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Texture not showed when render on memory bitmap

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In Windows system, Texture show ok when render on window dc, but Texture not showed when render on memory bitmap?

I need generate a memory bitmap for ::UpdateLayerWindow, with WS_EX_LAYERED syte window.

Thank you!


	HDC hDC = ::GetDC(m_hWnd);
#if 0 // Texture show ok.
		return 0;
		return 0;

	//::ReleaseDC(m_hWnd, hDC);
#else // Texture not showed.
	m_hDCMem = ::CreateCompatibleDC(hDC);

	CRect rcWnd;
	LPBYTE pbits = NULL;
	m_hbmpMem = CreateDIBSection(rcWnd.Width(), rcWnd.Height(), 32, (LPVOID *)&pbits);
	HGDIOBJ hbmpOld = ::SelectObject(m_hDCMem, m_hbmpMem);

		return 0;

		return 0;

	::ReleaseDC(m_hWnd, hDC);


// some paint code
glBindTexture(GL_TEXTURE_2D, texName);

			glTexCoord2f(0.0, 0.0);
			glVertex3f(-8.0f,-8.0f, 0.0);
			glTexCoord2f(1.0, 0.0);
			glTexCoord2f(1.0, 1.0);
			glVertex3f(8.0f,8.0f, 0.0);
			glTexCoord2f(0.0, 1.0);


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