void WriteDbf(CString filename)
{//创建与Shp文件同名的指针int n = filename.ReverseFind('.');filename = filename.Left(n);filename = filename + ".dbf";FILE* m_DbfFile_fp;if ((m_DbfFile_fp = fopen(filename, "wb")) == NULL)return;//****创建dbf文件的文件头int i, j;BYTE version = 4;fwrite(&version, 1, 1, m_DbfFile_fp);CTime t = CTime::GetCurrentTime();int d = t.GetDay();int y = t.GetYear() % 2000;int m = t.GetMonth();BYTE date[3];date[0] = y;date[1] = m;date[2] = d;for (i = 0; i<3; i++)                           //记录时间fwrite(date + i, 1, 1, m_DbfFile_fp);int RecordNum = map->layer->objects.size();     //文件中的记录条数fwrite(&RecordNum, sizeof(int), 1, m_DbfFile_fp);short HeaderByteNum = 0;                        //文件头中的字节数，暂时写0，后面要返回来修改fwrite(&HeaderByteNum, sizeof(short), 1, m_DbfFile_fp);short RecordByteNum = 0;                        //一条记录中的字节长度，暂时写0，后面要返回来修改fwrite(&RecordByteNum, sizeof(short), 1, m_DbfFile_fp);short Reserved1 = 0;fwrite(&Reserved1, sizeof(short), 1, m_DbfFile_fp);BYTE Flag4s = 0;fwrite(&Flag4s, sizeof(BYTE), 1, m_DbfFile_fp);BYTE EncrypteFlag = 0;fwrite(&EncrypteFlag, sizeof(BYTE), 1, m_DbfFile_fp);int Unused[3] = { 0,0,0 };for (i = 0; i<3; i++)fwrite(Unused + i, sizeof(int), 1, m_DbfFile_fp);BYTE MDXFlag = 0;fwrite(&MDXFlag, sizeof(BYTE), 1, m_DbfFile_fp);BYTE LDriID = 0;fwrite(&LDriID, sizeof(BYTE), 1, m_DbfFile_fp);short Reserved2 = 0;fwrite(&Reserved2, sizeof(short), 1, m_DbfFile_fp);//****写记录项数组int fieldscount = fieldscount_final;          //字段数量可以根据读取的shp文件确定for (i = 0; i< fieldscount; i++){RecordItem recordItem = recordItems[i];   //recordItems是自己设置的记录项数组（字段）的数组，//根据需求设定每个记录项数组（字段）的参数，以供调用//****name--------11     bytesfwrite(recordItem.name, 11, 1, m_DbfFile_fp);//****FieldType----1     bytesfwrite(&(recordItem.fieldType), sizeof(BYTE), 1, m_DbfFile_fp);//****Reserved3----4     bytesfwrite(&(recordItem.Reserved3), sizeof(int), 1, m_DbfFile_fp);//****FieldLength--1     bytesfwrite(&(recordItem.fieldLength), sizeof(BYTE), 1, m_DbfFile_fp);//****DecimalCount-1   bytesfwrite(&(recordItem.decimalCount), sizeof(BYTE), 1, m_DbfFile_fp);//****Reserved4----2     bytesfwrite(&(recordItem.Reserved4), sizeof(short), 1, m_DbfFile_fp);//****WorkID-------1    bytesfwrite(&(recordItem.workID), sizeof(BYTE), 1, m_DbfFile_fp);//****Reserved5----10   bytesfor (j = 0; j<5; j++)fwrite(recordItem.Reserved5 + j, sizeof(short), 1, m_DbfFile_fp);//****MDXFlag1-----1  bytesfwrite(&(recordItem.mDXFlag1), sizeof(BYTE), 1, m_DbfFile_fp);}BYTE terminator = 13;                       //头文件终止标识符fwrite(&terminator, sizeof(BYTE), 1, m_DbfFile_fp);fseek(m_DbfFile_fp, 8, SEEK_SET);           //转到头文件字节数RecordByteNum，开始重写HeaderByteNum = 32 + 32 * fieldscount + 1;  //从version到Reserved2（共32） + n个字段 * 每一个字段长度 32 + terminatorfwrite(&HeaderByteNum, sizeof(short), 1, m_DbfFile_fp);RecordByteNum = 1 + 124;                    //RecordByteNum根据记录的实际长度来写，∑每个字段的长度 // 1 + 10 + 32 + 16 + 10 + 10 + 8 + 19 + 19 = 1 + 124 =125fseek(m_DbfFile_fp, 10, SEEK_SET);          //转移每条记录长度RecordByteNumfwrite(&RecordByteNum, sizeof(short), 1, m_DbfFile_fp);fseek(m_DbfFile_fp, 0, SEEK_END);//****写dbf文件头结束//****写每条记录BYTE deleteFlag;char media[40];for (i = 1; i <= RecordNum; i++){CGeoPolygon* polygon = (CGeoPolygon*)map->layer->objects[i - 1];deleteFlag = 32;                                    //默认写32fwrite(&deleteFlag, sizeof(BYTE), 1, m_DbfFile_fp); //读取删除标记  1字节//****写 ObjectID intstringstream ss;ss << (i - 1);string str = ss.str();int length = str.length();memset(media, '\0', 40);for (int m = 0; m < 10 - length; m++)media[m] = ' ';for (int c = 10 - length; c < 10; c++)media[c] = str[c - 10 + length];for (j = 0; j<10; j++)fwrite(media + j, sizeof(char), 1, m_DbfFile_fp);   //--10                  //****写Dest stringmemset(media, '\0', 40);media[0] = '/';for (int c = 1; c <32; c++)media[c] = ' ';for (j = 0; j<32; j++)fwrite(media + j, sizeof(char), 1, m_DbfFile_fp);   //--32//****写Ec stringfor (j = 0; j<16; j++)fwrite(media + j, sizeof(char), 1, m_DbfFile_fp);   //--16//****写EcRm intss << -8888;str = ss.str();length = str.length();memset(media, '\0', 40);for (int m = 0; m < 10 - length; m++) media[m] = ' ';for (int c = 10 - length; c < 10; c++) media[c] = str[c - 10 + length];for (j = 0; j<10; j++)fwrite(media + j, sizeof(char), 1, m_DbfFile_fp);   //--10//****写Elevt intfor (j = 0; j<10; j++)fwrite(media + j, sizeof(char), 1, m_DbfFile_fp);   //--10//****写Cc intstr = polygon->objectAttribute;memset(media, '\0', 40);length = str.length();for (int c = 0; c < length; c++) media[c] = str[c];for (int c = length; c < 8; c++) media[c] = ' ';for (j = 0; j<8; j++)fwrite(media + j, sizeof(char), 1, m_DbfFile_fp);   //--8//****写shape_length doubleCString str1;double shape_length = polygon->getAllLength();str1.Format(_T("%.11e"), shape_length);memset(media, '\0', 40);media[0] = ' ';for (int c = 1; c < 16; c++) media[c] = str1[c - 1];if (str1.GetLength() == 18)for (int c = 16; c < 19; c++) media[c] = str1[c - 1];else {media[16] = '0';media[17] = str1[15];media[18] = str1[16];}//*(media + length ) = '\0';for (j = 0; j<19; j++)fwrite(media + j, sizeof(char), 1, m_DbfFile_fp);   //--19//****写shape_Area doubledouble shape_area = polygon->shapeArea;str1.Format(_T("%.11e"), shape_area);memset(media, '\0', 40);media[0] = ' ';for (int c = 1; c < 16; c++) media[c] = str1[c - 1];if (str1.GetLength() == 18)for (int c = 16; c < 19; c++) media[c] = str1[c - 1];else {                  media[16] = '0';media[17] = str1[15];media[18] = str1[16];}for (j = 0; j<19; j++)fwrite(media + j, sizeof(char), 1, m_DbfFile_fp);   //--19}//****写dbf文件记录结束fclose(m_DbfFile_fp);
}