圖片保存在 Windows Store App

Question

我有兩個按鈕和一個圖像控件。

現在，當我單擊第一個按鈕時，我正在嘗試加載圖像，如下所示。

 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

現在，當我單擊第二個按鈕時，我需要在對同一圖像進行一些修改后將該圖像保存到圖片庫中。

這就是我正在嘗試做的事情，並且對如何獲取已經加載到圖像控件中的圖像並保存它感到困惑。

 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

Answer 1

我相信你需要做的就是調用bitmap object的Save方法。

image.Save(pathToPictureFolder & filename)

Answer 2

嘗試如下。 1）將選定的文件（StorageFile）存儲為成員變量。 2) 單擊第二個按鈕時。

文件夾選擇器 saveFolder = new FolderPicker();
saveFolder.SuggestedStartLocation = PickerLocationId.Desktop;
saveFolder.FileTypeFilter.Add("*"); StorageFolder storagefolderSave = await saveFolder.PickSingleFolderAsync(); StorageFile storagefileSave = [selected storagefile as member variable] await storagefileSave.CopyAsync(storagefolderSave, storagefileSave.Name, NameCollisionOption.ReplaceExisting);