C# Web Cam with Remoting - webcam

My project is about Remoting and i want to add a webcam component to it. Here it goes: I have 3 project in my solution... Client, Server, Remote.dll. In Remote.dll is a common class which has methods works in server machine. When i call these methods from Client it executes in server side. So now my question is i put the code of Webcam in remote.dll and it has an event called "video_NewFrame" which it works everytime when webcam catch an image. But i cant reach to the images from my Client side because when code drops to this event it executes infinitely
and my timer in Client side doesnt work as well. I tried to assing image to my global variable but whenever code goes to client and comes to Remote.dll again my variable is null...
How can i reach simultaneously captured images from my client? here is my code:
(i use AForge framework for webcam)
private bool DeviceExist = true;
private FilterInfoCollection videoDevices;
private VideoCaptureDevice videoSource = null;
public bool WebCamStart(int DeviceIndex)
{
if (DeviceExist)
{
videoDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice);
//string myDevice = videoDevices[0].Name;
videoSource = new VideoCaptureDevice(videoDevices[0].MonikerString);
videoSource.NewFrame += new NewFrameEventHandler(video_NewFrame);
CloseVideoSource();
videoSource.DesiredFrameSize = new Size(640, 480);
//videoSource.DesiredFrameRate = 10;
videoSource.Start();
return true;
}
else return false;
}
public Bitmap lastImg;
private void video_NewFrame(object sender, NewFrameEventArgs eventArgs)
{
Bitmap img = (Bitmap)eventArgs.Frame.Clone();
//in executes infinitely when execution comes here and i cant reach from Cliend side...
}
public string getFPS()
{
return videoSource.FramesReceived.ToString();
}
public void CloseVideoSource()
{
if (!(videoSource == null))
if (videoSource.IsRunning)
{
videoSource.SignalToStop();
videoSource.Stop();
videoSource = null;
}
}
public string getCamList()
{
string result = "No Device Found";
try
{
videoDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice);
//comboBox1.Items.Clear();
if (videoDevices.Count == 0)
throw new ApplicationException();
DeviceExist = true;
foreach (FilterInfo device in videoDevices)
{
//comboBox1.Items.Add(device.Name);
result = device.Name;
return result;
}
//comboBox1.SelectedIndex = 0; //make dafault to first cam
}
catch (ApplicationException)
{
DeviceExist = false;
//comboBox1.Items.Add("No capture device on your system");
return "No capture device on your system";
}
return result;
}
// and my client side...
private void timerWebCam_Tick(object sender, EventArgs e)
{
//lblFPS.Text ="Device Running... " + remObj.getFPS() + " FPS";
pictureBox1.Image = remObj.lastImg;
}

Related

How to set image.Source via async stream in an UWP application?

I want to set image.Source via async stream in an UWP application. Otherwise the image will flicker when switch to other image source.
My code is as below. And the log shows it works. Certainly I put 2 image files in the corresponding path before I test the demo code.
But in fact I did not see any picture shown, why?
Log:
111111111111 image file path = C:\Users\tomxu\AppData\Local\Packages\a0ca0192-f41a-43ca-a3eb-f128a29b00c6_1qkk468v8nmy0\LocalState\2.jpg
22222222222
33333333333333
4444444444444
The thread 0x6d38 has exited with code 0 (0x0).
The thread 0x6a34 has exited with code 0 (0x0).
