显示GIF和JPG图片

[UPCCPU]

怎么显示显示GIF和JPG图片？

[ciml]

我个人觉得用Picture接口比较好！
或者用GDI+

[UPCCPU]

具体怎么用呢？
能举个例子吗？

[shilong]

VC调用JPEG ,此方法也适用于gif.


void CPICView::OnDraw(CDC* pDC)
{
CPICDoc* pDoc = GetDocument();
ASSERT_VALID(pDoc);

IPicture *pPic;
IStream *pStm;

CFileStatus fstatus;
CFile file;
LONG cb;

if (file.Open("c:/test.jpg",CFile::modeRead)&&file.GetStatus("c:/test.jpg",
fstatus)&&
((cb = fstatus.m_size) != -1))
{
HGLOBAL hGlobal = GlobalAlloc(GMEM_MOVEABLE, cb);
LPVOID pvData = NULL;
if (hGlobal != NULL)
{
if ((pvData = GlobalLock(hGlobal)) != NULL)
{
file.ReadHuge(pvData, cb);
GlobalUnlock(hGlobal);
CreateStreamOnHGlobal(hGlobal, TRUE, &pStm);

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;
fX = (double)pDC->GetDeviceCaps(HORZRES)*(double)hmWidth/((double)pDC->Ge
tDeviceCaps(HORZSIZE)*100.0);
fY = (double)pDC->GetDeviceCaps(VERTRES)*(double)hmHeight/((double)pDC->G
etDeviceCaps(VERTSIZE)*100.0);
if(FAILED(pPic->Render(*pDC,0,0,(DWORD)fX,(DWORD)fY,0,hmHeight,hmWidth,-h
mHeight,NULL)))
AfxMessageBox("Failed To Render The picture!");
pPic->Release();
}
else
AfxMessageBox("Error Loading Picture From Stream!");
}
}
}
else
AfxMessageBox("Can"t Open Image File!");
}

[free_card]

BOOL CViewWindow::ShowBmp(CDC* pDC,CString strPath)
{
CBitmap mBitmap; //定义一个位图类
CDC MemDC;
BITMAP bm;

CRect Rect;
int x=0, y=0;
HBITMAP hImage = (HBITMAP)LoadImage(NULL, strPath, IMAGE_BITMAP,
0, 0, LR_LOADFROMFILE|LR_CREATEDIBSECTION|LR_DEFAULTSIZE);

mBitmap.Attach(hImage); //装入位图对象

GetClientRect (&Rect); //获取客户区大小

mBitmap.GetObject (sizeof (BITMAP),&bm); //用位图上的信息 填充BITMAP结构的各个域
MemDC.CreateCompatibleDC (pDC); //初始化内存描述对象
CBitmap*pOldBitmap=MemDC.SelectObject (&mBitmap); //定 义一个CBITMAP类，并初始化为选入到设备描述对象的位图

//x= (Rect.Width()-bm.bmWidth) /2; //位图左上角横坐标

//y= (Rect.Height()-bm.bmHeight) /2; //位图左上角纵坐标

/*pDC->BitBlt

(x, //目标位图横坐标

y, //目标位图纵坐标

bm.bmWidth, //要转换的块高度

bm.bmHeight, //要转换的块宽度

&MemDC, //图形数据的源设备对象

0, //源位图横坐标

0, //源位图纵坐标

SRCCOPY); //转换类型代码，SRCCOPY 表示数据不经修改直接拷贝


return TRUE;*/
//平铺图形
fX = bm.bmWidth;
fY = bm.bmHeight;
pDC->BitBlt (0, 0, bm.bmWidth, bm.bmHeight, &MemDC, 0, 0, SRCCOPY );


MemDC.SelectObject ( pOldBitmap ); //将位图对象选入 内存 设备描述对象


return TRUE;
}

BOOL CViewWindow::ShowJpgGif(CDC* pDC,CString strPath, int x, int y)

{

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);
GlobalUnlock(hGlobal);
CreateStreamOnHGlobal(hGlobal, TRUE, &pStm);
}
}
}
else
{
return false;

} //打开文件结束



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);

//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);

//set view window size----------//

/* if (fX>fY)
{
fY = fY/fX*150;
fX = 150;
}
else
{
fX = fX/fY*150;
fY = 150;
}
*/
//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;
}
}
else
{
return false;
}
return true;
}