Question

我正在尝试将视觉转换为Ximage（以pdf格式打印）目前我正在使用它：

 Dim img As XImage = XImage.FromFile(path.LocalPath)

但它需要我将它保存在硬盘上我想使用它，但我不知道如何从视觉（在内存中）创建图像并加载它。

 Dim img As XImage = XImage.FromGdiPlusImage(myVisualAsImage)

Answer 1

如果您使用PDFsharp的WPF版本，您还可以使用：

public static XImage FromBitmapSource(BitmapSource image)

几个类（包括BitmapImage和WriteableBitmap）都是从BitmapSource派生的，也可以在这里传递。

另见： http://ryancdavidson.com/blog/2009/09/getting-and-using-the-pixels-of-your-visual-in-wpf/

Answer 2

vb.net - 克服PDFSharp 1.5中遗漏的方法FromGdiPlusImage

Function getTiffImage(sourceImage As Image, pageNumber As Integer) As XImage
    Dim ms As MemoryStream
    Dim returnImage As XImage
    Try
        ms = New MemoryStream()
        Dim objGuid As Guid = sourceImage.FrameDimensionsList(0)
        Dim objDimension As Imaging.FrameDimension = New Imaging.FrameDimension(objGuid)
        sourceImage.SelectActiveFrame(objDimension, pageNumber)
        sourceImage.Save(ms, Imaging.ImageFormat.Tiff)
        returnImage = XImage.FromStream(ms)
    Catch ex As Exception
        returnImage = Nothing
    End Try
    Return returnImage

在内存中从（wpf）visual创建Ximage

2 个答案: