C / C++ / MFC Discussion Boards

CodeHead7-Jun-04 2:13

7-Jun-04 2:13

My software prints out a calibrated tape. I would like to print it in mirror image so that when printed on film, it is the correct image when viewing it through the mylar. How do I print text in mirror image? Or is there an easy way to flip the CDC so that the rendered image will be reversed automatically?
TIA
Eric

Re: Printing mirror image

Roger Allen7-Jun-04 2:56

Roger Allen

7-Jun-04 2:56

Sounds like you need to use the SetWorldTransform() function. Take a look at it in the MSDN!

Roger Allen - Sonork 100.10016
Strong Sad: I am sad I am flying
_{Who is your favorite Strong?}

SetWorldTransform() not work for printing?

CodeHead7-Jun-04 9:57

CodeHead

7-Jun-04 9:57

Thanks Roger,
This is what I was looking for! However, there appears to be some kind of bug in that, although the image is properly mirrored on the display, (text and lines), when I perform a print preview, the graphics are flipped properly, but the text is no longer mirrored. Text is only rotated 180 degrees instead of mirrored. I created a SDI test app and have the code listed below in OnDraw(). It just draws a triangle with a word at the left side. When mirrored, the word is properly printed backwards on the right side of the screen. In print preview, the triangle is still correct, but the text is no longer mirrored. Any ideas?
TIA
Eric

<br />
   pDC->SetMapMode(MM_TWIPS);<br />
   SetGraphicsMode(pDC->m_hDC, GM_ADVANCED);<br />
   XFORM XForm;<br />
   ::ZeroMemory(&XForm, sizeof(XFORM));<br />
   XForm.eM21 = 0;//shear<br />
   XForm.eM12 = 0;//shear<br />
   <br />
   XForm.eM11 = -1;<br />
   XForm.eM22 = 1;<br />
   XForm.eDx = 3000;<br />
   XForm.eDy = 0;//-1000;<br />
   SetWorldTransform(pDC->m_hDC, &XForm);<br />
<br />
   pDC->MoveTo(500, -300);<br />
   pDC->LineTo(1600, -100);<br />
   pDC->LineTo(1600, -1200);<br />
   pDC->LineTo(500, -300);<br />
   pDC->SetTextColor(RGB(0,0,0));<br />
<br />
   CFont num_font_upper;<br />
      num_font_upper.CreateFont(.4 * 1440 , 0, 0, 0, FW_NORMAL, FALSE, FALSE, 0,<br />
      ANSI_CHARSET, OUT_TT_PRECIS, CLIP_DEFAULT_PRECIS | CLIP_LH_ANGLES,<br />
      DRAFT_QUALITY, VARIABLE_PITCH |FF_SWISS, "Arial");         <br />
   CFont *pFont = pDC->SelectObject(&num_font_upper);<br />
   pDC->TextOut(500,-300, CString("test"));<br />
   pDC->SelectObject(pFont);<br />

CryptGetHashParam

Ni@m7-Jun-04 0:41

Ni@m

7-Jun-04 0:41

::CryptGetHashParam(hHash,HP_HASHSIZE,NULL,ssize,0);
it does not return the size of hash to ssize =((

Re: CryptGetHashParam

Mike Dimmick7-Jun-04 4:57

Mike Dimmick

7-Jun-04 4:57

DWORD dwHashSize = 0;
DWORD cbSizeOfHashSize = sizeof(DWORD);
 
::CryptGetHashParam( hHash, HP_HASHSIZE, &dwHashSize, &cbSizeOfHashSize, 0 );

Stability. What an interesting concept. -- Chris Maunder

Constructor problem - setting members

Anonymous7-Jun-04 0:16

Anonymous

7-Jun-04 0:16

Hello!

I have a class which has two constructors. One is a default and the other is the one I expect to use. In my class I have an COleDateTime member which I want to set in my constructor. I may need several constructors so I set most values in my default constructor and call my default constructor from my other constructors - I think this is OK yes?

But when in my program I create my object like this:

CMyObject *pMyObject = new CMyObject("My Object");

Debugging shows it calls the constructor but the COleDateTime m_Constructed member is not set to the current time. If I set it in the called constructor it is set as I want. Why is it not set if I call the default constructor from within my other constructor? I want it to work like this so that if I have more constructors I can set my members common to all constructors in the default constructor and call the default constructor from each of the other constructors.

Thanks. My code is below as an example:

class CMyObject
{
public:
  CMyObject();
  ~CMyObject(){}
  CMyObject(const char *title);
private:
  CString m_Title;
  COleDateTime m_Constructed; 
};

CMyObject::CMyObject()
{
  m_Title = "";
  m_Constructed = COleDateTime::GetCurrentTime();
}

CMyObject::CMyObject(const char *title)
{
  CMyObject();
  m_Title = title;
}

Re: Constructor problem - setting members

bneacetp7-Jun-04 0:29

bneacetp

7-Jun-04 0:29

My recommendation would be to create a private member function to handle those common instructions. Then call it from each version of your class's constructor. I don't honestly know why your situation doesn't work. Confused | :confused:

Happy Programming and God Bless!

