[英]How to convert from Graphics Object to Base64 String
我如何將Graphics
對象轉換為C#
的Base64
字符串
Image img = Image.FromStream(imageStream, true);
Graphics graphics = Graphics.FromImage(img);
您可以使用C#
MemoryStreams 在Graphics
、 Bitmaps
和Base64 Strings
之間進行轉換
//
//Convert Base64 String to Image
byte[] imageBytes = Convert.FromBase64String(imageBase64String);
MemoryStream imageStream = new MemoryStream(imageBytes, 0, imageBytes.Length);
imageStream.Write(imageBytes, 0, imageBytes.Length);
Image img = Image.FromStream(imageStream, true);
//
// Convert Image to Graphics Object
Graphics graphics = Graphics.FromImage(img);
graphics.DrawRectangle(new Pen(Color.Red, 3), rectangle);
//
//Convert Graphics Object to Base64String
using (MemoryStream ms = new MemoryStream())
{
// Convert Image to byte[]
img.Save(ms, ImageFormat.Jpeg);
imageBytes = ms.ToArray();
// Convert byte[] to Base64 String
string base64String = Convert.ToBase64String(imageBytes);
return base64String;
}
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