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POInconsistent Behavior From Declared DLL Function
 

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  1. POInconsistent Behavior From Declared DLL Function
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    <p>Why might my <code>GetRawData</code> declared function return a correct value when called from my VB.NET application, but return zero when called from my ASP.NET page?</p> <p>The code is exactly the same except for class type difference (Form / Page) and calling event handler (Form1_Load, Page_Load).</p> <p>Note: In the actual code, #DLL# and #RAWDATAFILE# are both absolute filenames to my DLL and raw data file respectively.</p> <p>Note: The DLL file was not created by Visual Studio.</p> <p><strong>Form1.vb</strong></p> <pre><code>Public Class Form1 Declare Auto Function GetRawData Lib "#DLL#" (ByVal filename() As Byte, _ ByVal byteArray() As Byte, _ ByVal length As Int32) As Int32 Private Sub Form1_Load(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles MyBase.Load Dim buffer(10485760) As Byte Dim msg As String, length As Integer = 10485760 Dim filename As String = "#RAWDATAFILE#" length = GetRawData(Encoding.Default.GetBytes(filename), buffer, length) </code></pre> <p><strong>Default.aspx.vb</strong></p> <pre><code>Partial Public Class _Default Inherits System.Web.UI.Page Declare Auto Function GetRawData Lib "#DLL#" (ByVal filename() As Byte, _ ByVal byteArray() As Byte, _ ByVal length As Int32) As Int32 Protected Sub Page_Load(ByVal sender As Object, _ ByVal e As System.EventArgs) Handles Me.Load Dim buffer(10485760) As Byte Dim msg As String, length As Integer = 10485760 Dim filename As String = "#RAWDATAFILE#" length = GetRawData(Encoding.Default.GetBytes(filename), buffer, length) </code></pre>
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    1. USSteven
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    1. COJust a hunch, but if you print out Encoding.Default.WebName - are they the same in both environments?
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    2. COYes, they are the same.
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      1. USSteven
 

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