Differences

This shows you the differences between two versions of the page.

--- uphp:functions:fread [2017/04/12 12:55]
jeff
+++ uphp:functions:fread [2021/09/13 05:57]
@@ Line 1: / Line 1: @@
-======fread======
-<badge>WMPRO, WMMINI FW >= 1.0</badge> <badge>WMMEGA FW >= 2.0</badge>
-Read bytes from a file, stream or socket
-====Description====
-<well size="sm">
-<html>
-<span style="font-size:125%;color:green">mixed
-<span style="color:black">
-</html>
-[[fread]] (
-<html>
-<span style="color:green">int
-<span style="color:blue">$handle<span style="color:black">,
-<span style="color:green">int
-<span style="color:blue">$bytes
-<span style="color:black">)
-</html>
-</well>
-This function attempts to read a specified number of bytes from a file, stream or socket. If less than the number of bytes are available it will return the available data. If no data is available it will return an empty string.
-====Parameters====
-<html><b><span style="color:blue">$handle<span style="color:black"></b></html>:  Valid handle of a previously opened resource
-<html><b><span style="color:blue">$bytes<span style="color:black"></b></html>:  Limit to the number of bytes returned
-====Return Values====
-  * <html><b><span style="color:green">String<span style="color:black"></b></html> containing the data requested from the resource
-    * <html>The length of the returned <b><span style="color:green">string<span style="color:black"></b> depends on available data (<b>0 to <span style="color:blue">$bytes<span style="color:black"></b>)</html>
-  * <html><b><span style="color:green">Integer<span style="color:black"></b></html> 0 for error
-====Example====
-**Read the 32 byte MD5 hash from file /md5.txt:**
-<code php>
-<?
-  $fp=fopen("/md5.txt","r");
-  if ($fp) {
-    $data=fread($fp,32); // read 32 bytes from the file
-    print($data);
-    fclose($fp);
-  } else {
-    print("File open failed\n");
-  }
-?>
-</code>
-====See Also====
-[[fopen()]] - Open a file for reading or writing
-[[fseropen()]] - Open the serial port at the specified baud rate with optional parameters
-[[f485open()]] - Open the RS-485 port at the specified baud rate and parity
-[[fsockopen()]] - Open an internet socket connection with optional timeout
-[[fgets()]] - Return a single line from a file, stream or socket, with optional size limit
-[[fwrite()]] - Write data to a file, stream or socket
-[[feof()]] - Test if no more data is available in a file, stream or socket
-[[filesize()]] - Return the size of a file, or the number of unread bytes in a stream or socket
-[[fseek()]] - Position the file pointer in an open file
-[[ftell()]] - Return the current position of a file read/write pointer
-[[fclose()]] - Close a file, stream or socket

Wattmon Documentation Wiki

User Tools

Site Tools

Differences

Page Tools