private void btnCapture_Click(object sender, EventArgs e) { isg.GetConnectedMediaType(ref SGMediaType); VIDEOINFOHEADER vih = (VIDEOINFOHEADER)Marshal.PtrToStructure(SGMediaType.pbFormat, typeof(VIDEOINFOHEADER)); // Get a copy of the BITMAPINFOHEADER, to be used in the BITMAPFILEHEADER BITMAPINFOHEADER bih = vih.BitmapInfo; int len = (int)BitmapSize(bih); // Allocate bytes, plus room for a BitmapFileHeader int sizeOfBFH = Marshal.SizeOf(typeof(BITMAPFILEHEADER)); int sizeOfBIH = Marshal.SizeOf(typeof(BITMAPINFOHEADER)); IntPtr ptrBlock = Marshal.AllocCoTaskMem(len + sizeOfBFH + sizeOfBIH); IntPtr ptrBIH = new IntPtr(ptrBlock.ToInt64() + sizeOfBFH); IntPtr ptrImg = new IntPtr(ptrBlock.ToInt64() + sizeOfBFH + sizeOfBIH); try { // Get the DIB isg.GetCurrentBuffer(ref len, ptrImg); // Create header for a file of type .bmp BITMAPFILEHEADER bfh = new BITMAPFILEHEADER(); bfh.Type = (UInt16)((((byte)'M') << 8) | ((byte)'B')); bfh.Size = (uint)(len + sizeOfBFH + sizeOfBIH); bfh.Reserved1 = 0; bfh.Reserved2 = 0; bfh.OffBits = (uint)(sizeOfBFH + sizeOfBIH); // Copy the BFH into unmanaged memory, so that we can copy // everything into a managed byte array all at once Marshal.StructureToPtr(bfh, ptrBlock, false); Marshal.StructureToPtr(bih, ptrBIH, false); // Pull it out of unmanaged memory into a managed byte[] byte[] img = new byte[len + sizeOfBFH + sizeOfBIH]; Marshal.Copy(ptrBlock, img, 0, len + sizeOfBFH + sizeOfBIH); //System.IO.File.WriteAllBytes("cxp.bmp", img); System.IO.MemoryStream m = new System.IO.MemoryStream(img); this.m_Image = Image.FromStream(m); this.DialogResult = DialogResult.OK; } finally { // Free the unmanaged memory if (ptrBlock != IntPtr.Zero) { Marshal.FreeCoTaskMem(ptrBlock); } this.Close(); } }