Wiki Page Content

Differences between revisions 9 and 10
Revision 9 as of 2010-08-22 20:06:32
Size: 1904
Editor: SheenaSmith
Comment: minor change
Revision 10 as of 2010-08-22 20:16:47
Size: 1934
Editor: SheenaSmith
Comment: update content for consistency
Deletions are marked like this. Additions are marked like this.
Line 27: Line 27:
*<<BR>>
Line 53: Line 54:
}}} }}}<<BR>>*
Line 56: Line 57:
This is not a predefined function, just a macro that calls whatever seek function has been placed in the SDL_RWops structure. *<<BR>>This is not a predefined function, just a macro that calls whatever seek function has been placed in the SDL_RWops structure.<<BR>>*

SDL_RWseek

Use this function to seek within an SDL_RWops data source.

Syntax

long SDL_RWseek(SDL_RWops* context,
                long       offset, 
                int        whence)

green

Function Parameters

context

a pointer to an SDL_RWops structure

offset

an offset in bytes, relative to whence location; can be negative

whence

any of RW_SEEK_SET, RW_SEEK_CUR, RW_SEEK_END; see Remarks for details

Return Value

Returns the final offset in the data source after the seek.

Code Examples

*

#include <stdio.h>
#include "SDL_rwops.h"

int main()
{
  long length;
  SDL_RWops *rw=SDL_RWFromFile("myfile.bin","rb");
  if(rw==NULL)
  {
    fprintf(stderr,"Couldn't open myfile.bin\n");
    return(1);
  }

  /* Seek to 0 bytes from the end of the file -- i.e. the exact end of file */
  length=SDL_RWseek(rw,0,SEEK_END);
  SDL_RWclose(rw);
  if(length<0)
  {
    fprintf(stderr,"Could not seek inside myfile.bin\n");
    return(2);
  }

  fprintf(stderr,"myfile.bin is %d bytes long\n",length);
  return(0);
}


*

Remarks

*
This is not a predefined function, just a macro that calls whatever seek function has been placed in the SDL_RWops structure.
*

whence may be any of the following values:

RW_SEEK_SET

seek from the beginning of data

RW_SEEK_CUR

seek relative to current read point

RW_SEEK_END

seek relative to the end of data


CategoryAPI, CategoryIO

None: SDL_RWseek (last edited 2015-06-20 20:01:11 by PhilippWiesemann)

Feedback
Please include your contact information if you'd like to receive a reply.
Submit