How to using GDI+ in Dialog-Based ActiveX

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C#

void CMFC_ActiveXCtrl::OnDraw(
            CDC* pdc, const CRect&amp; rcBounds, const CRect&amp; rcInvalid)
{
    // TODO: Replace the following code with your own drawing code.
//  m_MfcDlg.MoveWindow(rcBounds,TRUE);
//  InvalidateControl(rcBounds,TRUE);
    m_MfcDlg.m_Static.MoveWindow(CRect(rcBounds.left,rcBounds.top,rcBounds.Width()-18,rcBounds.Height()-18),TRUE);
    m_MfcDlg.SetWindowPos(NULL,rcBounds.left,rcBounds.top,rcBounds.Width(),rcBounds.Height(),SWP_NOMOVE);
}

void CMFC_Dialog::OnPaint() 
{
	CPaintDC dc(this); // device context for painting
	
	// TODO: Add your message handler code here
	GetDlgItem(IDC_DISPLAY_IMAGE)->GetClientRect(&m_rectClientRect);

//	CDC *lPdc = GetDlgItem(IDC_DISPLAY_IMAGE)->GetDC();

//	lPdc->Rectangle(m_rectClientRect.left+20,m_rectClientRect.top+20,m_rectClientRect.right-20,m_rectClientRect.bottom-20);

	Graphics lGraphics(GetDlgItem(IDC_DISPLAY_IMAGE)->GetDC()->m_hDC);

	Pen pen(Color(255,255,0));

	lGraphics.DrawRectangle(&pen,Rect(10,10,200,200));


	// Do not call CDialog::OnPaint() for painting messages
}

When I use this in ActiveX Container,My Application Collapsed.Who can tell me how to use GDI+ in Dialog-Based ActiveX.THANKS!

Posted 29-Aug-10 23:33pm

apriltommy

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Niklas L · Accepted Answer · 2010-08-29T23:45:00

Solution 1

Are you sure you initialized GDI+ correctly in the ActiveX solution?

Posted 29-Aug-10 23:45pm

Niklas L

Comments

apriltommy 30-Aug-10 7:04am

I use the class below to initialize GDI+
class CGdiPlusCtrl
{
public:
void DeInitializeGdiPlus();
void InitializeGdiPlus();
CGdiPlusCtrl();
virtual ~CGdiPlusCtrl();
private:
HANDLE m_hMap;

bool m_bInited, m_bInitCtorDtor;

ULONG_PTR m_gdiplusToken;

GdiplusStartupInput m_gdiplusStartupInput;

long m_initcount;

};
CGdiPlusCtrl::CGdiPlusCtrl():m_bInitCtorDtor(false),
m_bInited(false),
m_hMap(NULL),
m_gdiplusStartupInput(NULL),
m_gdiplusToken(NULL),
m_initcount(0)
{
if(m_bInitCtorDtor)
InitializeGdiPlus();
}

CGdiPlusCtrl::~CGdiPlusCtrl()
{
if (m_bInitCtorDtor)
DeInitializeGdiPlus();
}

void CGdiPlusCtrl::InitializeGdiPlus()
{
if (!m_bInited)
{
char buffer[1024];
sprintf(buffer,"GDIPlusInitID = %x",GetCurrentProcessId());
m_hMap = CreateFileMapping((HANDLE)INVALID_HANDLE_VALUE,NULL,PAGE_READWRITE|SEC_COMMIT,0,sizeof(long),buffer);
if (m_hMap == NULL)
{
if (GetLastError() == ERROR_ALREADY_EXISTS)
{
CloseHandle(m_hMap);
}
else
{
m_bInited = true;
GdiplusStartup(&m_gdiplusToken,&m_gdiplusStartupInput,NULL);
TRACE("GdiPlus Inited!
");
}
}
}
m_initcount++;
}

void CGdiPlusCtrl::DeInitializeGdiPlus()
{
m_initcount--;
if (m_bInited == true || m_initcount !=0)
{
TRACE("GdiPlus ShutDown!
");
GdiplusShutdown(m_gdiplusToken);
m_bInited = false;
CloseHandle(m_hMap);

}
}

apriltommy 30-Aug-10 7:12am

THANK YOU!
I put the initialization in the WRONG palce.