Unitech PA500 manual Unregister the application from the USI.DLL, Enable / Disable Scanner

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2.2.Unregister the application from the USI.DLL

Function Description: Unregister the application from the DLL. It will close the scanner port, and by default it will disable the scanner.

Function call: void USI_Unregister();

Return code: None

2.3.Enable / Disable Scanner

Function Description: To start or stop USI function. This function is useful for application to temporarily stop scanner function if it is only need keypad input or keep clear input buffer.

Function call: BOOL USI_EnableScan(BOOL bStatus);

Parameter: (input)

bStatus:	TRUE		: Enable Scanner
	FALSE		: Disable Scanner
Return code: BOOL :		TRUE	: OK
		FALSE : Failure

2.4.Reset Scanner

Function Description: Set the scanner to the working mode, and reset the communication control.

Function call:	BOOL USI_Reset();
Return:	Always TRUE

2.5.Get error code

Function Description: Returns the error code (SERR_***).

Function call:	DWORD USI_GetError();
Return:	Returns the error code (SERR_***), which has been described in
	USI_Register function.

2.6.Returns the system error code

Function Description: Returns the system error code, which is returned by GetLastError. It will also return the description of the error in buffer if it is not NULL.

Function call: DWORD USI_GetLastSysError(LPTSTR buffer, int len);

Return:Returns the system error code, which is returned by system function GetLastError. It will also return the description of the error in buffer retrieved by system function FormatMessage if it is not NULL.

For a complete list of error codes, refer to the SDK header file WINERROR.H.

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