将图像转换为 Base64 字符串

Question

我正在尝试使用 StorageFile 在 UWP 中将图像文件转换为 Base64 字符串这是我的方法：

public async Task<string> ToBase64String(StorageFile file)
{
    var stream = await file.OpenAsync(FileAccessMode.Read);
    var decoder = await BitmapDecoder.CreateAsync(stream);
    var pixels = await decoder.GetPixelDataAsync();
    var bytes = pixels.DetachPixelData();
    return await ToBase64(bytes, (uint)decoder.PixelWidth, (uint)decoder.PixelHeight, decoder.DpiX, decoder.DpiY);
}

和ToBase64是这样的：

private async Task<string> ToBase64(byte[] image, uint pixelWidth, uint pixelHeight, double dpiX, double dpiY)
{
    //encode
    var encoded = new InMemoryRandomAccessStream();
    var encoder = await BitmapEncoder.CreateAsync(BitmapEncoder.PngEncoderId, encoded);
    encoder.SetPixelData(BitmapPixelFormat.Bgra8, BitmapAlphaMode.Straight, pixelWidth, pixelHeight, dpiX, dpiY, image);
    await encoder.FlushAsync();
    encoded.Seek(0);

    //read bytes
    var bytes = new byte[encoded.Size];
    await encoded.AsStream().ReadAsync(bytes, 0, bytes.Length);

    return System.Convert.ToBase64String(bytes);
}

并从我的 MainPage.xaml.cs

调用它

StorageFolder storageFolder = ApplicationData.Current.LocalFolder;
string square_b64 = converter.ToBase64String(await storageFolder.GetFileAsync("Image.png")).Result;

但是，这不起作用。有什么注意事项吗？

Answer 1

StorageFolder storageFolder = ApplicationData.Current.LocalFolder;
StorageFile file1 = await storageFolder.GetFileAsync("Image.png");

string _b64 = Convert.ToBase64String(File.ReadAllBytes(file1.Path));

这对我有用。

将图像转换为 Base64 字符串

Convert Image to Base64 string

c#

base64

image-processing

storagefile

uwp