Hey all i am trying to find a way to load an image via the WebClient using a WFP window.... The code below loads just fine when i am using a normal Windows Form:
Dim wc As New Net.WebClient
picNextTopic1.Image = Image.FromStream(wc.OpenRead(theAPI.ImgURL(2).Replace("{width}", "50").Replace("{height}", "50")))
However, this doesnt seem to work for WPF???
The WPF seems to use a .source for images? How can i convert that code above in order to use it with a WPF window?
WPF is not Windows Forms. You need to build WPF applications completely different. Properties, INotifyPropertyChanged etc.
But to your problem:
Dim wc As New WebClient()
Dim bytes = wc.DownloadData("http://....")
Dim ms = New MemoryStream(bytes)
Dim img = New BitmapImage()
ms.Seek(0, SeekOrigin.Begin)
img.BeginInit()
img.StreamSource = ms
img.EndInit()
picNextTopic1.Source = img
Related
I'm trying to use a RadDesktopAlert from Telerik and I need to set an Icon to it.
So, I did this :
Dim bi As New BitmapImage
bi.BeginInit()
bi.UriSource = New Uri("pack://application:,,,/Resources/questions1.png")
bi.EndInit()
alert.Icon = bi
alert.IconColumnWidth = 75
But my alert don't have any icon, it sounds like that it can't find the resource... Build action is set to "Resource" for my file.
Can I have help please ?
Thanks !
This should work, provided that the image file is in folder "Resources" in your Visual Studio project, and that its Build Action is set to Resource:
Dim bitmap As New BitmapImage(New Uri("pack://application:,,,/Resources/questions1.png"))
Dim image As New Image() With {.Source = bitmap}
alert.Icon = image
I just started working on an existing VB project where the end user wants the ability to print a WPF window as a full page to a printer. I found this code sample in C# and it worked just fine in C#
Printing WPF Window to Printer and Fit on a Page
However when I tried converting it to VB I am getting two errors
System.Drawing.Size cannot be converted to System.Windows.Size
System.Drawing.Point cannot be converted to System.Windows.Point
I sort of know what the difference in Drawing.Size and Windows.Size is based on this (and a couple of other) SO threads What is the difference between System.Drawing.Point and System.Windows.Point? but I cannot figure out how to modify my translation in a way that I can make the conversion happen in VB the way it works on C#. The errors appear on the Measure(sz) and the Arrange(new Rect(.....) lines.
What do I need to do to make this work?
Private Sub PrintWindow()
Dim printDlg As PrintDialog = New PrintDialog()
If printDlg.ShowDialog() = True Then
Dim capabilities As System.Printing.PrintCapabilities =
printDlg.PrintQueue.GetPrintCapabilities(printDlg.PrintTicket)
Dim scale As Double = Math.Min(capabilities.PageImageableArea.ExtentWidth / ActualWidth,
capabilities.PageImageableArea.ExtentHeight / ActualHeight)
LayoutTransform = New ScaleTransform(scale, scale)
Dim sz As New Size(CInt(capabilities.PageImageableArea.ExtentWidth),
CInt(capabilities.PageImageableArea.ExtentHeight))
Measure(sz)
Arrange(New Rect(New Point(CInt(capabilities.PageImageableArea.OriginWidth),
CInt(capabilities.PageImageableArea.OriginHeight)), sz))
printDlg.PrintVisual(Me, "First Fit to Page WPF Print")
End If
End Sub
Why not do something like this ?
Dim sz As New System.Windows.Size(CInt(capabilities.PageImageableArea.ExtentWidth),
CInt(capabilities.PageImageableArea.ExtentHeight))
Arrange(New Rect(New System.Windows.Point(CInt(capabilities.PageImageableArea.OriginWidth),
CInt(capabilities.PageImageableArea.OriginHeight)), sz))
here's the problem:
In my WPF application I used to load/parse my .xaml files using XamlReader.Load Method to open a window in my application.
