A exception occurred when I calling the dll created inLabVIEW8.2 from my VB.NET 2005 application.

[leq_82]

Hello,

A exception occured when I calling the dll created inLabVIEW8.2 from  my VB.NET 2005 application.

The compiled DLL exports the follwing  function prototype:

void __stdcall Snap(LStrHandle *Path, LStrHandle *CameraName);

And my application program as following:

Imports System
Imports System.Runtime.InteropServices
Imports System.Windows.Forms
Imports NationalInstruments
Imports System.Threading

Public Class Form1

    Private StopAcquire As Boolean = True

    'This function definition was found from the header file of
    'SnapImage.dll, which is built in LabVIEW

    Private Declare Sub Snap Lib "E:\builds\Snap\SnapImage\SnapImage.dll" Alias "Snap" (ByVal Path As String, ByVal cameraName As String)

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        MsgBox("Welcome to use VS2005 and LabVIEW！", MsgBoxStyle.OkOnly + MsgBoxStyle.Information, "NI")
    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim Picture_Addr As String = "E:\MyPicture"
        Dim caremaName As String = ""
        StopAcquire = False
        While StopAcquire = False
            Snap(Picture_Addr, caremaName)        'Exception Occurred! Exception Information:Try to read or write the protected memory,this usually indicate  other  memories have 'been damaged.
            PictureBox1.Load(Picture_Addr)
            Label1.Text = caremaName
            Thread.Sleep(10)
        End While
    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        StopAcquire = True
    End Sub
End Class

Can anyone know what  the problem is?

Thanks in advance!

EnquanLi

China

my Email:leq_82@yahoo.com.cn

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