how to pass the value from one function to another function

• Wednesday, June 25, 2008 2:07 PM

   

   
  

  0
  Hi,
  
  In the Below code snippet i am getting an error saying that "Null reference Exception"
  at  line error = m_FPM.CreateTemplate(finger_info, fp_image, m_RegMin1);} when i keep a quick watch on m_RegMin1 , i am not able to get its value passed  from
  InitButton click function to Capture1 function. can somebody please let me know what shld i do . m_Regmin1 is initialized in InitButton function i need to get its value in the capture function.

  using System;

  using System.Collections;

  using System.ComponentModel;

  using System.Data;

  using System.Drawing;

  using System.Web;

  using System.Web.SessionState;

  using System.Web.UI;

  using System.Web.UI.WebControls;

  using System.Web.UI.HtmlControls;

  using System.IO;

  using SecuGen.FDxSDKPro.Windows;

  using System.Windows.Forms;

  namespace Sample

  {

  /// <summary>

  /// Summary description for WebForm1.

  /// </summary>

  public class Enroll : System.Web.UI.Page

  {

  private SGFingerPrintManager m_FPM;

  private Int32 m_ImageWidth;

  private Int32 m_ImageHeight;

  private Int32 m_Dpi;

  private SGFPMSecurityLevel m_SecurityLevel;

  private Byte[] m_RegMin1;

  private Byte[] m_RegMin2;

  private Byte[] m_VrfMin;

  private Byte[] m_StoredTemplate;

  protected System.Web.UI.WebControls.Button BtnCapture1;

  protected System.Web.UI.WebControls.Button BtnCapture2;

  protected System.Web.UI.WebControls.Image pictureBoxR1;

  protected System.Web.UI.WebControls.Image pictureBoxR2;

  protected System.Web.UI.WebControls.Button BtnRegister;

  protected System.Web.UI.WebControls.Label Label1;

  protected System.Web.UI.WebControls.DropDownList comboBoxDeviceName;

  protected System.Web.UI.WebControls.DropDownList comboBoxSelFinger;

  protected System.Web.UI.WebControls.Label Label2;

  protected System.Web.UI.WebControls.RadioButtonList groupBox4;

  protected System.Web.UI.WebControls.RadioButton[] m_RadioButton;

  protected System.Web.UI.WebControls.Label Label3;

  protected System.Web.UI.WebControls.RadioButton FPPosUnknown;

  protected System.Web.UI.WebControls.RadioButton FPPosLeftLittle;

  protected System.Web.UI.WebControls.RadioButton FPPosLeftIndex;

  protected System.Web.UI.WebControls.RadioButton FPPosLeftThumb;

  protected System.Web.UI.WebControls.RadioButton FPPosLeftMiddle;

  protected System.Web.UI.WebControls.RadioButton FPPosLeftRing;

  protected System.Web.UI.WebControls.RadioButton FPPosRightThumb;

  protected System.Web.UI.WebControls.RadioButton FPPosRightIndex;

  protected System.Web.UI.WebControls.RadioButton FPPosRightMiddle;

  protected System.Web.UI.WebControls.RadioButton FPPosRightRing;

  protected System.Web.UI.WebControls.RadioButton FPPosRightLittle;

  protected System.Web.UI.WebControls.Button InitBtn;

  private System.Windows.Forms.ProgressBar progressBar_R1;

  private System.Windows.Forms.ProgressBar progressBar_R2;

  static private bool   m_DeviceOpened;

  private FileStream inStream;

  private void Page_Load(object sender, System.EventArgs e)

  {

  // Put user code to initialize the page here

  EnableButtons(false);

  // Init Button

  m_RadioButton = new System.Web.UI.WebControls.RadioButton[11];

  m_RadioButton[0] = FPPosUnknown;

  m_RadioButton[1] = FPPosRightThumb;

  m_RadioButton[2] = FPPosRightIndex;

  m_RadioButton[3] = FPPosRightMiddle;

  m_RadioButton[4] = FPPosRightRing;

  m_RadioButton[5] = FPPosRightLittle;

  m_RadioButton[6] = FPPosLeftThumb;

  m_RadioButton[7] = FPPosLeftIndex;

  m_RadioButton[8] = FPPosLeftMiddle;

  m_RadioButton[9] = FPPosLeftRing;

  m_RadioButton[10] = FPPosLeftLittle;

  comboBoxDeviceName.SelectedIndex = 3;

  comboBoxSelFinger.SelectedIndex = 2;

  m_SecurityLevel = SGFPMSecurityLevel.NORMAL;

  m_StoredTemplate = null;

  m_ImageWidth = 260;

  m_ImageHeight = 300;

  m_Dpi = 500;

  if (!IsPostBack)

  {

  m_FPM = new SGFingerPrintManager();

  Session ["DEV"] = m_FPM;

  }

  else

  {

  m_FPM = Session["DEV"] as SGFingerPrintManager;

  }

  Label3.Text = "Click Init Button";

  }

  #region Web Form Designer generated code

  override protected void OnInit(EventArgs e)

  {

  //

  // CODEGEN: This call is required by the ASP.NET Web Form Designer.

