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--- uphp:functions:ftell [2017/05/11 23:03]
jeff
+++ uphp:functions:ftell [2021/09/13 05:57]
@@ Line 1: / Line 1: @@
-======ftell======
-<badge>WMPRO, WMMINI FW >= 1.94</badge> <badge>WMMEGA FW >= 2.0</badge>
-Return the current position of a file read/write pointer
-====Description====
-<well size="sm"><html>
-<span style="font-size:125%;color:green">int
-<span style="color:black">ftell (
-<span style="color:green">int
-<span style="color:blue">$handle
-<span style="color:black">)
-</html></well>
-Return the current file pointer position in an active previously opened file
-====Parameter====
-<html><b><span style="color:blue">$handle<span style="color:black"></b></html>:  Valid handle of a previously opened file
-====Return Values====
-<html><b><span style="color:green">Integer<span style="color:black"></b></html> file pointer position (returns 0 for the beginning of a file)
-====Example====
-<code php>
-<pre><?
-  $file="/ftell_example.txt"
-  $fp=fopen($file,"w");
-  if ($fp) {
-    print("                  Beginning position: ".ftell($fp)."\r\n");
-    fwrite($fp,"0123456789");
-    print("Position after writing 10 characters: ".ftell($fp)."\r\n");
-    fseek($fp,-2,1);
-    print("    Position after moving pointer -2: ".ftell($fp)."\r\n");
-    print("   The character at that position is: ".fread($fp,1)."\r\n");
-    fclose($fp);
-    unlink($file);
-  } else {
-    print("File open failed\r\n");
-  }
-?></pre></code>
-The above example will ouput:
-<code>
-                  Beginning position: 0
-Position after writing 10 characters: 10
-    Position after moving pointer -2: 8
-   The character at that position is: 8
-</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
-[[fread()]] - Read bytes from a file, stream or socket
-[[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
-[[fclose()]] - Close a file, stream or socket
-[[unlink()]] - Delete a file

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