//接口函数
STDMETHODIMP CObj::init()
{
// TODO: Add your implementation code here
initPic(m_pPicture,"F:\\obj.bmp");
return S_OK;
}
//初始化m_pPicture的函数
void CObj::initPic(CComPtr<IPictureDisp> &pPicture,LPCTSTR path)
{
using namespace std;
long cb;
fstream file(path, ios_base::in);
file.seekg(0, ios::end);
cb = file.tellg();
CComPtr<IStream> pStm;
HGLOBAL hGlob = GlobalAlloc(GHND, cb);
LPVOID pvData = NULL;
if (hGlob )
{
if ((pvData = GlobalLock(hGlob )) != NULL)
{
file.seekg(0,ios::beg);
file.read((char*)pvData,cb);
GlobalUnlock(hGlob );
CreateStreamOnHGlobal(hGlob , TRUE, &pStm);
}
}
m_pPicture = NULL;
OleLoadPicture(pStm,cb,FALSE,IID_IPictureDisp,(LPVOID*)&m_pPicture);
pStm.Release();
GlobalFree(hGlob );
file.close();
this->m_bRequiresSave = TRUE;
this->FireOnChanged(DISPID_PICTURE);
this->FireViewChange();
}
//绘制图片的函数
void CObj::drawPic(ATL_DRAWINFO& di)
{
RECT& rc = *(RECT*)di.prcBounds;
LPPICTURE pPict ;
DWORD dwAttr ;
OLE_XSIZE_HIMETRIC cxSrc;
OLE_YSIZE_HIMETRIC cySrc;
if ((m_pPicture != NULL) &&SUCCEEDED(m_pPicture->QueryInterface(IID_IPicture, (LPVOID*)&pPict)))
{
pPict->get_Attributes(&dwAttr);
if(dwAttr==S_OK)
{
pPict->get_Width(&cxSrc);
pPict->get_Height(&cySrc);
pPict->Render(di.hdcDraw,rc.left, rc.top, rc.right, rc.bottom,0,0,cxSrc,cySrc,&rc);
}
}
}
//
HRESULT OnDraw(ATL_DRAWINFO& di)
{
RECT& rc = *(RECT*)di.prcBounds;
Rectangle(di.hdcDraw, rc.left, rc.top, rc.right, rc.bottom);
SetTextAlign(di.hdcDraw, TA_CENTER|TA_BASELINE);
LPCTSTR pszText = _T("ATL 3.0 : Obj");
TextOut(di.hdcDraw,
(rc.left + rc.right) / 2,
(rc.top + rc.bottom) / 2,
pszText,
lstrlen(pszText));
drawPic(di); //通过这句绘制
return S_OK;
}
