socket call function - C / C++ / MFC Discussion Boards

Anders Molin25-Mar-03 13:18

25-Mar-03 13:18

CCriticalSection is a MFC-wrapper around the Critical Section from Win32.

You should call cs.Lock() and cs.Unlock() instead of using Enter and LeaveCriticalSection.
To use Enter and Leave... use a CriticalSection instead, and drop your _RTL_CRITICAL_SECTION* cast.

- Anders

Money talks, but all mine ever says is "Goodbye!"

Database problem...

Dennis L25-Mar-03 4:30

Dennis L

25-Mar-03 4:30

Hi!

How can i use Delete() from CDaoRecordset class to delete records in an Access DB???

Re: Database problem...

Donovan28-Mar-03 9:23

Donovan

28-Mar-03 9:23

I think it works something like this.

CDaoRecordset rs(&m_DB);
CString cstrSql = "##########";

try{
rs.Open(dbOpenDynaset, szSql);
}
catch{CDaoException* e)
{
AfxMessageBox(e->m_pErrorInfo->m_strDescription);
return;
}

if(!rs.IsEOF())
{
rs.Delete();
}

rs.Close();

Donovan

flush the socket?

lucy25-Mar-03 4:10

lucy

25-Mar-03 4:10

Hi, I have a TCP/IP socket, which is created and set up already. I also established the connection between the client and the server.

Now my question is: is there any function to flush the socket? I want to do this because sometimes there is some timing issue between the server and the client, and the client will miss some data. If I do a shutdown(), closesocket(), then connect() on the client side, everything will be back to okay. Is there any easier way to replace the three function calls?

Thanks for any hint!

Re: flush the socket?

valikac25-Mar-03 7:26

valikac

25-Mar-03 7:26

What I/O model does the program utilize? For example, one solution is memset() to clear the data buffer linked you pass to WSARecv().

Kuphryn

Re: flush the socket?

lucy25-Mar-03 8:30

lucy

25-Mar-03 8:30

I am using TCP/IP socket, and send() recv().

Is WSARecv() more better than recv()?

Re: flush the socket?

valikac25-Mar-03 11:20

valikac

25-Mar-03 11:20

Correct.

WSARecv() is IPv6 and is used under non-blocking I/O models.

Kuphryn

socket call function

TeraCoder25-Mar-03 3:54

TeraCoder

25-Mar-03 3:54

Here's some of my code:

...
BtCard = socket(AF_BTH, SOCK_STREAM, BTHPROTO_RFCOMM);
if(WSAGetLastError() == 10047)
{
cout << "Address family not supported by protocol family!" << endl;
goto GetOut;
}
...

The socket function call above gives me the error message listed.

Checked the help documentation. Here's what "they" says on the use of the function:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/bluetooth/bluetooth/bluetooth_and_socket.asp[^]

Me, wrong!?! Nah, you just need to change your thinking to make me right.

Re: socket call function

Anders Molin25-Mar-03 14:32

Anders Molin

25-Mar-03 14:32

That's kinda strange.

Do you need a bluetooth update maybe?

- Anders

Money talks, but all mine ever says is "Goodbye!"

How to place a background picture under the grid

happycampus25-Mar-03 3:36

happycampus

25-Mar-03 3:36

hi,my friends.
Ijust meet one problem,I hope here must be someone that can help me!
In one of my programs, I use the MFC Grid control 2.24 which is one popular Grid on Codeproject.com.Now I want to place a background Image under the grid.But the CGridCtrl don't have such a function.
and how can I do?

I hope to get your help!

Smile | :)

thanks anyway!

how to delete corrupted file

A_CAN25-Mar-03 3:16

A_CAN

25-Mar-03 3:16

Hello all:
How can I delete the corrupted file ? DeleteFile fails for this file with unknown error code.
Thanks in advance

Re: how to delete corrupted file

Ravi Bhavnani25-Mar-03 4:28

Ravi Bhavnani

25-Mar-03 4:28

What does GetLastError() return?