111111111111 image file path = C:\Users\tomxu\AppData\Local\Packages\a0ca0192-f41a-43ca-a3eb-f128a29b00c6_1qkk468v8nmy0\LocalState\1.jpg
22222222222
33333333333333
4444444444444
Code:
private async void setImageSource(string imageFilePath)
{
StorageFile sFile = await StorageFile.GetFileFromPathAsync(imageFilePath);
Debug.WriteLine("111111111111 image file path = " + imageFilePath);
Stream fileStream = await sFile.OpenStreamForReadAsync();
Debug.WriteLine("22222222222");
InMemoryRandomAccessStream ras = new InMemoryRandomAccessStream();
Debug.WriteLine("33333333333333");
await fileStream.CopyToAsync(ras.AsStreamForRead());
Debug.WriteLine("4444444444444");
BitmapImage bi = new BitmapImage();
bi.SetSource(ras);
image1.Source = bi;
}
private async void Button_Click(object sender, RoutedEventArgs e)
{
string fullFolder = ApplicationData.Current.LocalFolder.Path;
if (count % 2 == 1)
{
setImageSource(fullFolder + #"\1.jpg");
//image1.Source = new BitmapImage(new Uri(#"ms-appx:///Assets/1.jpg"));
}
else
{
setImageSource(fullFolder + #"\2.jpg");
//image1.Source = new BitmapImage(new Uri(#"ms-appx:///Assets/2.jpg"));
}
count++;
}
Here is an example of how I convert a base64 image string to a BitmapImage..
var ims = new InMemoryRandomAccessStream();
var bytes = Convert.FromBase64String(base64String);
var dataWriter = new DataWriter(ims);
dataWriter.WriteBytes(bytes);
await dataWriter.StoreAsync();
ims.Seek(0);
var img = new BitmapImage();
img.SetSource(ims);
ims.Dispose();
return img;
Try some of the things I'm doing there. Like I notice your code is not setting the seek of the InMemoryReadAccessStream
For your question, I have something to clarify with you.
Your pictures are always in the application data folder. If you want to show it at runtime by programming, the easy way is using the ms-appdata URI scheme to refer to files that come from the app's local, roaming, and temporary data folders. Then, you could use this URL to initialize the BitmapImage object. With this way, you don't need to manually manipulate the file stream.
private void setImageSource(int i)
{
BitmapImage bi = new BitmapImage(new Uri("ms-appdata:///local/"+i+".png"));
image1.Source = bi;
}
private int count = 0;
private void Button_Click(object sender, RoutedEventArgs e)
{
if (count % 2 == 1)
{
setImageSource(1);
}
else
{
setImageSource(2);
}
count++;
}
If you say you have to manipulate the file stream to initialize the BitmaImage, then please add some break points to debug your code. If you add break points to check the InMemoryRandomAccessStream after call CopyToAsync method, you will see that its size is 0. It meant that the file stream has not been wrote to it. To solve this issue, you need to set a buffer size for it. Note: you used ras.AsStreamForRead() method, it's incorrect. You're writing stream to it, so you need to call ras.AsStreamForWrite().
The code looks like the following:
private async void setImageSource(string imageFilePath)
{
StorageFile sFile = await StorageFile.GetFileFromPathAsync(imageFilePath);
using (Stream fileStream = await sFile.OpenStreamForReadAsync())
{
using (InMemoryRandomAccessStream ras = new InMemoryRandomAccessStream())
{
await fileStream.CopyToAsync(ras.AsStreamForWrite((int)fileStream.Length));
ras.Seek(0);
BitmapImage bi = new BitmapImage();
bi.SetSource(ras);
img.Source = bi;
}
}
}
private int count = 0;
private void Button_Click(object sender, RoutedEventArgs e)
{
string fullFolder = ApplicationData.Current.LocalFolder.Path;
if (count % 2 == 1)
{
setImageSource(fullFolder + #"\1.jpg");
}
else
{
setImageSource(fullFolder + #"\2.jpg");
}
count++;
}
In addition, like #visc said, you need to call ras.Seek(0) method to reset the stream to beginning, else the image will not show there.

android media player connecting status with audio streaming link(ie 2%,4%...100% then online radio start to play) in android

how i get buffering status while media player trying to connect audio streaming link(ie 2%,4%...100% then online radio start to play) in android.
this is my code.
but i have no idea how i solve my problem.thanks is advance to any kind of help.
player.setOnBufferingUpdateListener(new OnBufferingUpdateListener() {
public void onBufferingUpdate(MediaPlayer mp, int percent) {
playSeekBar.setSecondaryProgress(percent);
Log.i("Buffering", "" + percent);
}
});
i solve this problem. here is the link. http://coderfriend.blogspot.com/
as per request here i share blog content..
when user click play button to play radio then i want to show connecting status(buffering 1%,2%.. 99%). when status will be 100% radio start to play. i was face problem to solve this. so here i share this code for all.
