/// <summary>
/// Callback function for capture.
/// </summary>
/// <param name="hCapEngine"></param>
/// <param name="adapterIndex"></param>
/// <param name="callerContext"></param>
/// <param name="hRawFrame"></param>
private void CaptureCallBack(IntPtr hCapEngine, uint adapterIndex, IntPtr callerContext, IntPtr hRawFrame)
{
if (callerContext != IntPtr.Zero)
{
uint errno;
unsafe
{
uint frameLen = 0;
errno = NetmonAPI.NmGetRawFrameLength(hRawFrame, out frameLen);
if (errno != 0)
{
return;
}
byte[] frameBuf = new byte[CapturedFrameSize];
fixed(byte *pBuf = frameBuf)
{
if (frameLen >= CapturedFrameSize)
{
NM_TIME pTime = new NM_TIME();
//Get the TimeStamp of the frame for building the new shortened frame
errno = NetmonAPI.NmGetFrameTimeStampEx(hRawFrame, ref pTime);
if (errno != 0)
{
return;
}
uint captureSize = 0;
//use NmGetPartiaRawlFrame() to get the wanted length of the raw frame,
errno = NetmonAPI.NmGetPartialRawFrame(
hRawFrame,
0, //offset
CapturedFrameSize,
pBuf,
out captureSize
);
if (errno != 0)
{
return;
}
IntPtr hPartialRawFrame;
errno = NetmonAPI.NmBuildRawFrameFromBufferEx(
(IntPtr)pBuf,
CapturedFrameSize,
0, //media type, optional
ref pTime,
out hPartialRawFrame
);
if (errno != 0)
{
return;
}
NetmonAPI.NmAddFrame(callerContext, hPartialRawFrame);
}
else
{
NetmonAPI.NmAddFrame(callerContext, hRawFrame);
}
}
}
}
}