// Return picture segments for a complete picture
public static PicturePackage[] GetPicturePackages(string name, int id, Image picture, int segmentSize)
{
// save the picture in a byte array
MemoryStream stream = new MemoryStream();
picture.Save(stream, ImageFormat.Jpeg);
// Calculate the number of segments to split the picture
int numberSegments = (int)stream.Position / segmentSize + 1;
PicturePackage[] packages = new PicturePackage[numberSegments];
// Create the picture segments
int sourceIndex = 0;
for (int i = 0; i < numberSegments; i++)
{
// Calculate the size of the segment buffer
int bytesToCopy = (int)stream.Position - sourceIndex;
if (bytesToCopy > segmentSize)
{
bytesToCopy = segmentSize;
}
byte[] segmentBuffer = new byte[bytesToCopy];
Array.Copy(stream.GetBuffer(), sourceIndex, segmentBuffer, 0, bytesToCopy);
packages[i] = new PicturePackage(name, id, i + 1, numberSegments, segmentBuffer);
sourceIndex += bytesToCopy;
}
return(packages);
}
private void Listener()
{
while (!done)
{
IPEndPoint ep = null;
byte[] data = udpClient.Receive(ref ep);
PicturePackage package = new PicturePackage(encoding.GetString(data));
PicturePackage[] packages;
if (pictureArray.ContainsKey(package.Id))
{
packages = (PicturePackage[])pictureArray[package.Id];
packages[package.SegmentNumber - 1] = package;
}
else
{
packages = new PicturePackage[package.NumberOfSegments];
packages[package.SegmentNumber - 1] = package;
pictureArray.Add(package.Id, packages);
}
string message = "Received picture " + package.Id + " Segment " + package.SegmentNumber;
Invoke(new MethodInvokerString(SetStatusBar), new object[] { message });
// Check if all segments of a picture are received
int segmentCount = 0;
for (int i = 0; i < package.NumberOfSegments; i++)
{
if (packages[i] != null)
{
segmentCount++;
}
}
// All segments are received, so draw the picture
if (segmentCount == package.NumberOfSegments)
{
this.Invoke(new MethodInvokerInt(DisplayPicture), new object[] { package.Id });
}
}
}