Codefragment of my function which return the window:
Dim win As New Window()
Dim myObject As Object
Dim xml As XmlReader = XmlReader.Create("mysample.xaml")
myObject = System.Windows.Markup.XamlReader.Load(xml)
win = CType(myObject, Window)
Return win
I use this to display all my different windows the user wants to see.
I open the window with win.Show and close it, when user switch to another window with win.Close. It works well!
Now to increase the performance I plan to do all the XAMLReader.Load at Application Start and store the information into a Dictionary:
Private Shared windict As Dictionary(Of String, Object)
Public Shared Sub ConvertXAMLToWindow(ByVal formName As String)
windict = New Dictionary(Of String, Object)
Dim myObject As Object
Dim xml As XmlReader = XmlReader.Create(formName)
myObject = System.Windows.Markup.XamlReader.Load(xml)
windict.Add(formName, myObject)
End Sub
Then I want to use that information when calling windows:
If windict.ContainsKey(formName) Then
Dim win As New Window()
Dim myObject As Object
myObject = windict(formName)
win = CType(myObject, Window)
Return win
End If
Now
This works well, but when I use win.Close to close my window I get an error when trying to open it again with win.Show, although I create an new instance of Window?
System.InvalidOperationException
Cannot set Visibility or call Show, ShowDialog... after a Window has
closed.
But it works when I don't use the Dictionary Method but the XAMLReader.Load directly - any ideas whats going on ? Somehow the window I get by returning XamlReader.Load seems different than the stored information from the dict?? Am I missing somehting? Thanks in advance!
You could use Hide() instead of Close()
Hide hides the Form, so instead of disposing of the form (and its controls) you make it invisible. Show will make it visible again.
Be careful though, the form in the dictionary will still hold the state from the previous time it was used.
I've created some windows in wpf that I need to print to one xps document. Each window opens, loads the relevant data and then immediately closes. Currently I use the below code to create the xps:
Using doc = New XpsDocument(TempLoc, FileAccess.Write)
Dim writer = XpsDocument.CreateXpsDocumentWriter(doc)
Dim collator = writer.CreateVisualsCollator()
Dim Window1 As Window1 = New Window1()
Window1.ShowDialog()
Dim Window2 As Window2 = New Window2()
Window2.ShowDialog()
Dim WindowX As WindowX = New WindowX()
WindowX.ShowDialog()
collator.BeginBatchWrite()
collator.Write(Window1)
collator.Write(Window2)
collator.Write(WindowX)
collator.EndBatchWrite()
End Using
Dim doc2 = New XpsDocument(TempLoc, FileAccess.Read)
Dim seq = doc2.GetFixedDocumentSequence()
Dim window = New Window()
window.Content = New DocumentViewer() With {.Document = seq}
window.ShowDialog()
doc2.Close()
However the trouble with this approach is that the area printed varies between machines - I assume this is due to the local screen size being used etc.
Is it possible to make the program print the full window independent of the computer its on by modifying this code? Alternativly is there a better way to approach this problem?
Thanks for any help
I print with FixedDocuments by either appending or adding placed UIElements. I posted the full source code to my helper class here. You may find that breaking it down by UIElements gives you much better control over your exact printed output, though yes, it requires you to separate printing code instead of just emitting your window.
I've used this helper class to create some very nicely formated multi-page reports that always come out the same on every computer.
I want to render a viewport3d visual to an image using hardware rendering. How could I do that using SlimDX? I'm using WPF & VB.NET 4.0 and SlimDX. Any tips will help, thanks in advance. :)
Here is the code I use to render a viewport3d, it is very slow and gives bad results:
//rendering viewport3D to image
Dim viewportPlate As New RenderTargetBitmap(600, 600, 96 , 96 , PixelFormats.Pbgra32)
viewportPlate.Render(viewport3d)
//path to save
Dim path As String = imgSave
Dim fs As FileStream = New FileStream(path, FileMode.Create)
//encoding to PNG and saving
Dim encoder As BitmapEncoder = New PngBitmapEncoder()
encoder.Frames.Add(BitmapFrame.Create(viewportPlate))
encoder.Save(fs)
PS: If anyone has a better idea on how to do this using something other than SlimDX I will welcome those too...