本机Windows Phone 8映像API
本文关键字:映像 API Phone Windows 本机 | 更新日期: 2023-09-27 18:29:25
我正在尝试实现一个Windows Phone 8应用程序,该应用程序可以更改锁屏图像。将图像写入隔离存储的部分代码如下:
private async void photoChooserTask_Completed(object sender, PhotoResult e)
{
if (e.TaskResult == TaskResult.OK)
{
using (IsolatedStorageFile store = IsolatedStorageFile.GetUserStoreForApplication())
{
store.Remove();
}
BitmapImage bi = new BitmapImage();
bi.SetSource(e.ChosenPhoto);
WriteableBitmap wb = new WriteableBitmap(bi);
byte[] buffer = null;
using (var ms = new System.IO.MemoryStream())
{
int quality = 80;
e.ChosenPhoto.Seek(0, SeekOrigin.Begin);
// TODO: Crop or rotate here if needed
wb.SaveJpeg(ms, wb.PixelWidth, wb.PixelHeight, 0, quality);
buffer = ms.ToArray();
}
var isoFolder = Windows.Storage.ApplicationData.Current.LocalFolder;
var nextImageName = Guid.NewGuid() + ".jpg";
var newImageFile = await isoFolder.CreateFileAsync(nextImageName, Windows.Storage.CreationCollisionOption.FailIfExists);
using (var wfs = await newImageFile.OpenStreamForWriteAsync())
{
wfs.Write(buffer, 0, buffer.Length);
}
Windows.Phone.System.UserProfile.LockScreen.SetImageUri(new Uri("ms-appdata:///Local/" + nextImageName, UriKind.Absolute));
MessageBox.Show("You have successfully set a new background");
}
}
在代码中间,您可以看到以下注释:
// TODO: Crop or rotate here if needed
我的问题是:
原生图像裁剪的代码是什么?(例如,当您通过本机Windows Phone锁屏设置为锁屏选择照片时,您会看到
如果您使用PhotoChooserTask
,您可以将所需值设置为PixelHeight
和PixelWidth
属性,它将自动显示本地图像裁剪页面:
photoChooser.PixelHeight = 500;
photoChooser.PixelWidth = 500;
但是,无法从其他地方打开它(即没有PhotoChooseTask
)。