FREAD

FREAD

Reads a record from an external file into the File Data Buffer (FDB)

Category: External File

Syntax
Details
Example
See Also

Syntax

sysrc=FREAD(file-id);

sysrc

contains the return code for the operation:

0	successful
0	not successful

Type: Numeric

file-id

contains the identifier that was assigned when the file was opened. If file-id is invalid, the program halts.

Type: Numeric

Details

The position of the file pointer is automatically updated after the read operation so that successive FREAD functions read successive file records.

Use FNOTE, FPOINT, and FREWIND to position the file pointer explicitly.

Example

Assign the fileref MYFILE to an external file and attempt to open the file. Read each record from the file and list it in the LOG window.

   /* Assign the fileref MYFILE to the physical */
   /* filename stored in the variable FNAME     */
   /* and open it.                              */
rc=filename('myfile',fname);
fileid=fopen('myfile');
if (fileid>0) then
   do while(fread(fileid)=0);
      rc=fget(fileid,c,200);
      put c;
   end;
rc=fclose(fileid);
rc=filename('myfile','');

See Also

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