C / C++ / MFC Discussion Boards

stevenson10-Oct-02 17:24

10-Oct-02 17:24

Hi,
I got a handle to a window, and want got a pointer to the windows object for further manipulation, how to do then? Example is welcomed.
Thanks

Extreme programming. Do the No.1

Re: Handle vs Pointer

C^hris L^osinger10-Oct-02 17:49

C^hris L^osinger

10-Oct-02 17:49

you mean you want a CWnd from an HWND ? CWnd::Attach and CWnd::FromHandle might help.

-c

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Re: Handle vs Pointer

stevenson10-Oct-02 18:18

stevenson

10-Oct-02 18:18

and how to use them, show me an example, plz.

Extreme programming. Do the No.1

Re: Handle vs Pointer

stevenson10-Oct-02 18:24

stevenson

10-Oct-02 18:24

Look the code, it doesn't work

<br />
int CALLBACK MonitorCallback(HGLOBAL hBuf, int nLen, LPARAM lParam)<br />
{<br />
   LPBYTE lpBuf = (LPBYTE)::GlobalLock((HGLOBAL)hBuf);<br />
   if(!lpBuf)<br />
	return 1;<br />
<br />
   CString str=HexDump(lpBuf,nLen);<br />
   CEdit Edit;<br />
 <br />
   Edit.Attach((HWND)lParam);<br />
   CEdit *pEdit=(CEdit*)Edit.FromHandle((HWND)lParam);<br />
   pEdit->SetWindowText(str);<br />
   <br />
   return 0;<br />
 <br />
}

what's wrong???

Thanks in advance

Extreme programming. Do the No.1

Re: Handle vs Pointer

Nish Nishant10-Oct-02 20:00

Nish Nishant

10-Oct-02 20:00

You have attached the HWND to the CEdit, so why do you then use FromHandle?

Edit.Attach(...)
Edit.SetWindowText(...)
Edit.Detach(...)

I think this should do it.

Regards,
Nish

Author of the romantic comedy

Summer Love and Some more Cricket [New Win]

Review by Shog⁹
Click here for review[NW]

Re: Handle vs Pointer

Michael Dunn10-Oct-02 20:04

Michael Dunn

10-Oct-02 20:04

CWnd* pEdit = CWnd::FromHandle ( (HWND) lParam );
pEdit->SetWindowText ( str );

Although you don't need to muck about with CWnds for such a simple task. Using the APIs would be simpler:

SetWindowText ( (HWND) lParam, str );

--Mike--
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Re: Handle vs Pointer

stevenson10-Oct-02 20:43

stevenson

10-Oct-02 20:43

This time I use a CListCtrl to accept data, this ListCtrl has three Columns for "No.", "Value" and "Time". its works well in my dialog, but after use Callback function to transfer ListCtrl Hanlde, the 2 subItems can't accept data, why?

Extreme programming. Do the No.1

Changing the font of a CStatic

monrobot1310-Oct-02 17:22

monrobot13

10-Oct-02 17:22

Hello All,

Is there anymore than this that I need to do so that the font used to print on a CStatic control is changed?

CFont font;
font.CreatePointFont (80, _T("Times New Roman"));

CWnd* pPrices = GetDlgItem (STATIC_SHOW_ALL);
pPrices->SetFont (&font, TRUE);

STATIC_SHOW_ALL is the ID of my static control. When I write on the control now (using a member var that's attached to it) it changes the font from the default the dialog is using but not to the font I set it to. Any help is as always much appreciated.

- monrobot13

Re: Changing the font of a CStatic

Nish Nishant10-Oct-02 18:07

Nish Nishant

10-Oct-02 18:07

Your CFont object is a temporary stack object. Make it a class member.

Nish

Author of the romantic comedy

Summer Love and Some more Cricket [New Win]

Review by Shog⁹
Click here for review[NW]

Re: Changing the font of a CStatic

monrobot1310-Oct-02 19:40

monrobot13

10-Oct-02 19:40

Works like a dream now. Thanks much.

- monrobot13

how to delete the margins when print with mfc

Anonymous10-Oct-02 16:58

Anonymous

10-Oct-02 16:58

When i priting,I always get a left and top margin,like printing a pixel on the left top corner:pDC->Pixel(0,0,RGB(0,0,0))
the result on the paper always get an offset.
I can get the physical offset of the printer,but how to change the offset,I tried SetViewportOrg,nothing changed!
any help?

int x = pDC->GetDeviceCaps(PHYSICALOFFSETX);
int y = pDC->GetDeviceCaps( PHYSICALOFFSETY);
pDC->SetViewportOrg (-x,-y);

Re: how to delete the margins when print with mfc

Gary R. Wheeler11-Oct-02 16:39

Gary R. Wheeler

11-Oct-02 16:39

Most ink jet and laser printers can not print from edge to edge of the paper. They can usually print to within 0.25 inches of the edge. The limit may be less, depending upon which edge and the type of printer.

Gary R. Wheeler

Call dll from within an exe

DarrollWalsh10-Oct-02 16:53

DarrollWalsh

10-Oct-02 16:53

2 part question. How do you include a dll in an app that I can call from a seperate exe. Like the way you call the excel.exe file but it is used as a dll. Thanks for your help.

Darroll

Not one person lives in the present. Only the past. I can prove it.

