c# - 在 C# 中使用 imagick 将 .HEIC 转换为 JPEG

Question

我在将 heic 文件转换为 jpeg 时遇到问题

我已经尝试在网上搜索它，我可以找到如何写入文件夹但不知道如何获取转换文件的字节 [] 以便我可以保存它

       byte[] file = null;
        file = Convert.FromBase64String(dto.File);

        //Convert HEIC/HEIF to JPF
        if (extension == "HEIC" || extension == "HEIF")
        {
          try
          {
           using (MagickImageCollection images = new MagickImageCollection())
            {
              images.Read(file);
              using (IMagickImage vertical = images.AppendVertically())
              {
                var imgname = filename + ".jpeg";
                vertical.Format = MagickFormat.Jpeg;
                vertical.Density = new Density(300);
                vertical.Write(imgname);
                extension = "jpeg";
            }
            }
          }
          catch (Exception ex)
          {
            Elmah.ErrorSignal.FromCurrentContext().Raise(ex);
          }
        }
            documentId = Service.AddSupportingDocument(file, extension , userName);

我无法获取输出文件，它只是一个字符串

Answer 1

According to the documentation, and just like @SLaks suggested, you need to do it via a MemoryStream. Check this example straight from the docs:

// Read first frame of gif image
using (MagickImage image = new MagickImage("Snakeware.gif"))
{
    // Save frame as jpg
    image.Write("Snakeware.jpg");
}

// Write to stream
MagickReadSettings settings = new MagickReadSettings();
// Tells the xc: reader the image to create should be 800x600
settings.Width = 800;
settings.Height = 600;

using (MemoryStream memStream = new MemoryStream())
{
    // Create image that is completely purple and 800x600
    using (MagickImage image = new MagickImage("xc:purple", settings))
    {
        // Sets the output format to png
        image.Format = MagickFormat.Png;
        // Write the image to the memorystream
        image.Write(memStream);
    }
}

// Read image from file
using (MagickImage image = new MagickImage("Snakeware.png"))
{
    // Sets the output format to jpeg
    image.Format = MagickFormat.Jpeg;
    // Create byte array that contains a jpeg file
    byte[] data = image.ToByteArray();
}

Answer 2

其他解决方案。

适用于dotnet 6和Nuget 包 Magick.NET-Q16-AnyCPU

    string[] allfiles = Directory.GetFiles(@"__PATH__", "*.heic", SearchOption.AllDirectories);

foreach (var file in allfiles)
{
    FileInfo info = new FileInfo(file);
    using (MagickImage image = new MagickImage(info.FullName))
    {
        // Save frame as jpg
        image.Write(@$"__OUTPATH__{info.Name}.jpg");
    }


}

Answer 3

您需要创建一个MemoryStream, 调用.Write()以将图像写入内存流，然后调用.ToArray()流以获取它写入的字节。