//at first create this class
public class StreamingMediaPlayer {
private static final int INTIAL_KB_BUFFER = 96*10/8;//assume 96kbps*10secs/8bits per byte
private TextView textStreamed;
private ImageButton playButton;
private ProgressBar progressBar;
// Track for display by progressBar
private long mediaLengthInKb, mediaLengthInSeconds;
private int totalKbRead = 0;
// Create Handler to call View updates on the main UI thread.
private final Handler handler = new Handler();
private MediaPlayer mediaPlayer;
private File downloadingMediaFile;
private boolean isInterrupted;
private Context context;
private int counter = 0;
public StreamingMediaPlayer(Context context,TextView textStreamed, ImageButton playButton, Button streamButton,ProgressBar progressBar)
{
this.context = context;
this.textStreamed = textStreamed;
this.playButton = playButton;
this.progressBar = progressBar;
}
/**
* Progressivly download the media to a temporary location and update the MediaPlayer as new content becomes available.
*/
public void startStreaming(final String mediaUrl, long mediaLengthInKb, long mediaLengthInSeconds) throws IOException {
this.mediaLengthInKb = mediaLengthInKb;
this.mediaLengthInSeconds = mediaLengthInSeconds;
Runnable r = new Runnable() {
public void run() {
try {
downloadAudioIncrement(mediaUrl);
} catch (IOException e) {
Log.e(getClass().getName(), "Unable to initialize the MediaPlayer for fileUrl=" + mediaUrl, e);
return;
}
}
};
new Thread(r).start();
}
/**
* Download the url stream to a temporary location and then call the setDataSource
* for that local file
*/
public void downloadAudioIncrement(String mediaUrl) throws IOException {
URLConnection cn = new URL(mediaUrl).openConnection();
cn.connect();
InputStream stream = cn.getInputStream();
if (stream == null) {
Log.e(getClass().getName(), "Unable to create InputStream for mediaUrl:" + mediaUrl);
}
downloadingMediaFile = new File(context.getCacheDir(),"downloadingMedia.dat");
if (downloadingMediaFile.exists()) {
downloadingMediaFile.delete();
}
FileOutputStream out = new FileOutputStream(downloadingMediaFile);
byte buf[] = new byte[16384];
int totalBytesRead = 0, incrementalBytesRead = 0;
do {
int numread = stream.read(buf);
if (numread <= 0)
break;
out.write(buf, 0, numread);
totalBytesRead += numread;
incrementalBytesRead += numread;
totalKbRead = totalBytesRead/1000;
testMediaBuffer();
fireDataLoadUpdate();
} while (validateNotInterrupted());
stream.close();
if (validateNotInterrupted()) {
fireDataFullyLoaded();
}
}
private boolean validateNotInterrupted() {
if (isInterrupted) {
if (mediaPlayer != null) {
mediaPlayer.pause();
//mediaPlayer.release();
}
return false;
} else {
return true;
}
}
/**
* Test whether we need to transfer buffered data to the MediaPlayer.
* Interacting with MediaPlayer on non-main UI thread can causes crashes to so perform this using a Handler.
*/
private void testMediaBuffer() {
Runnable updater = new Runnable() {
public void run() {
if (mediaPlayer == null) {
// Only create the MediaPlayer once we have the minimum buffered data
if ( totalKbRead >= INTIAL_KB_BUFFER) {
try {
startMediaPlayer();
} catch (Exception e) {
Log.e(getClass().getName(), "Error copying buffered conent.", e);
}
}
} else if ( mediaPlayer.getDuration() - mediaPlayer.getCurrentPosition() <= 1000 ){
// NOTE: The media player has stopped at the end so transfer any existing buffered data
// We test for < 1second of data because the media player can stop when there is still
// a few milliseconds of data left to play
transferBufferToMediaPlayer();
}
}
};
handler.post(updater);
}
private void startMediaPlayer() {
try {
File bufferedFile = new File(context.getCacheDir(),"playingMedia" + (counter++) + ".dat");
// We double buffer the data to avoid potential read/write errors that could happen if the
// download thread attempted to write at the same time the MediaPlayer was trying to read.
