C++ to C#

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From: Joey Wu (joeywu_at_ezmsg.com.tw)
Date: 06/26/04 

Date: Sat, 26 Jun 2004 18:51:48 +0800

Dear All.

I have a C++ application that can capture ccd image.
Now I tried to write a c# class to translate it then I can call from vb.net.
There is no any compiler error but it can`t return anything.
Please help and thanks a lot.

==========
C++ Sample
==========
#define VBUFSIZE 512*480*2
struct video_mmap
{
        DWORD frame; //Reserved, no use here
        WORD height,width; //specify the height and width to capture
        DWORD format; //RGB15 = 6 //rgb16 = 3
};
typedef struct Capture {
        BOOL Rflag, Wflag; //Reserved, not used.
        BYTE ioctlBUF[VBUFSIZE]; //capture buffer passed to driver, returned
with captured image data
} BTVCapture;

hFile = CreateFile(L"BTV0:", GENERIC_WRITE |GENERIC_READ, 0, NULL,
OPEN_EXISTING, 0, NULL);

int input;
input = 0;
DeviceIoControl(hFile, BT_IOCTL_INPUT, &input, sizeof(input), &tmp,
sizeof(tmp), NULL, NULL);
DeviceIoControl(hFile, VIDIOCSYNC, &vm, sizeof(vm), CAP.ioctlBUF,
sizeof(CAP.ioctlBUF), NULL, NULL);

===========
My C# Class
===========
 public class CCD
 {
  const int VBUFSIZE = 520*480*2;
  const int VIDIOCSYNC = 1026;
  const int BT_IOCTL_INPUT =1029;
  const int BT_IOCTL_BRIGHT =1030;
  const int BT_IOCTL_CONTRAST =103;

  struct video_mmap
  {
   public uint frame; //Reserved, no use here
   public ushort height,width; //specify the height and width to capture
   public uint format; //RGB15 = 6 //rgb16 = 3

   public video_mmap(int myFrame, int myHeight, int myWidth, int myFormat)
   {
    frame = System.Convert.ToUInt32(myFrame);
    height = System.Convert.ToUInt16(myHeight);
    width = System.Convert.ToUInt16(myWidth);
    format = System.Convert.ToUInt32(myFormat);
   }
  }

  [DllImport("coredll.dll", EntryPoint="DeviceIoControl",
SetLastError=true)]
  unsafe internal static extern int DeviceIoControl(
   IntPtr hDevice,
   int dwIoControlCode,
   void * lpInBuffer,
   int nInBufferSize,
   void * lpOutBuffer,
   int nOutBufferSize,
   string lpBytesReturned,
   string lpOverlapped);

  unsafe public static int sdCmd(IntPtr hDevice,int Channel)
  {
   int sChannel = Channel;
   IntPtr sDev = hDevice;
   int Ret;
   int tmp;
   Ret = DeviceIoControl(sDev, BT_IOCTL_INPUT, &sChannel, sizeof(int), &tmp,
sizeof(int), null, null);
   return Ret;
  }

  unsafe public static byte[] sdCmd(IntPtr hDevice, int Height, int Width)
  {
   video_mmap vm = new video_mmap(0, 240, 320, 3);

   byte[] myBuf = new byte[VBUFSIZE];
   fixed (void* p = myBuf)
   {
    DeviceIoControl(hDevice, VIDIOCSYNC, &vm, sizeof(video_mmap), p,
VBUFSIZE, null, null);
    return myBuf;
   }
  }
 }

==============
I call from vb.net
==============

Dim btvHandle As IntPtr = FileEx.CreateFile("BTV0:",
DirectCast(CType(Convert.ToUInt32(OpenNETCF.IO.FileAccess.All), Object),
OpenNETCF.IO.FileAccess), OpenNETCF.IO.FileShare.None,
FileCreateDisposition.OpenExisting, vbNullString)

Dim myCap As DeviceControl.CCD = New DeviceControl.CCD

        Try
            myCap.sdCmd(btvHandle, 0)
            Dim myPic As MemoryStream = New
MemoryStream(myCap.sdCmd(btvHandle, 240, 320))
            picRec.Image = New Bitmap(myPic)
        Catch ex As Exception
            MessageBox.Show(ex.ToString)
        End Try

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