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--- uphp:functions:fwrite_pack [2021/01/28 09:57]
admin
+++ uphp:functions:fwrite_pack [2021/09/13 05:57]
@@ Line 1: / Line 1: @@
-======fwrite_pack======
-<badge>WMMEGA FW >= 2.1179</badge>
-Write data from an indexed array in binary form (packed) to a file.
-====Description====
-<well size="sm"><html>
-<span style="font-size:125%;color:green">int
-<span style="color:black">fwrite_pack (
-<span style="color:green">int
-<span style="color:blue">$handle<span style="color:black">,
-<span style="color:green">indexed array
-<span style="color:blue">$array
-<span style="color:black">,
-<span style="color:green">int
-<span style="color:blue">$length<span style="color:black">
-)
-</html></well>
-This function performs a binary-safe write of array data.  The data type is determined by the indexed array definition and can be: BYTE, SHORT, INT or FLOAT.  This is an efficient way to write multiple binary bytes to a file in one go.
-====Parameters====
-<html><b><span style="color:blue">$handle<span style="color:black"></b></html>:  Valid handle of a previously opened file
-<html><b><span style="color:blue">$data<span style="color:black"></b></html>:  The indexed array data to be written.
-<html><b><span style="color:blue">$length<span style="color:black"></b></html>:  Number of elements to write (this will be multiplied by the array element size in byte which could be 1,2 or 4 depending on the data type)
-====Return Values====
-<html><b><span style="color:green">Integer<span style="color:black"></b></html> **number of bytes successfully written**
-====Examples====
-<code php>
-<?
-  $fh = fopen("/fwrite_test.txt","w");
-  if (!$fh) {
-    print("File open failed");
-  } else {
-    $arr=indexed_array(4,10);  // create array of 10 floats
-    for ($i=0;$i<sizeof($arr);$i++) {
-      $arr[$i]=$i;
-    }
-    fwrite_pack($fh,$arr,sizeof($arr)); // this will write 40 bytes (10 elements * 4 bytes)
-    fclose($fh);
-  }
-?>
-</code>
-====See Also====
-[[pack()]] - Pack data
-[[unpack()]] - Unpack data
-[[read_unpack()]] - Read binary data into an indexed array

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