Re: function with 3 return values - C / C++ / MFC Discussion Boards

Re: EnableWindow

Shog⁹29-Jul-02 17:59

Shog⁹

29-Jul-02 17:59

Loop through and disable all the controls, but leave the window enabled.

---

Shog⁹
If I could sleep forever, I could forget about everything...

Re: EnableWindow

Peter Occil29-Jul-02 18:13

Peter Occil

29-Jul-02 18:13

The windows in the task list, as it's more correctly called, meet the following criteria:

No parent
Visible
No owner and WS_EX_TOOLWINDOW, OR Owner and WS_EX_APPWINDOW
At least one character of text

Peter O.

Re: EnableWindow

Anonymous29-Jul-02 18:32

Anonymous

29-Jul-02 18:32

Thanks Shog and Peter !!

function with 3 return values

dhon29-Jul-02 17:07

dhon

29-Jul-02 17:07

is it possible for me to create a function with 3 return values?

Re: function with 3 return values

Nish Nishant29-Jul-02 17:14

Nish Nishant

29-Jul-02 17:14

dhon wrote:
is it possible for me to create a function with 3 return values?

Nope. But you can pass arguments by reference and thus you can use those arguments as OUT parameters

Nish

Author of the romantic comedy

Summer Love and Some more Cricket [New Win]

Review by Shog⁹
Click here for review[NW]

Re: function with 3 return values

Roman Nurik29-Jul-02 18:14

Roman Nurik

29-Jul-02 18:14

or you could have it return a struct:

struct MyFuncReturnType
{
   int one;
   std::string two;
   void* three;
};

- Roman -

Re: function with 3 return values

Jason Henderson29-Jul-02 18:39

Jason Henderson

29-Jul-02 18:39

Maybe you should read a c++ book.

Jason Henderson
_{quasi-homepage}
^articles
_{"Like it or not, I'm right!"}

Re: function with 3 return values

Brian Azzopardi30-Jul-02 0:47

Brian Azzopardi

30-Jul-02 0:47

1. Read a C/C++ book.
2. If you really wanna do it you can use assembly to push the values onto the stack and than pop them when the function returns.
3. I really do think u need a C/C++ book Smile | :)

bibamus, edamus, cras moriemur

[eat, drink, for tomorrow we die]

how to do ddk program?

sammon29-Jul-02 16:50

sammon

29-Jul-02 16:50

I have a sample of win2k ddk's netcfg.I want to write the same program.But when I use there include file there are many errors.
d:\program files\ntddk\inc\rpcndr.h(880) : error C2146: syntax error : missing ';' before identifier 'MaxCount'
d:\program files\ntddk\inc\rpcndr.h(880) : error C2501: 'ULONG_PTR' : missing storage-class or type specifiers
d:\program files\ntddk\inc\rpcndr.h(880) : error C2501: 'MaxCount' : missing storage-class or type specifiers
what's wrong with the program.I have set the include file path in Vc.
Please help me.
Friends who have written ddk program help me please.

I want to ask a question.^_^

Re: how to do ddk program?

sammon29-Jul-02 21:10

sammon

29-Jul-02 21:10

someone help me? Frown | :(

Re: how to do ddk program?

[James Pullicino]30-Jul-02 1:57

[James Pullicino]

30-Jul-02 1:57

You might need the latest platform sdk.

James

Drinking In The Sun
Forgot Password?

Re: how to do ddk program?

sammon30-Jul-02 21:32

sammon

30-Jul-02 21:32

i installed the platform sdk.But there is the same question.What's wrong with it?

I want to ask a question.^_^

The m Prefix?

Brian Olej29-Jul-02 16:04

Brian Olej

29-Jul-02 16:04

This may seem like and odd question, but why do most people prefix some of their variables with "m"? Does it help distinguish member variables or somthing of the sort? Confused | :confused:

Re: The m Prefix?

Nish Nishant29-Jul-02 16:08

Nish Nishant

29-Jul-02 16:08

Brian 1415 wrote:
Does it help distinguish member variables

Yes it does Smile | :)

Nish

Author of the romantic comedy

Summer Love and Some more Cricket [New Win]

Review by Shog⁹
Click here for review[NW]

Re: The m Prefix?

Michael Dunn29-Jul-02 17:36

Michael Dunn

29-Jul-02 17:36

Yes, the prefix helps the reader to recognize a member variable, one that isn't declared right there in the function. Other prefixes are g_ for globals (pretty common), and s_ for statics in a function (less common, although I use it). I've also seen one or two people use c_ for controls (such as a CListCtrl in a dialog) but I prefer using m_wnd for those.

--Mike--
Just released - RightClick-Encrypt v1.3 - Adds fast & easy file encryption to Explorer
My really out-of-date homepage
Sonork-100.19012 Acid_Helm

Re: The m Prefix?

