Re: Check for empty buffer - C / C++ / MFC Discussion Boards

Re: Is there a way to draw standard controls to bitmap if they aren't on the screen?

Entrase4-May-09 2:30

Entrase

4-May-09 2:30

I do need per-pixel alpha for some skinning engine Smile | :)

So if control overrides alpha then I have to make one more bitmap (24 bpp) and then blit it to my 32b buffer? Or there is simpler solution?

Re: Is there a way to draw standard controls to bitmap if they aren't on the screen?

Code-o-mat4-May-09 2:33

Code-o-mat

4-May-09 2:33

How about filling the alpha channel after you rendered your controls?

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Life: great graphics, but the gameplay sux. <

Check for empty buffer

CodingLover30-Apr-09 18:49

CodingLover

30-Apr-09 18:49

Hi All,

On a TCHAR buffer I've some data. I want to check them either empty or not, the content.

I tried this.

<br />
TCHAR szMyBuffer[128];<br />
<br />
if(szMyBuffer != L"")<br />
   // Do the process<br />

But this is not work, what can I do on that?

Thanks a lot

I appreciate your help all the time...
CodingLover Smile | :)

Re: Check for empty buffer

Joe Woodbury30-Apr-09 19:15

Joe Woodbury

30-Apr-09 19:15

You are checking the address of the buffer, you need to check the contents. Try:

~~if (!szMyBuffer[0])~~

if (szMyBuffer[0])

(Sorry for the brain freeze.)

Anyone who thinks he has a better idea of what's good for people than people do is a swine.
- P.J. O'Rourke

Re: Check for empty buffer

CPallini30-Apr-09 23:00

CPallini

30-Apr-09 23:00

It's quite the opposite (i.e. if (szMyBuffer[0])).
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]

Re: Check for empty buffer

Rajesh R Subramanian30-Apr-09 23:40

Rajesh R Subramanian

30-Apr-09 23:40

Well, you both are right, it is a matter of "where" you handle the error. Some people go by that style, Carlo. Smile | :)

It is a crappy thing, but it's life -^ Carlo Pallini

Re: Check for empty buffer

CPallini30-Apr-09 23:47

CPallini

30-Apr-09 23:47

Rajesh R Subramanian wrote:
Some people go by that style, Carlo.

I use that style too. However, OP was asking for

if(szMyBuffer != L"")
// Do the process

replacement.

--Carlo the Nitpick.
Smile | :)

Re: Check for empty buffer

Rajesh R Subramanian30-Apr-09 23:57

Rajesh R Subramanian

30-Apr-09 23:57

I agree, but he might have meant to handle the error with if and write the processing code into else. Just that he wasn't clear with it.

But OK, you win today. Laugh | :laugh:

It is a crappy thing, but it's life -^ Carlo Pallini

Re: Check for empty buffer

Fernando A. Gomez F.30-Apr-09 19:55

Fernando A. Gomez F.

30-Apr-09 19:55

You could also try

if (_tcslen(szMyBuffer) > 0)
   // do the process

About _tcslen[^]

Stupidity is an International Association - Enrique Jardiel Poncela

Re: Check for empty buffer

Joe Woodbury3-May-09 14:17

Joe Woodbury

3-May-09 14:17

I hate that construct. Why do a CRT call when all that matters is the first character?

Anyone who thinks he has a better idea of what's good for people than people do is a swine.
- P.J. O'Rourke

Re: Check for empty buffer

Fernando A. Gomez F.3-May-09 17:47

Fernando A. Gomez F.

3-May-09 17:47

Personally, because it's clearer to read. I gave another option, and so did others. Let the OP decide.

Stupidity is an International Association - Enrique Jardiel Poncela

Re: Check for empty buffer

Eytukan30-Apr-09 20:28

Eytukan

30-Apr-09 20:28

CodingLover wrote:
if(szMyBuffer != L"")

As Joe said, this isn't the buffer itself. You cannot check using the == operator.
If you are using std::string or CString, you could. That too I'd prefer checking their lengths. For buffers you could use CRT routines :
MSDN[^]

Starting to think people post kid pics in their profiles because that was the last time they were cute - Jeremy.

Re: Check for empty buffer

CPallini30-Apr-09 22:58

CPallini

30-Apr-09 22:58

if (*szMyBuffer)
// Do the process

Convert Ascii to hex.and hex to decimal.

