C / C++ / MFC

16-Mar-14 21:07

Hi friends & Gurus,

May i know is visual c++ 6 is free downloadable / freeware ?
Please update me the details.

Thanks & Regards,
TV Krishna Rayalu

CPallini16-Mar-14 22:25

CPallini

16-Mar-14 22:25

It is neither freeware nor downlodable.

Veni, vidi, vici.

KrishnaRayalu_Talisetti16-Mar-14 23:45

16-Mar-14 23:45

Thank you. But VB 6 is freeware it seems. correct me if iam wrong.

CPallini16-Mar-14 23:54

CPallini

16-Mar-14 23:54

As far as I know VB6 is NOT free.

Veni, vidi, vici.

Jochen Arndt16-Mar-14 22:32

Jochen Arndt

16-Mar-14 22:32

VC6 is not free. There were special versions for publication on media of C/C++ books. So you might get such a book to get the special VC6 version for non-commercial purposes (compiled programs will show a message at each start).

But VC 6 is outdated. There is no reason to use it anymore.

If you are looking for a free Visual Studio version, you can download the Express versions from Microsoft at http://www.visualstudio.com/downloads/download-visual-studio-vs[^].

KrishnaRayalu_Talisetti16-Mar-14 23:48

16-Mar-14 23:48

Thank you Jochen, i need it for commercial purpose. It is for very old Visualstudio 6 project maintenence purpose i required vc++6.

Jochen Arndt17-Mar-14 0:04

Jochen Arndt

17-Mar-14 0:04

If you don't want to convert the project to a newer VC version (which may be difficult), you can look for a used version. But note that those may not include the latest service packs (SP5 from 2003 and SP6 from 2004).

KrishnaRayalu_Talisetti17-Mar-14 0:46

17-Mar-14 0:46

Thanks for the precautions i need to take , if it need to be upgrade.
But as of now it is just support work.

MFC CreateCompatibleDC(), Drawtext() no display [Solved]

Albert Holguin17-Mar-14 12:37

Albert Holguin

17-Mar-14 12:37

When I've had to use really old versions of something... I've gone to ebay and looked there. The other way would be if you have an MSDN subscription, since MS usually makes all versions of their IDEs available to developers to download through there, but a subscription is pricey to begin with (you'll likely find it cheaper through some third party online).

econy16-Mar-14 16:23

Re: MFC CreateCompatibleDC(), Drawtext() no display

16-Mar-14 16:23

In OnTimer, I write a test program. if I don't use CreateCompatibleDC(), It works well, otherwise, no display.
Please help me to find the reason.

C++

void CDynamicShowTextDlg::OnTimer(UINT nIDEvent)
{ 
    CDC *pDC; 
    CRect tRect;
    CDC   MemDC; 

    pDC = this->GetDC();	
    GetClientRect(&tRect);
    MemDC.CreateCompatibleDC(NULL); 
    MemDC.SetBkMode(TRANSPARENT);
    if (test == 0 ){
	MemDC.SetTextColor(RGB(255,255,255));
	MemDC.DrawText(_T("My Test"),&tRect,DT_CENTER|DT_VCENTER|DT_SINGLELINE);
	MemDC.SetTextColor(RGB(255,0,0));
	MemDC.DrawText(_T("TEST"),&tRect,DT_CENTER|DT_VCENTER|DT_SINGLELINE);

	//pDC->SetTextColor(RGB(255,255,255));
	//pDC->DrawText(_T("My Test"),&tRect,DT_CENTER|DT_VCENTER|DT_SINGLELINE);
	//pDC->SetTextColor(RGB(255,0,0));
	//pDC->DrawText(_T("TEST"),&tRect,DT_CENTER|DT_VCENTER|DT_SINGLELINE);
    }
    else  {
	MemDC.SetTextColor(RGB(255,255,255));
	MemDC.DrawText(_T("TEST"),&tRect,DT_CENTER|DT_VCENTER|DT_SINGLELINE);
	MemDC.SetTextColor(RGB(0,150,0));
	MemDC.DrawText(_T("My Test"),&tRect,DT_CENTER|DT_VCENTER|DT_SINGLELINE);

	//pDC->SetTextColor(RGB(255,255,255));
       //pDC->DrawText(_T("TEST"),&tRect,DT_CENTER|DT_VCENTER|DT_SINGLELINE);
	//pDC->SetTextColor(RGB(0,150,0));
	//pDC->DrawText(_T("My Test"),&tRect,DT_CENTER|DT_VCENTER|DT_SINGLELINE);
    }
	
	m_Seconds++;
	m_TimerEcho.Format(_T("%d: Seconds have passed"), m_Seconds); 
	test ^= 1;
	
   MemDC.DeleteDC();
   ReleaseDC(pDC);
   UpdateData(FALSE);
}

with pDC, it works well.

modified 17-Mar-14 11:40am.

CPallini16-Mar-14 23:41

CPallini

16-Mar-14 23:41

You can see drawing operations occurred into a memory device context only if you BitBlt it to a 'standard' device context (see, for instance "CDC::CreateCompatibleDC" at MSDN[^].

Veni, vidi, vici.

