【C#/WPF】Bitmap、BitmapImage、ImageSource 、byte[]转换问题
Posted on 2023-12-21 15:40 WebEnh 阅读(486) 评论(0) 编辑 收藏 举报C#/WPF项目中,用到图像相关的功能时,涉及到多种图像数据类型的相互转换问题,这里做了个整理。包含的内容如下:
- Bitmap和BitmapImage相互转换。
- RenderTargetBitmap –> BitmapImage
- ImageSource –> Bitmap
- BitmapImage和byte[]相互转换。
- byte[] –> Bitmap
StackOverflow上有很多解决方案,这里选择了试过可行的方法:
- Bitmap和BitmapImage相互转换
- 谷歌上搜关键字 C# WPF Convert Bitmap BitmapImage
// Bitmap --> BitmapImage
public static BitmapImage BitmapToBitmapImage(Bitmap bitmap)
{
using (MemoryStream stream = new MemoryStream())
{
bitmap.Save(stream, ImageFormat.Png); // 坑点:格式选Bmp时,不带透明度
stream.Position = 0;
BitmapImage result = new BitmapImage();
result.BeginInit();
// According to MSDN, "The default OnDemand cache option retains access to the stream until the image is needed."
// Force the bitmap to load right now so we can dispose the stream.
result.CacheOption = BitmapCacheOption.OnLoad;
result.StreamSource = stream;
result.EndInit();
result.Freeze();
return result;
}
}
// BitmapImage --> Bitmap
public static Bitmap BitmapImageToBitmap(BitmapImage bitmapImage)
{
// BitmapImage bitmapImage = new BitmapImage(new Uri("../Images/test.png", UriKind.Relative));
using (MemoryStream outStream = new MemoryStream())
{
BitmapEncoder enc = new BmpBitmapEncoder();
enc.Frames.Add(BitmapFrame.Create(bitmapImage));
enc.Save(outStream);
Bitmap bitmap = new Bitmap(outStream);
return new Bitmap(bitmap);
}
}
- RenderTargetBitmap –> BitmapImage
// RenderTargetBitmap --> BitmapImage
public static BitmapImage ConvertRenderTargetBitmapToBitmapImage(RenderTargetBitmap wbm)
{
BitmapImage bmp = new BitmapImage();
using (MemoryStream stream = new MemoryStream())
{
BmpBitmapEncoder encoder = new BmpBitmapEncoder();
encoder.Frames.Add(BitmapFrame.Create(wbm));
encoder.Save(stream);
bmp.BeginInit();
bmp.CacheOption = BitmapCacheOption.OnLoad;
bmp.CreateOptions = BitmapCreateOptions.PreservePixelFormat;
bmp.StreamSource = new MemoryStream(stream.ToArray()); //stream;
bmp.EndInit();
bmp.Freeze();
}
return bmp;
}
// RenderTargetBitmap --> BitmapImage
public static BitmapImage RenderTargetBitmapToBitmapImage(RenderTargetBitmap rtb)
{
var renderTargetBitmap = rtb;
var bitmapImage = new BitmapImage();
var bitmapEncoder = new PngBitmapEncoder();
bitmapEncoder.Frames.Add(BitmapFrame.Create(renderTargetBitmap));
using (var stream = new MemoryStream())
{
bitmapEncoder.Save(stream);
stream.Seek(0, SeekOrigin.Begin);
bitmapImage.BeginInit();
bitmapImage.CacheOption = BitmapCacheOption.OnLoad;
bitmapImage.StreamSource = stream;
bitmapImage.EndInit();
}
return bitmapImage;
}
- ImageSource –> Bitmap
// ImageSource --> Bitmap
public static System.Drawing.Bitmap ImageSourceToBitmap(ImageSource imageSource)
{
BitmapSource m = (BitmapSource)imageSource;
System.Drawing.Bitmap bmp = new System.Drawing.Bitmap(m.PixelWidth, m.PixelHeight, System.Drawing.Imaging.PixelFormat.Format32bppPArgb); // 坑点:选Format32bppRgb将不带透明度
System.Drawing.Imaging.BitmapData data = bmp.LockBits(
new System.Drawing.Rectangle(System.Drawing.Point.Empty, bmp.Size), System.Drawing.Imaging.ImageLockMode.WriteOnly, System.Drawing.Imaging.PixelFormat.Format32bppPArgb);
m.CopyPixels(Int32Rect.Empty, data.Scan0, data.Height * data.Stride, data.Stride);
bmp.UnlockBits(data);
return bmp;
}
- BitmapImage和byte[]相互转换
// BitmapImage --> byte[]
public static byte[] BitmapImageToByteArray(BitmapImage bmp)
{
byte[] bytearray = null;
try
{
Stream smarket = bmp.StreamSource; ;
if (smarket != null && smarket.Length > 0)
{
//设置当前位置
smarket.Position = 0;
using (BinaryReader br = new BinaryReader(smarket))
{
bytearray = br.ReadBytes((int)smarket.Length);
}
}
}
catch (Exception ex)
{
Console.WriteLine(ex);
}
return bytearray;
}
// byte[] --> BitmapImage
public static BitmapImage ByteArrayToBitmapImage(byte[] array)
{
using (var ms = new System.IO.MemoryStream(array))
{
var image = new BitmapImage();
image.BeginInit();
image.CacheOption = BitmapCacheOption.OnLoad; // here
image.StreamSource = ms;
image.EndInit();
image.Freeze();
return image;
}
}
- byte[] –> Bitmap
public static System.Drawing.Bitmap ConvertByteArrayToBitmap(byte[] bytes)
{
System.Drawing.Bitmap img = null;
try
{
if (bytes != null && bytes.Length != 0)
{
MemoryStream ms = new MemoryStream(bytes);
img = new System.Drawing.Bitmap(ms);
}
}
catch (Exception ex)
{
Console.WriteLine(ex);
}
return img;
}
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