C#，读取shp源文件 ，将要素生成JSON格式(面图层)
//转换位字节 大小位转换
private int ChangeByteOrder(int indata)
{
byte[] src = new byte[4];
src[0] = (byte)((indata >> 24) & 0xFF);
src[1] = (byte)((indata >> 16) & 0xFF);
src[2] = (byte)((indata >> 8) & 0xFF);
src[3] = (byte)(indata & 0xFF);
int value;
value = (int)((src[0] & 0xFF) | ((src[1] & 0xFF) << 8) | ((src[2] & 0xFF) << 16) | ((src[3] & 0xFF) << 24));
return value;
}
int ShapeType;//shp文件类型，点1 线3 面5
double[] fileBox = new double[4];
string[] nameArr = { "name1镇", "name2镇", "name3镇"};
List
List
StringBuilder sb = new StringBuilder("[");
private void read()
{
fileBox[0] = double.MaxValue;
fileBox[1] = double.MaxValue;
fileBox[2] = double.MinValue;
fileBox[3] = double.MinValue;
//sb.Append("\r\n");
//sb.Append("]");
//writeTxt(sb.ToString());
//return;
string shpfilepath = @"F:\test\shp\test.shp";
FileStream fs = new FileStream(shpfilepath, FileMode.Open, FileAccess.Read);
BinaryReader br = new BinaryReader(fs);
//Console.WriteLine("开始读取面文件...");
//读取文件过程
br.ReadBytes(24);
int FileLength = br.ReadInt32();
//Console.WriteLine("文件长度:" + ChangeByteOrder(FileLength));
int FileBanben = br.ReadInt32();
//Console.WriteLine("版本号:" + FileBanben);
ShapeType = br.ReadInt32();
//Console.WriteLine("几何类型:" + ShapeType);
fileBox[0] = br.ReadDouble();
//Console.WriteLine("空间数据所占空间范围的X方向最小值:" + fileBox[0]);
fileBox[1] = br.ReadDouble();
//Console.WriteLine("空间数据所占空间范围的Y方向最小值:" + fileBox[1]);
fileBox[2] = br.ReadDouble();
//Console.WriteLine("空间数据所占空间范围的X方向最大值:" + fileBox[2]);
fileBox[3] = br.ReadDouble();
//Console.WriteLine("空间数据所占空间范围的Y方向最大值:" + fileBox[3]);
br.ReadBytes(32);
switch (ShapeType)
{
case 5:
while (br.PeekChar() != -1)
{
uint RecordNum = br.ReadUInt32();
int index = ChangeByteOrder((int)RecordNum);
//Console.WriteLine("文件记录号为:" + index);
int DataLength = br.ReadInt32();
//Console.WriteLine("坐标长度为:" + ChangeByteOrder(DataLength));
//读取第i个记录
int m = br.ReadInt32();
//Console.WriteLine("几何类型:" + m);
for (int i = 0; i < 4; i++)
{
br.ReadDouble();
//Console.WriteLine("Box[" + i + "]:" + br.ReadDouble());
}
int numParts = br.ReadInt32();
//Console.WriteLine("子面个数:" + numParts);
int numPoints = br.ReadInt32();
//Console.WriteLine("坐标点个数:" + numPoints);
//Console.WriteLine("每个子环在坐标点内的起始位置:");
for (int j = 0; j < numParts; j++)
{
int parts = new int();
parts = br.ReadInt32();
partsArr.Add(parts);
//Console.WriteLine("parts[" + j + "]:" + parts);
}
//Console.WriteLine("Points数组:");
for (int j = 0; j < numPoints; j++)
{
double X = br.ReadDouble();
double Y = br.ReadDouble();
coorsArr.Add(X);
coorsArr.Add(Y);
//Console.WriteLine("Points[" + j + "]:" + X + " " + Y);
//Console.Write("{\"X\":" + X + ",\"Y\":" + Y + "},");
}
for (int i=0;i
sb.Append("\r\n{");
sb.Append("\"Name\":\""+nameArr[index-1]+"\",\r\n");
sb.Append("\"Value\":0,\r\n");
sb.Append("\"PointCollection\":\r\n[");
int startIndex = partsArr[i];
startIndex = startIndex * 2;
int endIndex = partsArr[partsArr.Count-1];
string coorJson = "";
if (i== partsArr.Count - 1)//最后一个走这里
{
while (startIndex < coorsArr.Count)
{
coorJson += "{\"X\":" + coorsArr[startIndex++] + ",\"Y\":" + coorsArr[startIndex++] + "},";
//sb.Append();
}
}
else {
while (startIndex< partsArr[i+1]*2)
{
coorJson += "{\"X\":" + coorsArr[startIndex++] + ",\"Y\":" + coorsArr[startIndex++] + "},";
//sb.Append();
}
}
coorJson = coorJson.Substring(0,coorJson.Length-1);
sb.Append(coorJson);
sb.Append("]\r\n},\r\n");
//string jstring = "";
//jstring += "\r\n{";
//jstring += "\"Name\":\"" + nameArr[index] + "\",\r\n";
//jstring += "\"Value\":0,\r\n";
//jstring += "\"PointCollection\":\r\n[";
}
partsArr.Clear();
coorsArr.Clear();
//Console.WriteLine();
//Console.WriteLine("--------------------------");
}
break;
default:
Console.WriteLine("shp文件必须为面类型，且不带Z、M值");
break;
}
sb.Append("]");
writeTxt(sb.ToString());
fs.Flush();
fs.Close();
}
private bool writeTxt(string s)
{
try {
FileStream fs = new FileStream("C:\\json.txt",FileMode.Create);
byte[] data = System.Text.Encoding.Default.GetBytes(s);
fs.Write(data,0,data.Length);
fs.Flush();
fs.Close();
return true;
}
catch {
return false;
}
}
以上是读取shp面图层转换成json字符串的代码。读取点和线文件类似。参照我之前的博客( C#不用ArcEngine生成shp文件 ) ，把代码改成点或者面的，就可以了
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