C / C++ / MFC

Re: data conversion in mfc

31-Oct-02 2:44

Instead of using char* I would recommend using CString if you are using MFC or WTL. If not then use std::string to store the name of the printer.

Third option would be to use a TCHAR printername[ 256 ]; to store the name of the printer. Then when you want to store it use _tcsncpy( ) to copy the name of the printer from dmDeviceName to this buffer.

But I would recommend using a string class - either CString or std::string.

Wenn ist das Nunstück git und Slotermeyer? Ja! Beierhund das oder die Flipperwaldt gersput!

Stephane Rodriguez.31-Oct-02 2:47

Stephane Rodriguez.

31-Oct-02 2:47

in <wingdi.h> :

#ifdef UNICODE
typedef WCHAR BCHAR;
#else
typedef BYTE BCHAR;
#endif

How low can you go ?
(MS rant)

multi-threading

mystro_AKA_kokie31-Oct-02 2:24

mystro_AKA_kokie

31-Oct-02 2:24

<br />
CMyView::OnChar(...)<br />
{<br />
  PostThreadMessage(id,msg,0,0);<br />
}<br />

when i type with less than 130ms time intervals between keystrokes a deadlock results in the app's main thread.Any help would be greatly appreciated.

Re: multi-threading

Andreas Saurwein31-Oct-02 14:53

Andreas Saurwein

31-Oct-02 14:53

Any more info about the processing thread?
What does it do with the messages and how does it do it?
What kind of "deadlock" are you having?

I keep submitting “VB” as a Priority-1 bug, but apparently no one here knows how to fix it. Nick Hodapp, Semicolon

Flush socket buffer

Chintan31-Oct-02 2:19

Chintan

31-Oct-02 2:19

Sir, I want to flush out the socket buffer. But I can't get the way to do that. Help me....

C.R.Naik

Re: Flush socket buffer

Anonymous31-Oct-02 3:15

Anonymous

31-Oct-02 3:15

you can't AFAIK.
Btw, the proper sequence for closing a TCP connection is:

Finish sending data.
Call shutdown() with the how parameter set to 1.
Loop on recv() until it returns 0.
Call closesocket().

http://tangentsoft.net/wskfaq/newbie.html#normalclose

M

How to move a CTreeCtrl item?

Daniel Strigl31-Oct-02 1:50

Daniel Strigl

31-Oct-02 1:50

How can I move a CTreeCtrl item to a other position?

Item 1
  SubItem 11
  SubItem 12
  SubItem 13
Item 2
  SubItem 21
  SubItem 22
  SubItem 23

So I want to move Item 2 with all subitems (up or down):

Item 2
  SubItem 21
  SubItem 22
  SubItem 23
Item 1
  SubItem 11
  SubItem 12
  SubItem 13

How can I make this? (I want to move the current selected item with all subitems up or down)

Daniel Wink | ;)

---------------------------
Never change a running system!

Re: How to move a CTreeCtrl item?

dabs31-Oct-02 2:07

different CView derived views on same document

31-Oct-02 2:07

There's no built in method that does this. The only way I'm aware of is to manually walk the tree, create new items with the same attributes as the old ones and finally delete the old ones. It would probably be a good idea to disable redrawing in the control while doing this ( m_wndTreeCtrl.SetRedraw( FALSE ); at the beginning and m_wndTreeCtrl.SetRedraw( TRUE ); when everything is finished.

Wenn ist das Nunstück git und Slotermeyer? Ja! Beierhund das oder die Flipperwaldt gersput!

MVH31-Oct-02 1:28

MVH

31-Oct-02 1:28

I have a MFC MDI program, where I want to have in their own
MDIchildframe windows both CScrollView based view and CListView
based view. (Data neatly in CListView window, graphics in CScrollView window)

How can I accomplish that? Confused | :confused:

TIA
-Marko

CMultiDocTemplate?

