HGScannerLib增加判断是否有纸的接口

build/windows/HGScannerLib/HGScannerLib.def

@@ -17,5 +17,6 @@ HGLib_GetDeviceParam
 HGLib_ReleaseDeviceParamGroupList
 HGLib_ReleaseDeviceParam
 HGLib_ResetDeviceParam
+HGLib_DeviceIsPaperOn
 HGLib_StartDeviceScan
 HGLib_StopDeviceScan

sdk/scannerlib/HGLibDeviceImpl.cpp

@@ -870,6 +870,16 @@ HGBool HGLibDeviceImpl::ResetParam()
 	return ret;
 }
 
+HGBool HGLibDeviceImpl::IsPaperOn()
+{
+	SANE_Bool isOn = SANE_FALSE;
+	unsigned int len = sizeof(SANE_Bool);
+	SANE_Status status = sane_io_control(m_devHandle, IO_CTRL_CODE_GET_PAPER_ON, &isOn, &len);
+	if (SANE_STATUS_GOOD == status && isOn)
+		return HGTRUE;
+	return HGFALSE;
+}
+
 HGBool HGLibDeviceImpl::StartScan(HGLibDeviceScanEventFunc eventFunc, HGPointer eventParam,
 	HGLibDeviceScanImageFunc imageFunc, HGPointer imageParam)
 {

sdk/scannerlib/HGLibDeviceImpl.hpp

@@ -29,6 +29,7 @@ public:
 	static HGBool ReleaseParamGroupList(HGLibDeviceParamGroup* paramGroup, HGUInt count);
 	static HGBool ReleaseParam(HGLibDeviceParam* param);
 	HGBool ResetParam();
+	HGBool IsPaperOn();
 	HGBool StartScan(HGLibDeviceScanEventFunc eventFunc, HGPointer eventParam,
 		HGLibDeviceScanImageFunc imageFunc, HGPointer imageParam);
 	HGBool StopScan();

sdk/scannerlib/HGScannerLib.cpp

@@ -183,6 +183,17 @@ HGBool HGAPI HGLib_ResetDeviceParam(HGLibDevice device)
 	return deviceImpl->ResetParam();
 }
 
+HGBool HGAPI HGLib_DeviceIsPaperOn(HGLibDevice device)
+{
+	if (NULL == device)
+	{
+		return HGFALSE;
+	}
+
+	HGLibDeviceImpl* deviceImpl = (HGLibDeviceImpl*)device;
+	return deviceImpl->IsPaperOn();
+}
+
 HGBool HGAPI HGLib_StartDeviceScan(HGLibDevice device, HGLibDeviceScanEventFunc eventFunc, HGPointer eventParam,
 	HGLibDeviceScanImageFunc imageFunc, HGPointer imageParam)
 {

sdk/scannerlib/HGScannerLib.h

@@ -460,6 +460,9 @@ HGEXPORT HGBool HGAPI HGLib_ReleaseDeviceParam(HGLibDeviceParam* param);
 /* 重置设备参数 */
 HGEXPORT HGBool HGAPI HGLib_ResetDeviceParam(HGLibDevice device);
 
+/* 设备是否有纸 */
+HGEXPORT HGBool HGAPI HGLib_DeviceIsPaperOn(HGLibDevice device);
+
 /* 开始扫描 */
 HGEXPORT HGBool HGAPI HGLib_StartDeviceScan(HGLibDevice device, HGLibDeviceScanEventFunc eventFunc, HGPointer eventParam,
 	HGLibDeviceScanImageFunc imageFunc, HGPointer imageParam);