// For example, we can't guarantee that the MediaPlayer won't open a file for playing and leave it locked while
// the media is playing. This would permanently deadlock the file download. To avoid such a deadloack,
// we move the currently loaded data to a temporary buffer file that we start playing while the remaining
// data downloads.
moveFile(downloadingMediaFile,bufferedFile);
Log.e(getClass().getName(),"Buffered File path: " + bufferedFile.getAbsolutePath());
Log.e(getClass().getName(),"Buffered File length: " + bufferedFile.length()+"");
mediaPlayer = createMediaPlayer(bufferedFile);
// We have pre-loaded enough content and started the MediaPlayer so update the buttons & progress meters.
mediaPlayer.start();
startPlayProgressUpdater();
playButton.setEnabled(true);
} catch (IOException e) {
Log.e(getClass().getName(), "Error initializing the MediaPlayer.", e);
return;
}
}
private MediaPlayer createMediaPlayer(File mediaFile)
throws IOException {
MediaPlayer mPlayer = new MediaPlayer();
mPlayer.setOnErrorListener(
new MediaPlayer.OnErrorListener() {
public boolean onError(MediaPlayer mp, int what, int extra) {
Log.e(getClass().getName(), "Error in MediaPlayer: (" + what +") with extra (" +extra +")" );
return false;
}
});
// It appears that for security/permission reasons, it is better to pass a FileDescriptor rather than a direct path to the File.
// Also I have seen errors such as "PVMFErrNotSupported" and "Prepare failed.: status=0x1" if a file path String is passed to
// setDataSource(). So unless otherwise noted, we use a FileDescriptor here.
FileInputStream fis = new FileInputStream(mediaFile);
mPlayer.setDataSource(fis.getFD());
mPlayer.prepare();
return mPlayer;
}
/**
* Transfer buffered data to the MediaPlayer.
* NOTE: Interacting with a MediaPlayer on a non-main UI thread can cause thread-lock and crashes so
* this method should always be called using a Handler.
*/
private void transferBufferToMediaPlayer() {
try {
// First determine if we need to restart the player after transferring data...e.g. perhaps the user pressed pause
boolean wasPlaying = mediaPlayer.isPlaying();
int curPosition = mediaPlayer.getCurrentPosition();
// Copy the currently downloaded content to a new buffered File. Store the old File for deleting later.
File oldBufferedFile = new File(context.getCacheDir(),"playingMedia" + counter + ".dat");
File bufferedFile = new File(context.getCacheDir(),"playingMedia" + (counter++) + ".dat");
// This may be the last buffered File so ask that it be delete on exit. If it's already deleted, then this won't mean anything. If you want to
// keep and track fully downloaded files for later use, write caching code and please send me a copy.
bufferedFile.delete();
moveFile(downloadingMediaFile,bufferedFile);
// Pause the current player now as we are about to create and start a new one. So far (Android v1.5),
// this always happens so quickly that the user never realized we've stopped the player and started a new one
mediaPlayer.pause();
// Create a new MediaPlayer rather than try to re-prepare the prior one.
mediaPlayer = createMediaPlayer(bufferedFile);
mediaPlayer.seekTo(curPosition);
// Restart if at end of prior buffered content or mediaPlayer was previously playing.
