How to Convert HDC to CDC?

[TooShy2Talk]

Hi guyz, Is it possible to convert HDC to CDC? When I pass CDC to other class I use its HDC, CDC->m_hDC this is to perform the process in there. Rather, I need a way to convert HDC to CDC and make some drawing over it. Now I'm encountering a problem integrating a CDC with the returned HDC. I needed the HDC as my background and the CDC for the drawing like lines. If you have an idea please let me know. Thank you

[zzangcorea]

Hi man. I know how to convert it is. show below if your handle is m_hDC, CDC* pCDC = CDC::FromHandle(m_hDC); Ok. You can get the CDC* from m_hDC

[Stephen Hewitt]

That will only work if the HDC is already wrapped by a CDC. To wrap a HDC in a CDC use the CDC::Attach method.

Steve

[Stephen Hewitt]

To wrap a HDC in a CDC use the CDC::Attach method. If the HDC is already wrapped by a CDC use the CDC::FromHandle method, as mentioned by the first replier.

Steve

[TooShy2Talk]

Thank you very much for your replies. I will try this now.

[led mike]

Stephen Hewitt wrote:

To wrap a HDC in a CDC use the CDC::Attach method. If the HDC is already wrapped by a CDC use the CDC::FromHandle method,

If Microsoft ever starts documenting that stuff CodeProject traffic would really decrease. ;P

led mike

[ThatsAlok]

CDC construtor is of any help??

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Never mind - my own stupidity is the source of every "problem" - Mixture

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[Hamid Taebi]

And see this[^] thread.

[Rajkumar R]

May be i understood wrongly, CDC::FromHandle() "If a CDC object is not attached to the handle, a temporary CDC object is created and attached." from msdn.