Multi-function generation creates code that calls releases the memory it has no allocate

Generation of a panel based on our ActiveX component generates the code below.

My problem is that it is free memory that it does not allocate - a bad programming practice. The user must allocate a buffer for testFilePath, but this method releases.

Problem is known by a side effect of this:

http://digital.NI.com/public.nsf/allkb/205CA72511BC735C862570F80019660A?OpenDocument

John Barton

----------------------------------

HRESULT CVIFUNC XJIntegrationOCX__XJIntegrationSetTestSystem (CAObjHandle objectHandle,
ERRORINFO * errorInfo.
                                                              char * testFilePath,.
VBOOL * arg2)
{
__Result HRESULT = S_OK;
XJIntegrationOCX__XJIntegration_Interface * __vtblIFacePtr = 0;
int __didAddRef;
int __errorInfoPresent = 0;
BSTR testFilePath__AutoType = 0;
VBOOL arg2__Temp;

__caErrChk (CA_CStringToBSTR (* testFilePath, & testFilePath__AutoType));

__caErrChk (CA_GetInterfaceFromObjHandle (objectHandle,
& XJIntegrationOCX_IID__XJIntegration,
0, & __vtblIFacePtr, & __didAddRef));
__caErrChk (__vtblIFacePtr-> lpVtbl-> SetTestSystem_ (__vtblIFacePtr,
& testFilePath__AutoType,
(& arg2__Temp));

If (testFilePath)
{
        CA_FreeMemory (* testFilePath);
* testFilePath = 0;
}
If (testFilePath)
__caErrChk (CA_BSTRGetCString (testFilePath__AutoType, testFilePath));
If (arg2)
{
* arg2 = arg2__Temp;
}

Error:
CA_FreeBSTR (testFilePath__AutoType);
If (__vtblIFacePtr & __didAddRef)
__vtblIFacePtr-> lpVtbl-> Release (__vtblIFacePtr);
If (FAILED (__result))
{
If (testFilePath)
{
CA_FreeMemory (* testFilePath);
* testFilePath = 0;
}
}
CA_FillErrorInfoEx (objectHandle, & XJIntegrationOCX_IID__XJIntegration,
__result, errorInfo, & __errorInfoPresent);
If (__errorInfoPresent)
__result = DISP_E_EXCEPTION;
Return __result;
}

Hi John,.

This parameter is supposed to be an output parameter? If so, so that the code looks right to me. The function expects a string to pass, and then returns a different string via the same parameter. In this case, by the rules of the ActiveX, the method releases the original string after using it, and then allocates a new string. The only difference between a typical ActiveX interface and this wrapper CVI is that with a typical ActiveX interface it would operate the BStr strings instead of the C strings.

Because the function redistributes the buffer after the release of whatever you spend, you should not change this buffer memory management in client code. The hope is that you allocate memory initially, then call this function and then free the memory some time after the return of this function. The fact that this function of reallocation of memory at the same time should not affect this process.

If you use invalid free question, a couple of things to watch are that: 1) when you allocate memory initially, you do not use a different allocater, such as malloc in the C library, for example. If you need to allocate explicit memory, you must use CA_AllocMemory, which is what the ActiveX library and 2) that you don't have multiple references to this pointer that could potentially be released several times.

Luis

Tags: NI Software

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