Re: the header file of threads - C / C++ / MFC Discussion Boards

Re: need help to looking some Tutorials of thread develop in C++ with out MFC...

led mike26-May-06 9:11

led mike

26-May-06 9:11

try this[^]

Re: need help to looking some Tutorials of thread develop in C++ with out MFC...

Hamid_RT26-May-06 18:41

Hamid_RT

26-May-06 18:41

See Here[^] maybe it is some helpful to you

whitesky

How to save position of selected item in CTreeCtrl [modified]

AnTri26-May-06 6:15

AnTri

26-May-06 6:15

Hey,

I've an application using a CTreeCtrl for navigation. When the user closes the application I want to save the selected item. I cannot use the CTreeCtrl::ItemData because several items hold the same data. Is there any way, to get an ID or a possition of the selected item?

Thanx for your help!

-- modified at 12:15 Friday 26th May, 2006

Re: How to save position of selected item in CTreeCtrl [modified]

valikac26-May-06 6:33

valikac

26-May-06 6:33

not easy

depends tree depth

One approach index.

Kuphryn

Re: How to save position of selected item in CTreeCtrl

led mike26-May-06 9:05

led mike

26-May-06 9:05

Walk up the nodes to the root building a path object/string whatever you need.

the header file of threads

noumanzaidi26-May-06 3:25

noumanzaidi

26-May-06 3:25

how can i implinent thereads in MFC what is the header file that i can use if anyone know plz let me know at noumanzaidi@hotmail.com

nomy

Re: the header file of threads

Sarath C26-May-06 3:36

Sarath C

26-May-06 3:36

you can start a thread using MFC by calling AfxBeginThread function.

The function (pointer) poassing this function should be static if it is part of a class.
normally we will pass the object pointer to teh function to access the data of the class.

u can also pass global function as thread routine.

the function should prototyped as follows
UINT FxnName(LPVOID pParam )

i think it is better to use CreateThread function instead of calling AfxBeginThread.

See MSDN for more info.

Sa^Rath

Re: the header file of threads

David Crow26-May-06 3:52

David Crow

26-May-06 3:52

SaRath C wrote:
i think it is better to use CreateThread function instead of calling AfxBeginThread.

MFC is not properly initialized for the thread context when CreateThread() is used.

"The largest fire starts but with the smallest spark." - David Crow

Re: the header file of threads

Sarath C26-May-06 3:37

Sarath C

26-May-06 3:37

See example below

UINT MyThreadProc( LPVOID pParam )
{
CMyObject* pObject = (CMyObject*)pParam;

if (pObject == NULL ||
!pObject->IsKindOf(RUNTIME_CLASS(CMyObject)))
return 1; // if pObject is not valid

// do something with 'pObject'

return 0; // thread completed successfully
}

// inside a different function in the program
.
.
.
pNewObject = new CMyObject;
AfxBeginThread(MyThreadProc, pNewObject);

Sa^Rath

Re: the header file of threads

C^hris L^osinger26-May-06 3:38

C^hris L^osinger

26-May-06 3:38

http://www.codeproject.com/threads/#Threads[^]

Cleek | Image Toolkits | Thumbnail maker

Re: the header file of threads

Sarath C26-May-06 3:41

Sarath C

26-May-06 3:41

http://www.codeproject.com/threads/crtmultithreading.asp[^]

Sa^Rath

ado in vc++

GANsJob26-May-06 2:24

GANsJob

26-May-06 2:24

I use a table named FDetails with 4 text fields and a datetime field named date in MSaccess
when insert values into table ising ado recordset obj I receive some syntax error
recordset->Open("INSERT INTO FDetails(name,path,duration,volume,date) VALUES('hello','location','duration','vol','12/12/2000')",connection.GetInterfacePtr(), ADODB::adOpenForwardOnly,ADODB::adLockReadOnly, ADODB::adCmdText);

any one know inserting date into table

Re: ado in vc++

David Crow26-May-06 2:35

David Crow

26-May-06 2:35

GANsJob wrote:
when insert values into table ising ado recordset obj I receive some syntax error

And that error would be what?

"The largest fire starts but with the smallest spark." - David Crow

Re: ado in vc++

GANsJob26-May-06 2:45

GANsJob

26-May-06 2:45

the error is
syntax error in insert into statement

Re: ado in vc++

David Crow26-May-06 3:13

David Crow

26-May-06 3:13

See here.

"The largest fire starts but with the smallest spark." - David Crow

Re: ado in vc++

Milton Karimbekallil26-May-06 2:39

Milton Karimbekallil

26-May-06 2:39

Try change the field name 'date' to 'date1'. If I remember correctly, date is a reserved word in ms access.

cheers..milton kb.

Calling VB function in Win32 Dll

Arun Tayal26-May-06 1:30

Arun Tayal

26-May-06 1:30

Hello All,

I am using a Win32 regular Dll . I want to call a function written in VB application using function pointers.

