怎样显示jpg,gif图片？

[ffll]

1.怎样显示jpg,gif图片？
2.有没有这种控件？

[kimryo]

看能不能借VCL的东东来用用。

[seesi]

我写了一个函数，可以加载任何类型得图象啊。（也不能说任何，反正JPG、Gif、BMP都可以）
void LoadPictureFromFile(HDC hdc, LPCTSTR szFile, CBitmap *pBitmap, CSize &mSize)
{
// open file
HANDLE hFile = CreateFile(szFile, GENERIC_READ, 0, NULL, OPEN_EXISTING, 0, NULL);
_ASSERTE(INVALID_HANDLE_VALUE != hFile);

// get file size
DWORD dwFileSize = GetFileSize(hFile, NULL);
_ASSERTE(-1 != dwFileSize);

LPVOID pvData = NULL;
// alloc memory based on file size
HGLOBAL hGlobal = GlobalAlloc(GMEM_MOVEABLE, dwFileSize);
_ASSERTE(NULL != hGlobal);

pvData = GlobalLock(hGlobal);
_ASSERTE(NULL != pvData);

DWORD dwBytesRead = 0;
// read file and store in global memory
BOOL bRead = ReadFile(hFile, pvData, dwFileSize, &dwBytesRead, NULL);
_ASSERTE(FALSE != bRead);
GlobalUnlock(hGlobal);
CloseHandle(hFile);

LPSTREAM pstm = NULL;
// create IStream* from global memory
HRESULT hr = CreateStreamOnHGlobal(hGlobal, TRUE, &pstm);
_ASSERTE(SUCCEEDED(hr) && pstm);

// Create IPicture from image file
LPPICTURE gpPicture;

hr = ::OleLoadPicture(pstm, dwFileSize, FALSE, IID_IPicture, (LPVOID *)&gpPicture);

_ASSERTE(SUCCEEDED(hr) && gpPicture);
pstm->Release();

OLE_HANDLE m_picHandle;
/*
long hmWidth, hmHeight;
gpPicture->get_Width(&hmWidth);
gpPicture->get_Height(&hmHeight);
int nWidth = MulDiv(hmWidth, GetDeviceCaps(hdc, LOGPIXELSX), HIMETRIC_INCH);
int nHeight = MulDiv(hmHeight, GetDeviceCaps(hdc, LOGPIXELSY), HIMETRIC_INCH);
*/
gpPicture->get_Handle(&m_picHandle);
pBitmap->DeleteObject();
pBitmap->Attach((HGDIOBJ) m_picHandle);

BITMAP bm;
GetObject(pBitmap->m_hObject, sizeof(bm), &bm);
mSize.cx = bm.bmWidth; //nWidth;
mSize.cy = bm.bmHeight; //nHeight;
}
返回CBitmap位图对象和CSize表示大小，然后作为把返回得Bitmap作为普通位图那么操作就行，
只要你会怎么显示位图，就懂得怎么样显示这些图片了。
能行得话，请给我加分啊。

[seesi]

参数说明：hdc为当前设备得句柄
szFile文件名
CBitmap返回得位图
mSize返回得标示图象大小的量

[JeasonZhao]

如果需要有源代码的库，mail我先[e-mail]

[ffll]

谢谢seesi了

[firewwq]

控件就多得是了！
下面是一段很简单的代码，就能实现显示JPG、GIF文件了。我是过了，绝对好用。
是一个CView的例子，别忘了AfxOleInit

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!");
}

[bogerd_2000]

我有源代码,要的话e-mail:[e-mail]

[roaringwind]

http://roaringwind.best.163.com/vcandc/vc1loadgifpicture.htm
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