// NOTE: We test for < 1second of data because the media player can stop when there is still
// a few milliseconds of data left to play
boolean atEndOfFile = mediaPlayer.getDuration() - mediaPlayer.getCurrentPosition() <= 1000;
if (wasPlaying || atEndOfFile){
mediaPlayer.start();
}
// Lastly delete the previously playing buffered File as it's no longer needed.
oldBufferedFile.delete();
}catch (Exception e) {
Log.e(getClass().getName(), "Error updating to newly loaded content.", e);
}
}
private void fireDataLoadUpdate() {
Runnable updater = new Runnable() {
public void run() {
if((totalKbRead>19)&&(totalKbRead<120))
textStreamed.setText((totalKbRead-19 + "% Buffering"));//show buffering status.. ie 1%,2%. in ui
else if(totalKbRead<19)
textStreamed.setText(("Connecting..."));
else
textStreamed.setText((""));
float loadProgress = ((float)totalKbRead/(float)mediaLengthInKb);
progressBar.setSecondaryProgress((int)(loadProgress*100));
}
};
handler.post(updater);
}
private void fireDataFullyLoaded() {
Runnable updater = new Runnable() {
public void run() {
transferBufferToMediaPlayer();
// Delete the downloaded File as it's now been transferred to the currently playing buffer file.
downloadingMediaFile.delete();
textStreamed.setText(("Audio full loaded: " + totalKbRead + " Kb read"));
}
};
handler.post(updater);
}
public MediaPlayer getMediaPlayer() {
return mediaPlayer;
}
public void startPlayProgressUpdater() {
float progress = (((float)mediaPlayer.getCurrentPosition()/1000)/mediaLengthInSeconds);
progressBar.setProgress((int)(progress*100));
if (mediaPlayer.isPlaying()) {
Runnable notification = new Runnable() {
public void run() {
startPlayProgressUpdater();
}
};
handler.postDelayed(notification,1000);
}
}
public void interrupt() {
playButton.setEnabled(false);
isInterrupted = true;
validateNotInterrupted();
}
/**
* Move the file in oldLocation to newLocation.
*/
public void moveFile(File oldLocation, File newLocation)
throws IOException {
if ( oldLocation.exists( )) {
BufferedInputStream reader = new BufferedInputStream( new FileInputStream(oldLocation) );
BufferedOutputStream writer = new BufferedOutputStream( new FileOutputStream(newLocation, false));
try {
byte[] buff = new byte[8192];
int numChars;
while ( (numChars = reader.read( buff, 0, buff.length ) ) != -1) {
writer.write( buff, 0, numChars );
}
} catch( IOException ex ) {
throw new IOException("IOException when transferring " + oldLocation.getPath() + " to " + newLocation.getPath());
} finally {
try {
if ( reader != null ){
writer.close();
reader.close();
}
} catch( IOException ex ){
Log.e(getClass().getName(),"Error closing files when transferring " + oldLocation.getPath() + " to " + newLocation.getPath() );
}
}
} else {
throw new IOException("Old location does not exist when transferring " + oldLocation.getPath() + " to " + newLocation.getPath() );
}
}
}
//now copy the below code in activity
StreamingMediaPlayer audioStreamer =
new StreamingMediaPlayer(this,textStreamed,playButton,
streamButton,progressBar);
audioStreamer.startStreaming("your streaming station name",5208, 216);
i think this helps you :)

Sharing video and photo in metro apps through share charm

i am trying to take a picture and video from within the app and trying to share it through share charm but i am having a problem doing that. After i take the pic ,the share charm says it has trouble sharing the image. This is my code .Can anybody please let me know what i am doing wrong.
namespace Temp
{
/// <summary>
/// An empty page that can be used on its own or navigated to within a Frame.
