Resolving Errors-> error LNK2020: unresolved token (0A000010) IID_IStorage and BackGUI.obj : error LNK2001: unresolved external symbol IID_IStorage

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Hello,
In my "Windows Form Application" project, i have created Button. On Button click , I want to open compound file present on my hard disk using function StgOpenStorageEx(). the code i have written code for this in button click event as

C#

private: System::Void button1_Click(System::Object^  sender, System::EventArgs^  e) {
            IStorage    *pStorage;               if(StgOpenStorageEx(L"E:\\Backup.stg",STGM_READ|STGM_SHARE_DENY_WRITE,STGFMT_DOCFILE,0, NULL, 0,IID_IStorage,(void**)&pStorage)==S_OK)
            {
                tb4->Text="hehe";
            }
         }

for this i have added header files like

XML

#include "StdAfx.h"
#include<Objbase.h>

Also I have added "Ole32.lib" in proj->properties->Linker->input->additional dependencies.
But still im getting following errors

VB

1>BackGUI.obj : error LNK2020: unresolved token (0A000010) IID_IStorage
1>BackGUI.obj : error LNK2001: unresolved external symbol IID_IStorage
1>C:\Users\SUMIT\Desktop\prj\BACKUP & RESTORE\BackGUI\Debug\BackGUI.exe : fatal error LNK1120: 2 unresolved externals

any suggestions plz??

Posted 25-Apr-11 9:46am

MartinTaylor

Updated 25-Apr-11 11:37am

v4

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Albert Holguin 25-Apr-11 20:29pm

this looks familiar:
http://social.msdn.microsoft.com/Forums/en-US/vcgeneral/thread/86a81973-6171-4fac-b671-a162843700a5

Albert Holguin 25-Apr-11 20:31pm

...and here:
http://www.codeproject.com/Questions/185946/error-LNK2020-unresolved-token-0A000017-IID_IStora.aspx?display=PrintAll

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Albert Holguin · Accepted Answer · 2011-04-25T14:40:00

if you look here:
http://msdn.microsoft.com/en-us/library/aa380015%28VS.85%29.aspx[^]

...it says "IID_IStorage is defined as 0000000B-0000-0000-C000-000000000046", so why don't you try to define it yourself, its probably defined somewhere that you forgot to include or you have to define it yourself to use it.

So try this (although looking at some of the other references, you probably need to use the DEFINE_GUID() macro since its a large number rather than text)...

C++

#ifndef IID_IStorage
#define IID_IStorage "0000000B-0000-0000-C000-000000000046"
#endif

Here you can see where someone defined that in their code (using DEFINE_GUID() macro):
http://express-os.googlecode.com/svn-history/r51/express-os/bin/sh.cpp[^]

...and yet another reference:
http://force7.de/nimrod/ole2.html#119[^]