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C++ Help: LNK2019 and AU3_ControlClick

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I have a small issue with ControlClick throwing up a LNK2019 error in Visual C++ 2010 Express. I'm a bit new to C++ (started learning 3 days ago to be precise) but I've done some C, Java, and of course AutoIT. I've already written this in AutoIT and it worked fine, I am just porting it to C++.

void tabSelect()
int selected = 0;
wchar_t tabText[5];
while (selected == 0)
  AU3_ControlClick(L"", L"", L"[CLASS:SysTabControl32]", L"",1,175,30);

  if (tabText == L"RS232")
   selected = 1;
   AU3_ControlClick(L"", L"", L"[CLASS:SysTabControl32]", L"",1,175,10);

To summarise: I'm selecting a tab labeled "RS232". The tab is designed (by the company who made it, badly) so that all of the tabs are merged into one large object so I have to click co-ordinates. Once clicked, I then have to check for the specific text "RS232" to be present on the whole screen.

Anyway, this throws up an error:

1>------ Build started: Project: CTA5, Configuration: Debug Win32 ------
1>main.obj : error LNK2019: unresolved external symbol _AU3_ControlClick@28 referenced in function "void __cdecl tabSelect(void)" (?tabSelect@@YAXXZ)
1>\\ocz.ocz.uk\export\Hardware\A001H05\Experiments\CPP\CTA5\Debug\CTA5.exe : fatal error LNK1120: 1 unresolved externals
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

I've come across the LNK2019 before (I hadn't included the AutoITX3.lib file), but this time around I'm stumped as to what the issue is.

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