Initializing help system before first use

XPRBreadarrlinecb

XPRBreadarrlinecb

Purpose
Read a line of an array from a data file.
Synopsis
int XPRBreadarrlinecb(char *(*fgs)(char *,int,void *), void *file, int length, const char *format, void *arrc, int size);
Arguments
fgs 
The system's fgets function (defined by XPRB_FGETS).
file 
Pointer to a data file.
length 
Maximum length of any text string to be read.
format 
String indicating the format of the data file to be read, consisting of one of the listed values followed by a separator sign:
t[num] 
text up to next separator sign or space (blank/tabulator/line break), optionally followed by the maximum string length to be read;
s[num] 
text marked by single quotes ( ' '), optionally followed by the maximum string length to be read;
S[num] 
text marked by double quotes ( " "), optionally followed by the maximum string length to be read;
T[num] 
text, as for t, s, or S, depending on the first character read, optionally followed by the maximum string length to be read;
i 
integer value;
g 
real (float) value.
arrc 
Array of size at least size that receives the data that are read.
size 
Maximum number of data items to be read.
Return value
Number of data items read.
Example 
double vlist[10];
FILE *datafile;
   ...
datafile=fopen("filename", "r");
XPRBreadlinecb(XPRB_FGETS, datafile, 120, "g ", vlist, 6);
fclose(datafile);
This opens a data file and reads a line of six double values separated by spaces, before closing the file.
Further information
This function reads tables from data files in a format compatible with the diskdata command of mp-model and Mosel. Data lines in the input file may be continued over several lines by using the line continuation sign &. The input file may also contain comments (preceded by !) and empty lines, both of which are skipped over. The data file is accessed with standard C functions ( fopen, fclose). The function reads up to size data items of the type indicated by the format parameter. All string types in the format may (optionally) be followed by the maximum string length to be read. Otherwise the maximum length is assumed to be length. The type of separator signs ( e.g. , ; :) used in the data file needs to be given after the format option(s). Array arrc is an array of the same type as the data to be read ( int *, char *, or double *) and of size at least size. With function XPRBsetdecsign the decimal sign used in the data input may be changed, for instance to use a decimal comma.
Related topics
XPRBreadlinecb, XPRBsetdecsign.

Parent Topic BCL C library functions

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