Latch up to the liberated behavior

Behavior behavior latch - until the-released from switches seems a little strange to me, and I was wondering if anyone could shed some light on a question I have on this subject.

As a quick experiment, I created a very simple VI containing only a while loop with a structure of the event, some controls Boolean latch - until the released and digital indicator.

What I expected was that the display will show '1' and '2' then one of these Boolean controls was depressed after having released it. What I found, it was that it displays "2" after pressing the button, but stayed like that after it freeing.

Using the window Inspector events, I checked that the occurrence of the event was made to fire when I pressed the button and when I got out, but in both cases, it seems to be reading the key as 'true '. I find that really odd - would be unwise for the button to read also true in a case and false in the other?

To get the expected behavior, I had to do something very ugly:

Since the button seems to be in the same condition in the two executions of the case, has no way to distinguish between the press and release of the events except keeping the external State to the structure of the event. My question is basically: why LabVIEW developers have chosen to design it this way? What is the logic behind this?

In the structure of your event, you have an OLD VALUE and NEW VALUE provided to you.  You can do meaningful with those if you need to distinguish further the transition.

Consider simply using the SWITCH up PUBLISHED mechanical action,

Which generates a VALUE CHANGE event on the press and a VALUE CHANGE event on the release.  The NEW VALUE allows you to distinguish which.

Tags: NI Software

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    I deleted as much white space before the header() function and I still get the error.

    <? php require_once('.. / Connections/Old4thDB.php');? >

    <? PHP

    If (! function_exists ("GetSQLValueString")) {}

    function GetSQLValueString ($theValue, $theType, $theDefinedValue = "", $theNotDefinedValue = "")

    {

    If (via PHP_VERSION < 6) {}

    $theValue = get_magic_quotes_gpc()? stripslashes ($TheValue): $theValue;

    }

    $theValue = function_exists ("mysql_real_escape_string")? mysql_real_escape_string ($TheValue): mysql_escape_string ($theValue);

    Switch ($theType) {}

    case 'text ':

    $theValue = ($theValue! = "")? « " ». $theValue. "" "": "NULL";

    break;

    case "long":

    case "int":

    $theValue = ($theValue! = "")? intval ($TheValue): 'NULL ';

    break;

    case "double":

    $theValue = ($theValue! = "")? doubleVal ($TheValue): 'NULL ';

    break;

    case "date":

    $theValue = ($theValue! = "")? « " ». $theValue. "" "": "NULL";

    break;

    case "set":

    $theValue = ($theValue! = "")? $theDefinedValue: $theNotDefinedValue;

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    }

    Return $theValue;

    }

    }

    $editFormAction = $_SERVER ['PHP_SELF'];

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    $editFormAction. = « ? ». htmlentities($_SERVER['QUERY_STRING']);

    }

    If ((isset($_POST["MM_update"])) & & ($_POST ["MM_update"] == "UpdateVarietyForm")) {}

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    GetSQLValueString ($_POST ['varietyName'], "text").

    GetSQLValueString ($_POST ['varietyType'], "text").

    GetSQLValueString ($_POST ['varietyAlphaAcidGeneral'], "text").

    GetSQLValueString ($_POST ['varietyBetaAcidGeneral'], "text").

    GetSQLValueString ($_POST ['varietyOld4thAA'], "text").

    GetSQLValueString ($_POST ['varietyOld4thBA'], "text").

    GetSQLValueString ($_POST ['varietyEssenOil1'], "text").

    GetSQLValueString ($_POST ['varietyEssenOil2'], "text").

    GetSQLValueString ($_POST ['varietyEssenOil3'], "text").

    GetSQLValueString ($_POST ['varietyEssenOil4'], "text").

    GetSQLValueString ($_POST ['varietyEssenOil5'], "text").

    GetSQLValueString ($_POST ['varietyEssenOil6'], "text").

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    $Result1 = mysql_query ($updateSQL, $Old4thDB) or die (mysql_error ());

    $updateGoTo = "varieties.php";

    If (isset {}

    $updateGoTo. = (strpos ($updateGoTo, '?'))? « & » : « ? » ;

    $updateGoTo. = $_SERVER ['QUERY_STRING'];

    }

    header (sprintf ("location: %s", $updateGoTo));

    }

    @mysql_select_db ($database_Old4thDB, $Old4thDB);

    $query_rsUpdateVariety = "SELECT * FROM variety";

    $rsUpdateVariety = mysql_query ($query_rsUpdateVariety, $Old4thDB) or die (mysql_error ());

    $row_rsUpdateVariety = mysql_fetch_assoc ($rsUpdateVariety);

    $totalRows_rsUpdateVariety = mysql_num_rows ($rsUpdateVariety);

    ? >

    Am I missing other setups/configurations that could cause this?

    You forgot the most important part of the error message. "Output started at..." tells you where the production has started, guiding you to correct the error.

    The most common cause of this error is a space outside of an include file PHP tags. Most likely guilty is one or more new lines after the closing PHP tag in Old4thDB.php. Remove the closing tag PHP in this folder will be probably solved the problem.

    Another possible cause is using the BOM (byte order mark) on a PHP page. Make sure that the check box for the BOM is deselected in the Save dialog box.

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