【041】通过调入txt的点数据来创建shp

参考：http://bbs.esrichina-bj.cn/ESRI/viewthread.php?tid=46367

调用的文本文件数据：

程序的实现：

第一步：全局变量！

/// <summary>
/// 要保存的ShapeFile全路径名称
/// </summary>
string shapeFileFullName = string.Empty;
/// <summary>
/// 测量数据全路径名称
/// </summary>
string surveyDataFullName = string.Empty;
List<string> pColumns = new List<string>();
List<CPoint> pCPointList = new List<CPoint>();
struct CPoint
{
    public double x;
    public double y;
    public string name;
}

第二步：打开按钮的事件！

private void OpenBtn_Click(object sender, EventArgs e)
{
    OpenFileDialog pOFD = new OpenFileDialog();
    pOFD.Multiselect = false;
    pOFD.Title = "打开本地测量坐标文件";
    pOFD.InitialDirectory = System.IO.Directory.GetCurrentDirectory();
    pOFD.Filter = "测量坐标文件(*.TXT)|*.TXT";
    if (pOFD.ShowDialog() == DialogResult.OK)
    {
        surveyDataFullName = pOFD.FileName;
        this.textBox1.Text = surveyDataFullName;
    }
}

第三步：保存按钮事件！

private void SaveBtn_Click(object sender, EventArgs e)
{
    SaveFileDialog saveFileDialog = new SaveFileDialog();
    saveFileDialog.Filter = "Shape文件(*.shp) |*.shp";
    DialogResult dialogResult = saveFileDialog.ShowDialog();
    if (dialogResult == DialogResult.OK)
    {
        shapeFileFullName = saveFileDialog.FileName;
    }
    else
    {
        shapeFileFullName = null;
        return;
    }
    this.textBox2.Text = shapeFileFullName;
}

第四步：实现的函数一：获取文本文件中的点！

/// <summary>
/// 获取点数据
/// </summary>
/// <param name="surveyDataFullName">测量数据全路径名称</param>
/// <returns></returns>
private List<CPoint> GetAllPoint(string surveyDataFullName)
{
    try
    {
        List<CPoint> pList = new List<CPoint>();
        if (surveyDataFullName == null || surveyDataFullName == string.Empty)
        {
            MessageBox.Show("选择野外测量数据");
            return null;
        }
        if (!System.IO.File.Exists(surveyDataFullName))
        {
            MessageBox.Show("野外测量数据不存在！");
            return null;
        }
        string strLine;                         //获取一行的字符串
        char[] charArray = new char[] { ',' };  //分隔符
        string[] strArray;                      //获取被分割的字符串数组
        System.IO.FileStream aFile = new System.IO.FileStream(surveyDataFullName, FileMo

        StreamReader sr = new StreamReader(aFile, Encoding.Default);
        strLine = sr.ReadLine();                //获取第一行的字符串
        strArray = strLine.Split(charArray);    //将字符串分割
        if (strArray.Length > 0)
        {
            for (int x = 0; x < strArray.Length; x++)
            {
                pColumns.Add(strArray[x]);      //将字符串数组中的内容复制给 列List
            }
        }
        else
        {
            return null;
        }
        strLine = sr.ReadLine();                //继续读第二行字符串
        while (strLine != null)
        {
            strArray = strLine.Split(charArray);        //赋值到字符串数组中
            CPoint pCPoint = new CPoint();              //定义 点
            pCPoint.x = Convert.ToDouble(strArray[0]);  //获取点的横坐标
            pCPoint.y = Convert.ToDouble(strArray[1]);  //获取点的纵坐标
            pCPoint.name = strArray[2].Trim();          //获取点的名称
            pList.Add(pCPoint);                         //将点加到 点List 中
            strLine = sr.ReadLine();                    //继续读下一行
        }
        sr.Close();
        return pList;               //将 点List 返回了
    }
    catch (Exception Err)
    {
        MessageBox.Show(Err.Message);
        return null;
    }
}

第五步：实现的函数二：创建 shp 文件！

/// <summary>
/// 创建Shp文件
/// </summary>
/// <param name="saveFile"></param>
/// <returns></returns>
private IFeatureLayer CreateShpFromPoints(string outfileNamePath)
{
    int index = outfileNamePath.LastIndexOf('\\');
    string folder = outfileNamePath.Substring(0, index);            //获取shp文件夹
    shapeFileFullName = outfileNamePath.Substring(index + 1);       //获取shp文件名

