Windows RichTextBox Problem

Question

Windows RichTextBox Problem

viral patel 1

Hi,

I am using windows RichText box to create RTF file for RTF input.
below is code,

RichTextBox RtfContent= new RichTextBox();
RtfContent.LoadFile(FileName,RichTextBoxStreamType.RichText);
in last getting RtfContent.RTF to write in file.

For some RTF inputs, it throws "External Component has thrown an error" in the RTFLoadFile method.

Is there any solution to resolve this issue ?

Note:

Loading with PlainText type working fine.
Same line of codes not giving any error in .NetFramework 4.6 but in .Net Framework 4.7 it throws error.

**

See below input RTF Content Causing issue,

**

{\rtf1\ansi\ansicpg1252\uc1\deff0\stshfdbch0\stshfloch0\stshfhich0\stshfbi0\deflang1033\deflangfe1033{\fonttbl{\f0\froman\fcharset0\fprq2{*\panose 02020603050405020304}Times New Roman{*\falt Times New Roman};}{\f1\fswiss\fcharset0\fprq2{*\panose 020b0604020202020204}Arial{*\falt Helvetica};}{\f35\fswiss\fcharset0\fprq2{*\panose 020b0604030504040204}Tahoma;}{\f39\froman\fcharset238\fprq2 Times New Roman CE{*\falt Times New Roman};}{\f40\froman\fcharset204\fprq2 Times New Roman Cyr{*\falt Times New Roman};}{\f42\froman\fcharset161\fprq2 Times New Roman Greek{*\falt Times New Roman};}{\f43\froman\fcharset162\fprq2 Times New Roman Tur{*\falt Times New Roman};}{\f44\froman\fcharset177\fprq2 Times New Roman (Hebrew){*\falt Times New Roman};}{\f45\froman\fcharset178\fprq2 Times New Roman (Arabic){*\falt Times New Roman};}{\f46\froman\fcharset186\fprq2 Times New Roman Baltic{*\falt Times New Roman};}{\f47\froman\fcharset163\fprq2 Times New Roman (Vietnamese){*\falt Times New Roman};}{\f49\fswiss\fcharset238\fprq2 Arial CE{*\falt Helvetica};}{\f50\fswiss\fcharset204\fprq2 Arial Cyr{*\falt Helvetica};}{\f52\fswiss\fcharset161\fprq2 Arial Greek{*\falt Helvetica};}{\f53\fswiss\fcharset162\fprq2 Arial Tur{*\falt Helvetica};}{\f54\fswiss\fcharset177\fprq2 Arial (Hebrew){*\falt Helvetica};}{\f55\fswiss\fcharset178\fprq2 Arial (Arabic){*\falt Helvetica};}{\f56\fswiss\fcharset186\fprq2 Arial Baltic{*\falt Helvetica};}{\f57\fswiss\fcharset163\fprq2 Arial (Vietnamese){*\falt Helvetica};}{\f389\fswiss\fcharset238\fprq2 Tahoma CE;}{\f390\fswiss\fcharset204\fprq2 Tahoma Cyr;}{\f392\fswiss\fcharset161\fprq2 Tahoma Greek;}{\f393\fswiss\fcharset162\fprq2 Tahoma Tur;}{\f394\fswiss\fcharset177\fprq2 Tahoma (Hebrew);}{\f395\fswiss\fcharset178\fprq2 Tahoma (Arabic);}{\f396\fswiss\fcharset186\fprq2 Tahoma Baltic;}{\f397\fswiss\fcharset163\fprq2 Tahoma (Vietnamese);}{\f398\fswiss\fcharset222\fprq2 Tahoma (Thai);}}{\colortbl;\red0\green0\blue0;\red0\green0\blue255;\red0\green255\blue255;\red0\green255\blue0;\red255\green0\blue255;\red255\green0\blue0;\red255\green255\blue0;\red255\green255\blue255;\red0\green0\blue128;\red0\green128\blue128;\red0\green128\blue0;\red128\green0\blue128;\red128\green0\blue0;\red128\green128\blue0;\red128\green128\blue128;\red192\green192\blue192;\red0\green102\blue102;}{\stylesheet{\ql \li0\ri0\widctlpar\wrapdefault\aspalpha\aspnum\faauto\adjustright\rin0\lin0\itap0 \fs24\lang1033\langfe1033\cgrid\langnp1033\langfenp1033 \snext0 \styrsid9127038 Normal;}{*\cs10 \additive \ssemihidden Default Paragraph Font;}{*\ts11\tsrowd\trftsWidthB3\trpaddl108\trpaddr108\trpaddfl3\trpaddft3\trpaddfb3\trpaddfr3\tblind0\tblindtype3\tscellwidthfts0\tsvertalt\tsbrdrt\tsbrdrl\tsbrdrb\tsbrdrr\tsbrdrdgl\tsbrdrdgr\tsbrdrh\tsbrdrv \ql \li0\ri0\widctlpar\wrapdefault\aspalpha\aspnum\faauto\adjustright\rin0\lin0\itap0 \fs20\lang1024\langfe1024\cgrid\langnp1024\langfenp1024 \snext11 \ssemihidden Normal Table;}{*\cs15 \additive \ul\cf2 \sbasedon10 \styrsid9127038 Hyperlink;}{*\cs16 \additive \ul\cf12 \sbasedon10 \styrsid9127038 FollowedHyperlink;}{*\cs17 \additive \f35\fs22\expnd0\expndtw0\cf9 \sbasedon10 \ssemihidden \spersonal \scompose \styrsid9127038 EmailStyle17;}{\s18\ql \li0\ri0\sb100\sa100\sbauto1\saauto1\widctlpar\wrapdefault\aspalpha\aspnum\faauto\adjustright\rin0\lin0\itap0 \fs24\lang1033\langfe1033\cgrid\langnp1033\langfenp1033 \sbasedon0 \snext18 \styrsid9127038 Normal (Web);}{\s19\ql \li0\ri0\widctlpar\wrapdefault\aspalpha\aspnum\faauto\adjustright\rin0\lin0\itap0 \fs24\lang1033\langfe1033\cgrid\langnp1033\langfenp1033 \sbasedon0 \snext19 \styrsid9127038 E-mail Signature;}}{*\revtbl {Unknown;}}{*\pgptbl {\pgp\ipgp2\itap0\li0\ri0\sb0\sa0}{\pgp\ipgp0\itap0\li750\ri0\sb300\sa0}}{*\rsidtbl \rsid1267987\rsid4288638\rsid9127038\rsid14224636}{*\xmlnstbl {\xmlns1 urn:schemas-microsoft-com:office:smarttags}}\paperw12240\paperh15840\margl1800\margr1800\margt1440\margb1440\gutter0 \widowctrl\ftnbj\aenddoc\noxlattoyen\expshrtn\noultrlspc\dntblnsbdb\nospaceforul\formshade\horzdoc\dgmargin\dghspace180\dgvspace180\dghorigin1701\dgvorigin1984\dghshow1\dgvshow1\jexpand\doctype2\viewkind5\viewscale100\pgbrdrhead\pgbrdrfoot\splytwnine\ftnlytwnine\htmautsp\nolnhtadjtbl\useltbaln\alntblind\lytcalctblwd\lyttblrtgr\lnbrkrule\nobrkwrptbl\snaptogridincell\allowfieldendsel\wrppunct\asianbrkrule\rsidroot4288638 \fet0{*\wgrffmtfilter 013f}{*\background {\shp{*\shpinst\shpleft0\shptop0\shpright0\shpbottom0\shpfhdr0\shpbxmargin\shpbxignore\shpbymargin\shpbyignore\shpwr0\shpwrk0\shpfblwtxt1\shpz0\shplid1025{\sp{\sn shapeType}{\sv 1}}{\sp{\sn fFlipH}{\sv 0}}{\sp{\sn fFlipV}{\sv 0}}{\sp{\sn fillType}{\sv 2}}{\sp{\sn fillBlip}{\sv {\pict\picscalex-1\picscaley-1\piccropl0\piccropr0\piccropt0\piccropb0\picw56444\pich106\picwgoal32000\pichgoal60\jpegblip\bliptag-1362886559{*\blipuid aec40061680f0f0063689db7951c1a37}\bin2743 ﾘ・ JFIF H H ・ｪPhotoshop 3.0 8BIM ・ x H H ﾚ (・・・E G ( ・ H H ﾘ ( d ' ` ・ 8BIM ・ H H 8BIM ・ 8BIM
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Cheong00 3,426 Reputation points

