C++读取Shp文件并将Shp转化为DXF

1 代码示例

#include<stdio.h>
#include<math.h>
#include<stdlib.h>
#include<string.h>
void show(char aa[])
{
    int i;
    for(i=0;i<8;i++)
        printf("%c",aa[i]);
    printf("\n");
}
void sh_handle()
{

}
int OnChangeByteOrder(int indata)
{
    char ss[9];
    char ee[8];
    unsigned long val=unsigned long(indata);
    ultoa(val,ss,16);// 将十六进制的数(val)转到一个字符串(ss)中,itoa(val,ss,16);
    int i;
    int length=strlen(ss);
    if(length!=8)
    {
        for(i=0;i<8-length;i++)
            ee[i]='0';
        for(i=0;i<length;i++)
            ee[i+8-length]=ss[i];
        for(i=0;i<8;i++)
            ss[i]=ee[i];
    }
    ////****** 进行倒序
    int t;
    t=ss[0];ss[0]=ss[6];ss[6]=t;
    t=ss[1];ss[1]=ss[7];ss[7]=t;
    t=ss[2];ss[2]=ss[4];ss[4]=t;
    t=ss[3];ss[3]=ss[5];ss[5]=t;
    ////******
    //****** 将存有十六进制数 (val) 的字符串 (ss) 中的十六进制数转成十进制数
    int value=0;
    for(i=0;i<8;i++)
    {
        int k;
        if(ss[i]=='a'||ss[i]=='b'||ss[i]=='c'||ss[i]=='d'||ss[i]=='e'||ss[i]=='f')
            k=10+ss[i]-'a';
        else
            k=ss[i]-'0';
        //printf("k=%d\n",k);
        value=value+int(k*pow(16,7-i));
    }
    //printf("value=%d\n",value);
    return(value);
}
void OnWriteLineShp(FILE * ShpFile_fp)
{

}
void OnReadLineShp(FILE * ShpFile_fp)
{
    // 读取线状目标的实体信息
    FILE * fp;
    if((fp=fopen("F:\\学习\\C++实验\\武汉shp\\桥梁_polyline.dxf","w"))==NULL)  //新建一个dxf文件  
    {
        exit(0);
    }
//------------------------------------------------------
    //写入dxf文件中,在新建的dxf中写入下列内容
    fprintf(fp,"0\nSECTION\n");//fprintf( FILE *stream, const char *format, [ argument ]...)，fprintf()函数根据指定的格式(format)向输出流(stream)写入数据(argument)
    fprintf(fp,"2\nENTITIES\n");//fprintf( FILE *stream, const char *format, [ argument ]...)，fprintf()函数根据指定的格式(format)向输出流(stream)写入数据(argument)
//------------------------------------------------------
    int i,j;
    int RecordNumber;
    int ContentLength;
    int num=0;
    while((fread(&RecordNumber,sizeof(int),1,ShpFile_fp)!=0))//从ShpFile_fp中以int型字节的长度，读取一次，并将其读取到RecordNumber中
    {   
        //printf("转换前RecordNumber=%d\n",RecordNumber);
        RecordNumber=OnChangeByteOrder(RecordNumber);//对RecordNumber进行转化后打印输出
        printf("\n\nRecordNumber=%d\n",RecordNumber);
        //fprintf(fp,"\n\nRecordNumber=%d\n",RecordNumber);

        fread(&ContentLength,sizeof(int),1,ShpFile_fp);//从ShpFile_fp中以int型字节的长度，读取一次，并将其读取到ContentLength中
        //printf("转换前ContentLength=%d\n",ContentLength);
        ContentLength=OnChangeByteOrder(ContentLength);//对其进行转化 并输出
        printf("ContentLength=%d\n",ContentLength);
        //fprintf(fp,"ContentLength=%d\n",ContentLength);

        int shapeType;
        double Box[4];
        int NumParts;
        int NumPoints;
        int *Parts;

        fread(&shapeType,sizeof(int),1,ShpFile_fp);//从ShpFile_fp中以int型字节的长度，读取一次，并将其读取到ContentLength中
        printf("shapeType=%d\n",shapeType);//打印输出
        //fprintf(fp,"shapeType=%d\n",shapeType);

        for(i=0;i<4;i++)
        {
            fread(Box+i,sizeof(double),1,ShpFile_fp); // 读 Box
            printf("Box+%d=%lf\n",i,*(Box+i));
        }
        fread(&NumParts,sizeof(int),1,ShpFile_fp);// 读 NumParts 
        printf("NumParts=%d\n",NumParts);
        //fprintf(fp,"NumParts=%d\n",NumParts);

        fread(&NumPoints,sizeof(int),1,ShpFile_fp);// 读NumPoints
        printf("NumPoints=%d\n",NumPoints);
        //fprintf(fp,"NumPoints=%d\n",NumPoints);

        Parts=new int[NumParts];
        for(i=0;i<NumParts;i++)
        {
            fread(Parts+i,sizeof(int),1,ShpFile_fp);
            printf("Parts+%d=%d\n",i,*(Parts+i));
        }