    IWorkspaceFactory pWSF = new ShapefileWorkspaceFactoryClass();
    IFeatureWorkspace pFWS = pWSF.OpenFromFile(folder, 0) as IFeatureWorkspace;

    //如果shapefile存在替换它
    if (File.Exists(outfileNamePath))
    {
        IFeatureClass featureClass = pFWS.OpenFeatureClass(shapeFileFullName);
        IDataset pDataset = (IDataset)featureClass;
        pDataset.Delete();                           //将里面数据删除
    }

    IFields pFields = new FieldsClass();
    IFieldsEdit pFieldsEdit;
    pFieldsEdit = (IFieldsEdit)pFields;

    IField pField = new FieldClass();
    IFieldEdit pFieldEdit = (IFieldEdit)pField;
    pFieldEdit.Name_2 = "Shape";
    pFieldEdit.Type_2 = esriFieldType.esriFieldTypeGeometry;
    IGeometryDef pGeometryDef = new GeometryDefClass();
    IGeometryDefEdit pGDefEdit = (IGeometryDefEdit)pGeometryDef;
    pGDefEdit.GeometryType_2 = esriGeometryType.esriGeometryPolygon;
    pFieldEdit.GeometryDef_2 = pGeometryDef;
    pFieldsEdit.AddField(pField);

    pField = new FieldClass();
    pFieldEdit = (IFieldEdit)pField;
    pFieldEdit.Length_2 = 20;
    pFieldEdit.Name_2 = pColumns[2];
    pFieldEdit.Type_2 = esriFieldType.esriFieldTypeString;
    pFieldsEdit.AddField(pField);
    IFeatureClass pFeatureClass;

    pFeatureClass = pFWS.CreateFeatureClass(shapeFileFullName, pFields, null, null, esriFeatureType.esriFTSimple, "Shape", "");

    List<string> pBuildingList = new List<string>();
    for (int i = 0; i < pCPointList.Count; i++)
    {
        if (pBuildingList.Contains(pCPointList[i].name.Trim()) == false)
        {
            pBuildingList.Add(pCPointList[i].name.Trim());  //将不一样的名字加了进来
        }
    }
    for (int i = 0; i < pBuildingList.Count; i++)   //遍历不同的名字
    {
        IPointCollection pPointColl = new PolygonClass();
        object o = Type.Missing;
        for (int j = 0; j < pCPointList.Count; j++)
        {
            if (pCPointList[j].name.Trim() == pBuildingList[i].Trim())
            {
                IPoint pPoint = new PointClass();
                pPoint.X = pCPointList[j].x;
                pPoint.Y = pCPointList[j].y;
                pPointColl.AddPoint(pPoint, ref o, ref o);  //相同的名字添加到同一个多边形中
            }
        }
        if (pPointColl.PointCount > 0)
        {
            IClone pClone = pPointColl.get_Point(0) as IClone;
            IPoint pEndPoint = pClone.Clone() as IPoint;        //将第一个点拷贝到最后一个点
            pPointColl.AddPoint(pEndPoint, ref o, ref o);
        }
        IFeature pFeature = pFeatureClass.CreateFeature();
        pFeature.Shape = pPointColl as IPolygon;
        pFeature.Store();
        pFeature.set_Value(pFeature.Fields.FindField(pColumns[2]), pBuildingList[i].Trim());
        pFeature.Store();
    }
    IFeatureLayer pFeaturelayer = new FeatureLayerClass();
    pFeaturelayer.FeatureClass = pFeatureClass;
    return pFeaturelayer;
}

第六步：创建按钮事件！

private void CreateBtn_Click_1(object sender, EventArgs e)
{
    pCPointList = this.GetAllPoint(surveyDataFullName);　　//调用函数
    IFeatureLayer pFeatureLayer = CreateShpFromPoints(shapeFileFullName);　　//调用函数
    pFeatureLayer.Name = "建筑物";
    this.axMapControl1.Map.AddLayer(pFeatureLayer);
}