C++ c++；将矢量写入hdf5文件而不存储在阵列中

我试图在一个.h5文件中存储4个向量（大小可变，但所有4个向量的大小都相同）。 直到现在，我都是这样做的：

void write_file_h5(std::string filename,
            std::vector<int16_t> &x,
            std::vector<int16_t> &y,
            std::vector<int8_t> &p,
            std::vector<int32_t> &ts)
{
  struct myEvent myEvents[x.size()];
  for (int i=0; i<x.size();i++)
  {
    myEvents[i].x = x[i];
    myEvents[i].y = y[i];
    myEvents[i].p = int(p[i]);
    myEvents[i].ts = ts[i];
  }
  H5::CompType mtype(sizeof(myEvent));
  // Define the datatype to pass HDF5
  mtype.insertMember("x", HOFFSET(myEvent, x), H5::PredType::NATIVE_INT16);
  mtype.insertMember("y", HOFFSET(myEvent, y), H5::PredType::NATIVE_INT16);
  mtype.insertMember("p", HOFFSET(myEvent, p), H5::PredType::NATIVE_INT8);
  mtype.insertMember("ts", HOFFSET(myEvent, ts), H5::PredType::NATIVE_INT32);


  // preparation of a dataset and a file.
  hsize_t dim[1];
  dim[0] = sizeof(myEvents) / sizeof(myEvent);
  int rank = sizeof(dim) / sizeof(hsize_t);
  H5::DataSpace space(rank, dim);
  H5::H5File *file = new H5::H5File(filename, H5F_ACC_TRUNC);
  H5::DataSet *dataset = new H5::DataSet(file->createDataSet("myDataset", mtype, space));
  dataset->write(myEvents, mtype);
  delete dataset;
  delete file;
}

我想这是因为我试图创建的数组太大了。 有人知道如何解决这个问题吗？i、 e.如何在使用最小内存量的情况下写入向量？ 我需要向量，因为我需要在程序执行期间动态填充它们。。。因此，直接将值存储在数组中似乎是不可能的

提前感谢这一行

struct myEvent myEvents[x.size()];

创建可能放置在堆栈上的非标准（C++中）数组

将其替换为

std:：vector

，以在堆上分配内存

void write_file_h5(std::string filename,
            std::vector<int16_t> &x,
            std::vector<int16_t> &y,
            std::vector<int8_t> &p,
            std::vector<int32_t> &ts)
{
  // Suggestion: check that y, p and ts has at least as many elements as x
  std::vector<myEvent> myEvents(x.size());  // replacement for the VLA

  for (int i=0; i<x.size();i++) {
    myEvents[i].x = x[i];
    myEvents[i].y = y[i];
    myEvents[i].p = int(p[i]);
    myEvents[i].ts = ts[i];
  }

  H5::CompType mtype(sizeof(myEvent));
  // Define the datatype to pass HDF5
  mtype.insertMember("x", HOFFSET(myEvent, x), H5::PredType::NATIVE_INT16);
  mtype.insertMember("y", HOFFSET(myEvent, y), H5::PredType::NATIVE_INT16);
  mtype.insertMember("p", HOFFSET(myEvent, p), H5::PredType::NATIVE_INT8);
  mtype.insertMember("ts", HOFFSET(myEvent, ts), H5::PredType::NATIVE_INT32);

  // preparation of a dataset and a file.
  hsize_t dim[1];
  dim[0] = myEvents.size();                   // using vector::size()
  int rank = sizeof(dim) / sizeof(hsize_t);
  H5::DataSpace space(rank, dim);

  H5::H5File *file = new H5::H5File(filename, H5F_ACC_TRUNC);
  H5::DataSet *dataset = new H5::DataSet(file->createDataSet("myDataset", mtype, space));
  dataset->write(myEvents.data(), mtype);     // use vector::data()
  delete dataset;
  delete file;
}

---

查找迭代器：for（auto-xit=x.begin（）；xit！=x.end（）；xit++）do_something_with（*xit）；仅由于内存限制，无法通过堆分配（如果使用正确的方法）获得分段错误。但在您的示例中，应用了应该避免的堆栈分配-这是VLA（非标准）。使用

std:：vector myEvents（x.size（））取而代之。您是否还检查了所有传入向量的大小是否相同？是否必须对
H5
类使用
new
和
delete
？而不是
H5:：H5File*file=新的H5:：H5File（文件名，H5F_ACC_TRUNC）
（然后
删除文件
）使用
H5:：H5文件（文件名，H5F\u ACC\u TRUNC）会更干净
和no
删除
@tedlynmo谢谢你的回答。分段错误确实发生在“struct MyEvent myEvents[x.size（）]；”行。。。所以这一定是个问题。但是，它必须是结构而不是向量，因为H5类不接受向量。此外，我检查了所有传入向量的大小是否相同。。。你对如何修复struct有什么想法吗？
void write_file_h5(std::string filename,
            std::vector<int16_t> &x,
            std::vector<int16_t> &y,
            std::vector<int8_t> &p,
            std::vector<int32_t> &ts)
{
  // Suggestion: check that y, p and ts has at least as many elements as x
  std::vector<myEvent> myEvents(x.size());  // replacement for the VLA

  for (int i=0; i<x.size();i++) {
    myEvents[i].x = x[i];
    myEvents[i].y = y[i];
    myEvents[i].p = int(p[i]);
    myEvents[i].ts = ts[i];
  }

  H5::CompType mtype(sizeof(myEvent));
  // Define the datatype to pass HDF5
  mtype.insertMember("x", HOFFSET(myEvent, x), H5::PredType::NATIVE_INT16);
  mtype.insertMember("y", HOFFSET(myEvent, y), H5::PredType::NATIVE_INT16);
  mtype.insertMember("p", HOFFSET(myEvent, p), H5::PredType::NATIVE_INT8);
  mtype.insertMember("ts", HOFFSET(myEvent, ts), H5::PredType::NATIVE_INT32);

  // preparation of a dataset and a file.
  hsize_t dim[1];
  dim[0] = myEvents.size();                   // using vector::size()
  int rank = sizeof(dim) / sizeof(hsize_t);
  H5::DataSpace space(rank, dim);

  H5::H5File *file = new H5::H5File(filename, H5F_ACC_TRUNC);
  H5::DataSet *dataset = new H5::DataSet(file->createDataSet("myDataset", mtype, space));
  dataset->write(myEvents.data(), mtype);     // use vector::data()
  delete dataset;
  delete file;
}

  H5::H5File file(filename, H5F_ACC_TRUNC);
  H5::DataSet dataset(file.createDataSet("myDataset", mtype, space));
  dataset.write(myEvents.data(), mtype);