Le@rner30-Apr-09 18:39

Le@rner

30-Apr-09 18:39

Hi all,

i have an ascii value in unsigned char* buffer, i want to convert it in Hex.

please tell me how can i convert it in hex.

and i also want to convert hex values in decimal .

so please tell me how can i do this.

thanks in advance.

To accomplish great things, we must not only act, but also dream;
not only plan, but also believe.

Re: Convert Ascii to hex.and hex to decimal.

Rajesh R Subramanian30-Apr-09 20:47

Rajesh R Subramanian

30-Apr-09 20:47

If you are using CString, then you haven't read my previous reply to you, a few days ago: printf tutorial for you[^]

If you are not using MFC, still still MUST read the printf tutorial and you can use _stprintf[^]

It is a crappy thing, but it's life -^ Carlo Pallini

Re: Convert Ascii to hex.and hex to decimal.

Le@rner30-Apr-09 20:49

Le@rner

30-Apr-09 20:49

thanks

To accomplish great things, we must not only act, but also dream;
not only plan, but also believe.

Re: Convert Ascii to hex.and hex to decimal.

Rajesh R Subramanian30-Apr-09 23:59

Rajesh R Subramanian

30-Apr-09 23:59

If you actually wanted to be thankful, I'll be glad if you can please read the tutorials that you're asked to.

It is a crappy thing, but it's life -^ Carlo Pallini

How to put a dialog into CDockablePane?

eight30-Apr-09 8:50

eight

30-Apr-09 8:50

What I'm trying to do is create a dialog resource, assign some buttons and edit boxes on it and attach it to a CDockablePane object so that I can dock the dialog. How can I do this?

Re: How to put a dialog into CDockablePane?

David Crow30-Apr-09 8:59

David Crow

30-Apr-09 8:59

eight wrote:
How can I do this?

Which part exactly?

"Old age is like a bank account. You withdraw later in life what you have deposited along the way." - Unknown

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

Re: How to put a dialog into CDockablePane?

Maximilien30-Apr-09 9:27

Maximilien

30-Apr-09 9:27

I've done this recently
In the OnCreate of your derived CDockablePane class, create a dialog with this as the parent of the dialog.

something like :

int YouDerivedClass::OnCreate(LPCREATESTRUCT lpCreateStruct) 
{
  if (CDockablePane::OnCreate(lpCreateStruct) == -1)
    return -1;

  m_YourDialog.Create(IDD_SOMETHING, this);
  //...
}

Do forget to set the style of your dialog to childand no border

This signature was proudly tested on animals.

Re: How to put a dialog into CDockablePane?

eight1-May-09 5:18

eight

1-May-09 5:18

Here are the steps that I took.

1. I've created a new MFC SDI project (DialogDockableTester), with Visual Studio style, maximized, and with ribbons.
2. I've created a dialog, IDD_TEMPDLG. Border = None, Style = Child.
3. Added class CTempDlg : public CDialog to use IDD_TEMPDLG
4. Added class CMyDockablePane : public CDockablePane
5. Added an object of CTempDlg, m_TempDlg in CDialogDockableTesterView
6. Overridden CMyDockablePane::OnCreate(LPCREATESTRUCT lpCreateStruct) with this

int CMyDockablePane::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
	if (CDockablePane::OnCreate(lpCreateStruct) == -1)
		return -1;

	m_TempDlg.Create(IDD_TEMPDLG, this);

	return 0;
}

7. Added an object of CMyDockablePane, m_MyDockablePane in CMainFrame
8. Added this line in CMainFrame::OnCreate

int CMainFrame::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
        :
	:
	if (!m_MyDockablePane.Create(_T("MyDockablePane"), this, CRect(0, 0, 200, 200), TRUE, 100, WS_CHILD | WS_VISIBLE | 	WS_CLIPSIBLINGS | WS_CLIPCHILDREN | CBRS_BOTTOM | CBRS_FLOAT_MULTI))
	{
		return FALSE; // failed to create
	}
	m_MyDockablePane.EnableDocking(CBRS_ALIGN_ANY);
	DockPane(&m_MyDockablePane);
        return 0;
}

Still can't get it to work. Am I missin something?

Re: How to put a dialog into CDockablePane?

