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   源码介绍

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using System;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace CTOCR
{
    public partial class MainForm : Form
    {
        public MainForm()
        {
            InitializeComponent();
        }

        private abstract class NativeMethod
        {
            [DllImport("AspriseOCR.dll", EntryPoint = "OCR", CallingConvention = CallingConvention.Cdecl)]
            public static extern IntPtr OCR(string file, int type);

            [DllImport("AspriseOCR.dll", EntryPoint = "OCRpart", CallingConvention = CallingConvention.Cdecl)]
            public static extern IntPtr OCRpart(string file, int type, int startX, int startY, int width, int height);

            [DllImport("AspriseOCR.dll", EntryPoint = "OCRBarCodes", CallingConvention = CallingConvention.Cdecl)]
            public static extern IntPtr OCRBarCodes(string file, int type);

            [DllImport("AspriseOCR.dll", EntryPoint = "OCRpartBarCodes", CallingConvention = CallingConvention.Cdecl)]
            public static extern IntPtr OCRpartBarCodes(string file, int type, int startX, int startY, int width, int height);

            public static readonly IntPtr NULL = IntPtr.Zero;
        }

        private void btnOcrFile_Click(object sender, EventArgs e)
        {
            if (ofdlgOcr.ShowDialog() == DialogResult.OK)
            {
                IntPtr pstrOcrValue = NativeMethod.OCR(txtFileName
                    .Text = ofdlgOcr.FileName, 0);
                txtOcrValue.Text = (pstrOcrValue == NativeMethod.NULL) ? 
                    string.Empty : Marshal.PtrToStringAnsi(pstrOcrValue);
            }
        }
    }
}