DeviceWrapper.cs

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using System;
using System.Text;
using System.IO;
using System.Runtime.InteropServices;

public enum ENUM_LIBWFX_ERRCODE
{
 LIBWFX_ERRCODE_SUCCESS = 0, 
 LIBWFX_ERRCODE_FAIL, 
 LIBWFX_ERRCODE_NO_INIT, 
 LIBWFX_ERRCODE_NO_RECOGNIZE_TOOL, 
 LIBWFX_ERRCODE_NO_DEVICES, 
 LIBWFX_ERRCODE_FORMAT_ERROR, 
 LIBWFX_ERRCODE_NO_DEVICE_NAME, 
 LIBWFX_ERRCODE_NO_SOURCE, 
 LIBWFX_ERRCODE_FILE_NO_EXIST, 
 LIBWFX_ERRCODE_PAPER_NOT_READY, 
 LIBWFX_ERRCODE_INVALID_SERIALNUM, 
}

public enum ENUM_LIBWFX_EVENT_CODE
{
 LIBWFX_EVENT_PAPER_DETECTED = 0, 
 LIBWFX_EVENT_NO_PAPER, 
 LIBWFX_EVENT_PAPER_JAM, 
 LIBWFX_EVENT_MULTIFEED, 
 LIBWFX_EVENT_NO_CALIBRATION_DATA, 
 LIBWFX_EVENT_WARMUP_COUNTDOWN, 
}

public enum ENUM_LIBWFX_EXCEPTION_CODE
{
 LIBWFX_EXC_OTHER = 0, 
 LIBWFX_EXC_TIFF_SAVE_FINSIHED, 
 LIBWFX_EXC_PDF_SAVE_FINSIHED, 
};

public enum ENUM_LIBWFX_NOTIFY_CODE
{
 LIBWFX_NOTIFY_IMAGE_DONE = 0, 
 LIBWFX_NOTIFY_END, 
 LIBWFX_NOTIFY_EXCEPTION, 
}

[StructLayout(LayoutKind.Sequential)]
class DeviceWrapper
{
 public const String LIBWFX_DLLNAME = @"LibWebFXScan.dll";

 [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
 public delegate void LIBWFXEVENTCB(ENUM_LIBWFX_EVENT_CODE enEventCode, int nParam, IntPtr pUserDef);

 [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
 public delegate void LIBWFXCB(ENUM_LIBWFX_NOTIFY_CODE enNotifyCode, IntPtr pUserDef, IntPtr pParam1, IntPtr pParam2);

 [DllImport(LIBWFX_DLLNAME, EntryPoint = "LibWFX_Init", CallingConvention = CallingConvention.StdCall)]
 public static extern ENUM_LIBWFX_ERRCODE LibWFX_Init();

 [DllImport(LIBWFX_DLLNAME, EntryPoint = "LibWFX_DeInit", CallingConvention = CallingConvention.StdCall)]
 public static extern ENUM_LIBWFX_ERRCODE LibWFX_DeInit();

 [DllImport(LIBWFX_DLLNAME, EntryPoint = "LibWFX_GetDeviesList", CallingConvention = CallingConvention.StdCall)]
 public static extern ENUM_LIBWFX_ERRCODE LibWFX_GetDeviesList(out IntPtr szDevicesListOut);

 [DllImport(LIBWFX_DLLNAME, EntryPoint = "LibWFX_GetFileList", CallingConvention = CallingConvention.StdCall)]
 public static extern ENUM_LIBWFX_ERRCODE LibWFX_GetFileList(out IntPtr szFileListOut);

 [DllImport(LIBWFX_DLLNAME, EntryPoint = "LibWFX_RemoveFile", CallingConvention = CallingConvention.StdCall)]
 public static extern ENUM_LIBWFX_ERRCODE LibWFX_RemoveFile(String szFileNameIn);

 [DllImport(LIBWFX_DLLNAME, EntryPoint = "LibWFX_SetProperty", CallingConvention = CallingConvention.StdCall)]
 public static extern ENUM_LIBWFX_ERRCODE LibWFX_SetProperty(String szRequestCmdIn, [MarshalAs(UnmanagedType.FunctionPtr)] LIBWFXEVENTCB pfnLibWFXEVENTCBIn, IntPtr pUserDefIn);

 [DllImport(LIBWFX_DLLNAME, EntryPoint = "LibWFX_StartScan", CallingConvention = CallingConvention.StdCall)]
 public static extern ENUM_LIBWFX_ERRCODE LibWFX_StartScan([MarshalAs(UnmanagedType.FunctionPtr)] LIBWFXCB pfnLibWFXCBIn, IntPtr pUserDefIn);

 [DllImport(LIBWFX_DLLNAME, EntryPoint = "LibWFX_Calibrate", CallingConvention = CallingConvention.StdCall)]
 public static extern ENUM_LIBWFX_ERRCODE LibWFX_Calibrate();

 [DllImport(LIBWFX_DLLNAME, EntryPoint = "LibWFX_ECOControl", CallingConvention = CallingConvention.StdCall)]
 public static extern ENUM_LIBWFX_ERRCODE LibWFX_ECOControl(out uint pulTime, int nSetIn);

 [DllImport(LIBWFX_DLLNAME, EntryPoint = "LibWFX_PaperReady", CallingConvention = CallingConvention.StdCall)]
 public static extern ENUM_LIBWFX_ERRCODE LibWFX_PaperReady();

 [DllImport(LIBWFX_DLLNAME, EntryPoint = "LibWFX_CloseDevice", CallingConvention = CallingConvention.StdCall)]
 public static extern ENUM_LIBWFX_ERRCODE LibWFX_CloseDevice();
}