Question

Memory Leak in SHGetSpecialFolderLocation API

Asked by: harish_dixit1

Hi,

When i use following code in my COM DLL and call that API from C++ application then it is showing memory leak . But if i use same code directly from my test appl then it is not showing any leak.
Can someone please help here?

Signature of my COM DLL API  is:

[propget, id(1)] HRESULT CustomPath(
            [out, retval] BSTR* pVal);





LPITEMIDLIST pidl;
		
		SHGetSpecialFolderLocation(NULL, CSIDL_MYPICTURES , &pidl);
		
		TCHAR buf[MAX_PATH*2];
		!SHGetPathFromIDList(pidl,buf);
 
		CoTaskMemFree (pidl);
		CString strPath = buf;

                                  
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Asked On
2009-08-13 at 23:31:33ID24652136
Topics

Kernel And Operating System Specific Programming

,

C++ Programming Language

Participating Experts
3
Points
500
Comments
4

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Answers

 

by: jkrPosted on 2009-08-14 at 09:07:18ID: 25099627

There's nothing in the above that would cause any apparent memory leak. But, BTW: Since you are interested in the path name, why not using

TCHAR buf[MAX_PATH*2];
SHGetSpecialFolderPath(NULL,buf,CSIDL_MYPICTURES,FALSE);

instead?

 

by: InvaderPosted on 2009-08-25 at 04:30:41ID: 25176339

Apparently, the memory leak is  not caused by this code but by some other code in your DLL.

What else is in the function you are calling ?

 

by: wieser-software-ltdPosted on 2009-09-02 at 23:52:22ID: 25248327

Where are you allocating your BSTR to return?  Do you return strPath.AllocSysString to send the BSTR?

 

by: wieser-software-ltdPosted on 2009-09-15 at 00:12:51ID: 25332454

Also, in C++ if you return a BSTR as an out param, you'll need the caller to call SysFreeString on the value.

20120131-EE-VQP-002

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