巨难问题:有谁知道将一个文件读到内存中直接运用它

[guzy]

比如像WINZIP那样还没解压缩到磁盘就可直接查看它

[Tasehouny]

哈哈！没有文件在内存外运行的。你想做到什么效果？

[kenny_yuan]

这两个没有可比性！
可以试试FileMapping

[kenny_yuan]

to zeclmj
要实现的目标不同，
手段当然也不同！
`

[Squarrel]

use CMemFile or use FileMapping()

[nustchen]

CreateFileMapping和MapViewOfFile

[zeclmj]

如果这样能行的话，做病毒就很简单了，何必要 jmp XXX。
用VC几条指令就可以轻松实现。

[hx]

你要做什么。

[蒋晟]

void CDrawView::OnEditCopy()
{
ASSERT_VALID(this);
ASSERT(m_cfDraw != NULL);

// Create a shared file and associate a CArchive with it
CSharedFile file;
CArchive ar(&file, CArchive::store);

// Serialize selected objects to the archive
m_selection.Serialize(ar);
ar.Close();

COleDataSource* pDataSource = NULL;
TRY
{
pDataSource = new COleDataSource;
// put on local format instead of or in addation to
pDataSource->CacheGlobalData(m_cfDraw, file.Detach());

// if only one item and it is a COleClientItem then also
// paste in that format
CDrawObj* pDrawObj = m_selection.GetHead();
if (m_selection.GetCount() == 1 &&
pDrawObj->IsKindOf(RUNTIME_CLASS(CDrawOleObj)))
{
CDrawOleObj* pDrawOle = (CDrawOleObj*)pDrawObj;
pDrawOle->m_pClientItem->GetClipboardData(pDataSource, FALSE);
}
pDataSource->SetClipboard();
}
CATCH_ALL(e)
{
delete pDataSource;
THROW_LAST();
}
END_CATCH_ALL
}

void CDrawView::OnEditPaste()
{
COleDataObject dataObject;
dataObject.AttachClipboard();

// invalidate current selection since it will be deselected
OnUpdate(NULL, HINT_UPDATE_SELECTION, NULL);
m_selection.RemoveAll();
if (dataObject.IsDataAvailable(m_cfDraw))
{
PasteNative(dataObject);

// now add all items in m_selection to document
POSITION pos = m_selection.GetHeadPosition();
while (pos != NULL)
GetDocument()->Add(m_selection.GetNext(pos));
}
else
PasteEmbedded(dataObject, GetInitialPosition().TopLeft() );

GetDocument()->SetModifiedFlag();

// invalidate new pasted stuff
GetDocument()->UpdateAllViews(NULL, HINT_UPDATE_SELECTION, &m_selection);
}

[dfwolf]

文件映像比较好

[蒋晟]

void CDrawView::PasteNative(COleDataObject& dataObject)
{
// get file refering to clipboard data
CFile* pFile = dataObject.GetFileData(m_cfDraw);
if (pFile == NULL)
return;

// connect the file to the archive
CArchive ar(pFile, CArchive::load);
TRY
{
ar.m_pDocument = GetDocument(); // set back-pointer in archive

// read the selection
m_selection.Serialize(ar);
}
CATCH_ALL(e)
{
ar.Close();
delete pFile;
THROW_LAST();
}
END_CATCH_ALL

ar.Close();
delete pFile;
}