Internet::WWW::CodeProject::bneacetp

Re: Constructor problem - setting members

thowra7-Jun-04 1:01

thowra

7-Jun-04 1:01

In a nutshell, you can't call a constructor from a constructor of the same class if you want to initialise the this object.

In your CMyObject::CMyObject(const char *title) constructor, the line CMyObject(); doesn't call CMyObject::CMyObject() on the this object. Instead it calls CMyObject::CMyObject() to initialise a local, temporary object. This is then destroyed as it goes out of scope when construction ends.

So bneacetp is right when he suggests providing an initialisation function.

"Oh, I'm sick of doing Japanese stuff! In jail we had to be in this dumb kabuki play about the 47 Ronin, and I wanted to be Oshi, but they made me Ori!"

Create a GUID to uniquely identify a machine.

Member 11501767-Jun-04 0:06

Member 1150176

7-Jun-04 0:06

Sir,
I am trying to find a unique machine of the computers listed in my network.
I can do it in 2 ways:By obtaining

1.IPAddress
2.MAC Address

Since IPAddress is subject to change and MAC address changes if there is change in the hardware configuration.

So the only way is to create a GUID of that machine.
The question is how one should go about in creating GUID.

I mean what are the functions should I use?

Is there any API?

I know that 2 utilities like GuidGen.exe and uuidGen.exe create unique GUIDS.

Pls guide

Regards

Re: Create a GUID to uniquely identify a machine.

Anonymous7-Jun-04 1:58

Anonymous

7-Jun-04 1:58

To programmatically create a GUID try calling CoCreateGUID() which can be found in objbase.h.

<code>
HRESULT CoCreateGuid(GUID* pguid);
</code>

Regards,

Re: Create a GUID to uniquely identify a machine.

Joel Lucsy8-Jun-04 2:59

Joel Lucsy

8-Jun-04 2:59

I hate to say this, but I fail to see how a GUID will uniquely identify a machine. In the past, GUID's were based on the MAC address. For security reasons, this is no longer true. As far as I know, it's based off the time and random values.

--
Joel Lucsy

How to set Font of CStatic Control through Program..

Sumit Kapoor6-Jun-04 23:59

Sumit Kapoor

6-Jun-04 23:59

Hi Dear,
How r u?
I use this code..but unable to set font in vc++ dialog box.

CStatic ArrayCaption;
ArrayCaption.Create(NULL,WS_CHILD|WS_VISIBLE,CRect(10,i*17,450,i*17+50),this,123);

ArrayCaption.SetWindowText("Sumit Kapoor");

I use
ArrayCaption.SetFont(&cFont1)
but that is not working

Any Hint please..
Thanks

---Sumit Kapoor---

Re: How to set Font of CStatic Control through Program..

bneacetp7-Jun-04 0:18

bneacetp

7-Jun-04 0:18

Declare the fonts of the CFont type that you need in your dialog's class. Then in your class's OnInitDialog() function, define your font's style and then:

GetDlgItem(<controlIDHere> )->SetFont(<fontnamehere> );

That should do it. Smile | :)

Happy Programming and God Bless!

Internet::WWW::CodeProject::bneacetp

Re: Still not work...also

Sumit Kapoor7-Jun-04 0:34

Sumit Kapoor

7-Jun-04 0:34

Hi..thanks for reply....

I create font by using this code:

CFont font;
LOGFONT lf;
memset(&lf, 0, sizeof(LOGFONT)); // zero out structure
lf.lfHeight = 22;
// request a 12-pixel-height font
strcpy(lf.lfFaceName, "Arial"); // request a face name "Arial"
font.CreateFontIndirect(&lf); // create the font

//then create

CStatic ArrayCaption;
ArrayCaption.Create(NULL,WS_CHILD|WS_VISIBLE,CRect(10,17,450,65),this,123);

ArrayCaption.SetWindowText("Sumit Kapoor");
// mine try...
//ArrayCaption.SetFont(&font)

// then your hint one but not working
GetDlgItem(123)->SetFont(&font);

you can copy paste this code & check..if doubt...
Thanks for help..bye

---Sumit Kapoor---

Re: Still not work...also

Johan Rosengren7-Jun-04 3:26

Johan Rosengren

7-Jun-04 3:26

font is not exactly a member of your class, is it?

Do as suggested and create a CFont member variable. GetDlgItem will do the same as the direct reference ArrayCaption, so you should keep the ArrayCaption.SetFont - but have the class member as i parameter, of course. Remove SetDlgItem.

Re: Forget ALSO...

Sumit Kapoor7-Jun-04 0:36

Sumit Kapoor

7-Jun-04 0:36

I forget what's in Also...

I want different font in my dialog..one line with one font & other with onother font...

