ATL控件Picture属性赋值方法

//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;

}