保存从Windows商店应用画布图像文件 [英] Save canvas from windows store app as image file
本文介绍了保存从Windows商店应用画布图像文件的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我正在寻找方法来保存从Windows商店应用的画布,我发现:
I'm looking for way to save canvas from windows store app, I have found:
private void CreateSaveBitmap(Canvas canvas, string filename)
{
RenderTargetBitmap renderBitmap = new RenderTargetBitmap(
(int)canvas.Width, (int)canvas.Height,
96d, 96d, PixelFormats.Pbgra32);
// needed otherwise the image output is black
canvas.Measure(new Size((int)canvas.Width, (int)canvas.Height));
canvas.Arrange(new Rect(new Size((int)canvas.Width, (int)canvas.Height)));
renderBitmap.Render(canvas);
//JpegBitmapEncoder encoder = new JpegBitmapEncoder();
PngBitmapEncoder encoder = new PngBitmapEncoder();
encoder.Frames.Add(BitmapFrame.Create(renderBitmap));
using (FileStream file = File.Create(filename))
{
encoder.Save(file);
}
}
不过,该方法将无法在Windows商店应用工作(有没有5参数的构造函数 RenderTargetBitmap
没有 PngBitmapEncoder
)。所以我的问题是我怎么可以从Windows商店应用的画布保存为某种图像文件(JPG,PNG等)有没有办法做到这一点?
But that method won't work in windows store app (there is no 5 argument constructor for RenderTargetBitmap
no PngBitmapEncoder
). So my question is how can I save canvas from windows store app as some kind of image file (jpg, png, etc.) is there any way to do this?
推荐答案
使用System.Runtime.InteropServices.WindowsRuntime
$ b
Try this
using System.Runtime.InteropServices.WindowsRuntime
private async Task CreateSaveBitmapAsync(Canvas canvas)
{
if (canvas != null)
{
RenderTargetBitmap renderTargetBitmap = new RenderTargetBitmap();
await renderTargetBitmap.RenderAsync(canvas);
var picker = new FileSavePicker();
picker.FileTypeChoices.Add("JPEG Image", new string[] { ".jpg" });
StorageFile file = await picker.PickSaveFileAsync();
if (file != null)
{
var pixels = await renderTargetBitmap.GetPixelsAsync();
using (IRandomAccessStream stream = await file.OpenAsync(FileAccessMode.ReadWrite))
{
var encoder = await
BitmapEncoder.CreateAsync(BitmapEncoder.JpegEncoderId, stream);
byte[] bytes = pixels.ToArray();
encoder.SetPixelData(BitmapPixelFormat.Bgra8,
BitmapAlphaMode.Ignore,
(uint)canvas.Width, (uint)canvas.Height,
96, 96, bytes);
await encoder.FlushAsync();
}
}
}
}
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