be used, if it is a public service that anyone can connect to via the Internet, then you might want to be fairly selective on what port number you use. However if your service/server is to be used on a private network, then you can just about pick any port you want.

You can find a list of "well known" port numbers at:
http://www.iana.org/assignments/port-numbers[^]

Hope this helps.

Re: TCP Socket Selection

69 Bay22-Jun-06 2:31

69 Bay

22-Jun-06 2:31

Thanks for this.

My application(s) will be used on a private network, so there shouldnt be any issues with connection over the internet. Looking down the list, the first free block is 3825 - 3835, so I will probably look to us these.

Thanks for you help!

Mike

function needs pointer not vector

PhilRosenberg22-Jun-06 1:08

PhilRosenberg

22-Jun-06 1:08

Hi I'm writing some code that uses a set of purchased numerical algorithms. Unfortunately they use c function calls so any array that are passed to the functions are done so with pointers.
I usually use vectors rather than arrays so does anyone know how I can pass the vectors to these functions? Is it as simple as passing vector.front() or is there some other way to convert a c++ vector to a c array/pointer?

cheers

Re: function needs pointer not vector

Justin Tay22-Jun-06 1:19

Justin Tay

22-Jun-06 1:19

I usually use &myvector[0] for the array and myvector.size() for the array length.

Re: function needs pointer not vector

Ryan Binns22-Jun-06 1:22

Ryan Binns

22-Jun-06 1:22

vector.front() will work just fine. Just remember that it returns a reference, so take the address of its return value...

Ryan

"Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"

Re: function needs pointer not vector

Stephen Hewitt22-Jun-06 1:41

Stephen Hewitt

22-Jun-06 1:41

This technique is fine for vector s but it's not safe for any of the other standard containers.

Steve

Re: function needs pointer not vector

Ryan Binns22-Jun-06 2:03

Ryan Binns

22-Jun-06 2:03

Correct, but he did say he was using vectors...

Ryan

"Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"

Re: function needs pointer not vector

Viorel.22-Jun-06 1:23

Viorel.

22-Jun-06 1:23

In order to obtain a pointer to vector's values, you can try this: myVector.at(0).

Re: function needs pointer not vector

FarPointer22-Jun-06 1:24

FarPointer

22-Jun-06 1:24

I have done the way u have suggested and didnt face any problem , since vector is also an array ,a self growing array and is continous we shouldn't face any problem .

Regards,
FarPointer
Blog:FARPOINTER

Re: function needs pointer not vector

C^hris L^osinger22-Jun-06 1:26

C^hris L^osinger

22-Jun-06 1:26

FarPointer wrote:
we shouldn't face any problem

just don't assume the front of the vector will stay in the the same place if you add (or remove) elements to the vector. in other words, changing the vector may invalidate your 'pointer'.

Cleek | Image Toolkits | Thumbnail maker

Re: function needs pointer not vector [modified]

PhilRosenberg22-Jun-06 1:34

PhilRosenberg

22-Jun-06 1:34

Cheers everyone
I had thought that essentially vectors could be treated like pointers in this way, but I thought I'd check to see if others hade done it before.

Cheers for the tip on moving Chris, as it happens I'm just passing the vector, geting an answer and then that's it so it should be fine.

Thanks again

-- modified at 7:34 Thursday 22nd June, 2006 - typo

Re: function needs pointer not vector

Stephen Hewitt22-Jun-06 1:50

Stephen Hewitt

22-Jun-06 1:50

This technique is used by many. It's fine for vector. The capacity and reserve functions are even provided so the programmer can have some control over when reallocation occurs. Note however that it's can't be done with any of the other standard containers or the vector<bool> specialization.

Steve

Re: function needs pointer not vector

FarPointer22-Jun-06 3:12

FarPointer

22-Jun-06 3:12

I got a doubt how does a vector grow ,does it allocate using new or other mechanism .

Regards,
FarPointer
Blog:FARPOINTER

Re: function needs pointer not vector

Zac Howland22-Jun-06 3:26

Zac Howland

22-Jun-06 3:26

Stephen Hewitt wrote:
the vector<bool> specialization

I really wish implementers would just remove that specialization from their implementations.

If you decide to become a software engineer, you are signing up to have a 1/2" piece of silicon tell you exactly how stupid you really are for 8 hours a day, 5 days a week

Zac

Re: function needs pointer not vector

FarPointer22-Jun-06 2:23

FarPointer

22-Jun-06 2:23

yes iam aware of that and especially in this case you are passing it to a library thats taking a pointer so a push_back wont hapen( its with vector) ,so he can use it here without any trouble .

Regards,
FarPointer
Blog:FARPOINTER

How to access a VB.NET dll from C++

Manfred Staiger22-Jun-06 1:08

Manfred Staiger

22-Jun-06 1:08

Hello everybody,

I need to access some functions in a VB.NET dll from my VC++ application. The problem is that the dll doesn't export any functions like a common dll does. On a microsoft website I found a hint that looks like the .NET dll needs to implement a COM interface to fit my purposes, but I'm not shure.
Does anybody have more knowledge on this issue???

MS

Re: How to access a VB.NET dll from C++

led mike22-Jun-06 5:46

led mike

22-Jun-06 5:46

Manfred Staiger wrote:
the .NET dll needs to implement a COM interface to fit my purposes

Not entirly true. VC++ .NET compilers support "mixed mode". Use can use the /clr compiler switch to give your C++ project access to the .NET platform including components authored in nasty VB.NET Smile | :)

Now it's not quite that simple but that is basically the idea. There are plenty of MSDN resources about project settings etc.

Manfred Staiger wrote:
The problem is that the dll doesn't export any functions like a common dll does.

Correct, everything in .NET is a class. Using "mixed mode" you can create an instance and call the methods, or call the "static" methods of the class of course without an instance.

The Code Project (Managed) C++/CLI forum is dedicated to using the VC++ product with the .NET platform so your future questions on this subject should go there.

hope that helps

Toolbar: mutually exclusive buttons

Giulio200022-Jun-06 1:03

Giulio2000

22-Jun-06 1:03

Hello all,

I am sure this is simple to do but I can't find it anywhere.

How do you do mutally exclusive toolbar buttons?
I mean you know the kind of toolbar buttons that when pressed stay pressed and at the same time, deselects all other toolbar buttons in the same grop?

You know in Microsoft Word, you can align you test to the left, center, right or justified. When you press one of those buttons the button stay pressed and also only one of those buttons can be pressed at any given time.

How do you achieve that?

Thanks.

Ciao

Giulio

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