Insert Images into an RTF control using GDIPlusX
The RichText control that ships with VFP is very useful for providing a formatted text edit box. While this control does support the displaying of images, there is nothing built in to the control that allows you to insert an image. I have included a function below that will allow you insert an image into the RichText control at the current cursor position.
Just specify the object reference to the RTF control and the fullpath of the image you want to insert. The image can be in any format supported by the GDIPlus library (BMP, JPEG, GIF, TIFF, EMF, PNG, etc...). You can also optionally specify the Width and Height you would like the image to be rendered.
This function requires the GDIPlusX library which can be downloaded from the VFPX project site: http://www.codeplex.com/VFPX/Wiki/View.aspx?title=GDIPlusX.
***********************************************************
* Function: InsertRTFImage
*
* Inserts an image into an RTF control at the current cusor position
*
* Parameters:
* toRTF - specifies an object reference to the RTF control
* tcImage - secifies the image to insert into the RTF
* tnWidth - Optional - Specifies the width to use for the image
* tnHeight - Optional - Specifies the height to use for the image
***********************************************************
FUNCTION InsertRTFImage(toRTF, tcImage, tnWidth, tnHeight)
LOCAL lcRTF, lcPict, lqData
LOCAL loImg AS xfcImage
LOCAL loGfx AS xfcGraphics
LOCAL loEMF AS xfcMetaFile
LOCAL lhDC, lhEMF, lnWMFLen
DECLARE Long GetDC IN WIN32API Long
DECLARE Long ReleaseDC IN WIN32API Long, Long
DECLARE Long DeleteEnhMetaFile IN WIN32API Long
DECLARE Long GdipEmfToWmfBits IN GDIPLUS.DLL ;
Long hemf, Long cbData16, String @pData16, ;
Integer iMapMode, Integer eFlags
** Make sure we have initialized the GDIPlusX library
** http://www.codeplex.com/VFPX/Wiki/View.aspx?title=GDIPlusX
IF VARTYPE(_SCREEN.System) <> "O"
ADDPROPERTY(_SCREEN,"System",NEWOBJECT("xfcSystem",LOCFILE("system.vcx")))
ENDIF
lcPict = ""
WITH _SCREEN.System.Drawing
loImg = .Image.FromFile(tcImage)
IF loImg.GetLastStatus() <> 0
ERROR "Could not open file: "+tcImage
ELSE
** If we didn't specify a width, use the image's width and height
IF EMPTY(tnWidth)
tnWidth = loImg.Width
tnHeight = loImg.Height
ENDIF
** Get the default screen HDC as a reference
lhDC = GetDC(0)
** Create a new metafile
loEMF = .Imaging.MetaFile.New(lhDC, ;
.Rectangle.New(0,0,tnWidth,tnHeight), ;
.Imaging.MetafileFrameUnit.Pixel, ;
.Imaging.MetafileType.Emf)
** We are done with the HDC reference, release it
ReleaseDC(lhDC, 0)
** Get a graphics context for the metafile so we can draw to it
loGfx = .Graphics.FromImage(loEMF)
loGFX.SmoothingMode = .Drawing2D.SmoothingMode.HighQuality
loGFX.InterpolationMode = .Drawing2D.InterpolationMode.HighQualityBicubic
** Draw the image
loGfx.DrawImage(loImg, 0, 0, tnWidth, tnHeight)
loGfx = NULL
** Convert the Metafile to a "Windows Metafile".
** This is the best format for the RTF control.
lhEMF = loEMF.GetHenhmetafile()
lnWMFLen = GdipEmfToWmfBits(lhEMF, 0, NULL, 2, 0)
lqData = REPLICATE(0h00,lnWMFLen)
GdipEmfToWmfBits(lhEMF, lnWMFLen, @lqData, 2, 0)
DeleteEnhMetaFile(lhemf)
loImg = NULL
** This is the RTF tags for the image
lcPict = [{\pict\wmetafile8]+;
[\picwgoal]+ALLTRIM(STR(tnWidth*15))+;
[\pichgoal]+ALLTRIM(STR(tnHeight*15))+;
CHR(13)+CHR(10)+;
STRCONV(lqData, 15)+;
CHR(13)+CHR(10)+[}]
ENDIF
ENDWITH
** Stuff the image into the RTF control
toRTF.SelRTF = [{\rtf1\ansi\ansicpg1252\deff0\deflang1033\uc1 ]+lcPict+[}]
RETURN
ENDFUNC
You can also download a sample program using this function here: RTFInsertImage.zip (2.19 KB)
Bo Durban
Keywords: RichText RTF FoxPro VFP GDIPlus GDIPlusX Image
Sunday, June 17, 2007 10:11:49 PM (Eastern Daylight Time, UTC-04:00) 
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