Bye

---Sumit Kapoor---

Re: Forget ALSO...

jmkhael7-Jun-04 4:50

jmkhael

7-Jun-04 4:50

Create your fonts on the Heap (using new)
Dont forget to delete (push in a list or something)

Papa

while (TRUE)
Papa.WillLove ( Bebe ) ;

Navigating through CForimView controls

dart136-Jun-04 23:59

dart13

6-Jun-04 23:59

How to implement movement between button controls placed on a CFormView with arrow keys? Buttons are positioned like chessboard squares - so when the arrow key for left is pressed the focus should move to the button placed left and so on.
Should SetFocus() be overriden?

Re: Navigating through CForimView controls

Johan Rosengren7-Jun-04 6:10

Johan Rosengren

7-Jun-04 6:10

I have difficulties seeing what SetFocus should accomplish Smile | :)

You can, for example, add the arrow keys as accelerators in the accelerator table and map them to functions in your view.

Re: Navigating through CForimView controls

dart138-Jun-04 1:07

dart13

8-Jun-04 1:07

I just want to move focus from one button to another, so the desired button can be activated by pressing ENTER.
It is possible to move focus with TAB key as well as with arrow keys, but focus goes from one button to the other as it was set in Layout -> Tab Order.
What I want to accomplish is to move focus in one of four directions using arrow keys, but I am not sure what's the best way to implement this behaviour.

Re: Navigating through CForimView controls

Johan Rosengren8-Jun-04 1:24

Johan Rosengren

8-Jun-04 1:24

dart13 wrote:
What I want to accomplish is to move focus in one of four directions using arrow keys

I understood that much, and I really think that you should try with accelerators. In the view - where you handle the message - you might want to check what control currently has the focus, and change it according to the pattern you want.

It is a button having the focus when the key is pressed, and therefore the keypress will be sent to the button (actually, the key up message will be sent... to the button the focus was moved to!). Therefore, the most basic place to handle this would be in a CButton-derived class.

But it is not a good way to solve the problem!

If you try handling the focus setting itself, you'll get into all sorts of grief, as changing the focus in a focus-handler (that is, a handler to WM_SETFOCUS) will most probably get you in trouble.

Furthermore, if you handle this from the buttons themselves, you'll have to post messages to the owner anyway, as an individual button will have no knowledge of the other buttons on the view.

So, accelerators!

Prblm in video capturing

Zeeshan Bilal6-Jun-04 23:32

Zeeshan Bilal

6-Jun-04 23:32

HI,

MY application (build with DirectShow and VC++) working fine to capture video

but a problm is I m using TV CARD + camera to capture video........

When my Computer Restarts or Reboots or i restart it after Shutting down

i need to run first Software of TV CARD ( ITS murcery Tv CArd)

then after closing it (TV card software)

I run my application ,,,, it works fine. and till again shutdown of Computer it works fine

IF i not run TV CARD software ,, My application not capture the video ..

I want to remove the dependency on TV CARD SOFTWARE..Y my application need to run it first ...

WT is the problm ,, is the TV cARD software DLLs load problm...

PLZ help me or any sampl code zahid_ash@hotmail.com

thanx ..

Retrieving control's original class by its ID?

Daredevil6-Jun-04 23:13

Daredevil

6-Jun-04 23:13

Hello,
In my program I dynamically create controls according to data read from a database. The control can be either CEdit or CComboBox. I also assign a unique control ID to each of the created controls (I know the ids).

Once controls created when a button pressed it's supposed to save controls values in the database.

Getting the text from the CEdit control isn't a problem as I just do GetDlgItemText(...). However, in case of the CComboBox I need to retrieve the ItemData using GetItemData. This is where I'm unsure of what to do.
I don't save anywhere if control with specific ID is a CComboBox or CEdit. Is is possible to know only by ID what kind of a control it is and to retrieve its original class?.

I was thinking just to make a struct:
struct {
CEdit *edit=NULL;
CComboBox *combo=NULL;
} myDynControls;

and then make an array of this struct. Each coresponding to an ID. I won't have more than 10 controls at a time.

What do you think? Is it a good idea? (i will delete everything after done working with ofcourse Smile | :)

)

Re: Retrieving control's original class by its ID?

Andrew Quinn AUS6-Jun-04 23:33

Andrew Quinn AUS

6-Jun-04 23:33

Hi Daredevil,

All MFC classes that derive from CObject (of which CWnd does) have a CRuntimeClass object associated with it.
So to see if your object is a CEdit control:

CWnd* pWndControl = m_arrMyControls[i]; // or however you've implemented the collection of controls
if (pWndControl && pWnd->GetSafeHwnd())
{
 CRuntimeClass* pClass = pWnd->GetRuntimeClass();
     // MSDN says that pClass will never be NULL, but we should always check pointers before use
     if (pClass)
     {
     CString strName = pClass->m_lpszClassName;
         // Now you can do whatever you need to do based on what the runtime class is
         // ...
         // ...
         // ...
     }
}

Hope this helps,
Andy

Re: Retrieving control's original class by its ID?

David Crow7-Jun-04 2:10

David Crow

7-Jun-04 2:10

How about using IsKindOf()?

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

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