/// </summary>
public sealed partial class Page1 : Page
{
private StorageFile _photo; // Photo file to share
private StorageFile _video; // Video file to share
private async void OnCapturePhoto(object sender, TappedRoutedEventArgs e)
{
var camera = new CameraCaptureUI();
var file = await camera.CaptureFileAsync(CameraCaptureUIMode.Photo);
if (file != null)
{
_photo = file;
DataTransferManager.ShowShareUI();
}
}
private async void OnCaptureVideo(object sender, TappedRoutedEventArgs e)
{
var camera = new CameraCaptureUI();
camera.VideoSettings.Format = CameraCaptureUIVideoFormat.Wmv;
var file = await camera.CaptureFileAsync(CameraCaptureUIMode.Video);
if (file != null)
{
_video = file;
DataTransferManager.ShowShareUI();
}
}
void OnDataRequested(DataTransferManager sender, DataRequestedEventArgs args)
{
var request = args.Request;
if (_photo != null)
{
request.Data.Properties.Description = "Component photo";
var reference = Windows.Storage.Streams.RandomAccessStreamReference.CreateFromFile(_photo);
request.Data.Properties.Thumbnail = reference;
request.Data.SetBitmap(reference);
_photo = null;
}
else if (_video != null)
{
request.Data.Properties.Description = "Component video";
List<StorageFile> items = new List<StorageFile>();
items.Add(_video);
request.Data.SetStorageItems(items);
_video = null;
}
}
}
protected override void OnNavigatedTo(NavigationEventArgs e)
{
DataTransferManager.GetForCurrentView().DataRequested += OnDataRequested;
}
}
In order for your app to share, you must set the Title of the DataPackagePropertySet and at least one of the "SetXXX" methods. If you do not, you'll see the following message when trying to share "There was a problem with the data from ."
So add request.Data.Properties.Title = "Title_of_photo_or_video"; in OnDataRequested event.

C# COM Interop and Application.DoEvents()

I found the following code and am trying to implement it in a COM module:
public Bitmap GetThumbnail()
{
ThreadStart _threadstart = new ThreadStart(GenerateThumbnail);
Thread _thread = new Thread(_threadstart);
_thread.SetApartmentState(ApartmentState.STA);
_thread.Start();
_thread.Join();
return _image;
}
private void GenerateThumbnail()
{
WebBrowser _browser = new WebBrowser();
_browser.ScrollBarsEnabled = false;
_browser.ScriptErrorsSuppressed = true;
_browser.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(_browser_DocumentCompleted);
_browser.Navigate(_url);
while (_browser.ReadyState != WebBrowserReadyState.Complete)
{
Application.DoEvents();
}
_browser.Dispose();
}
void _browser_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
WebBrowser _browser = (WebBrowser)sender;
_browser.ClientSize = new Size(this._pagewidth, this._pageheight);
_browser.ScrollBarsEnabled = false;
_image = new Bitmap(_browser.Bounds.Width, _browser.Bounds.Height);
_browser.BringToFront();
_browser.DrawToBitmap(_image, _browser.Bounds);
if (_imageheight != 0 && _imagewidth != 0)
_image = (Bitmap)_image.GetThumbnailImage(_imagewidth, _imageheight, null, IntPtr.Zero);
}
However, I've discovered that the Application.DoEvents() and COM do not work together. The code works great in a C# application, but it hangs when called via COM. As you can tell, I'm trying to get a website thumbnail, and I can't seem to figure out a substitute for the DoEvents().
Any suggestions?
Thanks,
Kevin

Sharepoint 2010 Web Part Communication - How to make consumer wait for the provider

I have a series of web parts I need to implement in SharePoint 2010. The data provider web part uses an UpdatePanel and asynchronously makes a web service call which can potentially be slow. To keep it simple, I've put a single consumer web part on the page (Chart) which will use the consumer as its data provider.
My problem is that I can't get the consumer to wait for the provider - I get a variety of errors but all basically come back to "There is no data available". This may be because it is a Chart web part but the question also applies to the other custom parts I will be developing as they will pull the same data.
The question is: how do I either push data to my consumers when my provider is ready or somehow let them wait for my provider to have data (via polling or whatever).
Note: this is just a prototype, I haven't added error handling, etc yet.
