VC ATL, Question about SAFEARRAYS and deleteing them

Question about SAFEARRAYS and deleteing them

Author	Message
Jim Bancrof #1 / 3	Question about SAFEARRAYS and deleteing them I'm reading a COM+/ATL book (Andrew Troelsen-- very good), and in the section on SAFEARRAYS he has some code like so: STDMETHOD CCoSafeArray::UseThisSafeArrayOfStrings(VARIANT strings) { . . . SAFEARRAY *pSA = strings.parray; . . . . SafeArrayUnaccessData(pSA); SafeArrayDestroy(pSA); //what the...? Quote: } My question is: why am I destroying the SAFEARRAY? Up at the top of the function, I didn't allocate any memory for it-- I'm just pointing to the incoming parameter's copy of the array. Maybe I'm mistaken, and assigning a SAFEARRAY pointer to another array somehow allocates memory in the background? Or do you think this is a typo on the author's part? Thanks for the clarification.
Sun, 11 Jul 2004 01:59:04 GMT

Igor Tandetni #2 / 3	Question about SAFEARRAYS and deleteing them If the code indeed looks like what you show, then it is in error. "strings" is clearly an [in] parameter and should not be modified, nor its contents deallocated. I don't have a copy of the book to check though. -- With best wishes, Igor Tandetnik "For every complex problem, there is a solution that is simple, neat, and wrong." H.L. Mencken Quote: > I'm reading a COM+/ATL book (Andrew Troelsen-- very good), and in the > section on SAFEARRAYS he has some code like so: > STDMETHOD CCoSafeArray::UseThisSafeArrayOfStrings(VARIANT strings) > { > . > . > . > SAFEARRAY *pSA = strings.parray; > . > . > . > . > SafeArrayUnaccessData(pSA); > SafeArrayDestroy(pSA); //what the...? > } > My question is: why am I destroying the SAFEARRAY? Up at the top of the > function, I didn't allocate any memory for it-- I'm just pointing to the > incoming parameter's copy of the array. Maybe I'm mistaken, and assigning a > SAFEARRAY pointer to another array somehow allocates memory in the > background? Or do you think this is a typo on the author's part? Thanks > for the clarification.
Sun, 11 Jul 2004 03:22:06 GMT

Jack Ji #3 / 3	Question about SAFEARRAYS and deleteing them My experience is: when I pack a safearry into a variant as input parameter, I have to set the parameter as [in]VARIANT * var, otherwise the server cannot get correct data from VB client (C++ client no problem). The server should not destroy the embeded safearray passed via var in this case. Anybody use [in]VARIANT var pass safearrays with successful VB client usage? -- Jack Quote: > I'm reading a COM+/ATL book (Andrew Troelsen-- very good), and in the > section on SAFEARRAYS he has some code like so: > STDMETHOD CCoSafeArray::UseThisSafeArrayOfStrings(VARIANT strings) > { > . > . > . > SAFEARRAY pSA = strings.parray; > . > . > . > . > SafeArrayUnaccessData(pSA); > SafeArrayDestroy(pSA); //what the...? > } > My question is: why am I destroying the SAFEARRAY? Up at the top of the > function, I didn't allocate any memory for it-- I'm just pointing to the > incoming parameter's copy of the array. Maybe I'm mistaken, and assigning a > SAFEARRAY pointer to another array somehow allocates memory in the > background? Or do you think this is a typo on the author's part? Thanks > for the clarification.
Sun, 11 Jul 2004 03:36:25 GMT

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