wpf 如何使用 JpegBitmapEncoder 保存图像
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How to save image using JpegBitmapEncoder
提问by Hymannad
According to the image encoding example hereI should be able to use JpegBitmapEncoderto encode an image for saving as a jpeg file but get this compile error:
根据这里的图像编码示例，我应该能够使用JpegBitmapEncoder对图像进行编码以保存为 jpeg 文件，但出现此编译错误：
error CS1503: Argument 1: cannot convert from 'System.Windows.Controls.Image' to 'System.Uri'
错误 CS1503：参数 1：无法从“System.Windows.Controls.Image”转换为“System.Uri”
I don't see a way (property or method in Image) to get System.Urifrom Image.
What am I missing?
我没有看到System.Uri从 Image 中获取的方法（Image 中的属性或方法）。我错过了什么？
The Image xaml code is
图像 xaml 代码是
<Image Name="ColorImage"/>
The SaveImage C# is
SaveImage C# 是
...
SaveImage(ColorImage, path);
...
private void SaveImage(Image image, string path)
{
var jpegEncoder = new JpegBitmapEncoder();
jpegEncoder.Frames.Add(BitmapFrame.Create(image));
using (var fs = new FileStream(path, FileMode.Create, FileAccess.Write))
{
jpegEncoder.Save(fs);
}
}
The code below (taken mostly from the kinect-sdk) streams 640 x 480 RBG to a WriteableBitmapat 30 Fps (the kinect ColorImageFormatis RgbResolution640x480Fps30).
下面的代码（从大多采取的kinect-SDK）流640×480 RBG到WriteableBitmap的以30fps（Kinect的ColorImageFormat是RgbResolution640x480Fps30）。
using (var colorImageFrame = allFramesReadyEventArgs.OpenColorImageFrame())
{
if (colorImageFrame == null) return;
var haveNewFormat = currentColorImageFormat != colorImageFrame.Format;
if (haveNewFormat)
{
currentColorImageFormat = colorImageFrame.Format;
colorImageData = new byte[colorImageFrame.PixelDataLength];
colorImageWritableBitmap = new WriteableBitmap(
colorImageFrame.Width,
colorImageFrame.Height, 96, 96, PixelFormats.Bgr32, null);
ColorImage.Source = colorImageWritableBitmap;
}
// Make a copy of the color frame for displaying.
colorImageFrame.CopyPixelDataTo(colorImageData);
colorImageWritableBitmap.WritePixels(
new Int32Rect(0, 0, colorImageFrame.Width, colorImageFrame.Height),
colorImageData,
colorImageFrame.Width*Bgr32BytesPerPixel,
0);
}
回答by Hymannad
private void SaveImage(string path)
{
var jpegEncoder = new JpegBitmapEncoder();
jpegEncoder.Frames.Add(BitmapFrame.Create(colorImageWritableBitmap));
using (var fs = new FileStream(path, FileMode.Create, FileAccess.Write))
{
jpegEncoder.Save(fs);
}
}
回答by Romano Zumbé
The problem occurs, because you pass an Imageto BitmapFrame.Create. Imageis more common in Windows Forms. A simple approach would be to create a MemoryStreamfirst and the pass this:
出现问题，因为您传递了一个Imageto BitmapFrame.Create。Image在 Windows 窗体中更常见。一个简单的方法是创建MemoryStream第一个并传递：
private void SaveImage(Image image, string path)
{
MemoryStream ms = new MemoryStream();
image.Save(ms,System.Drawing.Imaging.ImageFormat.Jpeg);
var jpegEncoder = new JpegBitmapEncoder();
jpegEncoder.Frames.Add(BitmapFrame.Create(ms));
using (var fs = new FileStream(path, FileMode.Create, FileAccess.Write))
{
jpegEncoder.Save(fs);
}
}
Addition (see conversation in comments):
添加（见评论中的对话）：
you could try to use the CopyPixelsmethod on the writeableBitmap object and copy the pixels to a byte array which you load to a MemoryStreamand the write it to a Jpeg File withe the JpegBitmapEncoder. But it's just a guess.
您可以尝试CopyPixels在 writeableBitmap 对象上使用该方法，并将像素复制到您加载到 a 的字节数组中，MemoryStream然后将其写入带有JpegBitmapEncoder. 但这只是一个猜测。
This could work, too:
这也可以：
private void SaveImage (WriteableBitmap img, string path)
{
FileStream stream = new FileStream(path, FileMode.Create);
JpegBitmapEncoder encoder = new JpegBitmapEncoder();
encoder.Frames.Add(BitmapFrame.Create(img));
encoder.Save(stream);
stream.Close();
}
You will just have to extract the WriteableBitmap from your Image control
您只需从 Image 控件中提取 WriteableBitmap
回答by jlew
Try: BitmapFrame.Create(image.Source)
尝试： BitmapFrame.Create(image.Source)
