C / C++ / MFC

Re: How to print string in next line on Edit control

13-Nov-08 17:36

Does the control have the ES_MULTILINE style?

"Love people and use things, not love things and use people." - Unknown

"The brick walls are there for a reason...to stop the people who don't want it badly enough." - Randy Pausch

voidjinjin13-Nov-08 14:46

voidjinjin

13-Nov-08 14:46

you should try to do this: m_strOutput+=_T("\r\n") Smile | :)

Browser plugins question.

rrrado13-Nov-08 2:38

rrrado

13-Nov-08 2:38

Maybe this is not the best forum to answer my question, but because plugins can be written in C++ I hope somebody who is making them will answer Smile | :)

Can somebody tell me if browser plugins for IE (activeX) or firefox can read (any) files on the HDD? (when they know exact path).
Somebody have told me that it is insecure to store sensitive data into "application data" folder because it can be accesses by web plugins.
Is it true? I'd guess they can access any files/folders with active user permissions.

Thank you

Re: Browser plugins question.

David Crow13-Nov-08 2:44

Re: Browser plugins question.

13-Nov-08 2:44

rrrado wrote:
Can somebody tell me if browser plugins for IE (activeX) or firefox can read (any) files on the HDD?

Since the code is C++, why wouldn't they be able to? See here for BHO examples.

"Love people and use things, not love things and use people." - Unknown

"The brick walls are there for a reason...to stop the people who don't want it badly enough." - Randy Pausch

rrrado13-Nov-08 3:02

rrrado

13-Nov-08 3:02

That's what I've thought ... but I have no idea about firefox

Re: Browser plugins question.

Saurabh.Garg13-Nov-08 14:01

Saurabh.Garg

13-Nov-08 14:01

Browser plugins can access files in the computer. Just take the case of online virus scanners, they are able to scan the entire HDD for viruses.

-Saurabh

which of the buttons is clicked ?

wielklem13-Nov-08 1:08

wielklem

13-Nov-08 1:08

Hi,

I'm creating a whole bunch of buttons during run-time. When anyone of these buttons is clicked it should go through the same function, but with different parameters. A small example to clarify;

for (x = 0; x < 10; x++)
{
  TButton *b = new TButton(this);
  b->Caption = "My button " + IntToStr(x);
  b->Top = 100;
  b->Left = 100 + 10 * x;
  b->OnClick = myfunction(x);
  b->Parent = this;
}

void __fastcall TForm1::myfunction(int x)
{
  ShowMessage("Button " + IntToStr(x) + " clicked");
}

This, however, doesn't work. I get an "Not an allowed type" error when compiling. Apparantly I can't pass variables like this to myfunction.

I can only do something like this;

b->OnClick = myfunction;

void __fastcall TForm1::myfunction(TObject *Sender)
{
  ShowMessage("Button ? clicked");
}

But how do I know which of the ten buttons is clicked now? How can I pass this information to the function?

thanx
Willem

CPallini13-Nov-08 2:04

13-Nov-08 2:04

See, for instance [^], I know it's Delphi, anyway it is conceptually the same issue.
Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

[My articles]

wielklem13-Nov-08 2:37

wielklem

13-Nov-08 2:37

verry nice, didn't think of that one Smile | :)

but the problem with this is, that it will only work with a known button, one that's written in the code.
when creating new buttons it wil return just the "button" methode as the sender.
so you know that a button is pushed and not an (ai) editbox or that it was a counter. but wich button you still don know.

CPallini13-Nov-08 2:59

13-Nov-08 2:59

Looks like David Crow has given already the solution [^].
Smile | :)

David Crow13-Nov-08 2:48

13-Nov-08 2:48

CPallini wrote:
I know it's Delphi...

Why would that be an issue?

"Love people and use things, not love things and use people." - Unknown

"The brick walls are there for a reason...to stop the people who don't want it badly enough." - Randy Pausch

CPallini13-Nov-08 2:56

13-Nov-08 2:56

Beacuse not all the guys around like Greece. Roll eyes | :rolleyes:

David Crow13-Nov-08 3:15

13-Nov-08 3:15

I suspect there's a joke in there somewhere, but, alas, it escapes me.

"Love people and use things, not love things and use people." - Unknown

"The brick walls are there for a reason...to stop the people who don't want it badly enough." - Randy Pausch

CPallini13-Nov-08 3:19

13-Nov-08 3:19

I know is a silly one [^].
Smile | :)

David Crow13-Nov-08 2:53

13-Nov-08 2:53

wielklem wrote:
But how do I know which of the ten buttons is clicked now?

In myfunction(), what does Sender represent? If it's the button, then look at its Caption property.

"Love people and use things, not love things and use people." - Unknown

"The brick walls are there for a reason...to stop the people who don't want it badly enough." - Randy Pausch

wielklem13-Nov-08 5:30

wielklem

13-Nov-08 5:30

yes it does.
and with thath it returns the caption Smile | :)

thnx!

Iain Clarke, Warrior Programmer

Iain Clarke, Warrior Programmer13-Nov-08 2:55

13-Nov-08 2:55

I've never use borlands object library - I used their compiler way back when in my 16bit days (ie, up to 1999), so take this next bit under advisement.

In raw windows (which I bet Builder sits on top of):
A button (or any other control) has an ID, which is set when the button is created (CreateWindow parameter), or later (with ::SetWindowLong(hWnd, GWL_ID, nID) )

When a button is pressed, it sends a WM_COMMAND message, and one of the parameters has the ID number embedded in it.

MFC has message handlers of the form:
ON_COMMAND_RANGE(ID_FIRST, ID_LAST, MemberFunction)
where function is of the form:
void CMyDlg::MemberFunction (UINT nID)

so your function can tell different controls apart.

I bet you'll find that TButton inherits from something like TWnd, which will have a SetDlgCtrlID member function, and it has some sort of message routing table.

Iain.

Update the Window..

gothic_coder12-Nov-08 23:57

12-Nov-08 23:57

Hi all..

I'm creating the window with the help of CreateWindowEx. And i'm making it transparent.. And i'm drawing PNG on that window.. Now i need to repaint it whenever any window is dragged to it. As soon as any of the window dragged on it my WM_PAINT should get called. How do i do that?

Thanks.

SandipG 13-Nov-08 1:12

SandipG

13-Nov-08 1:12

May be you can handle WM_WINDOWPOSCHANGED message?

Regards,
Sandip.

gothic_coder13-Nov-08 3:23

13-Nov-08 3:23

That will just call when my window changes.. I need to get notify when other window move on to my window.. Hope you're getting my problem.

Thanks.

Re: Update the Window.. [modified]

bob1697213-Nov-08 16:35

bob16972

13-Nov-08 16:35

In what method are you drawing your png?

gothic_coder13-Nov-08 19:04

13-Nov-08 19:04

I'm using CxImage to draw PNG.. doing something like that..

HDC hdc = BeginPaint (hWnd , &ps) ;
CxImage* image = new CxImage();
image->LoadResource(FindResource(NULL,MAKEINTRESOURCE(IDR_PNG2),"PNG"),CXIMAGE_FORMAT_PNG);
BOOL iReturn = image->Draw(hdc, 1, 1);
EndPaint (hWnd, &ps) ;

Though i'm able to paint on desktop screen also by taking Desktop DC and passing to Draw but again when any window is dragged on it the PNG get erased...

modified on Friday, November 14, 2008 1:16 AM

bob1697214-Nov-08 4:18

bob16972

14-Nov-08 4:18

In what method (or function) is that code snippet located?

gothic_coder14-Nov-08 20:32