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Full Discussion: Storing C++-struct in file - problem when adding new item in struct
Top Forums Programming Storing C++-struct in file - problem when adding new item in struct Post 302569725 by Corona688 on Tuesday 1st of November 2011 11:08:54 AM
Old 11-01-2011
You are mistaken. You cannot store "char *" in a file this way. You are storing pointers which, when you get them back, happen to point to some valid location in memory, but no mystical translation is happening -- a pointer is stored as 4 or 8 bytes, the data you wanted to store was never stored.

You must use fixed-size arrays like everything else.
 

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LEARN ABOUT CENTOS

glclearbuffersubdata

GLCLEARBUFFERSUBDATA(3G)					   OpenGL Manual					  GLCLEARBUFFERSUBDATA(3G)

NAME

       glClearBufferSubData - fill all or part of buffer object's data store with a fixed value

C SPECIFICATION

       void glClearBufferSubData(GLenum target, GLenum internalformat, GLintptr offset, GLsizeiptr size, GLenum format, GLenum type,
				 const void * data);

PARAMETERS

       target
	   Specify the target of the operation.  target must be one of the global buffer binding targets.

       internalformat
	   The internal format with which the data will be stored in the buffer object.

       offset
	   The offset, in basic machine units into the buffer object's data store at which to start filling.

       size
	   The size, in basic machine units of the range of the data store to fill.

       format
	   The format of the data in memory addressed by data.

       type
	   The type of the data in memory addressed by data.

       data
	   The address of a memory location storing the data to be replicated into the buffer's data store.

DESCRIPTION

       glClearBufferSubData fills a specified region of a buffer object's data store with data from client memory.  offset and size demark the
       extent of the region within the data store of the buffer object bound to target to fill with data. Data, initially supplied in a format
       specified by format in data type type is read from the memory address given by data and converted into the internal representation given by
       internalforamt. This converted data is then replicated throughout the specified region of the buffer object's data store.

       If data is NULL, then the subrange of the buffer's data store is filled with zeros.

ERRORS

       GL_INVALID_ENUM is generated if target not one of the generic buffer binding targets.

       GL_INVALID_VALUE is generated if no buffer is bound to target.

       GL_INVALID_ENUM is generated if internalformat is not a sized internal format.

       GL_INVALID_VALUE is generated if offset or range are not multiples of the number of basic machine units per-element for the internal format
       specified by internalformat.

       GL_INVALID_VALUE is generated if offset or size is less than zero, or if offset + size is greater than the value of GL_BUFFER_SIZE for the
       buffer bound to target.

       GL_INVALID_OPERATION is generated if any part of the specified buffer range is mapped with glMapBufferRange() or glMapBuffer().

SEE ALSO

       glClearBufferData().

COPYRIGHT

       Copyright (C) 2012 Khronos Group. This material may be distributed subject to the terms and conditions set forth in the Open Publication
       License, v 1.0, 8 June 1999.  http://opencontent.org/openpub/.

AUTHORS

       opengl.org

opengl.org							    06/10/2014						  GLCLEARBUFFERSUBDATA(3G)
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