Maximilien1-May-09 5:47

Maximilien

1-May-09 5:47

I just retried with a simple project, and I had to set the dialog visiblity.

int MyPage::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
	if (CDockablePane::OnCreate(lpCreateStruct) == -1)
		return -1;

	BOOL bRet = myDialog.Create(IDD_DIALOG1, this);
	ASSERT( bRet );
	myDialog.ShowWindow(SW_SHOW);
	return 0;
}

In my mainframe :

int CMainFrame::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
	if (CMDIFrameWndEx::OnCreate(lpCreateStruct) == -1)
		return -1;

	CMFCVisualManager::SetDefaultManager(RUNTIME_CLASS(CMFCVisualManagerWindows));

	CMDITabInfo mdiTabParams;
	mdiTabParams.m_style = CMFCTabCtrl::STYLE_3D_ONENOTE;
	mdiTabParams.m_bActiveTabCloseButton = TRUE;
	mdiTabParams.m_bTabIcons = FALSE;
	mdiTabParams.m_bAutoColor = TRUE;
	mdiTabParams.m_bDocumentMenu = TRUE;
	EnableMDITabbedGroups(TRUE, mdiTabParams);

// ....

	CString s2("Page");
	if (!myPage.Create(s2, this, CRect(0, 0, 200, 200), TRUE, ID_OPERATION_PAGE, WS_CHILD | WS_VISIBLE | WS_CLIPSIBLINGS | WS_CLIPCHILDREN | CBRS_LEFT| CBRS_FLOAT_MULTI))
	{
		TRACE0("Failed to create objectPage\n");
		return FALSE; // failed to create
	}


	myPage.EnableDocking(CBRS_ALIGN_ANY);
	DockPane(&myPage);

	CDockingManager::SetDockingMode(DT_SMART);
	EnableAutoHidePanes(CBRS_ALIGN_ANY);
//...

This signature was proudly tested on animals.

Re: How to put a dialog into CDockablePane?

eight1-May-09 8:58

eight

1-May-09 8:58

When I add the line

myDialog.ShowWindow(SW_SHOW);

It works! Thanks Maximilien. Smile | :)

Re: How to put a dialog into CDockablePane?

ima2401098-Nov-09 2:20

ima240109

8-Nov-09 2:20

hi,
i've followed your step to pu dialog in dockpane but i can't see the dialog, i don't know how to fix this problem
Here are the steps that I took.

1. I've created a new MFC MDI project (DialogDockableTester), with Visual Studio style, maximized, and with ribbons.
2. I've created a dialog, IDD_TEMPDLG. Border = None, Style = Child.
3. Added class CTempDlg : public CDialog to use IDD_TEMPDLG
4. Added class CMyDockablePane : public CDockablePane
5. Overridden CMyDockablePane::OnCreate(LPCREATESTRUCT lpCreateStruct) with this
int CMyDockablePane::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
if (CDockablePane::OnCreate(lpCreateStruct) == -1)
return -1;

BOOL bRet = m_TempoDlg.Create(IDD_TEMPDLG, this);
ASSERT( bRet );
m_TempoDlg.ShowWindow(SW_SHOW);
return 0;

}
6. Added an object of CMyDockablePane, m_MyDockablePane in CMainFrame
7. Added this line in CMainFrame::OnCreate
int CMainFrame::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
// ....

CString s2("Page");
if (!myPage.Create(s2, this, CRect(0, 0, 200, 200), TRUE, ID_OPERATION_PAGE, WS_CHILD | WS_VISIBLE | WS_CLIPSIBLINGS | WS_CLIPCHILDREN | CBRS_LEFT| CBRS_FLOAT_MULTI))
{
TRACE0("Failed to create objectPage\n");
return FALSE; // failed to create
}

myPage.EnableDocking(CBRS_ALIGN_ANY);
DockPane(&myPage);

CDockingManager::SetDockingMode(DT_SMART);
EnableAutoHidePanes(CBRS_ALIGN_ANY);
//...

}

in your steps you added an object of CTempDlg, m_TempDlg in CDialogDockableTesterView, and i don'nt know how to use m_TempDlg in CDialogDockableTesterView.cpp

Am I missin something?

Re: How to put a dialog into CDockablePane?

eight9-Nov-09 18:31

eight

9-Nov-09 18:31

I've recreated your project based on the given codes and it works. IDD_TEMPDLG is visible on the left side of the screen. An idea, CDockablePane state is automatically saved in the registry. If you're familiar with registry, you might want to delete "HKEY_CURRENT_USER > Software > Local App-Wizard Generated Applications > DialogDockableTester".

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