C#

private void button1_Click(object sender, System.EventArgs e)
{
    int nOutNum;
    string NUM="1";
    nOutNum=short.Parse(NUM, NumberStyles.AllowHexSpecifier);
    NTPort.Outport(nAddress, (short)nOutNum);


}

<br />
IntPtr lpArray = CaptureAndFetch(); // Returns a HANDLE to a DIB<br />
IntPtr pDib = GlobalLock(lpArray);<br />
BITMAPINFO pbmi = (BITMAPINFO)Marshal.PtrToStructure(pDib, typeof(BITMAPINFO));  // Get pointer to the BITMAPINFO structure<br />
<br />
bitmap = new Bitmap(pbmi.bmiHeader.biWidth, pbmi.bmiHeader.biHeight, PixelFormat.Format24bppRgb);<br />
<br />
BitmapData bmData;	<br />
Rectangle rect = new Rectangle(0, 0, pbmi.bmiHeader.biWidth, pbmi.bmiHeader.biHeight );<br />
bmData = bitmap.LockBits(rect, ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb );<br />
<br />
GCHandle hSrc = GCHandle.Alloc(pDib, GCHandleType.Pinned ); // Get GCHandle to DIB<br />
IntPtr pBits = hSrc.AddrOfPinnedObject();<br />
<br />
// Now get location of bits. These are *after* the BITMAPINFO structure in a packed DIB<br />
Int32 pAddress = (Int32)pBits;<br />
// Add on length of structure...<br />
pAddress += Marshal.SizeOf(pbmi);<br />
pBits = (IntPtr)pAddress;<br />
<br />
GCHandle hDest = GCHandle.Alloc(bmData.Scan0, GCHandleType.Pinned);<br />
IntPtr pDest = hDest.AddrOfPinnedObject();<br />
<br />
int length = pbmi.bmiHeader.biHeight * bmData.Stride;<br />
<br />
// Copy the data from memory to the Scan0 property of our Bitmap<br />
byte databyte;<br />
for (int idx = 0; idx <= length; idx++)<br />
{<br />
	databyte = Marshal.ReadByte(pBits, idx); // CRASHES HERE AFTER 2000 loops!<br />
	Marshal.WriteByte(pDest, idx, databyte);<br />
}<br />
<br />
bitmap.UnlockBits( bmData );<br />
hSrc.Free();<br />
hDest.Free();<br />
GlobalUnlock(lpArray);<br />