在WinRT上保存带有背景图像的画布 [英] Save canvas with background image on WinRT

问题描述

我想为C＃for WinRT的儿童制作一个简单的绘图应用程序。用户可以选择一张图片并画一点。但是如何保存图像（与背景一起）？

I want to make a simple drawing app for children with C# for WinRT. The user can choose a picture and draw a little bit. But how can I save the image (together with the background)? There is no functionality to save the image with background.

推荐答案

我试图使用您的库将Canvas渲染为图像文件但我得到这个错误运行时：找不到组件（从HRESULT：0x88982F50异常）。代码如下：

I tried to use your library to render a Canvas into an image file but I got this error runtime: "Can't find component. (Exception from HRESULT: 0x88982F50)". Code looks like this:

//SAVE
    private async void saveButton_Click(object sender, RoutedEventArgs e)
    {
        await SaveToFile();
    }

    public async Task SaveToFile()
    {
        var wb = new WriteableBitmap(1, 1);
        await wb.Render(canvas);

        Windows.Storage.Pickers.FileSavePicker save = new Windows.Storage.Pickers.FileSavePicker();
        save.SuggestedStartLocation = Windows.Storage.Pickers.PickerLocationId.Desktop;
        save.DefaultFileExtension = ".jpg";
        save.FileTypeChoices.Add("JPG", new string[] { ".jpg" });
        StorageFile filesave = await save.PickSaveFileAsync();
        await wb.SaveToFile(filesave, Guid.NewGuid());
    }

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