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dotnet drawing api
group:Text in Metafiles
dotnet drawing api:
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> For example, if I had an instance of a Metafile I;d like to serach through > it looking for anu instances of the string "hello" and replace it with > "goodbye" before drawing the metafile onto a Graphics object. Use Graphics.EnumerateMetafile to locate the record, then edit it and play the edited record with Metafile.PlayRecord. See MSDN for sample code: http://msdn2.microsoft.com/en-us/library/system.drawing.imaging.metafile.playrecord.aspx [quoted text, click to view] "elziko" <elziko@yahoo.co.uk> wrote in message news:uTgA0vJoIHA.4928@TK2MSFTNGP04.phx.gbl... > Is there any way I can execute some sort of search and replace on the text > inside a metafile in code? > > For example, if I had an instance of a Metafile I;d like to serach through > it looking for anu instances of the string "hello" and replace it with > "goodbye" before drawing the metafile onto a Graphics object. > > It must leave all the other graphics in file file untouched including font > sizes etc. > > Any ideas, help or pointers? > > TIA >
Is there any way I can execute some sort of search and replace on the text
inside a metafile in code? For example, if I had an instance of a Metafile I;d like to serach through it looking for anu instances of the string "hello" and replace it with "goodbye" before drawing the metafile onto a Graphics object. It must leave all the other graphics in file file untouched including font sizes etc. Any ideas, help or pointers? TIA
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> Do you have any ideas on why this may be happening? Not without reviewing code that reproduces the problem. My advice is to try recording an Emf format Enhanced Metafile rather than a gdiplus EmfPlus or EmfPlusDual, etc. Additionally, try examining known samples of Enhanced Metafiles by enumerating the records for text. You may be missing some needed records for setting up the records for playback to your chosen device. MSDN is loaded with samples and code for non gdiplus Enhanced Metafiles.
Thanks for getting me started!
Originally I was just drawing my metafile straight onto my graphics object: TheGraphics.DrawImage(TheMetaFile, 0,0) Now I understand that I could replace the DrawImage method with a call to EnumerateMetafile which uses the delegate mentioned in your link. So initially, before trying to change any text I am just trying to get my metafile to draw correctly without using the DrawImage method. Using the code in your link I can get my metafile to be drawn. However, the metafile contains one simple line and one simple string. When the PlayRecord method gets called for each of these elements they are 'played' at vastly different scales! The text appears roughly the correct size where as the line is drawn at least one order of magnitude too large! Do you have any ideas on why this may be happening? TIA [quoted text, click to view] "Michael Phillips, Jr." <mphillips53@nospam.jun0.c0m> wrote in message news:%23cFuisKoIHA.4328@TK2MSFTNGP03.phx.gbl... >> For example, if I had an instance of a Metafile I;d like to serach >> through it looking for anu instances of the string "hello" and replace it >> with "goodbye" before drawing the metafile onto a Graphics object. > > Use Graphics.EnumerateMetafile to locate the record, then edit it and play > the edited record with Metafile.PlayRecord. > > See MSDN for sample code: > http://msdn2.microsoft.com/en-us/library/system.drawing.imaging.metafile.playrecord.aspx > > > > "elziko" <elziko@yahoo.co.uk> wrote in message > news:uTgA0vJoIHA.4928@TK2MSFTNGP04.phx.gbl... >> Is there any way I can execute some sort of search and replace on the >> text inside a metafile in code? >> >> For example, if I had an instance of a Metafile I;d like to serach >> through it looking for anu instances of the string "hello" and replace it >> with "goodbye" before drawing the metafile onto a Graphics object. >> >> It must leave all the other graphics in file file untouched including >> font sizes etc. >> >> Any ideas, help or pointers? >> >> TIA >> > >
You should document this on Microsoft's Connect site.
After, you document it you can post a link here for us to vote. Microsoft will only correct bugs and documentation errors when they are notified and enough developers vote for the changes. [quoted text, click to view] "elziko" <elziko@yahoo.co.uk> wrote in message news:u91d4Q7oIHA.4904@TK2MSFTNGP03.phx.gbl... > "Michael Phillips, Jr." <mphillips53@nospam.jun0.c0m> wrote in message > news:OJDyBrWoIHA.4928@TK2MSFTNGP04.phx.gbl... >> You may be missing some needed records for setting up the records for >> playback to your chosen device. > > I have been looking closely at the records in the files I am trying to > display. It seems to me that the code on the MSDN link you gave me has a > bug in it. As each record is enumerated the code elects not to play that > record if data <> IntPtr.Zero i.e. there is no data associated with that > record. The problem with this is that there seems to be records that > contain no data but are still required. In my case the MSDN code was not > playing the following records: > > SetTextRenderingHint > SetAntiAliasMode > SetTextRenderingHint > SetAntiAliasMode > ResetWorldTransform > EndOfFile > > So I changed the callback function on MSDN code to read: > > Private Function MetafileCallback(ByVal recordType As EmfPlusRecordType, > ByVal flags As Integer, ByVal dataSize As Integer, ByVal data As IntPtr, > ByVal callbackData As PlayRecordCallback) As Boolean > Dim dataArray As Byte() = Nothing > If data <> IntPtr.Zero Then > ' Copy the unmanaged record to a managed byte buffer > ' that can be used by PlayRecord. > dataArray = New Byte(dataSize) {} > Marshal.Copy(data, dataArray, 0, dataSize) > End If > meta.PlayRecord(recordType, flags, dataSize, dataArray) 'note that > every record gets played even if the dataArray is empty > Return True > End Function > > ...and it now works fine - the only thing I find strange is that I have > seen the code in examples all over the internet and in one of our books > here and no-one else seems to have noticed the problem, or at least not > mentioned it. > > Anyway, if anyone else comes up with the same problem I hope this post > helps. >
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"Michael Phillips, Jr." <mphillips53@nospam.jun0.c0m> wrote in message news:OJDyBrWoIHA.4928@TK2MSFTNGP04.phx.gbl... > You may be missing some needed records for setting up the records for > playback to your chosen device. I have been looking closely at the records in the files I am trying to display. It seems to me that the code on the MSDN link you gave me has a bug in it. As each record is enumerated the code elects not to play that record if data <> IntPtr.Zero i.e. there is no data associated with that record. The problem with this is that there seems to be records that contain no data but are still required. In my case the MSDN code was not playing the following records: SetTextRenderingHint SetAntiAliasMode SetTextRenderingHint SetAntiAliasMode ResetWorldTransform EndOfFile So I changed the callback function on MSDN code to read: Private Function MetafileCallback(ByVal recordType As EmfPlusRecordType, ByVal flags As Integer, ByVal dataSize As Integer, ByVal data As IntPtr, ByVal callbackData As PlayRecordCallback) As Boolean Dim dataArray As Byte() = Nothing If data <> IntPtr.Zero Then ' Copy the unmanaged record to a managed byte buffer ' that can be used by PlayRecord. dataArray = New Byte(dataSize) {} Marshal.Copy(data, dataArray, 0, dataSize) End If meta.PlayRecord(recordType, flags, dataSize, dataArray) 'note that every record gets played even if the dataArray is empty Return True End Function ....and it now works fine - the only thing I find strange is that I have seen the code in examples all over the internet and in one of our books here and no-one else seems to have noticed the problem, or at least not mentioned it. Anyway, if anyone else comes up with the same problem I hope this post helps.
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