Capturar Imagem da WebCam

WiaClass wiaManager = null; // WIA manager COM object
CollectionClass wiaDevs = null; // WIA devices collection COM object
ItemClass wiaRoot = null; // WIA root device COM object
CollectionClass wiaPics = null; // WIA collection COM object
ItemClass wiaItem = null; // WIA image COM object

try
{
wiaManager = new WiaClass(); // create COM instance of WIA manager

wiaDevs = wiaManager.Devices as CollectionClass; // call Wia.Devices to get all devices
if ((wiaDevs == null) || (wiaDevs.Count == 0))
{
MessageBox.Show(this, "No WIA devices found!", "WIA", MessageBoxButtons.OK, MessageBoxIcon.Stop);
Application.Exit();
return;
}

object selectUsingUI = System.Reflection.Missing.Value; // = Nothing
wiaRoot = (ItemClass)wiaManager.Create(ref selectUsingUI); // let user select device
if (wiaRoot == null) // nothing to do
return;

// this call shows the common WIA dialog to let the user select a picture:
wiaPics = wiaRoot.GetItemsFromUI(WiaFlag.SingleImage, WiaIntent.ImageTypeColor) as CollectionClass;
if (wiaPics == null)
return;

bool takeFirst = true; // this sample uses only one single picture
foreach (object wiaObj in wiaPics) // enumerate all the pictures the user selected
{
if (takeFirst)
{
DisposeImage(); // remove previous picture
wiaItem = (ItemClass)Marshal.CreateWrapperOfType(wiaObj, typeof(ItemClass));
imageFileName = Path.GetTempFileName(); // create temporary file for image
Cursor.Current = Cursors.WaitCursor; // could take some time
this.Refresh();
wiaItem.Transfer(imageFileName, false); // transfer picture to our temporary file
picCapture.Image = Image.FromFile(imageFileName); // create Image instance from file
takeFirst = false; // first and only one done.
}
Marshal.ReleaseComObject(wiaObj); // release enumerated COM object
}
}
catch (Exception ee)
{
MessageBox.Show(this, "Acquire from WIA Imaging failed\r\n" + ee.Message, "WIA", MessageBoxButtons.OK, MessageBoxIcon.Stop);
Application.Exit();
}
finally
{
if (wiaItem != null)
Marshal.ReleaseComObject(wiaItem); // release WIA image COM object
if (wiaPics != null)
Marshal.ReleaseComObject(wiaPics); // release WIA collection COM object
if (wiaRoot != null)
Marshal.ReleaseComObject(wiaRoot); // release WIA root device COM object
if (wiaDevs != null)
Marshal.ReleaseComObject(wiaDevs); // release WIA devices collection COM object
if (wiaManager != null)
Marshal.ReleaseComObject(wiaManager); // release WIA manager COM object
Cursor.Current = Cursors.Default; // restore cursor
}

}
private void DisposeImage()
{
Image oldImg = picCapture.Image;
picCapture.Image = null; // empty picture box
if (oldImg != null)
oldImg.Dispose(); // dispose old image (free memory, unlock file)

}