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AnswerRe: How to send NULL to a IUnknown** parameter when COM object is surrogate hosted [modified] Pin
tolw2-Sep-10 22:16
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GeneralRe: How to send NULL to a IUnknown** parameter when COM object is surrogate hosted Pin
Per Nilsson3-Sep-10 0:07
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QuestionWSACancelBlockingCall Pin
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QuestionHow to deal with such situation?(Need pass STL vector to dll under vs2008) [modified] Pin
fantasy121523-Aug-10 18:04
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AnswerRe: How to deal with such situation?(Need pass STL vector to dll under vs2008) Pin
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QuestionQuestion about IOleObject::GetClipboardData Pin
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QuestionObject Initialization Problem Pin
pjdriverdude6-Aug-10 5:17
pjdriverdude6-Aug-10 5:17 
AnswerRe: Object Initialization Problem Pin
Sauro Viti6-Aug-10 5:42
professionalSauro Viti6-Aug-10 5:42 
The most significant information is done by your first attempt:


  1. error C2259: cannot instantiate abstract class due to following members: unsigned long __stdcall IUnknown::AddRef(void)
    As the compiler said, you cannot instantiate this class in any way, because it misses something; if you write the code of that class the solution is obvious: implement unsigned long __stdcall IDgnWords::AddRef(void) and this will fix you problem
  2. by writing IDgnWords* words; you have allocated only a pointer to that class, but you should initialize it with new IDgnWords() before use it. If you don't do it, the pointer hold a random address and trying to use it generates a memory protection faultCComPtr<IDgnWords> words; declares a smart-pointer to the IDgnWords class, then all that I said about IDgnWords* words; is still valid, and this is the reason of your crash. CComPtr simply wraps a IDgnWords* and calls the Release() method for you when the variable goes out of scope

GeneralRe: Object Initialization Problem Pin
pjdriverdude6-Aug-10 6:17
pjdriverdude6-Aug-10 6:17 
GeneralRe: Object Initialization Problem Pin
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GeneralRe: Object Initialization Problem Pin
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QuestionError in Excel Add in Pin
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QuestionHow to call C# function from unmanaged C++ code.? Pin
deadlyabbas20-Jul-10 20:59
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AnswerRe: How to call C# function from unmanaged C++ code.? Pin
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QuestionWhy CreateWindowEx() function failed on 64 Bit window XP Pin
am 200920-Jul-10 7:02
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QuestionRe: Why CreateWindowEx() function failed on 64 Bit window XP Pin
Randor 20-Jul-10 7:08
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AnswerRe: Why CreateWindowEx() function failed on 64 Bit window XP Pin
am 200920-Jul-10 22:06
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AnswerRe: Why CreateWindowEx() function failed on 64 Bit window XP Pin
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GeneralRe: Why CreateWindowEx() function failed on 64 Bit window XP Pin
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QuestionType mismatch when calling a VB.NET COM class from VB6 Pin
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QuestionHow to develop 64 bit application using VS2005 Pin
am 200915-Jul-10 1:45
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AnswerRe: How to develop 64 bit application using VS2005 Pin
«_Superman_»17-Jul-10 19:25
professional«_Superman_»17-Jul-10 19:25 
GeneralRe: How to develop 64 bit application using VS2005 Pin
am 200918-Jul-10 19:09
am 200918-Jul-10 19:09 
GeneralRe: How to develop 64 bit application using VS2005 Pin
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