  //

  InitializeComponent();

  base.OnInit(e);

  }

  /// <summary>

  /// Required method for Designer support - do not modify

  /// the contents of this method with the code editor.

  /// </summary>

  private void InitializeComponent()

  {

  this.BtnCapture1.Click += new System.EventHandler(this.BtnCapture1_Click);

  this.BtnCapture2.Click += new System.EventHandler(this.BtnCapture2_Click);

  this.BtnRegister.Click += new System.EventHandler(this.BtnRegister_Click);

  this.InitBtn.Click += new System.EventHandler(this.InitBtn_Click);

  this.Load += new System.EventHandler(this.Page_Load);

  }

  #endregion

  private  void InitBtn_Click(object sender, System.EventArgs e)

  {

  Int32 error;

  SGFPMDeviceName device_name = SGFPMDeviceName.DEV_UNKNOWN;

  Int32 device_id = (Int32)SGFPMPortAddr.USB_AUTO_DETECT;

  m_DeviceOpened = false;

  // Get device name

  if (comboBoxDeviceName.SelectedItem.Text == "USB FDU02")

  device_name = SGFPMDeviceName.DEV_FDU02;

  else if (comboBoxDeviceName.SelectedItem.Text == "USB FDU03")

  device_name = SGFPMDeviceName.DEV_FDU03;

  else if (comboBoxDeviceName.SelectedItem.Text == "USB FDU04")

  device_name = SGFPMDeviceName.DEV_FDU04;

  if (device_name !=  SGFPMDeviceName.DEV_UNKNOWN)

  error = m_FPM.Init(device_name);

  else

  error = m_FPM.InitEx(m_ImageWidth, m_ImageHeight, m_Dpi);

  if (error == (Int32)SGFPMError.ERROR_NONE)

  {

  SGFPMDeviceInfoParam pInfo = new SGFPMDeviceInfoParam();

  m_FPM.GetDeviceInfo(pInfo);

  m_ImageWidth = pInfo.ImageWidth;

  m_ImageHeight = pInfo.ImageHeight;

  EnableButtons(true);

  Label3.Text = "Initialization Success";

  }

  else

  {

  EnableButtons(false);

  Label3.Text = "Init() Error " + error;

  return;

  }

  // Set template format to ANSI 378

  error = m_FPM.SetTemplateFormat(SGFPMTemplateFormat.ANSI378);

  // Get Max template size

  Int32 max_template_size = 0;

  error = m_FPM.GetMaxTemplateSize(ref max_template_size);

  m_RegMin1 = new Byte[max_template_size];

  m_RegMin2 = new Byte[max_template_size];

  m_VrfMin  = new Byte[max_template_size];

  // OpenDevice if device is selected

  if (device_name != SGFPMDeviceName.DEV_UNKNOWN)

  {

  error = m_FPM.OpenDevice(device_id);

  if (error == (Int32)SGFPMError.ERROR_NONE)

  {

  m_DeviceOpened = true;

  }

  else

  {

  Label3.Text = "OpenDevice() Error : " + error;

  EnableButtons(false);

  }

  }

  }

  /////////////////////////////////////

  private void BtnCapture1_Click(object sender, System.EventArgs e)

  {

  try

  {

  Byte[] fp_image = new Byte[m_ImageWidth*m_ImageHeight];

  Int32 error = (Int32)SGFPMError.ERROR_NONE;

  Int32 img_qlty = 0;

  if(m_DeviceOpened)

  error = m_FPM.GetImage(fp_image);

  else

  error = GetImageFromFile(fp_image);

  if (error == (Int32)SGFPMError.ERROR_NONE)

  {

  m_FPM.GetImageQuality(m_ImageWidth, m_ImageHeight, fp_image, ref img_qlty);

  //progressBar_R1.Value = img_qlty;

  //DrawImage(fp_image);

  SGFPMFingerInfo finger_info = new SGFPMFingerInfo();

  finger_info.FingerNumber = (SGFPMFingerPosition)comboBoxSelFinger.SelectedIndex;

  finger_info.ImageQuality = (Int16)img_qlty;

  finger_info.ImpressionType = (Int16)SGFPMImpressionType.IMPTYPE_LP;

  finger_info.ViewNumber = 1;

  try{

  // CreateTemplate

  error = m_FPM.CreateTemplate(finger_info, fp_image, m_RegMin1);}

  catch(Exception ex)

  { Console.WriteLine(ex.ToString());}

  if (error == (Int32)SGFPMError.ERROR_NONE)

  {

  Label3.Text = "First image is captured";

  m_FPM.CloseDevice();

  }

  else

  Label3.Text = "GetMinutiae() Error : " + error;

  }

  else

  Label3.Text = "GetImage() Error : " + error;

  }

  catch(Exception ex)

  {

  Console.Write(ex.ToString());

  }

  finally

  {

  if (m_DeviceOpened) m_FPM.CloseDevice();

  m_DeviceOpened = false;

  }

  }

  }

  }

  
  

  • Moved by Peter RitchieMVP, Moderator Wednesday, June 25, 2008 2:13 PM off-topic
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