saving a simple image

Question

I am trying to load an image as shown below:

 Dim openPicker As New FileOpenPicker
        openPicker.ViewMode = PickerViewMode.Thumbnail
        openPicker.SuggestedStartLocation = PickerLocationId.PicturesLibrary
        openPicker.FileTypeFilter.Add(".jpg")
        openPicker.FileTypeFilter.Add(".jpeg")
        openPicker.FileTypeFilter.Add(".png")
        Dim file As StorageFile = Await openPicker.PickSingleFileAsync
        If Nothing IsNot file Then
            Dim image As New BitmapImage()
            Dim stream = Await file.OpenAsync(Windows.Storage.FileAccessMode.Read)
            image.SetSource(stream)
            Image1.Source = image
            LayoutRoot.Visibility = Windows.UI.Xaml.Visibility.Collapsed
            txtImgdisplay.Text = file.Path
          Else
            txtImgdisplay.Text = "Invalid File"
        End If

And Now I have a button where I need to save the Image in that Image control to PicturesLibrary folder.

I am trying to do as shown below but it saves an empty Image:

 Dim fileSavePicker As New FileSavePicker()
        fileSavePicker.FileTypeChoices.Add("PNG", New String() {".png"})
        fileSavePicker.FileTypeChoices.Add("JPG", New String() {".jpg"})
        fileSavePicker.FileTypeChoices.Add("BMP", New String() {".bmp"})
        fileSavePicker.FileTypeChoices.Add("TIFF", New String() {".tiff"})
        fileSavePicker.FileTypeChoices.Add("EXIF", New String() {".exif"})
        fileSavePicker.FileTypeChoices.Add("ICO", New String() {".ico"})
        Dim saveFile As StorageFile = Await fileSavePicker.PickSaveFileAsync()

        If Nothing IsNot saveFile Then
            Dim image As New BitmapImage()
            Dim stream = Await StorageFile.GetFileFromPathAsync(txtImgdisplay.Text)
            LayoutRoot.Visibility = Windows.UI.Xaml.Visibility.Collapsed
            txtImgdisplay.Text = saveFile.Path
            Image1.Source = image
            Dim copyFile As StorageFile = Await saveFile.CopyAsync(Windows.Storage.KnownFolders.PicturesLibrary, "sample - Copy.png")
        Else
            txtImgdisplay.Text = "Invalid File"
        End If

So how can I do that?

---

kiran.

Answer 1

Kiran,

Didn't you intend to do:

file.CopyAndReplaceAsync(saveFile);

 file is the one that you picked with FileOpenPicker.

- ngm

Answer 2

Hi ngm011,

I have tried that and worked fine when it is inside button1_click but I need it within button2_click event.

---

kiran.

Answer 3

You will need to remember the file object that you want to copy so you can use it later. Instead of storing the "file" object returned from the FileOpenPicker as a local variable in button1_click, store it in a class variable so you can still use it in button2_click.

You can't read the pixels of the BitmapImage to save them out, so you need to remember what they were before they went in (or use a WriteableBitmap, but that is more complex and unnecessary if you don't need to change the pixels). The easiest way is to cache the StorageFile that was returned from the FileOpenPicker.

--Rob

Answer 4

Hi Rob,

Thanks for the explanation.But Still I am in dilemma how to use that can you show me some sample for that?

I need similarly to this sample.

---

kiran.