I have the following code snippet that put a stream (NDI) into WriteableBitmap ready to be displayed:
VideoBitmap = New WriteableBitmap(xres, yres, dpiX, 96.0, PixelFormats.Pbgra32, Nothing)
VideoBitmap.WritePixels(New Int32Rect(0, 0, xres, yres), videoFrame.p_data, bufferSize, stride)
It comes from a WPF project that I need to replicate in Windows Form. In the original one this Video Stream was displayed by VideoSurface.Source = VideoBitmap where VideoSurface was an Image component.
I've tried to display it with:
Dim videoImg As New Image
videoImg.Source = VideoBitmap
PictureBox1.BackgroundImage = videoImg
but the last line gives an error: Value of type 'Image' cannot be converted to 'Image'.
How can I figure out this in the best way?
Related
I am drawing an image on one of the PDF page.. when I use PDPageContentStream stream = new PDPageContentStream(doc, page); to draw image, everything works fine.. see below image.
but when I use constructor PDPageContentStream(doc, page, true, true); to create PDPageContentStream and draw image, the newly added image gets inverted upside down..
not getting what's going wrong here..
PS. I am using library PdfBox-Android
Use the constructor that has a fifth parameter, so to reset the graphic context.
public PDPageContentStream(PDDocument document, PDPage sourcePage, boolean appendContent,
boolean compress, boolean resetContext) throws IOException
alternatively, save and restore the graphics state in the first content stream by calling
saveGraphicsState();
// ...
restoreGraphicsState();
I need to extract an icon resource from a file. I have a structure (Resource) that contains the byte array, size, find handle, load handle, lock handle (from FindResource, LoadResource and LockResource, respectively).
I know that I need to obtain the Icon handle of my icon. Then I need to use GetIconInfo to retrieve the bit-mask. Then I use Image.FromHbitmap(h) to get an image. I then use the dimensions of the image as parameters to CreateIconFromResourceEx to retrieve a properly sized Icon.
Does anyone have some code to do this? I can declare all P/Invoke myself. Thanks!
My original code is returning a 32x32 every time.
Dim out As ICONINFO
Dim h As IntPtr = res.hLock
GetIconInfo(h, out)
Dim s As Image = Image.FromHbitmap(out.hbmMask)
h = ResourceExplorer.CreateIconFromResourceEx(res.bArray, res.hSize, True, &H30000, s.Width, s.Height, 0)
PictureBox1.Image = Icon.FromHandle(h).ToBitmap
I've been told that when I allow the user to create a video from within my app, a .jpg thumbnail image is supposed to be generated automatically. However, using windows phone power tools, I can see that only the video is generated, no image. Here is the code below:
EDIT: the QUESTION here, is HOW does one GET a thumbnail image from a given video that is saved in isolated storage?
' Set recording state: start recording.
Private Async Sub StartVideoRecording()
Try
App.ViewModel.IsDataLoaded = False
'isoStore = Await ApplicationData.Current.LocalFolder.GetFolderAsync("IsolatedStore")
strVideoName = GenerateVideoName()
isoFile = Await isoVideoFolder.CreateFileAsync(strVideoName, CreationCollisionOption.ReplaceExisting)
thisAccessStream = Await isoFile.OpenAsync(FileAccessMode.ReadWrite)
Await avDevice.StartRecordingToStreamAsync(thisAccessStream)
'save the name of the video file into the list of video files in isolated storage settings
Dim videoList As New List(Of InfoViewModel)
isoSettings = IsolatedStorageSettings.ApplicationSettings
If isoSettings.Contains("ListOfVideos") Then
videoList = isoSettings("ListOfVideos")
Else
isoSettings.Add("ListOfVideos", videoList)
End If
videoList.Add(New InfoViewModel With {.Name = strVideoName, .DateRecorded = Date.Now})
isoSettings("ListOfVideos") = videoList
isoSettings.Save()
isoSettings = Nothing
' Set the button states and the message.
UpdateUI(ButtonState.Recording, "Recording...")
Catch e As Exception
' If recording fails, display an error.
Me.Dispatcher.BeginInvoke(Sub() txtDebug.Text = "ERROR: " & e.Message.ToString())
End Try
End Sub
In Windows Phone 7.0 it wasn't possible using the "official" SDK to access the camera other than using CameraCaptureTask. But using Microsoft.Phone.InteropServices library it was possible to create a custom camera view in the application. If you used this VideoCamera class, it had an event called ThumbnailSavedToDisk, which might be what you have heard about. But apps using Microsoft.Phone.InteropServices was never allowed in the Windows Phone Marketplace. You can read more about it here.
To generate a thumbnail from a video file one solution would be to read up on how the MP4 file format works and extract one of the frames and use that as a thumbnail. Unfortunatly I haven't found any libraries that can do this.
