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Large data for ActiveX control

Posted on 1999-07-11
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Last Modified: 2010-08-05
Hello,
My ActiveX control is importing a large chunk of data (>1Mb). The

DoPropExchange(CPropExchange* pPX)

function crashes with a Stack overflow on the function:

PX_String(pPX, _T("Value"), m_Value);

If I use a smaller chunk of data it works fine.
What is the limiting factor here? And how do I get around it ?

Thank you
Tom
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Question by:tomschuring
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6 Comments
 
LVL 23

Accepted Solution

by:
chensu earned 300 total points
ID: 1199737
Use Binary Large Object (BLOB) instead. See the following KB article for an example.

DOC: How to Use the PX_Blob Function
http://support.microsoft.com/support/kb/articles/Q137/3/33.asp
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Author Comment

by:tomschuring
ID: 1199738
Does this also support string loading from a html page ?
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LVL 23

Expert Comment

by:chensu
ID: 1199739
Definitely. It is binary data.
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Author Comment

by:tomschuring
ID: 1199740
With
HGLOBAL hValue; //
in header file

the function PX_Blob(pPX, _T("Value"), hValue);

immediatly returns with FALSE when DoPropertyExchange is loading,
GetLastError doesn't return the description of what went wrong.

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LVL 23

Expert Comment

by:chensu
ID: 1199741
hValue should be initialized to NULL before initially calling PX_Blob for the first time.
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Author Comment

by:tomschuring
ID: 1199742
I Did do that. I have now resolved the problem by using the get/set functions of a property and setting the large string via a bit of script. It's not very nice, I would rather have the <PARAMS..> work with any size value...
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