A LPSHELLFOLDER problem

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VC6

C++

I want to create a LPSHELLFOLDER according to a path

void CLeftView::ParseSHFromPath(LPCSTR path,LPSHELLFOLDER &psfFolder)
{
	     
 LPSHELLFOLDER psfDesktop;
 SHGetDesktopFolder(&psfDesktop);
 OLECHAR olePath[MAX_PATH];   //   wide-char   version   of   path   name   
 MultiByteToWideChar(CP_ACP,MB_PRECOMPOSED,path,-1,olePath,MAX_PATH);   
 LPITEMIDLIST pidl = NULL;   //   general   purpose   
 psfDesktop->ParseDisplayName(NULL,NULL,olePath,NULL,&pidl,NULL);  
 psfDesktop->BindToObject(pidl,NULL,IID_IShellFolder,(void**)&psfFolder);
		

}

Then when i use

STRRET str;
hr=SHGetDesktopFolder(&lpsf,SHGDN_NORMAL,str);

Then a ram error occurred ,can any one help me