mostrar imagenes jpg

La mejor manera que tiene de hacer eso, es usar el nuevo API GDI+, facilita
mucho la vida para trabajar con formatos graficos distintos de bmp. Tienes
muchas información en la MSDN. Necesitaras descargar un SDK actualizado, si
estas usando VC++ 6.0.

Un saludo.
Rodrigo Corral González

Gracias, va muy bien es lo que buscaba



Un cordial saludo.
____________________________________________________________________________
Juan José Gómez Barroso

Ingeniero de Sistemas. Cherrytel Comunicaciones S.L.



"Sergio" escribió en el mensaje
news:

Usa la siguiente clase, me la pasaron en este foro y funciona muy bien.

////////////////////////////////////////////////////////////////
// MSDN Magazine -- October 2001
// If this code works, it was written by Paul DiLascia.
// If not, I don't know who wrote it.
// Compiles with Visual C++ 6.0 for Windows 98 and probably Windows 2000
too.
// Set tabsize = 3 in your editor.
//
#pragma once
#include <atlbase.h>
#include <afxpriv2.h>

//////////////////
// Picture object--encapsulates IPicture
//
class CPicture
{
public:
CPicture();
~CPicture();

// Load frm various sosurces
BOOL Load(UINT nIDRes);
BOOL Load(LPCTSTR pszPathName);
BOOL Load(CFile& file);
BOOL Load(CArchive& ar);
BOOL Load(IStream* pstm);

// render to device context
BOOL Render(CDC* pDC, CRect rc=CRect(0,0,0,0), LPCRECT prcMFBounds=NULL)
const;

CSize GetImageSize(CDC* pDC=NULL) const;

operator IPicture*() { return m_spIPicture;}

void GetHIMETRICSize(OLE_XSIZE_HIMETRIC& cx, OLE_YSIZE_HIMETRIC& cy)

const

{
cx = cy = 0;
const_cast<CPicture*>(this)->m_hr = m_spIPicture->get_Width(&cx);
ASSERT(SUCCEEDED(m_hr));
const_cast<CPicture*>(this)->m_hr = m_spIPicture->get_Height(&cy);
ASSERT(SUCCEEDED(m_hr));
}

void Free()
{
if (m_spIPicture)
{
m_spIPicture.Release();
}
}

protected:
CComQIPtr<IPicture>m_spIPicture; // ATL smart pointer to IPicture
HRESULT m_hr; // last error code
};


////////////////////////////////////////////////////////////////
// MSDN Magazine -- October 2001
// If this code works, it was written by Paul DiLascia.
// If not, I don't know who wrote it.
// Compiles with Visual C++ 6.0 for Windows 98 and probably Windows 2000
too.
// Set tabsize = 3 in your editor.
//
#include "StdAfx.h"
#include "Picture.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

////////////////////////////////////////////////////////////////
// CPicture implementation
//

CPicture::CPicture()
{
}

CPicture::~CPicture()
{
}

//////////////////
// Load from resource. Looks for "IMAGE" type.
//
BOOL CPicture::Load(UINT nIDRes)
{
// find resource in resource file
HINSTANCE hInst = AfxGetResourceHandle();
HRSRC hRsrc = ::FindResource(hInst,
MAKEINTRESOURCE(nIDRes),
"IMAGE"); // type
if (!hRsrc)
return FALSE;

// load resource into memory
DWORD len = SizeofResource(hInst, hRsrc);
BYTE* lpRsrc = (BYTE*)LoadResource(hInst, hRsrc);
if (!lpRsrc)
return FALSE;

// create memory file and load it
CMemFile file(lpRsrc, len);
BOOL bRet = Load(file);
FreeResource(hRsrc);

return bRet;
}

//////////////////
// Load from path name.
//
BOOL CPicture::Load(LPCTSTR pszPathName)
{
CFile file;
if (!file.Open(pszPathName, CFile::modeRead|CFile::shareDenyWrite))
return FALSE;
BOOL bRet = Load(file);
file.Close();
return bRet;
}

//////////////////
// Load from CFile
//
BOOL CPicture::Load(CFile& file)
{
CArchive ar(&file, CArchive::load | CArchive::bNoFlushOnDelete);
return Load(ar);
}

//////////////////
// Load from archive--create stream and load from stream.
//
BOOL CPicture::Load(CArchive& ar)
{
CArchiveStream arcstream(&ar);
return Load((IStream*)&arcstream);
}

//////////////////
// Load from stream (IStream). This is the one that really does it: call
// OleLoadPicture to do the work.
//
BOOL CPicture::Load(IStream* pstm)
{
Free();
HRESULT hr = OleLoadPicture(pstm, 0, FALSE, IID_IPicture,
(void**)&m_spIPicture);
ASSERT(SUCCEEDED(hr) && m_spIPicture);
return TRUE;
}

//////////////////
// Render to device context. Covert to HIMETRIC for IPicture.
//
BOOL CPicture::Render(CDC* pDC, CRect rc, LPCRECT prcMFBounds) const
{
ASSERT(pDC);

if (rc.IsRectNull())
{
CSize sz = GetImageSize(pDC);
rc.right = sz.cx;
rc.bottom = sz.cy;
}
long hmWidth,hmHeight; // HIMETRIC units
GetHIMETRICSize(hmWidth, hmHeight);
m_spIPicture->Render(*pDC, rc.left, rc.top, rc.Width(), rc.Height(),
0, hmHeight, hmWidth, -hmHeight, prcMFBounds);

return TRUE;
}

//////////////////
// Get image size in pixels. Converts from HIMETRIC to device coords.
//
CSize CPicture::GetImageSize(CDC* pDC) const
{
if (!m_spIPicture)
return CSize(0,0);

LONG hmWidth, hmHeight; // HIMETRIC units
m_spIPicture->get_Width (&hmWidth);
m_spIPicture->get_Height(&hmHeight);
CSize sz(hmWidth,hmHeight);
if (pDC==NULL)
{
CWindowDC dc(NULL);
dc.HIMETRICtoDP(&sz); // convert to pixels
}
else
{
pDC->HIMETRICtoDP(&sz);
}
return sz;
}

La forma de usarla es la siguente:
Te montas un frame en el formulario y le pasas a la funcion load el path

de

la imagen, y a la funcion render el DC del frame, un CRect con los datos

del

frame y fuera. Funciona con gifs y jpegs