ColinDavies29-Jul-02 18:10

ColinDavies

29-Jul-02 18:10

I like the c_ for control.
Always I use the first letter in lower case to show the type.
eg int m_iCount, CSize m_zBox, Point m_pDot. etc.
Especially in larger apps I find it makes Life easier with the intellisense stuff.

Regardz
Colin J Davies

Sonork ID 100.9197:Colin

You are the intrepid one, always willing to leap into the fray! A serious character flaw, I might add, but entertaining.
Said byRoger Wright about me.

Re: The m Prefix?

Nish Nishant29-Jul-02 18:15

Nish Nishant

29-Jul-02 18:15

Michael Dunn wrote:
I've also seen one or two people use c_ for controls

The c_ prefix for control member variables is the Joseph M Newcomer recommended way. Smile | :)

Nish

Author of the romantic comedy

Summer Love and Some more Cricket [New Win]

Review by Shog⁹
Click here for review[NW]

Re: The m Prefix?

Brian Olej29-Jul-02 19:53

Brian Olej

29-Jul-02 19:53

Thank you. Smile | :)

Re: The m Prefix?

[James Pullicino]30-Jul-02 1:58

[James Pullicino]

30-Jul-02 1:58

Yes, its called Hungarian Notation, which is decreasing in popularity lately.

Drinking In The Sun
Forgot Password?

Memory Leak!

wilche29-Jul-02 16:01

wilche

29-Jul-02 16:01

hello everybody!

I have some trouble in freeing up the memory allocated for dialog items.
I have created the Gui screens using new and I use DestroyScreen to free my memory like this:

<br />
virtual void DestroyScreen(void) <br />
{<br />
   if (m_pDlg->GetSafeHwnd())<br />
   {<br />
       delete m_pDlg;<br />
       m_pDlg = NULL;<br />
   }<br />
}<br />

}

I go through each dlg using this DestroyScreen function.

The returned warning is:

Warning: calling DestroyWindow in CDialog::~CDialog --
OnDestroy or PostNcDestroy in derived class will not be called.
Detected memory leaks!
Dumping objects ->
{3539} client block at 0x0081A330, subtype 0, 332 bytes long.
a CDialog object at $0081A330, 332 bytes long

Could anyone please help me with this one?

Thanks everyone!

Cheers,
wilche

Re: Memory Leak!

Nish Nishant29-Jul-02 16:12

Nish Nishant

29-Jul-02 16:12

The right way to do this is to delete it in the PostNcDestroy

void CYourDlg::PostNcDestroy() 
{	
    CDialog::PostNcDestroy();
    delete this;
}

Regards,
Nish

Author of the romantic comedy

Summer Love and Some more Cricket [New Win]

Review by Shog⁹
Click here for review[NW]

Re: Memory Leak!

Michael Dunn29-Jul-02 17:43

Michael Dunn

29-Jul-02 17:43

You're destroying the dialog C++ object before the dialog window has been destroyed. Call m_pDlg->DestroyWindow() (assuming these are modeless) and call delete this; in each dialog's PostNCDestroy().

--Mike--
Just released - RightClick-Encrypt v1.3 - Adds fast & easy file encryption to Explorer
My really out-of-date homepage
Sonork-100.19012 Acid_Helm

Re: Memory Leak!

includeh1030-Jul-02 7:02

includeh10

30-Jul-02 7:02

let me guess ur problem:
m_pDlg is a pointer to CDialog or its sub-class, say XDialog.

instances are not from XDialog, but its sub-class.

if my guess is correct, simply change distructor to 'virtual' one. that is all.

for MFC class, it is not necessary to call Destroy, MFC can do it itself.

includeh10

A Question about ChttpFile

lxdff29-Jul-02 15:58

lxdff

29-Jul-02 15:58

I'm learning VC++/MFC programming.

I want post data to a webserver by http protocol,but it is errors

Source followed:

CString strHeaders =_T("Content-Type: application/x-www-form-urlencoded");
// URL-encoded form variables -
// name = "John Doe", userid = "hithere", other = "P&Q"
CString strFormData = _T("t=abcd");

CInternetSession session;
CHttpConnection* pConnection =
session.GetHttpConnection(_T("http://127.0.0.1/test.asp"));

CHttpFile* pFile =
pConnection->OpenRequest(CHttpConnection::HTTP_VERB_POST,_T("http://127.0.0.1/test.asp"));

why the pFile is null?

6对9说：好好的，打什么倒立。0对8讲：胖就胖一点了，系什么腰带。7对2讲，别跪了，跪死了也不嫁给你。5对3讲：哼，再隆胸也是假的

Re: A Question about ChttpFile

Joel Lucsy30-Jul-02 7:14

Joel Lucsy

30-Jul-02 7:14

lxdff wrote:
session.GetHttpConnection(_T("http://127.0.0.1/test.asp"));

GetHttpConnection requires a server, not a file. Try
session.GetHttpConnection(_T("127.0.0.1"));

Joel Lucsy (jjlucsy@ameritech.net)

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