Прототип функции не виден внутри класса...

typedef  void (_stdcall *LPVDACQ_GETFRAMEDIM)( int*, int* );

LPVDACQ_GETFRAMEDIM  lpVDACQ_GetFrameDim;

  bool (INSTAPI *CreateODBC)(HWND hwndParent, WORD fRequest, LPCSTR lpszDriver, LPCSTR lpszAttributes);

  HINSTANCE Odbc = LoadLibrary("odbccp32.dll");
  AnsiString driver = "Oracle in OraClient10g_home1";
  // Создадим пользовательский DSN
  CreateODBC = (bool (INSTAPI*)(HWND hwndParent, WORD fRequest, LPCSTR lpszDriver, LPCSTR lpszAttributes))::GetProcAddress(Odbc,"SQLConfigDataSource");
  bool iCode = (*(CreateODBC))(NULL, ODBC_ADD_SYS_DSN, driver.c_str(), "DSN=NarDB\0" "EXECSchemaOpt=\0" "EXECSyntax=0\0"
  "Failover=1\0" "FailoverDelay=10\0" "FailoverRetryCount=10\0" "FetchBufferSize=64000\0" "ForceWCHAR=0\0" "Lobs=1\0"
  "MetadataIdDefault=0\0" "NumericSetting=NLS\0" "Password=dbo\0" "QueryTimeout=1\0" "ResultSets=1\0"
  "ServerName=astra46\0" "UserID=dbo\0");
  FreeLibrary(Odbc);

HINSTANCE hDLL;
hDLL=LoadLibrary( "dll.dll" );
lpVDACQ_GetFrameDim = (LPVDACQ_GETFRAMEDIM)GetProcAddress( hDLL, "VDACQ_GetFrameDim" );

typedef  tVDACQ_CallBackRec* (_stdcall *LPVDACQ_CONNECT)( int, tVDACQ_CallBackProc, void*, short*, int );

typedef struct {
    int    rFlags,            
           rType,             
           rEvent,            
           rSocket;          
    TCHAR  rMsg[256];      
    int    rFrameWidth,    
           rFrameHeight; 
    short *rFrameBuffer;    
    int    rCaptureRows,     
           rCapturePercent;   
    void  *rUserCallBackProc, 
          *rUserParam;      
    int    rAborted;         
    void  *rPacketData;      
  } tVDACQ_CallBackRec;

typedef void static (_stdcall *tVDACQ_CallBackProc)( tVDACQ_CallBackRec* );