Code is below:
[ToolboxItem(true)]
public partial class ClarityProjectGeneral : System.Web.UI.WebControls.WebParts.WebPart , IWebPartTable
{
public DataTable ProjectVitals = new DataTable(); For web part communication
// bunch of properties
protected override void OnInit(EventArgs e)
{
base.OnInit(e);
InitializeControl();
// For web part communication
// Initialize our datatable so the chart doesn't barf
DataColumn col = new DataColumn();
col.DataType = typeof(string);
col.ColumnName = "Name";
this.ProjectVitals.Columns.Add(col);
col = new DataColumn();
col.DataType = typeof(DateTime);
col.ColumnName = "Start";
this.ProjectVitals.Columns.Add(col);
col = new DataColumn();
col.DataType = typeof(DateTime);
col.ColumnName = "End";
this.ProjectVitals.Columns.Add(col);
}
protected void Page_Load(object sender, EventArgs e)
{
loading.Visible = true;
content.Visible = false;
}
public ClarityObjectClasses.Projects GetProject(string projectID)
{
Clarity.ClarityAbstractorProject ca = new Clarity.ClarityAbstractorProject(this.Username, this.Password);
Dictionary<string, string> queryParams = new Dictionary<string, string>();
queryParams.Add("projectID", projectID);
// Class for making web service call
ClarityObjectClasses.Projects response = new ClarityObjectClasses.Projects();
response = ca.GetProject(queryParams);
return response;
}
protected void Timer1_Tick(object sender, EventArgs e)
{
if (this.ProjectID == null || this.Username == null || this.Password == null)
{
lblConfigError.Visible = true;
lblConfigError.Text = "One or more required configuration values are not set. Please check the web part configuration.";
panelProjectDetails.Visible = false;
}
else
{
loading.Visible = true;
content.Visible = false;
panelProjectDetails.Visible = true;
ClarityObjectClasses.Projects projects = GetProject(this.ProjectID);
//Assign a bunch of values
// For web part communication
LoadTable(projects.Project[0]);
Timer1.Enabled = false;
loading.Visible = false;
content.Visible = true;
}
}
/* Interface functions for Graph Chart communication */
For web part communication
protected void LoadTable(ClarityObjectClasses.Project project)
{
DataRow row = ProjectVitals.NewRow();
row["Name"] = project.name;
row["Start"] = project.start;
row["End"] = project.finish;
this.ProjectVitals.Rows.Add(row);
}
public PropertyDescriptorCollection Schema
{
get
{
return TypeDescriptor.GetProperties(ProjectVitals.DefaultView[0]);
}
}
public void GetTableData(TableCallback callback)
{
callback(ProjectVitals.Rows);
}
public bool ConnectionPointEnabled
{
get
{
object o = ViewState["ConnectionPointEnabled"];
return (o != null) ? (bool)o : true;
}
set
{
ViewState["ConnectionPointEnabled"] = value;
}
}
[ConnectionProvider("Table", typeof(TableProviderConnectionPoint), AllowsMultipleConnections = true)]
public IWebPartTable GetConnectionInterface()
{
return this;
}
public class TableProviderConnectionPoint : ProviderConnectionPoint
{
public TableProviderConnectionPoint(MethodInfo callbackMethod, Type interfaceType, Type controlType, string name, string id, bool allowsMultipleConnections)
: base(callbackMethod, interfaceType, controlType, name, id, allowsMultipleConnections)
{
}
public override bool GetEnabled(Control control)
{
return ((ClarityProjectGeneral)control).ConnectionPointEnabled;
}
}
}
Do not quite understand, but if it helps
You may not use "connectable" web-parts inside UpdatePanel,
because of lack of corresponding events to bind data on asynchronous callback.
I just stumbled across this. I had exactly the same problem trying to implement a custom webpart just as a proof to myself. I applied filters to both my webpart and a list, and then let a chart consume them. What I found was that my webpart sent the wrong data, but the list webpart worked as expected.
So I reflected the XsltListViewWebPart (or whatever it's exact name is) and I discovered that there is an IConnectionData interface. This allows you to specify the dependencies and get the correct delay binding you need. GetRequiresData indicates that there are still more connections to be consumed before the data can be requested.