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added wxImage::CanRead

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@3421 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Václav Slavík
1999-08-18 21:22:54 +00:00
parent cae5359f18
commit 0828c0875e
8 changed files with 84 additions and 15 deletions
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40
src/common/image.cpp
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@@ -436,23 +436,14 @@ bool wxImage::LoadFile( wxInputStream& stream, long type )
if (type==wxBITMAP_TYPE_ANY)
{
// here we can try to guess the handler according the extension,
// but we lose the stream name !?
// Probably we should write methods such as
// bool wxImageHandler::CanRead(wxString&)
// bool wxImageHandler::CanRead(sxInputStream&&)
// for png : see example.c
wxList &list=GetHandlers();
off_t pos=stream.TellI();
wxLogNull prevent_log;
for ( wxList::Node *node = list.GetFirst(); node; node = node->GetNext() )
{
handler=(wxImageHandler*)node->GetData();
if (handler->LoadFile( this, stream, FALSE )) return TRUE;
if (handler->CanRead( stream ))
return handler->LoadFile( this, stream );
stream.SeekI(pos);
}
wxLogWarning( _T("No handler found for this image.") );
@@ -637,6 +628,33 @@ bool wxImageHandler::SaveFile( wxImage *WXUNUSED(image), wxOutputStream& WXUNUSE
{
return FALSE;
}
bool wxImageHandler::CanRead( wxInputStream& stream )
{
return FALSE;
}
bool wxImageHandler::CanRead( const wxString& name )
{
#if wxUSE_STREAMS
if (wxFileExists(name))
{
wxFileInputStream stream(name);
return CanRead(stream);
}
else {
wxLogError( _T("Can't check image format of file '%s': file does not exist."), name.c_str() );
return FALSE;
}
#else // !wxUSE_STREAMS
return FALSE;
#endif // wxUSE_STREAMS
}
#endif // wxUSE_STREAMS
//-----------------------------------------------------------------------------