public QuickDBF(string FileName, DataTable DTStruct)
{
strFileName = FileName;
//根据数据结构信息创建数据结构组
DictColomns.Clear();
Int32 offset = 1;
for (int i = 0; i < DTStruct.Rows.Count; i++)
{
DBFColumnInfo colInfo = new DBFColumnInfo();
colInfo.ColName = (string)DTStruct.Rows[i]["FIELD_NAME"];
colInfo.colType = 'C'; //目前中国结算实时接口所有字段均为字符型，暂时不做处理
colInfo.colLength = byte.Parse((string)DTStruct.Rows[i]["FIELD_LENGTH"]);
colInfo.colOffset = offset; //第一个字段偏移从1开始 偏移0为记录删除标志
offset = offset + colInfo.colLength; //累加计算下一个字段的偏移,最后一次执行完以后该值就是记录长度
DictColomns.Add(colInfo.ColName, colInfo);
}
DBFh.FileType = 0x03;
DBFh.LastModDate = new byte[3];
DBFh.LastModDate[0] = (byte)(DateTime.Now.Year - 2000); //最后修改日期三个字段分别放年月日，其中年只放后两位，嗯哼，千年虫问题。
DBFh.LastModDate[1] = (byte)(DateTime.Now.Month);
DBFh.LastModDate[2] = (byte)(DateTime.Now.Day);
DBFh.RowCount = 0; //初始化的时候暂不知数据量
DBFh.HeadLength = (short)((DictColomns.Count + 1) * 32 + 1); //头的长度=头信息32字节+ 每个字段32字节 + 一个字节的结束标志
DBFh.RowLength = (short)offset;
}
/// <summary>
/// 获取DBF文件格式
/// </summary>
/// <returns></returns>
private void GetDBFStru()
{
try
{
//开启文件
FileStream Reader = new FileStream(strFileName, FileMode.Open, FileAccess.Read, FileShare.ReadWrite); //
//获取DBF文件头
Byte[] ReadBuffer = new Byte[32];
Reader.Read(ReadBuffer, 0, ReadBuffer.Length); //读取前32个字节文件头部
object DBFhType = DBFh; //装箱处理，将结构体变成引用类型
ByteArrayToStructure(ReadBuffer, ref DBFhType, 0);
DBFh = (DBFHead)DBFhType; //拆箱
//获取DBF文件字段集合
DBFColumnInfo DBFc = new DBFColumnInfo();
long ColumnCount = (DBFh.HeadLength - 1 - 32) / 32; //DBF字段数等于头总长减去1（头部结束标志符 0x0D）再减去DBF信息数据块的32个字节，然后每个字段信息32个字节
DictColomns.Clear(); //清空
for (int i = 0; i < ColumnCount; i++)
{
Reader.Read(ReadBuffer, 0, ReadBuffer.Length); //逐个读取字段信息
DBFhType = DBFc; //装箱
ByteArrayToStructure(ReadBuffer, ref DBFhType, 0);
DBFc = (DBFColumnInfo)DBFhType; //拆箱
DictColomns.Add(DBFc.ColName, DBFc);
}
Reader.Close();
}
catch (Exception ex)
{
Log.writelog(ex.Message);
MessageBox.Show("DBF文件处理错误" + ex.Message);
}
}
