Difference between revisions of "FOPEN()"
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==Purpose== | ==Purpose== | ||
Function to open an existing ASCII text file or http URL | Function to open an existing ASCII text file or http URL | ||
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==Syntax== | ==Syntax== | ||
Revision as of 15:32, 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().
From Recital 10, the FOPEN() function can also be used to open http page URLs. Please see below for an example.
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
