Product : ISaGRAF V3
Date : 5 March 1996
File : accres.access to resources of one application.htm
Subject : access to application resources from the target software
Below are some explanations about how to use resources in ISaGRAF V3
- the code of the application resources is fully integrated in the
ISaGRAF application code(TIC), and downloaded with the application.
- the ISaGRAF target does not provide any copy function for
resources (copy to files or data modules)
The function apl_def_resource from ISaGRAF kernel may be used to
have access to the description of one resource. Below is the
prototype of this function:
uchar *apl_def_resource (uint16 resource_number);
The "resource_number" parameter is the order number of the resource
in the resource directory (from 0 to N-1). It does not have any
correspondance with the resource definition file at the source
level. The function returns a pointer to a structure which defines
the selected resource. It returns NULL (0) if the selected number
is not a valid resource number.
Below is an example of a resource scanning algorithm:
res_num = 0;
while ((res_definition = apl_def_resource (res_num)) != 0)
/* operate *res_definition */
res_num += 1;
Below is the format of a resource definition structure:
long type; /* 1=binaryfile - 2=textfile -
3=ulongdata - 4=varlist */
long size; /* exact size of data */
uint32 path_offset; /* offset to be used to
points to a string terminated by 0 */
/* unused for ulongdata resources */
For text file resources, end-of-line characters are converted by the
resource compiler according to the target system conventions. All
pointers are 32 bit offsets from the base address of the
corresponding structure. All resource names and pathnames are
terminated by null characters.
Pathnames and resource data are stored after the resource directory
in the downloaded code:
Examples are provided in directory "accres.examples to access resources"
or ask to email@example.com
Copyright © 1996-2009 ICS Triplex ISaGRAF Inc. All rights reserved.