标签:value 文件头 string ble gets mit format values ESS
该库托管于GitHub,地址:https://github.com/SocialExplorer/FastDBF
贡献者应该都是老外,所以
1、分析文件头字段部分时,如果字段名有中文命名会出错
在DbfHeader类的Read(BinaryReader reader)方法
//char[] buffer = new char[11]; //buffer = reader.ReadChars(11); //string sFieldName = new string(buffer); //yang:ReadChars(11)读取中文字段名时会出错,已改为ReadBytes(11) byte[] bytes = reader.ReadBytes(11); string sFieldName = Encoding.Default.GetString(bytes); int nullPoint = sFieldName.IndexOf((char)0); if (nullPoint != -1) sFieldName = sFieldName.Substring(0, nullPoint);
2、在DbfColumn类,没有设定字段类型可能存在的Float
public enum DbfColumnType { /// <summary> /// Character less than 254 length /// ASCII text less than 254 characters long in dBASE. /// /// Character fields can be up to 32 KB long (in Clipper and FoxPro) using decimal /// count as high byte in field length. It‘s possible to use up to 64KB long fields /// by reading length as unsigned. /// /// </summary> Character = 0, /// <summary> /// Number Length: less than 18 /// ASCII text up till 18 characters long (include sign and decimal point). /// /// Valid characters: /// "0" - "9" and "-". Number fields can be up to 20 characters long in FoxPro and Clipper. /// </summary> /// <remarks> /// We are not enforcing this 18 char limit. /// </remarks> Number = 1, /// <summary> /// L Logical Length: 1 Boolean/byte (8 bit) /// /// Legal values: /// ? Not initialised (default) /// Y,y Yes /// N,n No /// F,f False /// T,t True /// Logical fields are always displayed using T/F/?. Some sources claims /// that space (ASCII 20h) is valid for not initialised. Space may occur, but is not defined. /// </summary> Boolean = 2, /// <summary> /// D Date Length: 8 Date in format YYYYMMDD. A date like 0000-00- 00 is *NOT* valid. /// </summary> Date = 3, /// <summary> /// M Memo Length: 10 Pointer to ASCII text field in memo file 10 digits representing a pointer to a DBT block (default is blanks). /// </summary> Memo = 4, /// <summary> /// B Binary (dBASE V) Like Memo fields, but not for text processing. /// </summary> Binary = 5, /// <summary> /// I Integer Length: 4 byte little endian integer (FoxPro) /// </summary> Integer = 6, /// <summary> ///yang:添加 F Float /// </summary> Float = 7 , }
public char ColumnTypeChar { get { switch(mType) { case DbfColumnType.Number: return ‘N‘; case DbfColumnType.Character: return ‘C‘; case DbfColumnType.Binary: return ‘B‘; case DbfColumnType.Boolean: return ‘L‘; case DbfColumnType.Date: return ‘D‘; case DbfColumnType.Integer: return ‘I‘; case DbfColumnType.Memo: return ‘M‘; //yang:新加Float字段类型 case DbfColumnType.Float: return ‘F‘; } throw new Exception("Unrecognized field type!"); } }
public static DbfColumnType GetDbaseType(char c) { switch(c.ToString().ToUpper()) { case "C": return DbfColumnType.Character; case "N": return DbfColumnType.Number; case "B": return DbfColumnType.Binary; case "L": return DbfColumnType.Boolean; case "D": return DbfColumnType.Date; case "I": return DbfColumnType.Integer; case "M": return DbfColumnType.Memo; //yang:新加Float字段类型 case "F": return DbfColumnType.Number; } throw new NotSupportedException(String.Format("{0} does not have a corresponding dbase type.", c)); }
关于SocialExplorer.IO.FastDBF库读写ArcGis dbf文件的两个小bug
标签:value 文件头 string ble gets mit format values ESS
原文地址:https://www.cnblogs.com/yzhyingcool/p/10591063.html