How to Open a file which is in the memory by H5Pset_fapl_core?

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1

I could create a simple file in memory by

*fapl = H5Pcreate(H5P_FILE_ACCESS);*
*H5Pset_fapl_core(fapl,1024,0);*
*file = H5Fcreate(H5FILE_NAME, H5F_ACC_TRUNC, H5P_DEFAULT, fapl);*

And I want to use H5Fopen to get this file in memory.
*file = H5Fopen(H5FILE_NAME, H5F_ACC_RDWR, fapl);*

···

*
*
But I failed.
The error is:
*HDF5-DIAG: Error detected in HDF5 (1.8.11) thread 0:*
* #000: H5F.c line 1582 in H5Fopen(): unable to open file*
* major: File accessibilty*
* minor: Unable to open file*
* #001: H5F.c line 1271 in H5F_open(): unable to open file: time = Fri Jun
21 03:19:11 2013*
*, name = 'Driver_test5.h5', tent_flags = 1*
* major: File accessibilty*
* minor: Unable to open file*
* #002: H5FD.c line 987 in H5FD_open(): open failed*
* major: Virtual File Layer*
* minor: Unable to initialize object*
* #003: H5FDcore.c line 441 in H5FD_core_open(): unable to open file*
* major: File accessibilty*
* minor: Unable to open file*

The document said :The H5FD_CORE driver enables an application to work with
a file in memory, speeding reads and writes as no disk access is made.

How to fix it and What should I do?

Thanks

2

Hi Long,

I could create a simple file in memory by

fapl = H5Pcreate(H5P_FILE_ACCESS);
H5Pset_fapl_core(fapl,1024,0);
file = H5Fcreate(H5FILE_NAME, H5F_ACC_TRUNC, H5P_DEFAULT, fapl);

And I want to use H5Fopen to get this file in memory.
file = H5Fopen(H5FILE_NAME, H5F_ACC_RDWR, fapl);

But I failed.
The error is:
HDF5-DIAG: Error detected in HDF5 (1.8.11) thread 0:
  #000: H5F.c line 1582 in H5Fopen(): unable to open file
    major: File accessibilty
    minor: Unable to open file
  #001: H5F.c line 1271 in H5F_open(): unable to open file: time = Fri Jun 21 03:19:11 2013
, name = 'Driver_test5.h5', tent_flags = 1
    major: File accessibilty
    minor: Unable to open file
  #002: H5FD.c line 987 in H5FD_open(): open failed
    major: Virtual File Layer
    minor: Unable to initialize object
  #003: H5FDcore.c line 441 in H5FD_core_open(): unable to open file
    major: File accessibilty
    minor: Unable to open file

The document said :The H5FD_CORE driver enables an application to work with a file in memory, speeding reads and writes as no disk access is made.

How to fix it and What should I do?

  Try using the "file image" routines:

H5Pset_file_image
H5Pget_file_image
H5Pset_file_image_callbacks
H5Pget_file_image_callbacks

  http://www.hdfgroup.org/HDF5/doc/RM/RM_H5P.html

    Quincey

···

On Jun 20, 2013, at 8:20 PM, long zhao <comlong@gmail.com> wrote: