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AnswerRe: VS2010 vs VS2008 generated IDL differences that generates midl compilation error. Pin
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QuestionException during assignment operation to a COM object - "Attempted to read or write protected memory" Pin
asr11227-Jul-10 3:20
asr11227-Jul-10 3:20 
Hi.

I have a piece of code at client side which calls a method of a COM server to create and return an object. While trying to assign values to data members of this object, I get the following exception - "Attempted to read or write protected memory. This is often an indication that other memory is corrupt."

I don't have much exposure to COM so am quite clueless as to how to solve this. Parts of the source are pasted below.

<IDL>

interface _ICallInfo: IDispatch
{
[
propget,
id(1),
helpstring("Call ID")
]
HRESULT CallId([out, retval] LONG *pVal);

[
propput,
id(1),
helpstring("Call ID")
]
HRESULT CallId([in] LONG nCallId);

[
propget,
id(2),
helpstring("Barge Call")
]
HRESULT CallType([out, retval] LONG *nCallType);

[
propput,
id(2),
helpstring("Call Type")
]
HRESULT CallType([in] LONG nCallType);
};

dispinterface _IApplication
{
[
id(3),
helpstring("method CreateCallInfo")
]
HRESULT CreateCallInfo([out]_ICallInfo** piResult);
};


<Client side - a C# client>

public void foo()
{
CallInfo callInfo = null;
CreateCallInfo(out callInfo);


try
{
callInfo.CallId = this.CallId;
callInfo.CallType = (int)this.CallType;
}
catch (Exception ex)
{
//Exception here
}
}


Any help will be appreciated.
Thanks.
AnswerRe: Exception during assignment operation to a COM object - "Attempted to read or write protected memory" Pin
Richard MacCutchan7-Jul-10 4:06
mveRichard MacCutchan7-Jul-10 4:06 
GeneralRe: Exception during assignment operation to a COM object - "Attempted to read or write protected memory" Pin
asr11227-Jul-10 20:44
asr11227-Jul-10 20:44 
GeneralRe: Exception during assignment operation to a COM object - "Attempted to read or write protected memory" Pin
Richard MacCutchan7-Jul-10 22:19
mveRichard MacCutchan7-Jul-10 22:19 
GeneralRe: Exception during assignment operation to a COM object - "Attempted to read or write protected memory" Pin
asr11227-Jul-10 23:32
asr11227-Jul-10 23:32 
GeneralRe: Exception during assignment operation to a COM object - "Attempted to read or write protected memory" Pin
asr11228-Jul-10 4:05
asr11228-Jul-10 4:05 
GeneralRe: Exception during assignment operation to a COM object - "Attempted to read or write protected memory" Pin
Richard MacCutchan9-Jul-10 22:19
mveRichard MacCutchan9-Jul-10 22:19 
GeneralRe: Exception during assignment operation to a COM object - "Attempted to read or write protected memory" Pin
Vi212-Jul-10 1:05
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GeneralRe: Exception during assignment operation to a COM object - "Attempted to read or write protected memory" Pin
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QuestionDifference between COM Component and Class Pin
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AnswerRe: Difference between COM Component and Class Pin
Richard MacCutchan5-Jul-10 3:25
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GeneralRe: Difference between COM Component and Class Pin
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GeneralRe: Difference between COM Component and Class Pin
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