CImage将图片转为指定像素大小

CFileDialog fDlg(true, "jpg", "",   OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT,   "JPG files (*.jpg)|*.jpg|");

if (fDlg.DoModal () != IDOK) return;

CImage imSrc,imDest;

imSrc.Load( fDlg.GetPathName());

HDC hDC = imSrc.GetDC();

CDC *pDC = CDC::FromHandle(hDC);

CBitmap bmp;

bmp.CreateCompatibleBitmap(pDC,152,200);

CDC memDC;

memDC.CreateCompatibleDC(pDC);

CBitmap *pOld =memDC.SelectObject(&bmp);

::SetStretchBltMode(memDC.m_hDC,HALFTONE);

::SetBrushOrgEx(memDC.m_hDC,0,0,NULL);

imSrc.StretchBlt(memDC.m_hDC,CRect(0,0,152,200)/*DestRect*/,CRect(0,0,imSrc.GetWidth(),imSrc.GetHeight())/*SourceRect*/,SRCCOPY);

//152,200就是你想要的图像的宽和高(以像素为单位)

HBITMAP  hBitmap=(HBITMAP)memDC.SelectObject(pOld->m_hObject);

imDest.Attach(hBitmap);// 载入位图资源

CFileDialog fDlg1(false, "bmp", "",    OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT,    "BMP files (*.bmp)|*.bmp|");

if (fDlg1.DoModal () != IDOK) return;

imDest.Save(fDlg1.GetPathName());

imSrc.ReleaseDC();

imSrc.Destroy();

imDest.Destroy();