How can i get cwnd from a cdc ?

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in the name of allah

have a good time

i work with visual c++ 2012.

how can i get the "CWnd" from a "CDC" in an ActiveX project?

thanks

What I have tried:

i've tried bellow code but doesn't work.

void CLanxXCtrl::OnDraw(
CDC* pdc, const CRect& rcBounds, const CRect& rcInvalid)
{

HWND h=WindowFromDC(pdc->m_hDC);
CWnd *w=CWnd::FromHandle(h);

...
}

this CWnd will work but cause of the ActiveX in Project is not visible, the OnDraw function doesn't work in run time.

how can i do that?

Posted 24-Feb-16 18:12pm

Mahdi Nejadsahebi

Updated 24-Feb-16 20:23pm

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Aescleal · Answer 1 · 2016-02-24T20:23:00

Solution 1

You've already got a pointer to the MFC window object associated with the CDC - it's the this pointer for the function you're calling.

Posted 24-Feb-16 20:23pm

Aescleal

Comments

Mahdi Nejadsahebi 25-Feb-16 7:53am

dear friend
i also use the "this" but when the application(VB.net) will be opened, error will happen.

Aescleal 25-Feb-16 13:38pm

It sounds like you've got a more severe error. OnDraw will only be called if a WM_PAINT is received by the window. Check that your code is not doing something brain damaged like calling OnDraw manually anywhere as that'll just end in tears.