FatalExecutionE ngineError calling Clipboard.GetDa taObject().GetD ata() with EnhancedMetafil e

[nagar]

I have a .NET 2.0 application that needs to backup and restore the
contents of the clipboard.

When I back it up, I use this code:

DataObject oldClipboard = Clipboard.GetDa taObject();
IDataObject prevClipboard = new DataObject();

string[] formats;
formats = oldClipboard.Ge tFormats(); //gets all the possible formats
for that data
foreach (string s in formats) {
object clipdata = oldClipboard.Ge tData(s);
prevClipboard.S etData(s, clipdata ); //re-associate the old
data with the proper types
}

I got the error on the oldClipboard.Ge tData(s) line when the data in
the clipboard is of type "EnahancedMetaf ile" (I could reproduce it
copying a piece of text which contained an HTML email from OneNote).

The error message says: Error address 0x79f387cc. Error code
0xc0000005

I saw there's no way I can trap this error in the code. At the moment,
I'm just ignoring the "EnhancedMetafi le" format.

Thanks.
Andrea

[Walter Wang [MSFT]]

Hi Andrea,

This is because .NET Framework uses a new Clipboard format for the
metafiles, to interop with other programs, we will have to use Clipboard
APIs to get/put the metafiles:

#PRB: Metafiles on Clipboard Are Not Visible to All Applications
http://support.microsoft.com/kb/323530

The above KB only has a method to put a metafile on clipboard, I've added
another function to get the metafile from clipboard:
private const int CF_ENHMETAFILE = 14;
[DllImport("user 32.dll")]
private static extern int IsClipboardForm atAvailable(int wFormat);
[DllImport("user 32.dll")]
private static extern IntPtr GetClipboardDat a(int wFormat);

static public Metafile GetEnhMetafileO nClipboard(IntP tr hWnd)
{
Metafile meta = null;
if (OpenClipboard( hWnd))
{
try
{
if (IsClipboardFor matAvailable(CF _ENHMETAFILE) != 0)
{
IntPtr hEMF = GetClipboardDat a(CF_ENHMETAFIL E);
meta = new Metafile(hEMF, true);
}
}
finally
{
CloseClipboard( );
}
}
return meta;
}

Add above code in the KB's class ClipboardMetafi leHelper, passed following
test code:

Metafile mf = ClipboardMetafi leHelper.GetEnh MetafileOnClipb oard(Handle);
if (mf != null)
{
ClipboardMetafi leHelper.PutEnh MetafileOnClipb oard(Handle, mf);
}
Hope this helps.
Regards,
Walter Wang (wa****@online. microsoft.com, remove 'online.')
Microsoft Online Community Support

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[nagar]

Thanks Walter.
Currently, I've solved my problem avoiding to backup the metafile data
(I noticed that v.1.1 of the framework worked fine). Do you know if
there are other breaking changes with other file formats in .NET 2.0?
Thanks
Andrea

On Wed, 08 Aug 2007 08:13:07 GMT, wa****@online.m icrosoft.com ("Walter
Wang [MSFT]") wrote:

>Hi Andrea,

This is because .NET Framework uses a new Clipboard format for the
metafiles, to interop with other programs, we will have to use Clipboard
APIs to get/put the metafiles:

#PRB: Metafiles on Clipboard Are Not Visible to All Applications
http://support.microsoft.com/kb/323530

The above KB only has a method to put a metafile on clipboard, I've added
another function to get the metafile from clipboard:
private const int CF_ENHMETAFILE = 14;
[DllImport("user 32.dll")]
private static extern int IsClipboardForm atAvailable(int wFormat);
[DllImport("user 32.dll")]
private static extern IntPtr GetClipboardDat a(int wFormat);

static public Metafile GetEnhMetafileO nClipboard(IntP tr hWnd)
{
Metafile meta = null;
if (OpenClipboard( hWnd))
{
try
{
if (IsClipboardFor matAvailable(CF _ENHMETAFILE) != 0)
{
IntPtr hEMF = GetClipboardDat a(CF_ENHMETAFIL E);
meta = new Metafile(hEMF, true);
}
}
finally
{
CloseClipboard( );
}
}
return meta;
}

Add above code in the KB's class ClipboardMetafi leHelper, passed following
test code:

Metafile mf = ClipboardMetafi leHelper.GetEnh MetafileOnClipb oard(Handle);
if (mf != null)
{
ClipboardMetafi leHelper.PutEnh MetafileOnClipb oard(Handle, mf);
}
Hope this helps.
Regards,
Walter Wang (wa****@online. microsoft.com, remove 'online.')
Microsoft Online Community Support

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that others may learn and benefit from your issue.
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[Walter Wang [MSFT]]

Hi Andrea,

Thanks for your quick reply.

I'll ask the KB owner to see if there's any other changes related to this
behavior. I'll keep you posted.
Regards,
Walter Wang (wa****@online. microsoft.com, remove 'online.')
Microsoft Online Community Support

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[Walter Wang [MSFT]]

Hi Andrea,

I've consulted your question and got following information for you:

1) The CF_ENHMETAFILE data format isn't compatible with .NET's
DataFormats.Enh ancedMetafile, this applies for both .NET Framework 1.1 and
2.0; but .NET 1.1 it's not throwing exception, the return value is
undefined.

2) So far we're not aware of any other data formats are not compatible with
standard formats.

Hope this helps.

Regards,
Walter Wang (wa****@online. microsoft.com, remove 'online.')
Microsoft Online Community Support

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[Walter Wang [MSFT]]

Hi Andrea,

I'm writing to check the status of this post. Please feel free to let me
know if there's anything else I can help. Thanks.

Regards,
Walter Wang (wa****@online. microsoft.com, remove 'online.')
Microsoft Online Community Support

=============== =============== =============== =====
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that others may learn and benefit from your issue.
=============== =============== =============== =====

This posting is provided "AS IS" with no warranties, and confers no rights.