Question

我有两种方法可以将图像与字节数组相互转换，这是我从StackOverflow上的here获得的。

Public Function ImageToByteArray(imageIn As Image) As Byte()
    Dim ms As MemoryStream = New MemoryStream()
    imageIn.Save(ms, System.Drawing.Imaging.ImageFormat.Png)
    Return ms.ToArray()
End Function

Public Function ByteArrayToImage(byteArrayIn As Byte()) As Image
    Dim ms As MemoryStream = new MemoryStream(byteArrayIn)
    Dim returnImage As Image = System.Drawing.Image.FromStream(ms)
    Return returnImage
End Function

当我的图像是png文件时，两者都可以正常工作。但是，当用户选择jepg文件或gif时，我得到了System.Runtime.InteropServices.ExternalException: 'A generic error occurred in GDI+.'

如何使ImageToByteArray函数更通用？即接受更多文件格式。

Answer 1

Image类具有一个名为RawFormat的属性，您可以尝试使用它而不是对格式进行硬编码。

    Public Function ImageToByteArray(imageIn As Image) As Byte()
        Dim ms As MemoryStream = New MemoryStream()
        imageIn.Save(ms, imageIn.RawFormat)
        Return ms.ToArray()
    End Function

如果这不起作用，则需要将格式作为参数传递。

    Public Function ImageToByteArray(imageIn As Image, format As System.Drawing.Imaging.ImageFormat) As Byte()
        Dim ms As MemoryStream = New MemoryStream()
        imageIn.Save(ms, imageIn.RawFormat)
        Return ms.ToArray()
    End Function

如何使ImageToByteArray函数更通用？

1 个答案: