#include "plyloader.h"

#include <string.h>

PlyLoader::PlyLoader(QObject *parent) :

QObject(parent)

{

}

bool PlyLoader::LoadModel(QString filename)

{

if (filename != NULL)

{

/*

QFile file(filename);

if (!file.open(QIODevice::ReadOnly | QIODevice::Text))

return -1;

*/

string name = filename.toStdString();

FILE *file = NULL;

file = fopen(name.data(),"r");

fseek(file, 0, SEEK_END);//获取文件全部数据

mp_vertexXYZ = (float*)malloc(10000000);//long int ftell (FILE *stream); Returns the current value of the position indicator of the stream.

fseek(file, 0, SEEK_SET);//操作符指向文件流开头

if (file)

{

int i = 0;

char buffer[3000];

fgets(buffer, 300, file);//char *fgets (char *str, int num, FILE *stream); Get string from stream

// READ HEADER

// Find number of vertexes

while (strncmp("element vertex", buffer,strlen("element vertex")) != 0 )//int strncmp (const char *str1, const char *str2, size_t num); Compare characters of two strings

{

fgets(buffer, 300, file); //如果一直没有找到element vertex字符串，就一直从文件流中取出300个元素，直到找到为止

}

strcpy(buffer, buffer + strlen("element vertex"));//char *strcpy ( char *destination, const char *source ); Copy string

sscanf(buffer, "%i", &this->m_totalConnectedPoints);//int sscanf ( const char * s, const char * format, ...); Read formatted data from string

// go to end_header

while (strncmp( "end_header", buffer,strlen("end_header")) != 0 )

{

fgets(buffer, 600, file);

}

// read vertices

i =0;

for (int iterator = 0; iterator < this->m_totalConnectedPoints; iterator++)

{

fgets(buffer, 600, file);

sscanf(buffer,"%f %f %f", &mp_vertexXYZ[i], &mp_vertexXYZ[i+1], &mp_vertexXYZ[i+2]);

i += 3;

}

fclose(file);

}

return true;

}

else

return false;

}