用C读取DXF中的直线数量和坐标
首先，定义直线、圆的结构体，把它们保存在ineStruct.h中
//#include "lineStruct.h"
#define STRLEN 60
#define DATASIZE sizeof(EntityData)
/*-----每个实体的结构-----*/
//你可在在此添加其它的实体
//为了提高精度，变量可定义为双精度型
typedef struct tagLine{
float x1,y1,z1;
float x2,y2,z2;
}LINE;
typedef struct tagCircle{
float x,y,z;
float radius;
}CIRCLE;
/*------------------------*/
typedef union specialData{
LINE line;
CIRCLE circle;
}privateData;
/*------实体的数据结构-------*/
typedef struct commonData{
char id[STRLEN]; /*实体标识字符串*/
char layer[STRLEN]; /*层名字符串*/
privateData data; /*特有数据块*/
struct commonData *next; /*用于构建链表*/
}EntityData;
//定义完数据结构后，就可以用链表结构来存储实体中有用的信息了。
//以下程序为读取实体LINE的有关信息的代码。
/*------------------------------------------
*Entity.C 读取实体LINE部分内容。
*-------------------------------------------*///line.cpp
#include "lineStruct.h"
#include
#include
#include
#include
/*----------函数声明部分-----------*/
void print(EntityData *entity);
/*---------------------------------*/
int main(int argc,char *argv[])
{
int code;
float value;
char codevalue[STRLEN];
FILE *dxf;
char filename[STRLEN];
char suffix[6] = ".dxf";
EntityData *entity,*entity1,*entity2;
printf("请输入DXF文件名:");
gets(filename);
strcat(filename,suffix);
dxf = fopen(filename,"r");
if(!dxf) {
printf("打开文件出错!\n可能不存在此文件.\n");
printf("按任意键退出...");
getch();
exit(0);
}
else {
printf("正在读取文件...\n");
}
entity = entity2 = (EntityData *)malloc(DATASIZE);
while(!feof(dxf)) {
fscanf(dxf,"%d",&code);
fscanf(dxf,"%s",codevalue);
if(code == 2 && strcmp(codevalue,"ENTITIES")==0) {
while(strcmp(codevalue,"ENDSEC")) {
fscanf(dxf,"%d",&code);
fscanf(dxf,"%s",codevalue);
if(code == 0 && strcmp(codevalue,"LINE")==0) {
entity1 = (EntityData *)malloc(DATASIZE);
strcpy(entity1->id,codevalue);
fscanf(dxf,"%d",&code);
while(code) {
switch(code) {
case 8:
fscanf(dxf,"%s",codevalue);
fscanf(dxf,"%d",&code);
strcpy(entity1->layer,codevalue);
break;
case 10:
fscanf(dxf,"%f",&value);
fscanf(dxf,"%d",&code);
entity1->data.line.x1 = value;
break;
case 20:
fscanf(dxf,"%f",&value);
fscanf(dxf,"%d",&code);
entity1->data.line.y1 = value;
break;
case 30:
fscanf(dxf,"%f",&value);
fscanf(dxf,"%d",&code);
entity1->data.line.z1 = value;
break;
case 11:
fscanf(dxf,"%f",&value);
fscanf(dxf,"%d",&code);
entity1->data.line.x2 = value;
break;
case 21:
fscanf(dxf,"%f",&value);
fscanf(dxf,"%d",&code);
entity1->data.line.y2 = value;
break;
case 31:
fscanf(dxf,"%f",&value);
fscanf(dxf,"%d",&code);
entity1->data.line.z2 = value;
break;
default: {
fscanf(dxf,"%s",codevalue);
fscanf(dxf,"%d",&code);
}
}
}
entity2->next = entity1;
entity2 = entity1;
}
}
entity2->next = NULL;
}
}
entity = entity->next; //第一个实体区为空，所以使头指针移向下一个实体
print(entity); //输出链表
printf("\nPress any key to halt...");
getch();
return 0;
}
//输出链表
void print(EntityData *entity)
{
int i=0;
EntityData *pointer;
pointer = entity;
if(pointer != NULL) {
do{
i++;
pointer = pointer->next;
}while(pointer != NULL);
}
printf("\nOutput LinkList:");
printf("\nDXF文件中总共有%d条直线:\n",i);
i = 1;
pointer = entity;
if(pointer != NULL) {
do{
printf("第%d条直线:\n",i);
printf("X1=%f\tY1=%f\tZ1=%f\n",pointer->data.line.x1,
pointer->data.line.y1,pointer->data.line.z1);
printf("X2=%f\tY2=%f\tZ2=%f\n",pointer->data.line.x2,
pointer->data.line.y2,pointer->data.line.z2);
pointer = pointer->next;
i++;
}while(pointer !=NULL);
}
}
效果如下：
参考地址:
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http://blog.csdn.net/eryar/article/details/2371755