        int pointNum;
        for(i=0;i<NumParts;i++)
        {
            if(i!=NumParts-1)
                pointNum = Parts[i+1]-Parts[i];
            else
                pointNum = NumPoints-Parts[i];
            double *PointsX;
            double *PointsY;
            PointsX =new double[pointNum];
            PointsY =new double[pointNum];
            //读取坐标点
            //------------------------------------------------------
            fprintf(fp,"0\nPOLYLINE\n");在新建的dxf文件中写入信息
            fprintf(fp,"8\n0\n");
            fprintf(fp,"66\n1\n");
            //------------------------------------------------------
            for(j=0;j<pointNum;j++)
            {
                                fread(PointsX+j, sizeof(double),1,ShpFile_fp);//读取点的X坐标
                fread(PointsY+j, sizeof(double),1,ShpFile_fp);//读取点的Y坐标
                printf("X[%d]=%lf\n",j,*(PointsX+j));//打印输出点的X坐标
                printf("Y[%d]=%lf\n",j,*(PointsY+j));//打印输出点的Y坐标
                //fprintf(fp,"X[%d]=%lf\n",j,*(PointsX+j));
                //fprintf(fp,"Y[%d]=%lf\n",j,*(PointsY+j));
                //------------------------------------------------------
                fprintf(fp,"0\nVERTEX\n");//写入VERTEX
                fprintf(fp,"8\n0\n");
                fprintf(fp,"10\n%.9lf\n",*(PointsX+j));//写入点X坐标
                fprintf(fp,"20\n%.9lf\n",*(PointsY+j));//写入点Y坐标
                //------------------------------------------------------
            }
//------------------------------------------------------
            //写入dxf文件中
            fprintf(fp,"0 \nSEQEND\n");
            fprintf(fp,"8 \n0\n");
//------------------------------------------------------
            delete[] PointsX;
            delete[] PointsY;
        }
        delete[] Parts;
    }
//------------------------------------------------------
    fprintf(fp,"0 \nENDSEC\n");
    fprintf(fp,"0 \nEOF");
    fclose(fp);
//------------------------------------------------------
}
void main()
{
//----------------------------------------------------------------
    // 打开坐标文件
    FILE * m_ShpFile_fp;
    if((m_ShpFile_fp=fopen("F:\\学习\\C++实验\\武汉shp\\桥梁_polyline.shp","rb"))==NULL)    
    {
        exit(0);
    }
//----------------------------------------------------------------
    // 读取坐标文件头的内容开始
    int fileCode =-1;
        int fileLength=-1;
    int version=-1;
    int shapeType=-1;

    int i;
    int FileCode;
    int Unused;
    int FileLength;
    int Version;
    int ShapeType;
    double Xmin;
    double Ymin;
    double Xmax;
    double Ymax;
    double Zmin;
    double Zmax;
    double Mmin;
    double Mmax;

    fread(&FileCode,sizeof(int),1,m_ShpFile_fp);//从m_ShpFile_fp里面的值读到Filecode里面去，每次读一个int型字节的长度，读取一次
    printf("FileCode=%d\n",FileCode);//在屏幕上打印FileCode的值
    FileCode = OnChangeByteOrder(FileCode);//将读取的FileCode的值转化为十进制的数
    printf("FileCode=%d\n",FileCode);//打印转化后的十进制的FileCode的值

    for(i=0;i<5;i++)
        fread(&Unused,sizeof(int),1,m_ShpFile_fp);

    fread(&FileLength,sizeof(int),1,m_ShpFile_fp);//读取FileLength
    FileLength=OnChangeByteOrder(FileLength);//将FileLength转化为十进制的数
    printf("FileLength=%d\n",FileLength);//在屏幕上打印输出

    fread(&Version,sizeof(int),1,m_ShpFile_fp);//读取Version的值
    printf("Version=%d\n",Version);//在屏幕上打印输出

    fread(&ShapeType,sizeof(int),1,m_ShpFile_fp);//读取ShapeType的值
    printf("ShapeType=%d\n",ShapeType);//在屏幕上打印输出ShapeType的值

    fread(&Xmin,         sizeof(double),1,m_ShpFile_fp);//从m_ShpFile_fp里面的值读到Xmin里面去，每次读取一个double型字节长度，读取一次
    printf("Xmin=%lf\n",Xmin);//在屏幕上打印输出Xmin的值

    fread(&Ymin,         sizeof(double),1,m_ShpFile_fp);//从m_ShpFile_fp里面的值读到Ymin里面去，每次读取一个double型字节长度，读取一次
    printf("Ymin=%lf\n",Ymin);//在屏幕上打印输出

    fread(&Xmax,         sizeof(double),1,m_ShpFile_fp);//从m_ShpFile_fp里面的值读到Xmax里面去，每次读取一个double型字节长度，读取一次
    printf("Xmax=%lf\n",Xmax);//在屏幕上打印输出

    fread(&Ymax,         sizeof(double),1,m_ShpFile_fp);//从m_ShpFile_fp里面的值读到Ymax里面去，每次读取一个double型字节长度，读取一次
    printf("Ymax=%lf\n",Ymax);//在屏幕上打印输出

    fread(&Zmin,         sizeof(double),1,m_ShpFile_fp);//从m_ShpFile_fp里面的值读到Zmin里面去，每次读取一个double型字节长度，读取一次
    printf("Zmin=%lf\n",Zmin);//在屏幕上打印输出

    fread(&Zmax,        sizeof(double),1,m_ShpFile_fp);//从m_ShpFile_fp里面的值读到Zmax里面去，每次读取一个double型字节长度，读取一次
    printf("Zmax=%lf\n",Zmax);//在屏幕上打印输出

    fread(&Mmin,         sizeof(double),1,m_ShpFile_fp);//从m_ShpFile_fp里面的值读到Mmin里面去，每次读取一个double型字节长度，读取一次
    printf("Mmin=%lf\n",Mmin);//在屏幕上打印输出

    fread(&Mmax,         sizeof(double),1,m_ShpFile_fp);//从m_ShpFile_fp里面的值读到Mmax里面去，每次读取一个double型字节长度，读取一次
    printf("Mmax=%lf\n",Mmax);//在屏幕上打印输出
    // 读取坐标文件头的内容结束
//----------------------------------------------------------------
    OnReadLineShp(m_ShpFile_fp);
    //getchar();
}