Difference between revisions of "FOPEN()"
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Latest revision as of 15:46, 17 November 2010
Purpose
Function to open an existing ASCII text file or http URL
Syntax
FOPEN(<expC> [,expN>])
See Also
FCREATE(), FCLOSE(), FEOF(), FERROR(), FFLUSH(), FGETS(), FPUTS(), FREAD(), FREADSTR(), FSEEK(), FWRITE(), GETURL(), MEMOREAD(), MEMOWRITE(), TEXTEDIT()
Description
The FOPEN() function opens an existing ASCII text file. It returns a numeric file pointer when the file is opened successfully, or a -1 if unsuccessful. The <expC> is the name of the ASCII file to open. Since the file pointer is required to identify an open file to other file functions, always assign the return value to a memory variable. The optional <expN> determines the file access mode:
| <expN> | Access Mode |
|---|---|
| If not specified, read-only | |
| 0 | Read-only |
| 1 | Write only. Existing contents are deleted. |
| 2 | Append. Text may be added to the end of the existing contents. |
If an error occurs, -1 is returned by the FERROR() function. The FCLOSE() function is used to close a file which has been opened with FOPEN().
Recital 10 enhancements
The FOPEN() function can also be used to open http page URLs. The specified <expC> is the URL to open: http://twitter.com/recitalsoftware. Please see below for an example.
The FOPEN() function can also be used to open Linux FIFO pipes. The specified <expC> is the pipe to open: fifo://pipename.
Example
use accounts fp=fopen("existing.file") if ferror()=-1 dialog box "The file could not be opened." else string = fgets(fp) do while not empty(string) ? string string = fgets(fp) enddo ? endif fclose(fp) if ferror()=-1 dialog box "The file could not be closed." endif // http URL example <!-- twitter.rsp --> <html> <body> <% fp=fopen("http://twitter.com/recitalsoftware") do while not feof(fp) ? fgets(fp) enddo %> </body> </html>
Products
Recital, Recital Server