Another, but far from optimal solution, would be to play the video in a MediaElement and then render that Control to a bitmap. This can be done with the following code (written in XAML/C#, I don't know VB.net, but should be easy to port):
<MediaElement
x:Name="VideoPlayer"
Width="640"
Height="480"
AutoPlay="True"
RenderTransformOrigin="0.5, 0.5"
VerticalAlignment="Center"
HorizontalAlignment="Center"
Stretch="Fill"
Canvas.Left="80"/>
And then to create the thumbnail:
// Set an event handler for when video has loaded
VideoPlayer.MediaOpened += VideoPlayer_MediaOpened;
// Read video from storage
IsolatedStorageFileStream videoFile = new IsolatedStorageFileStream("MyVideo.mp4", FileMode.Open, FileAccess.Read, IsolatedStorageFile.GetUserStoreForApplication());
VideoPlayer.SetSource(videoFile);
// Start playback
VideoPlayer.Play();
And then create the event handler which "captures" the thumbnail:
void VideoPlayer_MediaOpened(object sender, RoutedEventArgs e)
{
Thread.Sleep(100); // Wait for a short time to avoid black frame
WriteableBitmap wb = new WriteableBitmap(VideoPlayer, new TranslateTransform());
thumbnailImageHolder.Source = wb; // Setting it to a Image in the XAML code to see it
VideoPlayer.Stop();
}
Here is how it looks when using a modified version of the Video Recorder Sample. (The small image with the blue border in the upper right corner is the thumbnail of the recorded video. Behind is the camera Viewer.)
I am trying to change the Background of a button to an image source. I want to load that image in memory when we navigate to the page so that it doesn't flicker the first time it shows.
On Windows Phone, I was able to create the image source as such:
StreamResourceInfo resourceInfo = Application.GetResourceStream(uri);
BitmapImage bitmapSource = new BitmapImage();
// Avoid flicker by not delay-loading.
bitmapSource.CreateOptions = BitmapCreateOptions.None;
bitmapSource.SetSource(resourceInfo.Stream);
imageSource = bitmapSource;
I tried something similar in my Windows 8 Store app:
BitmapImage bitmapSource = new BitmapImage();
bitmapSource.CreateOptions = BitmapCreateOptions.None;
bitmapSource.UriSource = uri;
imageSource = bitmapSource;
but the same problem occurs. The button already has a different image as the Background, and on a certain event I would like it to change to the new background. But when I change the source, a noticeable flicker is observed. I'm assuming this is because the image is not yet in memory, as the issue goes away the second time the image source is modified.
Anyone know a solution? I need to somehow force the loading of this image.
Thanks!
If you use the SetSourceAsync method on the BitmapImage and await it before you attach it to the image source you should not see the flicker:-
// Ensure the stream is disposed once the image is loaded
using (IRandomAccessStream fileStream = await file.OpenAsync(Windows.Storage.FileAccessMode.Read))
{
// Set the image source to the selected bitmap
BitmapImage bitmapImage = new BitmapImage();
await bitmapImage.SetSourceAsync(fileStream);
imageSource = bitmapImage;
}
The MSDN docs have some more info on this
Thanks Ross, but what I ended up doing instead is I preloaded the half dozen or so bitmaps I needed by using similar code to what you had above, except from resource of course. I did this asynchronously when the page loaded, and then when I set the ImageSource on the button background, I used the already preloaded bitmaps. That way I know I'm not allocated a new chunk of memory for every instance of the bitmap.
I have a requirement to be be able to embed scanned tiff images into some SSRS reports.
When I design a report in VS2005 and add an image control the tiff image displays perfectly however when I build it. I get the warning :
Warning 2 [rsInvalidMIMEType] The value of the MIMEType property for the image ‘image1’ is “image/tiff”, which is not a valid MIMEType. c:\SSRSStuff\TestReport.rdl 0 0
and instead of an image I get the little red x.
Has anybody overcome this issue?
Assuming you're delivering the image file via IIS, use an ASP.NET page to change image formats and mime type to something that you can use.
Response.ContentType = "image/png";
Response.Clear();
using (Bitmap bmp = new Bitmap(tifFilepath))
bmp.Save(Response.OutputStream, ImageFormat.Png);
Response.End();
I have been goggling fora solution on how to display a TIFF image in a SSRS report but I couldn't find any and since SSRS doesn's support TIFF, I thought converting the TIFF to one of the suppported format will do the trick. And it did. I don't know if there are similar implementation like this out there, but I am just posting so others could benefit as well.
Note this only applies if you have a TIFF image saved on database.
Public Shared Function ToImage(ByVal imageBytes As Byte()) As Byte()
Dim ms As System.IO.MemoryStream = New System.IO.MemoryStream(imageBytes)
Dim os As System.IO.MemoryStream = New System.IO.MemoryStream()
Dim img As System.Drawing.Image = System.Drawing.Image.FromStream(ms)
img.Save(os, System.Drawing.Imaging.ImageFormat.Jpeg)
Return os.ToArray()
End Function
Here’s how you can use the code:
1. In the Report Properties, Select Refereneces, click add and browse System.Drawing, Version=2.0.0.0
2. Select the Code Property, Copy paste the function above
3. Click Ok
4. Drop an Image control from the toolbox
4.1. Right-Click the image and select Image Properties
4.2. Set the Image Source to Database
4.3. In the Use this field, Click expression and paste the code below
=Code.ToImage(Fields!FormImage.Value)
4.4. Set the appropriate Mime to Jpeg
Regards,
Fulbert
Thanks Peter your code didn't compile but the idea was sound.
Here is my attempt that works for me.
protected void Page_Load(object sender, EventArgs e)
{
Response.ContentType = "image/jpeg";
Response.Clear();
Bitmap bmp = new Bitmap(tifFileLocation);
bmp.Save(Response.OutputStream, ImageFormat.Jpeg);
Response.End();
}