C# 在Windows Mobile中调整图像大小

是否有人知道如何在.net 2.0Compact框架上调整图像大小

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我希望能够从手机内存中获取手机摄像头拍摄的图像，调整图像大小，然后将其上载到Web服务，这样我就不需要将调整大小的图像存储在磁盘上。

Graphics.FromImage适用于jpg图像，但您可能会遇到内存问题

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看看这篇文章，了解一些想法。

Graphics.FromImage应该适用于jpg图像，但是您可能会遇到内存问题

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请看一看，了解一些想法。

此vb.net可在Windows Mobile上运行。唯一限制：打开大型位图时会导致OutOfMemoryException：

   Private Function ResizedImage(ByVal image As Bitmap, ByVal maxW As Integer, ByVal maxH As Integer) As Bitmap
    Dim divideByH, divideByW As Double
    Dim width, height As Integer
    divideByW = image.Width / maxW
    divideByH = image.Height / maxH
    If divideByW > 1 Or divideByH > 1 Then
        If divideByW > divideByH Then
            width = CInt(CDbl(image.Width) / divideByW)
            height = CInt(CDbl(image.Height) / divideByW)
        Else
            width = CInt(CDbl(image.Width) / divideByH)
            height = CInt(CDbl(image.Height) / divideByH)
        End If
        Dim scaled As New Bitmap(width, height)
        Dim g As Graphics
        g = Graphics.FromImage(scaled)
        g.DrawImage(image, New Rectangle(0, 0, width, height), New Rectangle(0, 0, image.Width, image.Height), GraphicsUnit.Pixel)
        g.Dispose()
        ResizedImage = scaled
    Else
        ResizedImage = image
    End If

End Function

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此vb.net在Windows Mobile上工作。唯一限制：打开大型位图时会导致OutOfMemoryException：

   Private Function ResizedImage(ByVal image As Bitmap, ByVal maxW As Integer, ByVal maxH As Integer) As Bitmap
    Dim divideByH, divideByW As Double
    Dim width, height As Integer
    divideByW = image.Width / maxW
    divideByH = image.Height / maxH
    If divideByW > 1 Or divideByH > 1 Then
        If divideByW > divideByH Then
            width = CInt(CDbl(image.Width) / divideByW)
            height = CInt(CDbl(image.Height) / divideByW)
        Else
            width = CInt(CDbl(image.Width) / divideByH)
            height = CInt(CDbl(image.Height) / divideByH)
        End If
        Dim scaled As New Bitmap(width, height)
        Dim g As Graphics
        g = Graphics.FromImage(scaled)
        g.DrawImage(image, New Rectangle(0, 0, width, height), New Rectangle(0, 0, image.Width, image.Height), GraphicsUnit.Pixel)
        g.Dispose()
        ResizedImage = scaled
    Else
        ResizedImage = image
    End If

End Function

这是我在.NET CF 2.0应用程序中用于调整图像大小的C#代码：

public static Image ResizePicture( Image image, Size maxSize )
{
  if( image == null )
    throw new ArgumentNullException( "image", "Null passed to ResizePictureToMaximum" );

  if( ( image.Width > maxSize.Width ) || ( image.Height > maxSize.Height ) )
  {
    Image resizedImage = new Bitmap( maxSize.Width, maxSize.Height );

    using( Graphics graphics = Graphics.FromImage( resizedImage ) )
    {
      graphics.Clear( Color.White );

      float widthRatio = maxSize.Width / image.Width;
      float heightRatio = maxSize.Height / image.Height;

      int width = maxSize.Width;
      int height = maxSize.Height;

      if( widthRatio > heightRatio )
      {
        width = ( int )Math.Ceiling( maxSize.Width * heightRatio );
      }
      else if( heightRatio > widthRatio )
      {
        height = ( int )Math.Ceiling( maxSize.Height * widthRatio );
      }

      graphics.DrawImage(
        image,
        new Rectangle( 0, 0, width, height ),
        new Rectangle( 0, 0, image.Width, image.Height ),
        GraphicsUnit.Pixel );
    }

    return resizedImage;
  }

  return image;
}

这是我在.NET CF 2.0应用程序中用于调整图像大小的C#代码：

public static Image ResizePicture( Image image, Size maxSize )
{
  if( image == null )
    throw new ArgumentNullException( "image", "Null passed to ResizePictureToMaximum" );

  if( ( image.Width > maxSize.Width ) || ( image.Height > maxSize.Height ) )
  {
    Image resizedImage = new Bitmap( maxSize.Width, maxSize.Height );

    using( Graphics graphics = Graphics.FromImage( resizedImage ) )
    {
      graphics.Clear( Color.White );

      float widthRatio = maxSize.Width / image.Width;
      float heightRatio = maxSize.Height / image.Height;

      int width = maxSize.Width;
      int height = maxSize.Height;

      if( widthRatio > heightRatio )
      {
        width = ( int )Math.Ceiling( maxSize.Width * heightRatio );
      }
      else if( heightRatio > widthRatio )
      {
        height = ( int )Math.Ceiling( maxSize.Height * widthRatio );
      }

      graphics.DrawImage(
        image,
        new Rectangle( 0, 0, width, height ),
        new Rectangle( 0, 0, image.Width, image.Height ),
        GraphicsUnit.Pixel );
    }

    return resizedImage;
  }

  return image;
}

c代码缺少一个强制转换

float widthRatio = (float) maxSize.Width / image.Width;

  float heightRatio = (float) maxSize.Height / image.Height;

以及图像居中：

graphics.DrawImage(image, new Rectangle((maxSize.Width - width) / 2, (maxSize.Height -height ) / 2, width, height), new Rectangle(0, 0, image.Width, image.Height), GraphicsUnit.Pixel);

c代码缺少一个强制转换

float widthRatio = (float) maxSize.Width / image.Width;

  float heightRatio = (float) maxSize.Height / image.Height;

以及图像居中：

graphics.DrawImage(image, new Rectangle((maxSize.Width - width) / 2, (maxSize.Height -height ) / 2, width, height), new Rectangle(0, 0, image.Width, image.Height), GraphicsUnit.Pixel);

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