2020-12-09T03:09:22.2+00:00

Since the error message is "External Component has thrown an error", it helps if you can give more description of the RTF file that make it throw the error, like whether there is image embedded, and if so then what is the image format.

Generally this kind of error are related the embedded objects (including images) that don't have native support by RichTextBox control.

Also note that by the method name, you're using RichTextBox provided by System.Windows.Forms.dll which is a wrapper around Windows Common Control Library. I remember read it somewhere that the current version of RichTextBox there does not implement the latest version of RTF format at that time, which is produced by saving files as RTF in WordPad. Not sure if this still hold true in Win10.
viral patel 1 Reputation point

2020-12-09T16:58:07.557+00:00

Hi,

I have updated RTF content, but my concern is if it works in the older .net framework but not in new .net framework.

Thanks
Cheong00 3,426 Reputation points

2020-12-10T07:29:09.6+00:00

You can't just paste the RTF content as text because the embedded JPEG image is binary data.

However this does provide some information for me to check... First the JPEG image is in 8BIM codec of Adobe and is supported by Win7 so no need to check for possibility caused by 32/64-bit support of image.

The other part of it just seems like RTF content extracted from typical RTF email. Nothing too alarming from inspection by my naked eyes.
viral patel 1 Reputation point

2020-12-10T12:02:07.363+00:00

Hi,

Thanks for Information, we have Win 10 OS.
And tried with 32 and 64 bit operations with this RTF content using Framework 4.7 but in both it gives same external component error.

Where as there is no concern with execution in Framework 4.6.

Thanks

Daniel Zhang-MSFT 9,476

Hi @viral patel ,
Since RichTextBox from Forms namespace is tolerant to problematic RTF files, so you can try to load the file firstly into a temporary control and then transfer the fixed RTF to your control.
Please try the following code:

using (var rtf2 = new System.Windows.Forms.RichTextBox())  
    {  
        rtf2.LoadFile(fileName, Forms.RichTextBoxStreamType.RichText);  
        using (var ms = new MemoryStream())  
        {  
            rtf2.SaveFile(ms, Forms.RichTextBoxStreamType.RichText);  
            ms.Position = 0L;  
            rtf.SelectAll();  
            rtf.Selection.Load(ms, System.Windows.DataFormats.Rtf);  
        }  
    }

Best Regards,
Daniel Zhang

Cheong00 3,426 Reputation points

2020-12-09T03:09:22.2+00:00

Since the error message is "External Component has thrown an error", it helps if you can give more description of the RTF file that make it throw the error, like whether there is image embedded, and if so then what is the image format.

Generally this kind of error are related the embedded objects (including images) that don't have native support by RichTextBox control.

Also note that by the method name, you're using RichTextBox provided by System.Windows.Forms.dll which is a wrapper around Windows Common Control Library. I remember read it somewhere that the current version of RichTextBox there does not implement the latest version of RTF format at that time, which is produced by saving files as RTF in WordPad. Not sure if this still hold true in Win10.
viral patel 1 Reputation point

2020-12-09T16:58:07.557+00:00

Hi,

I have updated RTF content, but my concern is if it works in the older .net framework but not in new .net framework.

Thanks
Cheong00 3,426 Reputation points

2020-12-10T07:29:09.6+00:00

You can't just paste the RTF content as text because the embedded JPEG image is binary data.

However this does provide some information for me to check... First the JPEG image is in 8BIM codec of Adobe and is supported by Win7 so no need to check for possibility caused by 32/64-bit support of image.

The other part of it just seems like RTF content extracted from typical RTF email. Nothing too alarming from inspection by my naked eyes.
viral patel 1 Reputation point

2020-12-10T12:02:07.363+00:00

Hi,

Thanks for Information, we have Win 10 OS.
And tried with 32 and 64 bit operations with this RTF content using Framework 4.7 but in both it gives same external component error.

Where as there is no concern with execution in Framework 4.6.

Thanks
Daniel Zhang-MSFT 9,476 Reputation points

2020-12-11T07:42:30.793+00:00

Hi @viral patel ,
Since RichTextBox from Forms namespace is tolerant to problematic RTF files, so you can try to load the file firstly into a temporary control and then transfer the fixed RTF to your control.
Please try the following code:

using (var rtf2 = new System.Windows.Forms.RichTextBox()) { rtf2.LoadFile(fileName, Forms.RichTextBoxStreamType.RichText); using (var ms = new MemoryStream()) { rtf2.SaveFile(ms, Forms.RichTextBoxStreamType.RichText); ms.Position = 0L; rtf.SelectAll(); rtf.Selection.Load(ms, System.Windows.DataFormats.Rtf); } }

Best Regards,
Daniel Zhang

Answer 1

Daniel Zhang-MSFT 9,476

Hi viralpatel-5130,
I made a test with your code in in .NetFramework 4.6 and in in .NetFramework 4.7, They all worked fine.
Here is my test code and RTF file.

private void Form1_Load(object sender, EventArgs e)  
{  
    RichTextBox RtfContent = new RichTextBox();  
    RtfContent.LoadFile(@"C:\Users\Desktop\t1.rtf", RichTextBoxStreamType.RichText);  
    this.Controls.Add(RtfContent);  
}

t1.rtf

And you said that Loading with PlainText type working fine. So I guess the problem is in your rtf file.
PlainText means a plain text stream that includes spaces in places of Object Linking and Embedding (OLE) objects.
RichText means a Rich Text Format (RTF) stream.
In order to find the problem more accurately, please provide your RTF file and more details.
As document said, you can also try to initialize the OpenFileDialog to look for RTF files.
Best Regards,
Daniel Zhang

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viral patel 1 Reputation point

2020-12-09T16:58:47.013+00:00

Hi,

I have updated RTF content, but my concern is if it works in the older .net framework but not in new .net framework.

Thanks
Cheong00 3,426 Reputation points

2020-12-10T07:48:55.577+00:00

You may want to try embed "C:\Program Files\Common Files\Microsoft Shared\Stationery\Glacier Bkgrd.jpg" from Stationery come from Outlook to the RTF and test if the RichTextBox can load it without problem. I suspect it should be okay though.
viral patel 1 Reputation point

2020-12-17T09:54:57.757+00:00

Hi,

As per below comment, i am trying to load embedded object but there is no file found in my machine at below location,

C:\Program Files\Common Files\Microsoft Shared\Stationery

This is client side production issue, so i may not fix the .netframework 4.7 to run same as .net Framework 4.6.
Is there any way we can upfront identify RTF has some embedded content which may cause this kind of issue ?

Thanks
Kyle Wang 5,511 Reputation points

2020-12-18T09:39:06.733+00:00

First, what is the type of your project? Winforms or WPF? The rtf you provided is too long and shown in wrong format on the web page, which is difficult to test. If you are sure this is caused by the .NET Framework version. Try to report the problem on the Developer Community.

Windows RichTextBox Problem

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