我希望能够拍照,显示并保留位置,以便将其保存到记录中,以便稍后显示。
我已经能够使用代码
显示它了BitmapImage bmp = newBitmapImage();
bmp.SetSource(e.ChosenPhoto);
myImage.Source = bmp2;
当myImage是正在显示的图像时,e是PhotoResult对象。但是,由于我需要将其保存在记录中,因此我尝试使用此代码根据位置显示照片。
string imageLoc = e.OriginalFileName;
Uri imageUri = new Uri(imageLoc, UriKind.Relative);
StreamResourceInfo resourceInfo = Application.GetResourceStream(imageUri);
BitmapImage bmp = BitmapImage();
bmp.SetSource(resourceInfo.Stream);
myImage.Source = bmp;
当我运行此代码时,我得到一个System.NullReferenceException。我假设它与Application.GetResourceStream有关,但我不确定出了什么问题。
为了澄清,我希望能够从诸如此类的位置加载和显示照片 'C:\ Data \ Users \ Public \ Pictures \ Camera Roll \ imageExample.jpg'
答案 0 :(得分:1)
如果要在Windows Phone设备中保存图像,则需要使用IsolatedStorage。 保存图片=>
String tempJPEG = "logo.jpg";
// Create virtual store and file stream. Check for duplicate tempJPEG files.
using (IsolatedStorageFile myIsolatedStorage = IsolatedStorageFile.GetUserStoreForApplication())
{
if (myIsolatedStorage.FileExists(tempJPEG))
{
myIsolatedStorage.DeleteFile(tempJPEG);
}
IsolatedStorageFileStream fileStream = myIsolatedStorage.CreateFile(tempJPEG);
StreamResourceInfo sri = null;
Uri uri = new Uri(tempJPEG, UriKind.Relative);
sri = Application.GetResourceStream(uri);
BitmapImage bitmap = new BitmapImage();
bitmap.SetSource(sri.Stream);
WriteableBitmap wb = new WriteableBitmap(bitmap);
// Encode WriteableBitmap object to a JPEG stream.
Extensions.SaveJpeg(wb, fileStream, wb.PixelWidth, wb.PixelHeight, 0, 85);
//wb.SaveJpeg(fileStream, wb.PixelWidth, wb.PixelHeight, 0, 85);
fileStream.Close();
}
阅读图片=>
BitmapImage bi = new BitmapImage();
using (IsolatedStorageFile myIsolatedStorage = IsolatedStorageFile.GetUserStoreForApplication())
{
using (IsolatedStorageFileStream fileStream = myIsolatedStorage.OpenFile("logo.jpg", FileMode.Open, FileAccess.Read))
{
bi.SetSource(fileStream);
this.img.Height = bi.PixelHeight;
this.img.Width = bi.PixelWidth;
}
}
this.img.Source = bi;
答案 1 :(得分:0)
如果您想从MediaLibrary(相机胶卷,已保存图片......)获取图片,那么您可以完成任务:
您的代码可以查找这样的示例(我已将其编辑为仅使用来自相机胶卷的图像):
您可以使用line picture获取图片流.GetImage() - 此方法返回Stream
,您可以使用它来复制到IsolatedStorage。
private void MyImg()
{
using (MediaLibrary mediaLibrary = new MediaLibrary())
foreach (PictureAlbum album in mediaLibrary.RootPictureAlbum.Albums)
{
if (album.Name == "Camera Roll")
{
PictureCollection pictures = album.Pictures;
foreach (Picture picture in pictures)
{
// example how to use it as BitmapImage
// BitmapImage image = new BitmapImage();
// image.SetSource(picture.GetImage());
// I've commented that above out, as you can get Memory Exception if
// you try to read all pictures to memory and not handle it properly.
// Example how to copy to IsolatedStorage
using (IsolatedStorageFile storage = IsolatedStorageFile.GetUserStoreForApplication())
{
if (!storage.DirectoryExists("SavedImg"))
storage.CreateDirectory("SavedImg");
if (storage.FileExists("SavedImg" + @"\" + picture.Name))
storage.DeleteFile("SavedImg" + @"\" + picture.Name);
using (IsolatedStorageFileStream file = storage.CreateFile("SavedImg" + @"\" + picture.Name))
picture.GetImage().CopyTo(file);
}
}
}
}
}