C / C++ / MFC

<br />
#ifdef _UNICODE<br />
typedef std::wstring _astr;<br />
#else<br />
typedef std::string _astr;<br />
#endif<br />
<br />
namespace SalieriFoundation<br />
{<br />
   namespace Globals<br />
   {<br />
     void Func(const _astr &message)<br />
     {<br />
      ...<br />
     }<br />
   }<br />
}<br />

<br />
using namespace SalieriFoundation::Globals;<br />
<br />
Func(_T("the message"));<br />

<br />
<br />
Main.obj : error LNK2019: unresolved external symbol "void __cdecl SalieriFoundation::Globals::Func(class std::basic_string < unsigned short,struct std::char_traits < unsigned short > ,class std::allocator < unsigned short > > const &)" (?Func@Globals@SalieriFoundation@@YAXABV?$basic_string@GU?$char_traits@G@std@@V?$allocator@G@2@@std@@@Z) referenced in function _main<br />

case WM_NOTIFY:
{
    switch(LOWORD(wParam))
    {
         case IDC_LIST: 
         {
              if(((LPNMHDR)lParam)->code == NM_CUSTOMDRAW)
              {
                 NMLVCUSTOMDRAW *cdraw = (NMLVCUSTOMDRAW*)lParam;
                        
                 if (cdraw->nmcd.dwDrawStage == CDDS_PREPAINT)
                     return CDRF_NOTIFYITEMDRAW;

                 if (cdraw->nmcd.dwDrawStage == CDDS_ITEMPREPAINT || cdraw->nmcd.dwDrawStage == CDDS_SUBITEM)
                 {      
                    COLORREF crText;
                            
                     if ( cdraw->iSubItem==2 )
                          crText = RGB(255,0,0);
                     else if ( cdraw->iSubItem==1 )
                          crText = RGB(0,255,0);
                     else
                          crText = RGB(128,128,255);
                            
                     cdraw->clrText = crText;
                            
                     return CDRF_DODEFAULT;
                 }
                        
              }
	}
    }	
}

LRESULT FAR PASCAL FrameCallbackProc(HWND hWnd, LPVIDEOHDR lpVHdr)<br />
{<br />
	VOID* data=NULL;<br />
	data=malloc(lpVHdr->dwBytesUsed);<br />
	ZeroMemory(data,lpVHdr->dwBytesUsed);<br />
	memcpy(data,lpVHdr->lpData,lpVHdr->dwBytesUsed);<br />
<br />
	BITMAPINFO BitmapInfo;<br />
	capGetVideoFormat(hWnd,&BitmapInfo,sizeof(BitmapInfo));<br />
<br />
	HBITMAP hBitmap=::CreateDIBSection(0,&BitmapInfo,DIB_RGB_COLORS,&data,NULL,0); <br />
<br />
	CBitmap bmp;<br />
	bmp.Attach(hBitmap);<br />
	m_Pic.SetBitmap(hBitmap);<br />
<br />
	delete data;    //commenting this out makes no difference<br />
<br />
	return (LRESULT)TRUE;<br />
}