Design pattern

stevenson10-Oct-02 15:06

stevenson

10-Oct-02 15:06

Hi,
where can i find the information on Design pattern ?

thanks

Extreme programming. Do the No.1

Re: Design pattern

Christian Graus10-Oct-02 15:23

Christian Graus

10-Oct-02 15:23

In any books you might find on www.amazon.com that have the words 'design pattern' in them. I don't know of any websites really. safari.oreilly.com has some, and a 14 day free trial.

Christian

Hey, at least Logo had, at it's inception, a mechanical turtle. VB has always lacked even that... - Shog9 04-09-2002

During last 10 years, with invention of VB and similar programming environments, every ill-educated moron became able to develop software. - Alex E. - 12-Sept-2002

Re: Design pattern

Anonymous10-Oct-02 17:09

Anonymous

10-Oct-02 17:09

Microsoft Press has a book on Design Pattern of Visual Basic programming call Microsoft Visual Basic Design Patterns. I remember they also have one for software developement, but I can't remember the name of it.

If you want a very high level overview of the software life cycle, many university uses R S Pressman, Software Engineering: A Practioner's Approach, 5th edition, McGraw-Hill, 2000 It's a pretty good book, but it won't tell you in technical details what is good code pratice and what is not. If you find a good book with good code examples in a large enough project, let me know!

http://LessExpense.tripod.com

Re: Design pattern

Garth J Lancaster10-Oct-02 21:10

Garth J Lancaster

10-Oct-02 21:10

Ward Cunningham's WIKI site at : http://www.wiki.org[^]

has design pattern info. Or you could invest in the book written by the 'Gang of Four', Eric Gamma et al, mentioned somewhere within the Wiki - do a wiki search and you should find more details

Cheers, Garth

OOD Question: Data / GUI boundary

JennyP10-Oct-02 12:37

JennyP

10-Oct-02 12:37

Hello,

I'm writing a program that displays a list of tasks on a CListView report. The report view will have varying text color/font & item background colors depending on the context of each specific task (list item).

Where should I put the functions to determine these GUI parameters? In the document class or the CListView derived class? Should the document have functions that return the color of each specific list item? Or should the ListView make the determination based on gathering information about the Document tasks/items?

I suppose I could throw out the idea of modularity and just treat the GUI and the document as mutually dependent, but I believe that this would be poor design.

Does anyone have any pertinent wisdom about how to lay this out?

thanks!

JennyP

Re: OOD Question: Data / GUI boundary

Ed Gadziemski10-Oct-02 14:34

Ed Gadziemski

10-Oct-02 14:34

I would place the functions in the listview class since they alter listview behavior. If you place them in the document, you'll have to redesign (or replicate code) if you find you need additional document types in the future. Even if you don't need additional documents, you're more likely to find listview code samples on CodeProject, and that may save you some coding time.

Enable3DControls?

Henry P.10-Oct-02 12:07

Henry P.

10-Oct-02 12:07

Are there circumstances when calling Enable3DControls is necessary? I run Win2000 and it makes no difference whether this function is called during InitInstance. The MS doc says 3D controls are automatic on newer versions of Windows. Does that include Win95 and Up? The reason I ask is because adding this line of code adds 10-20 KB to your app (everything counts...lol)

Henry P.

Re: Enable3DControls?

Michael Dunn10-Oct-02 13:42

Michael Dunn

10-Oct-02 13:42

That call is only required if you plan on running on NT 3.51 Wink | ;)

--Mike--
Just released - 1ClickPicGrabber - Grab & organize pictures from your favorite web pages, with 1 click!
My really out-of-date homepage
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Re: Enable3DControls?

Henry P.10-Oct-02 14:06

Henry P.

10-Oct-02 14:06

WinNT 3.51 still exists?? lol...I think I'll get rid of that line. Thanks.

Henry P.

Just a beginner here

G. White10-Oct-02 12:03

G. White

10-Oct-02 12:03

I am building an SDI app with the CFormView Base Class. With in this program I have an array (CObArray m_aParts). I have added a dialog to the project with a CListBox control for display a list of items that are found in the array. I have included the dialog header file in the Doc class and vice versa. For some reason I cannot get my dialog class to retrieve information from the Doc (so it can populate the list box).

I am new to programming and have experimente by trying...
// Get pointer to currnet doc.
CProject4Doc* pDoc = GetDocument();
if (pDoc)
This only returns an error. I've tried assembling a CObArray object in the dialog and found out that it's impossible.

Than k you for any guidance.

Garry

Re: Just a beginner here

Christian Graus10-Oct-02 13:04

Christian Graus

10-Oct-02 13:04

GetDocument only works from the View class. You need to do this:

CProject4Doc * pDoc = (CProject4Doc *) (CMainFrame*)AfxGetMainWnd())->GetActiveDocument();

Something like that. GetMainWnd needs to be cast to your mainframe class, then it has a method which returns the document, which also needs casting.

Christian

Hey, at least Logo had, at it's inception, a mechanical turtle. VB has always lacked even that... - Shog9 04-09-2002

During last 10 years, with invention of VB and similar programming environments, every ill-educated moron became able to develop software. - Alex E. - 12-Sept-2002

Re: Just a beginner here

Anonymous10-Oct-02 19:48

Anonymous

10-Oct-02 19:48

Thanks a lot Christian. I haven't been able to get it to work yet, but feel as though I am on the right track. I appreciate your assistance.

Garry

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