The snippet from Win32 dll is as follows:

typedef int (*pt2Function)(char*);

pt2Function Objectpt2Function;

EXPORT int PASCAL PassPtr(int (*pt2Func)(char*))
{
pt2Func("arun");
return 1;
}

The Snippet from VB Application is as follows:

Public Sub Callbackfuntion(ByVal str1 As String)

MsgBox "Callbackfuntion"
End Sub

x = PassPtr(VarPtr(Callbackfuntion))

This all results in the application crash....
Can anyone suggest me a solution how I can call this function??

Thanks in Advance

Arun Tayal

Re: Calling VB function in Win32 Dll

Milton Karimbekallil26-May-06 2:13

Milton Karimbekallil

26-May-06 2:13

You cannt call a VB function from c++ without using COM, because all vb dlls are com components. SO the typical win32 dll function call approch using typedef wont work here. You cave to use

#import yourvbcomponent.dll <br />
<br />
CoInitilaize(NULL) //initialize com runtime<br />
yourvbcomponentLib::_vbclassPtr clsPtr(yourvbcomponentLib::vbclass)//cocreate an instance of ur vb class<br />
<br />
CString msg = "tst msg";<br />
BSTR bstr = msg.AllocSysString();<br />
clsPtr->Callbackfuntion(bstr);<br />
SysFreeString(bstr);<br />

cheers....milton.

OnReceive is not getting called, Why?

syntaxed26-May-06 1:23

syntaxed

26-May-06 1:23

Im trying somewhat simplest idea of sockets app using multicast.

Following is what SockApp1 does:
1) OnButtonCreate() creates the port, default OS assigned port. Create(0, SOCK_DGRAM)

m_pUDPSocket->Create(0, SOCK_DGRAM);

2) When OnButtonInitMulti() the mutlicast group(ip/port) is initialized.

// set up destination address <br />
memset(&m_addrMulti,0,sizeof(m_addrMulti));<br />
m_addrMulti.sin_family		=AF_INET;<br />
m_addrMulti.sin_addr.s_addr	=inet_addr(MULTIADDR);<br />
m_addrMulti.sin_port		=htons(MULTIPORT);

3) When OnButtonSend()it sends the data to the group.

SendTo(m_sendBuffer, m_sendBuffer.GetLength(), <br />
(const SOCKADDR* )&m_addrMulti, sizeof(m_addrMulti));

SockApp2 with following buttons clicked:
1) OnButtonCreate() creates the port, default OS assigned port. Create(0, SOCK_DGRAM)

m_pUDPSocket->Create(0, SOCK_DGRAM);

2) OnButtonJoinMulti() joins the multicast group.

ip_mreq mreq;<br />
memset(&mreq, 0, sizeof(ip_mreq));<br />
mreq.imr_multiaddr.s_addr = inet_addr(MULTIADDR);<br />
mreq.imr_interface.s_addr = htonl(MULTIPORT);<br />
<br />
if(SOCKET_ERROR == SetSockOpt(IP_ADD_MEMBERSHIP, &mreq, sizeof(mreq)))<br />
{<br />
	AfxMessageBox("Error: Unable to add membership");<br />
	return -1;<br />
}

here...

#define MULTIADDR	"224.0.1.129"<br />
#define MULTIPORT319	5009

Now, SockApp1, when i click onto the Send button, OnButtonSend() shud get called in which im doing the SendTo() thing. Uptill here the App1/App2 both are working fine, and the data is being sent successfully, this im sure.

The problem is, that SockApp2, which joined the group, is unable to receive the data being sent from SockApp1.

Now, SockApp1 and SockApp2 are actually a single app, called SockApp. I added SockApp1/2 names just for the clarity of the question and understanding.

At this moment, im just wondering... why SockApp2 is not receiving the data from SockApp1??? Sigh | :sigh:

Any ideas why? WTF | :WTF:

Best regards,
JT!

Re: OnReceive is not getting called, Why?

syntaxed27-May-06 5:36

syntaxed

27-May-06 5:36

any one???

Best regards,
JT!

Assertion error

Anu_Bala26-May-06 1:20

Anu_Bala

26-May-06 1:20

I got error as follows
_CrtISValidHeapPointer(pUserData)

as assertion error what is that?any one help me

Re: Assertion error

Hamid_RT26-May-06 1:24

Hamid_RT

26-May-06 1:24

Can you be more specific please

whitesky

Re: Assertion error

Anu_Bala26-May-06 1:29

Anu_Bala

26-May-06 1:29

Just file reading i am reading,the whole coding is going process fine,but after InitInstance the control goes to disassembly and shows this error and sometimes unhandled exception error is also coming.

Re: Assertion error

Hamid_RT26-May-06 1:35

Hamid_RT

26-May-06 1:35

can you show your code that has error,please

whitesky

Re: Assertion error [modified]

Stephen Hewitt26-May-06 1:55

Stephen Hewitt

26-May-06 1:55

It means you're trying to delete (or free or some other heap allocation function) memory you shoudn't. Possible reasons;
- Freeing already freed memory;
- Freeing memory not allocated on the heap;
- Freeing an address in the middle of a heap block (e.g. delete ((new int[2])+1);).

Steve

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.