MVH31-Oct-02 1:37

MVH

31-Oct-02 1:37

Do I need to use CMultiDocTemplate in CApp::InitInstance? Is that what I should read about or do I risk learning something for nothing? Wink | ;)

Re: different CView derived views on same document

Roger Allen1-Nov-02 6:27

Roger Allen

1-Nov-02 6:27

Yes, you need to use an addtional CMultiDocTemplate object:

pDocTemplate = new CMultiDocTemplate(
    IDR_PGPCONTYPE,
    RUNTIME_CLASS(CSGAControlDoc),
    RUNTIME_CLASS(CChildFrame), // custom MDI child frame
    RUNTIME_CLASS(CYourScrollView));
AddDocTemplate(pDocTemplate);
pDocTemplate = new CMultiDocTemplate(
    IDR_PGPCONTYPE,
    RUNTIME_CLASS(CSGAControlDoc),
    RUNTIME_CLASS(CChildFrame), // custom MDI child frame
    RUNTIME_CLASS(CYourListView));
AddDocTemplate(pDocTemplate);

By default this will register 2 view types wit hteh same document. When you create the document you will be asked which type of view you want. To add the other view type, you will have to write a function thats adds the new view to the existing document. I did this a while back, but the code has since gone obselete in my app and has been deleted, so I don;t have any example code ready to hand.

Roger Allen
Sonork 100.10016

I have a terminal disease. Its called life!

Printer Status

jerry0davis31-Oct-02 1:22

jerry0davis

31-Oct-02 1:22

I can easily see all the printers connnected / installed by using EnumPrinters, but when I view them from Control Panel - Printers, they all say Status - "Ready", and I know for a fact that one of them is turned off!! Anyone know how I can tell there true status of a printer please?

Thanks

I feel like I'm diagonally parked in a parallel universe

Jeremy Davis
http://www.astad.org
http://www.jvf.co.uk

Bitmaps and static controls question

Sens200231-Oct-02 1:18

Sens2002

31-Oct-02 1:18

Hi,

I am using static controls to display bitmaps in my dialog-based app. I am not using MFC. The bitmaps in the main dialog window display correctly, but the bitmaps in child dialogs (such as my 'About' dialog) do not appear at all.

I am doing exactly the same thing for the child dialogs as for the main dialog (using static control, selecting bitmap and the bitmap resource ID)
so what's going on?

Thanks, any suggestions welcome Smile | :)

Re: Bitmaps and static controls question

Ed Gadziemski31-Oct-02 3:36

Ed Gadziemski

31-Oct-02 3:36

Is the About dialog's static set to type BITMAP?

Yes type is set to bitmap...

Sens200231-Oct-02 4:18

Sens2002

31-Oct-02 4:18

The settings are:

ID: IDC_STATIC
Type: Bitmap
Image: IDB_BITMAP2

There is a valid bitmap resource called IDB_BITMAP2. The thing I can't understand is why it works in the main dialog, but no bitmaps appear in the About dialog?? Cry | :((

Drawing Doubt

RuiSantiago31-Oct-02 1:08

31-Oct-02 1:08

Hi,

I'm working on an application with many forms, i designed a layout for all the forms, but i wanted to build a class that had OnDraw(CDC* pDC) so i didn't have to override it from all my CFormView derived classes.

I created a CLayout Class with OnDraw(CDC* pDC) function and now i would like to call it from other classes so i could draw and paint the forms.

But, how can i get the pDC of this form?
And i also need the hWnd pointer in my CLayout::OnDraw Function

In my derived call i wrote:

HWND* hWnd=NULL;
hWnd=(HWND*)this->operator HWND();

CDC pDC=::GetDC(*hWnd);

CLayout ly(hWnd);
ly.OnDraw(&pDC);

...but GetDC function returns a HDC no CDC...

