如何在MFC窗口显示BMP和JPG图片

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//通过资源画图
static void DrawBitmap(UINT bitmap,CDC *pDC,CRect rect)
{
CBitmap bmp;
if (bmp.LoadBitmap(bitmap))
{
BITMAP bmpInfo;
bmp.GetBitmap(&bmpInfo);
CDC dcMemory;
dcMemory.CreateCompatibleDC(pDC);
dcMemory.SelectObject(&bmp);
pDC->SetStretchBltMode(HALFTONE);
pDC->StretchBlt(rect.left,rect.top,rect.Width(),rect.Height(),&dcMemory,0,0,bmpInfo.bmWidth,bmpInfo.bmHeight,SRCCOPY);
}
}

//通过BMP文件画图
static void drawBitmapFormFile(CString BitmapFilePath,CDC *pDC,CRect rect)
{
HANDLE filehandle=::LoadImage(NULL,BitmapFilePath,IMAGE_BITMAP,0,0,LR_LOADFROMFILE);
if(filehandle!=NULL)
{
CBitmap bmp;
if(bmp.Attach(filehandle))
{
BITMAP bmpInfo;
bmp.GetBitmap(&bmpInfo);
CDC dcMemory;
dcMemory.CreateCompatibleDC(pDC);
dcMemory.SelectObject(&bmp);
pDC->SetStretchBltMode(HALFTONE);
pDC->StretchBlt(rect.left,rect.top,rect.Width(),rect.Height(),&dcMemory,0,0,bmpInfo.bmWidth,bmpInfo.bmHeight,SRCCOPY);
bmp.Detach();
}
}
}

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BOOL CShowBitmapView::ShowJpgGif(CDC* pDC,CString strPath, int x, int y)//读取文件信息方式打开JPG等图片文件
{
IStream *pStm;
CFileStatus fstatus;
CFile file;
LONG cb;
//打开文件并检测文件的有效性
if (file.Open(strPath,CFile::modeRead)&&
file.GetStatus(strPath,fstatus)&&
((cb = fstatus.m_size) != -1))
{
HGLOBAL hGlobal = GlobalAlloc(GMEM_MOVEABLE, cb);
LPVOID pvData = NULL;
if (hGlobal != NULL)
{
pvData = GlobalLock(hGlobal);
if (pvData != NULL)
{
//file.ReadHuge(pvData, cb); //6.0中可能是用这个函数
file.Read(pvData, cb); //VC2005.NET中用这个函数
GlobalUnlock(hGlobal);
CreateStreamOnHGlobal(hGlobal, TRUE, &pStm);
}
}
}
else
{
return false;
} //打开文件结束
//显示JPEG和GIF格式的图片，GIF只能显示一帧，还不能显示动画，
//要显示动画GIF请使用ACTIVE控件。
IPicture *pPic;
//load image from file stream
if(SUCCEEDED(OleLoadPicture(pStm,fstatus.m_size,TRUE,IID_IPicture,(LPVOID*)&pPic)))
{
OLE_XSIZE_HIMETRIC hmWidth;
OLE_YSIZE_HIMETRIC hmHeight;
pPic->get_Width(&hmWidth);
pPic->get_Height(&hmHeight);
double fX,fY;
//get image height and width
fX = (double)pDC->GetDeviceCaps(HORZRES)*(double)hmWidth/((double)pDC->GetDeviceCaps(HORZSIZE)*100.0);
fY = (double)pDC->GetDeviceCaps(VERTRES)*(double)hmHeight/((double)pDC->GetDeviceCaps(VERTSIZE)*100.0);
//use render function display image
if(FAILED(pPic->Render(*pDC,x,y,(DWORD)fX,(DWORD)fY,0,hmHeight,hmWidth,-hmHeight,NULL)))
{
pPic->Release();
return false;
}
pPic->Release();
}
else
{
return false;
}
return true;
}