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#ifndef __TWAINCPP_ 
#define __TWAINCPP_ 
 
#include "Twain.h" 
 
 
#define TWCPP_ANYCOUNT		(-1) 
#define TWCPP_CANCELTHIS	(1) 
#define TWCPP_CANCELALL		(2) 
#define TWCPP_DOTRANSFER	(0) 
 
class CTwain 
{ 
public: 
 
 
	CTwain(HWND hWnd = NULL); 
	virtual ~CTwain(); 
	BOOL InitTwain(HWND hWnd); 
	void ReleaseTwain(); 
 
 
	/*   
	  This routine must be implemented by the dervied class  
	  After setting the required values in the m_AppId structure, 
	  the derived class should call the parent class implementation 
	  Refer Pg: 51 of the Twain Specification version 1.8 
	*/ 
	virtual void GetIdentity(); 
	virtual BOOL SelectSource(); 
	virtual BOOL OpenSource(TW_IDENTITY *pSource=NULL); 
	virtual int  ShouldTransfer(TW_IMAGEINFO& info) { return TWCPP_DOTRANSFER;}; 
	 
	BOOL ProcessMessage(MSG msg); 
 
	BOOL SelectDefaultSource(); 
	BOOL IsValidDriver() const; 
	BOOL SourceSelected() const {return m_bSourceSelected;} ; 
	BOOL DSMOpen() const; 
	BOOL DSOpen() const; 
	BOOL SourceEnabled() const { return m_bSourceEnabled;}; 
	BOOL ModalUI() const { return m_bModalUI; }; 
 
	TW_INT16 GetRC() const { return m_returnCode; }; 
	TW_STATUS GetStatus() const { return m_Status; }; 
 
	BOOL SetImageCount(TW_INT16 nCount = 1); 
	BOOL Acquire(int numImages=1); 
 
protected: 
	BOOL CallTwainProc(pTW_IDENTITY pOrigin,pTW_IDENTITY pDest, 
					   TW_UINT32 DG,TW_UINT16 DAT,TW_UINT16 MSG, 
					   TW_MEMREF pData); 
 
	void CloseDSM(); 
	void CloseDS(); 
 
	BOOL GetCapability(TW_CAPABILITY& twCap,TW_UINT16 cap,TW_UINT16 conType=TWON_DONTCARE16); 
	BOOL GetCapability(TW_UINT16 cap,TW_UINT32& value); 
	BOOL SetCapability(TW_UINT16 cap,TW_UINT16 value,BOOL sign=FALSE); 
	BOOL SetCapability(TW_CAPABILITY& twCap); 
	BOOL EnableSource(BOOL showUI = TRUE); 
 
	BOOL GetImageInfo(TW_IMAGEINFO& info); 
 
	virtual BOOL DisableSource(); 
	virtual BOOL CanClose()  { return TRUE; }; 
 
	void TranslateMessage(TW_EVENT& twEvent); 
	void TransferImage(); 
	BOOL EndTransfer(); 
	void CancelTransfer(); 
	BOOL ShouldContinue(); 
	BOOL GetImage(TW_IMAGEINFO& info); 
 
	virtual void CopyImage(HANDLE hBitmap,TW_IMAGEINFO& info)=0; 
 
protected: 
	HINSTANCE m_hTwainDLL; 
	DSMENTRYPROC m_pDSMProc; 
 
	TW_IDENTITY m_AppId; 
	TW_IDENTITY m_Source; 
	TW_STATUS m_Status; 
	TW_INT16  m_returnCode; 
	HWND m_hMessageWnd; 
 
	BOOL m_bSourceSelected; 
	BOOL m_bDSMOpen; 
	BOOL m_bDSOpen; 
	BOOL m_bSourceEnabled; 
	BOOL m_bModalUI; 
 
	int m_nImageCount; 
}; 
 
 
#endif