This is my OnDraw Function...

void CLayout::OnDraw(CDC* pDC)
{
//cria os objectos

CBrush brush(RGB_FUNDO);
CBrush* pTempBrush = NULL;
CBrush OrigBrush;
CString sFormName="New Machines";
CFont hFont;
CRect rc;

try
{
//cria a fonte para as letras de identificação do form

VERIFY(hFont.CreateFont(40, 15, 0, 0, FW_NORMAL,FALSE, FALSE, 0, ANSI_CHARSET, OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS, DEFAULT_QUALITY, DEFAULT_PITCH | FF_SWISS, "Arial Bold"));

//define a area total do ecran

GetClientRect(*hWnd,&rc);
ScreenToClient(*hWnd,&rc);

//seleciona o brush (cor) a usar

pTempBrush = (CBrush*)pDC->SelectObject(brush);

//guarda o brush original

OrigBrush.FromHandle((HBRUSH)pTempBrush);

//desenha o rectangulo a pintar com aquele brush

pDC->Rectangle(0, 0, rc.Width() , rc.Height());

//defino a cor do texto

pDC->SetTextColor(RGB_WHITE);

//elimino o bkgrn do texto

pDC->SetBkMode(TRANSPARENT);

//associa-lhe a fonte criada

pDC->SelectObject(hFont);
pDC->DrawText(sFormName, -1, CRect(15, 0, rc.Width(),80), DT_LEFT|DT_SINGLELINE|DT_VCENTER);

}
catch(CResourceException* e)
{
e->ReportError();
e->Delete();
}

pDC->SelectObject(&OrigBrush);
}

What am i doing wrong

Thank you for your time

rui

dabs31-Oct-02 2:18

31-Oct-02 2:18

You could try

<br />
CClientDC dc( this );<br />
CLayout ly( *this );<br />
ly.OnDraw( &dc );<br />

but if this code gets called in OnPaint then you should use CPaintDC instead.

You also might get away with supplying the hWnd of the form because CDC has a member function GetWindow( ) which returns the window associated with the device context (if there is a window BTW - returns NULL during printing for instance).

Wenn ist das Nunstück git und Slotermeyer? Ja! Beierhund das oder die Flipperwaldt gersput!

RuiSantiago31-Oct-02 4:43

31-Oct-02 4:43

Thank you dabs,

I changed my code, now in my CFormView derived class OnInitialUpdate() i did like:

ClientDC dc( this );
CWnd* cWnd=dc.GetWindow();
CLayout ly(cWnd );
ly.OnDraw( &dc );

then, i CLayout

CRect rc;
cWnd->GetClientRect(&rc);
GetClientRect((HWND)cWnd, &rc);
cWnd->ScreenToClient(&rc);

but rc is like : tagRECT: {top=32730 bottom=32730 left=32768 right=32768}

well, i forced other values, and it didn't draw the same, but in debug mode, i follow the pointer and it seems ok.

What can i be doing wrong?

Thanks once more for your time

dabs31-Oct-02 5:21

31-Oct-02 5:21

Looks like you are using a CWnd* as a HWND. I recommend using Hungarian notation to be able to spot such problems - your variable would be called pWnd in that case. Secondly, you don't need that ScreenToClient call since GetClientRect uses client coordinates already.

So change this code:

<br />
CRect rc; <br />
cWnd->GetClientRect(&rc);<br />
GetClientRect((HWND)cWnd, &rc);<br />
cWnd->ScreenToClient(&rc);<br />

to this:

<br />
CRect rc; <br />
cWnd->GetClientRect(&rc);<br />

Wenn ist das Nunstück git und Slotermeyer? Ja! Beierhund das oder die Flipperwaldt gersput!

RuiSantiago31-Oct-02 5:38

31-Oct-02 5:38

Thank you dabs for the recommendation,

I changed my code, it runs, in debug mode it passes without any problem by all code lines.
Maybe the way i'm passing the pWnd pointer is incorrect, i'm doing like:

CLayout::CLayout(CWnd* pWnd1)
{
pWnd=pWnd1;
}

pWnd is a member variable of CLayout

My class is :

class CLayout
{
public:
CLayout(CWnd* pWnd1=NULL);
~CLayout(void);

CWnd* pWnd;

public:
virtual void OnDraw(CDC* pDC);
};

Should it be derived from CFormView also?

