I need help with rendering CRichEditCtrl content with transparent background on graphical context which is displayed on screen and printed as well. Now I have following code, which is working good except transparency issues:
CRichEditCtrl ctrl; // my CRichEditCtrl
CDC *dc; // - my graphical context
dc->SetBkMode(TRANSPARENT);
dc->DPtoHIMETRIC(&targetSize);
CRect cHiMetricRect( 0, 0, origSize.cx*factor,origSize.cy*factor);
CRect cTwipsRect( 0, 0, (TWIPS_INCH * targetSize.cx + HIMETRIC_INCH / 2) / HIMETRIC_INCH, (TWIPS_INCH * targetSize.cy + HIMETRIC_INCH / 2) / HIMETRIC_INCH);
CMetaFileDC metaFile;
metaFile.CreateEnhanced( dc, NULL, cHiMetricRect, NULL );
metaFile.SetBkMode(TRANSPARENT);
metaFile.SetAttribDC( dc->m_hDC );
FORMATRANGE stFR;
stFR.hdcTarget = stFR.hdc = metaFile.m_hDC;
stFR.rcPage = stFR.rc = cTwipsRect;
stFR.chrg.cpMin = 0;
stFR.chrg.cpMax = -1;
ctrl.FormatRange( &stFR, TRUE);
ctrl.FormatRange( NULL, TRUE);
HENHMETAFILE hMetaFile = metaFile.CloseEnhanced();
dc->PlayMetaFile(hMetaFile,&cr);
DeleteEnhMetaFile(hMetaFile);
I need to render this text with transparency because there are already things drawn on my DC. I tried to search web for any help about metafiles and transparency but found nothing adequate. I will be thankful for any kind of help.
I'm not very sure about MetaFiles, but I've done something similar with EMFs with straight WinAPI which does work -- call
EnumEnhMetaFile
instead ofPlayMetaFile
, like:where the EnumProc is defined as