Attempted to read or write protected memory. This is often an indication that other memory is corrupt.

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Hi friends,
i was using fingerprint reader in my application.i getting the fingerprint in image box.for some time the following exception occur how could i solve this. please help
execption:

Attempted to read or write protected memory. This is often an indication that other memory is corrupt.

this is the code where i get exception:

C#

protected override void WndProc(ref Message message)
     {
         try
         {
             switch (message.Msg)
             {
                 case Win32.WM_DEVICECHANGE: OnDeviceChange(ref message);
                 break;
             }
             if (message.Msg == (int)SGFPMMessages.DEV_AUTOONEVENT)
             {
                 if (message.WParam.ToInt32() == (Int32)SGFPMAutoOnEvent.FINGER_ON)
                 {
                     Int32 iError;
                     Byte[] fp_image;
                     Int32 img_qlty;
                     fp_image = new Byte[m_ImageWidth * m_ImageHeight];
                     img_qlty = 0;
                     iError = m_FPM.GetImage(fp_image);
                     m_FPM.GetImageQuality(m_ImageWidth, m_ImageHeight, fp_image, ref img_qlty);
                     if (iError == (Int32)SGFPMError.ERROR_NONE)
                     {
                         DrawImage(fp_image, pictureBoxR1);
                         iError = m_FPM.CreateTemplate(null, fp_image, m_RegMin1);
                         if (iError == (Int32)SGFPMError.ERROR_NONE)
                         {
                             lblmessage.Text = "Image for verification is captured";
                             btnconnect.Text = "Fingerprint Connected";
                             btnconnect.ForeColor = System.Drawing.Color.WhiteSmoke;
                             btnconnect.BackColor = System.Drawing.Color.MediumSeaGreen;
                             m_FPM.EnableAutoOnEvent(true, (int)this.Handle);
                             verification();
                         }
                         else
                         {
                             DisplayError("CreateTemplate()", iError);
                         }
                     }
                     else
                     {
                         DisplayError("GetImage()", iError);
                     }
                 }
                 else if (message.WParam.ToInt32() == (Int32)SGFPMAutoOnEvent.FINGER_OFF)
                 {
                     lblmessage.Text = "Device Message: Finger Off";
                 }
                 //m_RegMin1 = null;
             }
             base.WndProc(ref message);
         }
         catch(Exception ex)
         {
         }
     }

Posted 13-Feb-12 17:44pm

parithi vr

Updated 13-Feb-12 19:52pm

v2

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Comments

Sergey Alexandrovich Kryukov 14-Feb-12 0:37am

Isn't that obvious: there is no enough information?!
Please understand that we don't have access to your hard drive. Today I had a pretty difficult day, so my ability to read your mind is also a bit dull :-)

There are different ways to screw up thing; I cannot see which one you have chosen this time :-)
--SA

parithi vr 14-Feb-12 1:50am

ok this is the code

protected override void WndProc(ref Message message)
{
try
{
switch (message.Msg)
{
case Win32.WM_DEVICECHANGE: OnDeviceChange(ref message);
break;
}
if (message.Msg == (int)SGFPMMessages.DEV_AUTOONEVENT)
{
if (message.WParam.ToInt32() == (Int32)SGFPMAutoOnEvent.FINGER_ON)
{
Int32 iError;
Byte[] fp_image;
Int32 img_qlty;
fp_image = new Byte[m_ImageWidth * m_ImageHeight];
img_qlty = 0;
iError = m_FPM.GetImage(fp_image);
m_FPM.GetImageQuality(m_ImageWidth, m_ImageHeight, fp_image, ref img_qlty);
if (iError == (Int32)SGFPMError.ERROR_NONE)
{
DrawImage(fp_image, pictureBoxR1);
iError = m_FPM.CreateTemplate(null, fp_image, m_RegMin1);
if (iError == (Int32)SGFPMError.ERROR_NONE)
{
lblmessage.Text = "Image for verification is captured";
btnconnect.Text = "Fingerprint Connected";
btnconnect.ForeColor = System.Drawing.Color.WhiteSmoke;
btnconnect.BackColor = System.Drawing.Color.MediumSeaGreen;
m_FPM.EnableAutoOnEvent(true, (int)this.Handle);
verification();
}
else
{
DisplayError("CreateTemplate()", iError);
}
}
else
{
DisplayError("GetImage()", iError);
}
}
else if (message.WParam.ToInt32() == (Int32)SGFPMAutoOnEvent.FINGER_OFF)
{
lblmessage.Text = "Device Message: Finger Off";
}
//m_RegMin1 = null;
}
base.WndProc(ref message);
}
catch(Exception ex)
{
}
}

OriginalGriff 14-Feb-12 2:54am

Where is the error occuring?
Do you get a line reference, or have you added any tracing to try to narrow it down?

parithi vr 14-Feb-12 4:29am

error is in this line
iError = m_FPM.CreateTemplate(null, fp_image, m_RegMin1);
in the above code.

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OriginalGriff · Answer 1 · 2012-02-13T22:46:00

"error is in this line"

C#

iError = m_FPM.CreateTemplate(null, fp_image, m_RegMin1);

Then you need to look at what the method does - and in particular what parameters it is expecting, and what it will do with them.
We can't look at a method call to an unknown object (as in: we don't even know what class m_FPM is, let alone what it does) and say: "it's parameter 1, it should be 6 instead of null" - we don't know anything about the method.

Sorry, but we can't help you, based on that information!