I don't understand, it just don't draw, well, now rc is 0 for the four items...so it couldn't draw

I'm suspicious about the pWnd that i pass from one class to another.
What do you think?

Thank you for your patience Smile | :)

dabs31-Oct-02 5:47

31-Oct-02 5:47

The CWnd declaration and initialization is correct. And no, this class should not derive from CFormView unless you want to create another form Smile | :)

What happens in your Form's OnDraw and/or OnPaint functions?

Wenn ist das Nunstück git und Slotermeyer? Ja! Beierhund das oder die Flipperwaldt gersput!

RuiSantiago31-Oct-02 5:59

31-Oct-02 5:59

Well, i'm just Using OnDraw()

The function is :

void CLayout::OnDraw(CDC* pDC)
{
//cria os objectos

CBrush brush(RGB_FUNDO);
CBrush* pTempBrush = NULL;
CBrush OrigBrush;
CString sFormName="New Machines";
CFont hFont;
CRect rc;

try
{
//cria a fonte para as letras de identificação do form

VERIFY(hFont.CreateFont(40, 15, 0, 0, FW_NORMAL,FALSE, FALSE, 0, ANSI_CHARSET, OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS, DEFAULT_QUALITY, DEFAULT_PITCH | FF_SWISS, "Arial Bold"));

//define a area total do ecran

pWnd->GetClientRect(&rc);

//seleciona o brush (cor) a usar

pTempBrush = (CBrush*)pDC->SelectObject(brush);

//guarda o brush original

OrigBrush.FromHandle((HBRUSH)pTempBrush);

//desenha o rectangulo a pintar com aquele brush

pDC->Rectangle(0, 0, rc.Width() , rc.Height());

//defino a cor do texto

pDC->SetTextColor(RGB_WHITE);

//elimino o bkgrn do texto

pDC->SetBkMode(TRANSPARENT);

//associa-lhe a fonte criada

pDC->SelectObject(hFont);
pDC->DrawText(sFormName, -1, CRect(15, 0, rc.Width(),80), DT_LEFT|DT_SINGLELINE|DT_VCENTER);

}
catch(CResourceException* e)
{
e->ReportError();
e->Delete();
}
pDC->SelectObject(&OrigBrush);
}

I used this function in a OnDraw override from CFormView in my other class and i never thought it would be so dificult to make a class just for the propose... Dead | X|

I would appreciate very much if you could still hepl me with this, thanks a lot Big Grin | :-D

dabs31-Oct-02 6:33

31-Oct-02 6:33

Aside from the fact that you are casting a CBrush* to HBRUSH (which won't work) and that you forget to deselect your font out of the device context then there's nothing inherently wrong with this code. But why don't you simply use the resource editor in Visual C++ to arrange the form in a way you want? There are controls available that allow you to change the color of static text easily and if you want another background color in your form you can handle WM_ERASEBKGRND to change it. You actually don't need to do anything at all in OnDraw if you don't want to. Or are there other requirements that I'm not aware of?

Wenn ist das Nunstück git und Slotermeyer? Ja! Beierhund das oder die Flipperwaldt gersput!

RuiSantiago31-Oct-02 7:00

31-Oct-02 7:00

I'm working with vc.nte, i don't know if it makes a diference...

That cast is part of a piece of code i got and it worked, i hope that is not the reason this doesn't work.

And, honestly, i don't know how to deselect my font out of the device context.

The main reason i'm trying to do this is because the forms layout isn't completly defined, so if later i had to make changes in all, it would be easier, and if i could spare from creating more objects in my forms it would be better, but maybe that is what i'm going to do...

Thank you a lot for your time and dedication Wink | ;)

rui

dabs31-Oct-02 12:38