/ravi

Let's put "civil" back in "civilization"
http://www.ravib.com
ravib@ravib.com

Re: how to delete corrupted file

Anonymous25-Mar-03 4:58

Anonymous

25-Mar-03 4:58

just 0, I am on Windows 98.
Thanks.

Re: how to delete corrupted file

Ravi Bhavnani25-Mar-03 5:22

Ravi Bhavnani

25-Mar-03 5:22

Are you sure you're calling GetLastError() immediately after calling DeleteFile()?

/ravi

Let's put "civil" back in "civilization"
http://www.ravib.com
ravib@ravib.com

static and non-static function

wow999925-Mar-03 3:05

wow9999

25-Mar-03 3:05

Hi all

Can a static function call a non-static function inside the same class?

or

Can a static function call a non-static function in different class?

Thanks

Re: static and non-static function

Alin Negru25-Mar-03 3:13

Alin Negru

25-Mar-03 3:13

wow9999 wrote:
Can a static function call a non-static function inside the same class?

no

or

Can a static function call a non-static function in different class?

no

Re: static and non-static function

Tim Smith25-Mar-03 3:15

Tim Smith

25-Mar-03 3:15

Yes, no problem. As long as you have the object you wish to invoke the function.

Tim Smith

I'm going to patent thought. I have yet to see any prior art.

Re: static and non-static function

wow999925-Mar-03 3:20

wow9999

25-Mar-03 3:20

Dear Tim Smith

can you show me a example or hint to see a static or non-static funciton to call a static or non-static function.

Thanks

Re: static and non-static function

C^hris L^osinger25-Mar-03 3:50

C^hris L^osinger

25-Mar-03 3:50

class Foo
{
public:
  void Blah();
  
  static void Blech()
  {
     Foo f;
     f.Blah();
  }
};

-c

Image tools: ThumbNailer, Bobber, TIFFAssembler

Re: static and non-static function

Ravi Bhavnani25-Mar-03 4:26

Ravi Bhavnani

25-Mar-03 4:26

A static method doesn't have a this reference. Hence, it can only call other static methods of its class. However, if the static method has access to an instance of a class, it can call that instance's static or non-static method.

class Foo {
  ...
  public:
    static void staticFuncA();
    static void staticFuncB();
    void nonStaticFunc();
}
 
void Foo::staticFuncA()
{
  staticFuncB();      // OK
  nonStaticFunc();    // invalid, since no "this" reference
 
  Foo f;
  f.nonStaticFunc();  // OK
}

/ravi

Let's put "civil" back in "civilization"
http://www.ravib.com
ravib@ravib.com

Re: static and non-static function

Brigsoft25-Mar-03 7:58

Brigsoft

25-Mar-03 7:58

1)Yes, if I pass to the function object of its class.
2) By a same way.

================================
Useful links

Duplicate Menu..

Brian Shifrin25-Mar-03 2:51

Brian Shifrin

25-Mar-03 2:51

Anyone has handy library fuction to copy CMenu or HMENU???

Thanks,
Brian

P.S.
I know how, just to lazy to iterate menues & submenus & states...

Re: Duplicate Menu..

lucy25-Mar-03 4:12

lucy

25-Mar-03 4:12

do you mean the resource?

If so, open the *.rc file which contains the menu resource you want in visual studio while the destination project is opened. click on the resource ID, drag it to your destination project. That's it.

Re: Duplicate Menu..

Brian Shifrin25-Mar-03 4:34

Brian Shifrin

25-Mar-03 4:34

>do you mean the resource?

Nope

Dynamic CMenu/HMENU....

Re: Duplicate Menu..

John R. Shaw28-Mar-03 18:29

John R. Shaw

28-Mar-03 18:29

No, but could you be more specific.

Trust in the code Luke. Yea right!

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