Question

我可以在图片框中显示图片，而无需通过以下代码检查文件大小：

private void button3_Click_1(object sender, EventArgs e)
{
    try
    {
        //Getting The Image From The System
        OpenFileDialog open = new OpenFileDialog();
        open.Filter =
          "Image Files(*.jpg; *.jpeg; *.gif; *.bmp)|*.jpg; *.jpeg; *.gif; *.bmp";

        if (open.ShowDialog() == DialogResult.OK)
        {
            Bitmap img = new Bitmap(open.FileName);

            pictureBox2.Image = img;
        }
    }
    catch (Exception)
    {
        throw new ApplicationException("Failed loading image");
    }
}

我想检查图像大小，例如在图片框中显示之前是 2MB还是4MB 。我还想检查图像的宽度和高度。

Answer 1

Bitmap将保持图像的高度和宽度。

使用FileInfo Length属性获取文件大小。

FileInfo file = new FileInfo(open.FileName);
var sizeInBytes = file.Length;

Bitmap img = new Bitmap(open.FileName);

var imageHeight = img.Height;
var imageWidth = img.Width;

pictureBox2.Image = img;

Answer 2

        try
        {
            //Getting The Image From The System
            OpenFileDialog open = new OpenFileDialog();
            open.Filter = "Image Files(*.jpg; *.jpeg; *.gif; *.bmp)|*.jpg; *.jpeg; *.gif; *.bmp";
            if (open.ShowDialog() == DialogResult.OK)
            {
                System.IO.FileInfo file = new System.IO.FileInfo(open.FileName);
                Bitmap img = new Bitmap(open.FileName);


                if (img.Width < MAX_WIDTH &&
                    img.Height < MAX_HEIGHT &&
                    file.Length < MAX_SIZE)
                    pictureBox2.Image = img;

            }
        }
        catch (Exception)
        {
            throw new ApplicationException("Failed loading image");
        }

Answer 3

UWP当前具有一个不错的界面来获取图像属性。

        FileOpenPicker openPicker = new FileOpenPicker();
        openPicker.ViewMode = PickerViewMode.Thumbnail;
        openPicker.SuggestedStartLocation = PickerLocationId.PicturesLibrary;
        openPicker.FileTypeFilter.Add(".jpg");
        openPicker.FileTypeFilter.Add(".jpeg");
        openPicker.FileTypeFilter.Add(".png");

        StorageFile file = await openPicker.PickSingleFileAsync();
        if (file != null)
        {
            // Application now has read/write access to the picked file
            ImageProperties IP = await file.Properties.GetImagePropertiesAsync();

            double Width = IP.Width;
            double Height = IP.Height;
        }

Answer 4

我遇到了类似的问题，我写了一个方法来检测图片是否为横向。如果可以帮到你。

struct ContentView: View {
    var body: some View {
        DrawShapeBorder(points: [
            CGPoint(x: 100, y: 150),
            CGPoint(x: 300, y: 100),
            CGPoint(x: 300, y: 200),
            CGPoint(x: 100, y: 200)
        ])
        .stroked()
    }
}
struct DrawShapeBorder: Shape {
    
    /// add the double border
    func stroked() -> some View {
        ZStack {
            self.stroke(Color.red, style: StrokeStyle(lineWidth: 20, lineCap: .round, lineJoin: .round))
            self.stroke(Color.white, style: StrokeStyle(lineWidth: 10, lineCap: .round, lineJoin: .round))
        }
    }
    
    var points: [CGPoint]
    
    func path(in rect: CGRect) -> Path {
        var path: Path = Path()
        
        guard let startingPoint = points.first else {
            return path
        }
        
        // go up
        let upStartingPoint = CGPoint(x: startingPoint.x, y: startingPoint.y + 5)
        path.move(to: upStartingPoint)
        
        for pointLocation in points {
            path.addLine(to: pointLocation)
        }
        
        return path
    }
}

检查图像的宽度和高度

4 个答案: