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Hot Topic (More than 10 Replies) Serializing AnchorPatterns (Read 6603 times)
Remko
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Serializing AnchorPatterns
Jan 5th, 2006 at 12:06pm
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Hi,
one quick question, are AnchorPatterns created for a BoxItem serialized with the flowchart ?

Remko
  
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Stoyo
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Re: Serializing AnchorPatterns
Reply #1 - Jan 5th, 2006 at 1:03pm
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Hi,

Only pattern's PatternId is saved. When a patternId is loaded from a file, the AnchorPattern with that id must be defined in your application.

Stoyan
  
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Remko
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Re: Serializing AnchorPatterns
Reply #2 - Jan 5th, 2006 at 1:16pm
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Ok,
I guessed as much, but that brings me to the next problem/challenge.

When i try to serialize the Pattern myself with
Code
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// stream out the dockingPoints
	  long anchorPoints = m_dockingPoints.GetAnchorPointCount();
	  ar << anchorPoints;
	  for ( long i = 0; i < anchorPoints; i++ ) {
		m_dockingPoints.GetAnchorPoint( i, &x, &y, &in, &out, &mark, &color, &chArrStyle, &arrStyle, &segments );
		ar << x << y << in << out << mark << color;
	  }


I am rewarded with a rather undescriptive OleException, any ideas ?.


(a thought just hit me, could it have to do with the VARIANT_BOOL vs. BOOL size problem in MFC wrappers ?)

Remko
  
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Stoyo
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Re: Serializing AnchorPatterns
Reply #3 - Jan 5th, 2006 at 1:33pm
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Is there any HRESULT code mentioned ?

The VARIANT_BOOL vs. BOOL problem happens when overwriting a VARIANT_BOOL value through a BOOL pointer, i.e. writing 4 bytes to 2-bytes memory location . GetAnchorPoint gets VARIANT_BOOL values through BOOL* pointers, writing 2-bytes to 4-bytes memory location, so there should not be a problem with that.

Stoyan
  
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Remko
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Re: Serializing AnchorPatterns
Reply #4 - Jan 5th, 2006 at 1:45pm
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Stepping through the call I found:

Warning: constructing COleException, scode = DISP_E_TYPEMISMATCH ($80020005).




to be complete, the exception is thrown in the GetAnchorPoint method(), so I'm pretty shure it's not the m_dockingPoints being invalid as the GetAnchorPointsCount() yields the expected result.


Remko
  
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Remko
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Re: Serializing AnchorPatterns
Reply #5 - Jan 5th, 2006 at 2:07pm
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Some more info,

after
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SCODE sc = m_lpDispatch->Invoke(dwDispID, IID_NULL, 0, wFlags,
&dispparams, pvarResult, &excepInfo, &nArgErr);


nArgErr == 3

which would be the BOOL *in parameter

which is defined as
Code
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static BYTE parms[] =
VTS_I4 VTS_PI2 VTS_PI2 VTS_PBOOL VTS_PBOOL VTS_PI4 VTS_PI4 VTS_PBOOL VTS_PI4 VTS_PI2;

i.e. VTS_PBOOL,  in the generated MFC wrappers.

Remko
  
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Stoyo
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Re: Serializing AnchorPatterns
Reply #6 - Jan 5th, 2006 at 2:10pm
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That could be returned by the standard OLE implementation of IDispatch. Try calling the method directly through the VTBL IFlowChart* pointer; that will bypass the IDispatch parameter translation layer. I.e. use the "flowchart'h" included with the control and query for IID_IFlowChart, then call the GetAnchorPoint method using the exact parameter types.

Stoyan
  
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Remko
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Re: Serializing AnchorPatterns
Reply #7 - Jan 5th, 2006 at 2:32pm
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My memory is definitly deteriorating Sad

I just found that I've had the same problem while handling the OnDrawMark event ....  Embarrassed
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   IUnknown *unknown = m_dockingPoints.m_lpDispatch;
		IAnchorPattern *pat;
		unknown->QueryInterface( &pat );
		pat->GetAnchorPoint( i,
				     &px,
				     &py,
				     &in,
				     &out,
				     &mark,
				     &color,
				     &changeStyle,
			    &style,
			    &segments );


works just fine.

(that reminds me that there is a problem when you mix the standard flowchart.h and the MFC wrappers, several types get defined in both versions .... minor problem though)

Yet again, thanks for the support,
Remko
  
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Stoyo
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Re: Serializing AnchorPatterns
Reply #8 - Jan 5th, 2006 at 2:43pm
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It seems that GetAnchorPattern method is undocumented and was implemented for internal use - the XmlWriter uses it. So the XmlWriter writes all information related to an anchor pattern, but in binary format only the pattern id is saved.

Stoyan
  
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Remko
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Re: Serializing AnchorPatterns
Reply #9 - Jan 6th, 2006 at 8:18am
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Ok, I allready had a suspicion it might be internal (the function not being mentioned in the docs was a bit of a giveaway Smiley).

But OTOH GetAnchorPoint() is quite usefull when you need to get info about anchorpatterns, so maybe you could add it to the list of feature requests ?.
  
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Re: Serializing AnchorPatterns
Reply #10 - Jan 6th, 2006 at 9:19am
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Sure, and we'll probably implement some more humane way to get anchor point information, e.g. with and array of AnchorPoint objects that expose their info  as properties.
  
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