以二进制格式写入vtk文件 [英] Write vtk file in binary format
本文介绍了以二进制格式写入vtk文件的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在尝试从我的C ++代码编写一个vtk文件.我有两个版本，一个是ASCII，另一个是二进制.ASCII版本效果很好.
I am trying to write a vtk file from my C++ code. I have two versions, one ASCII and the other binary. The ASCII version works well.
我想做与此类似的事情:写入二进制VTK文件时出错
I want to do something similar to this post : Error writing binary VTK files
这是我的代码:
std::ofstream file;
if(is_binary)
file.open("test.vtk", std::ios::out | std::ios::binary);
else
file.open("test.vtk");
file << "# vtk DataFile Version 2.0" << std::endl
<< "Comment if needed" << std::endl;
if(is_binary)
file << "BINARY"<< std::endl << std::endl;
else
file << "ASCII"<< std::endl << std::endl;
file << "DATASET POLYDATA" << std::endl << "POINTS " << nb_particles << " float" << std::endl;
for(size_t cell_i=0;cell_i<n_cells;cell_i++)
for(size_t i =0; i<cells[cell_i].size();++i)
{
if(is_binary)
{
double rx = cells[cell_i][field::rx][i];
double ry = cells[cell_i][field::ry][i];
double rz = cells[cell_i][field::rz][i];
SwapEnd(rx);
SwapEnd(ry);
SwapEnd(rz);
file.write(reinterpret_cast<char*>(&rx), sizeof(double));
file.write(reinterpret_cast<char*>(&ry), sizeof(double));
file.write(reinterpret_cast<char*>(&rz), sizeof(double));
}
else
{
Vec3d tmp = grid.particle_position(cell_i,i);
file << tmp.x << " " << tmp.y << " " << tmp.z << std::endl;
}
}
if(is_binary)
file << std::endl;
file << "POINT_DATA " << nb_particles << std::endl;
if(has_id_field)
{
file<< "SCALARS index int 1" << std::endl<< "LOOKUP_TABLE default" << std::endl;
for(size_t cell_i=0;cell_i<n_cells;cell_i++)
for(size_t i =0; i<cells[cell_i].size();++i)
{
if(is_binary)
{
uint64_t id = cells[cell_i][field::id][i];
SwapEnd(id);
file.write(reinterpret_cast<char*>(&id), sizeof(uint64_t));
}
else
file << cells[cell_i][field::id][i] << std::endl;
}
if(is_binary)
file << std::endl;
}
if(has_type_field)
{
file<< "SCALARS type int 1" << std::endl<< "LOOKUP_TABLE default" << std::endl;
for(size_t cell_i=0;cell_i<n_cells;cell_i++)
for(size_t i =0; i<cells[cell_i].size();++i)
{
if(is_binary)
{
uint8_t type;
SwapEnd(type);
file.write(reinterpret_cast<char*>(&type), sizeof(uint8_t));
}
else
file << static_cast<int>(cells[cell_i][field::type][i]) << std::endl;
}
if(is_binary)
file << std::endl;
}
file.close();
具有以下功能:
void SwapEnd(T& var)
{
char* varArray = reinterpret_cast<char*>(&var);
for(long i = 0; i < static_cast<long>(sizeof(var)/2); i++)
std::swap(varArray[sizeof(var) - 1 - i],varArray[i]);
}
我的系统是小端的:
lscpu | grep "Byte Order"
Byte Order: Little Endian
paraview在读取输出文件时出错:
paraview make an error on the reading the output file :
vtkPolyDataReader (0x3863800): Unrecognized keyword: @aic�9h��8
我做得不好吗?
推荐答案
好的，问题是我编写二进制文件时数据的大小.遵循以下代码安逸性工作.希望能对某人有所帮助.
ok, the problem was the size of datas when I wrote the binary. This following peace of code works. Hope that can help someone.
std::ofstream file;
if(is_binary)
file.open("test.vtk", std::ios::out | std::ios::binary);
else
file.open("test.vtk");
file << "# vtk DataFile Version 2.0" << std::endl
<< "Comment if needed" << std::endl;
if(is_binary)
file << "BINARY"<< std::endl << std::endl;
else
file << "ASCII"<< std::endl << std::endl;
file << "DATASET POLYDATA" << std::endl << "POINTS " << nb_particles << " double" << std::endl;
for(size_t cell_i=0;cell_i<n_cells;cell_i++)
for(size_t i =0; i<cells[cell_i].size();++i)
{
if(is_binary)
{
double rx = cells[cell_i][field::rx][i];
double ry = cells[cell_i][field::ry][i];
double rz = cells[cell_i][field::rz][i];
SwapEnd(rx);
SwapEnd(ry);
SwapEnd(rz);
file.write(reinterpret_cast<char*>(&rx), sizeof(double));
file.write(reinterpret_cast<char*>(&ry), sizeof(double));
file.write(reinterpret_cast<char*>(&rz), sizeof(double));
}
else
{
Vec3d tmp = grid.particle_position(cell_i,i);
file << tmp.x << " " << tmp.y << " " << tmp.z << std::endl;
}
}
if(is_binary)
file << std::endl;
file << "POINT_DATA " << nb_particles << std::endl;
if(has_id_field)
{
file<< "SCALARS index int 1" << std::endl<< "LOOKUP_TABLE default" << std::endl;
for(size_t cell_i=0;cell_i<n_cells;cell_i++)
for(size_t i =0; i<cells[cell_i].size();++i)
{
if(is_binary)
{
uint64_t id = cells[cell_i][field::id][i];
int id_i = static_cast<int>(id);
SwapEnd(id_i);
file.write(reinterpret_cast<char*>(&id_i), sizeof(int));
}
else
file << cells[cell_i][field::id][i] << std::endl;
}
if(is_binary)
file << std::endl;
}
if(has_type_field)
{
file<< "SCALARS type int 1" << std::endl<< "LOOKUP_TABLE default" << std::endl;
for(size_t cell_i=0;cell_i<n_cells;cell_i++)
for(size_t i =0; i<cells[cell_i].size();++i)
{
if(is_binary)
{
uint8_t type= cells[cell_i][field::type][i];
int type_i = static_cast<int>(type);
SwapEnd(type_i);
file.write(reinterpret_cast<char*>(&type_i), sizeof(int));
}
else
file << static_cast<int>(cells[cell_i][field::type][i]) << std::endl;
}
if(is_binary)
file << std::endl;
}
file.close();
这篇关于以二进制格式写入vtk文件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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