Re: MFC CreateCompatibleDC(), Drawtext() no display

econy17-Mar-14 3:01

Re: MFC CreateCompatibleDC(), Drawtext() no display

17-Mar-14 3:01

I added a statement:

C++

int nX = tRect.left + tRect.Width() / 2;
int nY = tRect.top +  tRect.Height() / 2;
pDC->BitBlt(nX, nY, tRect.Width()/3, tRect.Height()/3, &MemDC, 
         0, 0, SRCCOPY);

But still get nothing on the screen.

C^hris L^osinger17-Mar-14 3:33

C^hris L^osinger

17-Mar-14 3:33

you need to create a bitmap for your memdc to draw on.

see MSDN dox for CDC::CreateCompatibleDC:

http://msdn.microsoft.com/en-us/library/kwxzck32.aspx[^]

from the dox:

When a memory device context is created, GDI automatically selects a 1-by-1 monochrome stock bitmap for it. GDI output functions can be used with a memory device context only if a bitmap has been created and selected into that context.

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Re: MFC CreateCompatibleDC(), Drawtext() no display

econy17-Mar-14 4:09

Re: MFC CreateCompatibleDC(), Drawtext() no display

17-Mar-14 4:09

Thanks, now the test string appeared.
But, the client area is black, and show text string in while color only, no change.
Please refer to the code:

C++

void CDrawTextTstDlg::OnTimer(UINT_PTR nIDEvent)
{
CDC *pDC; 
CRect tRect;
CDC   MemDC; 

pDC = this->GetDC();	
GetClientRect(&tRect);
MemDC.CreateCompatibleDC(NULL); 
	
CBitmap bmp;
bmp.CreateCompatibleBitmap(&MemDC, tRect.Width(), tRect.Height());
CBitmap *oldBitmap = MemDC.SelectObject(&bmp);
MemDC.SetBkMode(TRANSPARENT);
	
if (gtest == 0 ){
        MemDC.SetTextColor(RGB(255,255,255));
	MemDC.DrawText(_T("My Test"),&tRect,DT_CENTER|DT_VCENTER|DT_SINGLELINE);
	MemDC.SetTextColor(RGB(255,0,0));
		       MemDC.DrawText(_T("TEST"),&tRect,DT_CENTER|DT_VCENTER|DT_SINGLELINE);
}
else  {
	MemDC.SetTextColor(RGB(255,255,255));
		MemDC.DrawText(_T("TEST"),&tRect,DT_CENTER|DT_VCENTER|DT_SINGLELINE);
MemDC.SetTextColor(RGB(0,150,0));
MemDC.DrawText(_T("My Test"),&tRect,DT_CENTER|DT_VCENTER|DT_SINGLELINE);

}
	
pDC->BitBlt(0, 0, tRect.Width(), tRect.Height(), &MemDC, 
         0, 0, SRCCOPY);
m_Seconds++;
m_TimerEcho.Format(_T("%d: Seconds have passed"), m_Seconds); 
gtest ^= 1;
	
MemDC.SelectObject(oldBitmap);
bmp.DeleteObject();
MemDC.DeleteDC();
ReleaseDC(pDC);

CDialog::OnTimer(nIDEvent);
}

C^hris L^osinger17-Mar-14 4:21

C^hris L^osinger

17-Mar-14 4:21

bmp.CreateCompatibleBitmap(&MemDC, tRect.Width(), tRect.Height());

instead of MemDC there, use the DC that you used as the source for CreateCompatibleDC.

when a memory DC is created, it has a 1x1 pixel monochrome bitmap selected into it. if you create a bitmap compatible with that, you'll get a monochrome bitmap.

also, if you want a background color, you'll need to fill the bitmap with that color (CDC::FillSolidRect)

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Re: MFC CreateCompatibleDC(), Drawtext() no display

econy17-Mar-14 4:30

Re: MFC CreateCompatibleDC(), Drawtext() no display

17-Mar-14 4:30

Thank you very much.
Now I can see the Text string color is changing.
While, the whole dialog screen is black too, some controls, static texts all disappeared.

Do I need to redraw all the controls like DrawText() ? and then BitBlt()?

The original dialog screen is white.

C^hris L^osinger17-Mar-14 5:02

C^hris L^osinger

17-Mar-14 5:02

whenever i need to draw on a dialog, i put a static 'frame' control in the place where i want to draw. then i get that control's rectangle and limit my drawing to that rect.

CRect outRect;
m_myDrawingRectControl.GetWindowRect(outRect);
ScreenToClient(outRect);

also, you should only do drawing in your CDialog's OnPaint method. if you need to trigger drawing from a timer, just call CDialog::InvalidateRect() with your control's rectangle (as above).

so:

void CDynamicShowTextDlg::OnTimer(UINT nIDEvent)
{ 
   CRect outRect;
   m_myDrawingRectControl.GetWindowRect(outRect);
   ScreenToClient(outRect);

   InvalidateRect(outRect);
}


void CDynamicShowTextDlg::OnPaint() 
{
     if (IsIconic())
     {
     ...}
   else
   {
      CRect outRect;
      m_myDrawingRectControl.GetWindowRect(outRect);
      ScreenToClient(outRect);

      CPaintDC dc(this); // device context for painting

      ...
do your drawing here.
use dc as the source for your CreateCompatible* stuff
     ...
      CDialog::OnPaint();
     }

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Re: MFC CreateCompatibleDC(), Drawtext() no display

econy17-Mar-14 5:06

Re: MFC CreateCompatibleDC(), Drawtext() no display

17-Mar-14 5:06

Very very appreciate your help.

econy17-Mar-14 5:19