透明COM容器控件原理

来源：互联网发布：淘宝上的息肌丸靠谱吗编辑：程序博客网时间：2024/06/07 17:43

以上是一个背景透明的COM容器控件，实现拖拽单个文件，进行循环播放歌曲的效果

FLASH透明窗体就是一种透明容器控件，网络上找不到相关的示例和代码，我这里是通过获取主窗口DC,然后传递给控件，在控件的OnDraw里，实现透明叠加的结果，所以没啥技术含量，但是可以达到实际效果就行了。

主程序关键代码

IUnknown* pUnKnwn=0; pUnKnwn = m_AxWindow.GetControlUnknown();hr= pUnKnwn->QueryInterface(IID_Ixplay,(void **)&m_pIxplay);if (!m_pIxplay){ ::MessageBox(NULL,_T("m_pIxplay==NULL @CMainDlg::OnInitDialog"),_T("Faild"),MB_OK);return true;}if (!m_pMemDC){CPaintDC dc(this); m_pMemDC = new CDC();m_pMemDC->CreateCompatibleDC(&dc);m_memBitmap.DeleteObject();m_memBitmap.CreateCompatibleBitmap(&dc,m_AxRct.Width(), m_AxRct.Height() );//rt.Width(), rt.Height()m_OldBitmap = m_pMemDC->SelectObject(&m_memBitmap);VARIANT varHDC;varHDC.vt = VT_I4 ;///指明数据类型varHDC.lVal = (LONG)m_pMemDC->m_hDC;m_pIxplay->SetAxMemDC(varHDC);}m_pIxplay->LoadFile(_T("J:/mp3/励志歌曲/春天里.mp3"));m_pIxplay->ChangePlayState(0);

控件中OnDraw关键代码

if (m_plyState == Cxplay::PLAYING){::BitBlt(hdc,0,0, nWidth,  nHeight, m_hAxDC,  0, 0, SRCCOPY);CUtil::CreateMaskDC(hdc, 0, 0, nImgWidth, nImgHeight, m_hPauseBg,  nImgWidth, nImgHeight);}else if (m_plyState == Cxplay::PAUSE || m_plyState == Cxplay::STOP){::BitBlt(hdc,0,0, nWidth,  nHeight, m_hAxDC,  0, 0, SRCCOPY);CUtil::CreateMaskDC(hdc, 0, 0, nImgWidth, nImgHeight, m_hPlayBg,  nImgWidth, nImgHeight);}

DEMO下载：xPlayer.rar