Question

wpf中怎么获取image上的图并转化为bitmap

Answer 1

1.从bitmap转换成ImageSource

　　　[DllImport("gdi32.dll", SetLastError = true)]
private static extern bool DeleteObject(IntPtr hObject);

/// <summary>
/// 从bitmap转换成ImageSource
/// </summary>
/// <param name="icon"></param>
/// <returns></returns>
public static ImageSource ChangeBitmapToImageSource(Bitmap bitmap)
{
//Bitmap bitmap = icon.ToBitmap();
IntPtr hBitmap = bitmap.GetHbitmap();

ImageSource wpfBitmap = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(
hBitmap,
IntPtr.Zero,
Int32Rect.Empty,
BitmapSizeOptions.FromEmptyOptions());

if (!DeleteObject(hBitmap))
{
throw new System.ComponentModel.Win32Exception();
}

return wpfBitmap;
}

2.从Bitmap转换成BitmapSource

/// <summary>
/// 从Bitmap转换成BitmapSource
/// </summary>
/// <param name="bmp"></param>
/// <returns></returns>
public static BitmapSource ChangeBitmapToBitmapSource(this Bitmap bmp)
{
BitmapSource returnSource;

try
{
returnSource = Imaging.CreateBitmapSourceFromHBitmap(bmp.GetHbitmap(),IntPtr.Zero, Int32Rect.Empty, BitmapSizeOptions.FromEmptyOptions());
}
catch
{
returnSource = null;
}

return returnSource;

}

　　　　
3.从Icon到ImageSource的转换

/// <summary>
/// 从Icon到ImageSource的转换
/// </summary>
public ImageSource ChangeIconToImageSource( Icon icon)
{
ImageSource imageSource = System.Windows.Interop.Imaging.CreateBitmapSourceFromHIcon(
icon.Handle,
Int32Rect.Empty,
BitmapSizeOptions.FromEmptyOptions());

return imageSource;
}

4.从Icon到ImageSource的转换

internal static class IconUtilities
{
[DllImport("gdi32.dll", SetLastError = true)]
private static extern bool DeleteObject(IntPtr hObject);

public static ImageSource ToImageSource(this Icon icon)
{
Bitmap bitmap = icon.ToBitmap();
IntPtr hBitmap = bitmap.GetHbitmap();

ImageSource wpfBitmap = Imaging.CreateBitmapSourceFromHBitmap(
hBitmap,
IntPtr.Zero,
Int32Rect.Empty,
BitmapSizeOptions.FromEmptyOptions());

if (!DeleteObject(hBitmap))
{
throw new Win32Exception();
}

return wpfBitmap;
}

　　// 这个是没有附加转换的，：）
　　
public static ImageSource ToImageSource(this Icon icon)
{
ImageSource imageSource = Imaging.CreateBitmapSourceFromHIcon(
icon.Handle,
Int32Rect.Empty,
BitmapSizeOptions.FromEmptyOptions());
return imageSource;
}

}
调用：ImageSource wpfBitmap = img.ToImageSource();