Windows 10 Creators update eats metafile graphics in MFC RichTextEdit - mfc

Question

I jumped into an old MFC application which has a problem when run under Windows 10 1703/Creators update. It works fine for XP to Windows 10/1607.
After some investigation, it seems that in Windows 10/1703 the app cannot paste metafiles (wmf and emf) from the clipboard into an CRichTextView and save it. The graphics data is not embedded in the rtf file.
Here is a stripped down example:
static void testFn(CRichEditView* View)
{
// Minimal Example
// Init MetaFileDC
CMetaFileDC MetaFileDC;
CClientDC DC(NULL);
MetaFileDC.CreateEnhanced(NULL, NULL, NULL, NULL);
CRect Recht(0, 0, 400, 300);
MetaFileDC.SetAttribDC(DC.m_hDC);
MetaFileDC.SetWindowOrg(0, 0);
MetaFileDC.SetWindowExt(Recht.Size());
// draw : "ABC" and a line
MetaFileDC.TextOutA(0, 0, "ABC");
MetaFileDC.MoveTo(0, 0);
MetaFileDC.LineTo(Recht.right, Recht.bottom);
// to clipboard
View->OpenClipboard();
EmptyClipboard();
SetClipboardData(CF_ENHMETAFILE, MetaFileDC.CloseEnhanced());
CloseClipboard();
// paste from clipboard
View->GetRichEditCtrl().Paste();
// save rtf file
View->GetDocument()->OnSaveDocument("abc.rtf");
}
This example pastes a enhanced metafile mit "ABC" and a line into the CRichTextView and saves the document as "abc.rtf"
From Windows XP to Windows 10/1607 this works fine
with the latest Creators update the file is smaller and the data is not saved
It is probably related to RichEditBox: picture and content after the picture disappear (Windows 10 1703 Creators Update)
Any ideas? Is there a way to get the metafile graphics in the document without the clipboard?
Bitmaps still work.

Answer 1

We had the same problem in our software after creators update. We also get our graphic via the clipboard.
After some research on Google and SO I came up with this:
HENHMETAFILE hMetafile = nullptr;
if(OpenClipboard(AfxGetMainWnd()->m_hWnd))
{
if(EnumClipboardFormats(0) == CF_ENHMETAFILE)
hMetafile = (HENHMETAFILE) GetClipboardData(CF_ENHMETAFILE);
CloseClipboard();
}
Gdiplus::MetafileHeader header;
Gdiplus::Metafile::GetMetafileHeader(hMetafile,&header);
HDC hdc = AfxGetMainWnd()->GetDC()->GetSafeHdc();
UINT bufsize = GetWinMetaFileBits(hMetafile,0,0,MM_ANISOTROPIC,hdc);
BYTE* buffer = new BYTE[bufsize];
GetWinMetaFileBits(hMetafile,bufsize,buffer,MM_ANISOTROPIC,hdc);
std::stringstream ss;
ss << "{\\rtf1{\\pict\\wmetafile8";
ss << "\\picw" << (UINT)((header.Width / header.DpiX) * 2540) << "\\pich" << (UINT)((header.Height / header.DpiY) * 2540);
ss << "\\picwgoal" << (UINT)((header.Width / header.DpiX) * 1440) << "\\pichgoal" << (UINT)((header.Height / header.DpiY) * 1440);
ss << " " << std::endl;
ss << std::hex << std::setfill('0');
for(UINT i = 0;i < bufsize;++i)
ss << std::setw(2) << static_cast<UINT>(buffer[i]);
delete[] buffer;
ss << "}}" << std::endl;
return ss.str().c_str();
We use this now to insert graphics into our document. I have not tried it as a standalone document.