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@kingofhawks
Last active June 10, 2021 06:38
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Add text to existing image with C# and merge with another image file
using System;
using System.Collections.Generic;
using System.Linq;
using System.IO;
using System.Text;
using System.Threading.Tasks;
using System.Drawing;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;
using System.Drawing.Text;
namespace ConsoleApplication1
{
class BeiAnImageUtil
{
private String folder = "E:\\";
public byte[] createImage(String sourceImagePath, String beiAnNumber, String beiAnStampImagePath)
{
Bitmap bitMapImage = new System.Drawing.Bitmap(sourceImagePath);
return this.createImage(bitMapImage, beiAnNumber, beiAnStampImagePath);
}
public byte[] createImage(Bitmap bitMapImage, String beiAnNumber, String beiAnStampImagePath)
{
Graphics graphicImage = Graphics.FromImage(bitMapImage);
//Smooth graphics is nice.
graphicImage.SmoothingMode = SmoothingMode.AntiAlias;
//Write your text.
//graphicImage.DrawString("That's my boy!",
// new Font("Arial", 12, FontStyle.Bold),
// SystemBrushes.WindowText, new Point(0, 0));
Font font = new Font("Tahoma", 16);
int x_axis = 910;
int y_axis = 110;
int distance = 25;
graphicImage.DrawString(beiAnNumber, font, Brushes.Black, new PointF(x_axis, y_axis));
graphicImage.DrawString(DateTime.Now.ToString("yyyy-MM-dd"), font, Brushes.Black, new PointF(x_axis + 90, y_axis + distance));
String validDate = DateTime.Now.AddYears(2).ToString("yyyy-MM-dd");
graphicImage.DrawString("有效期至:" + validDate, font, Brushes.Black, new PointF(x_axis, y_axis + distance * 2));
String tempFile = folder + "test.jpeg";
bitMapImage.Save(tempFile, ImageFormat.Jpeg);
MemoryStream ms = new MemoryStream();
//bitMapImage.Save(ms, ImageFormat.Jpeg);
//graphicImage.Save();
//I am drawing a oval around my text.
//graphicImage.DrawArc(new Pen(Color.Red, 3), 90, 235, 150, 50, 0, 360);
//Set the content type
//Response.ContentType = "image/jpeg";
//Save the new image to the response output stream.
//bitMapImage.Save(Response.OutputStream, ImageFormat.Jpeg);
//Clean house.
//graphicImage.Dispose();
//bitMapImage.Dispose();
byte[] bytes = MergeJpeg(tempFile, beiAnStampImagePath, folder + "output.jpeg");
//Delete temp file
if (System.IO.File.Exists(tempFile))
{
// Use a try block to catch IOExceptions, to
// handle the case of the file already being
// opened by another process.
try
{
System.IO.File.Delete(tempFile);
}
catch (System.IO.IOException e)
{
Console.WriteLine(e.Message);
return bytes;
}
}
return bytes;
}
/// <summary>
/// Merges two Jpeg images vertically
/// </summary>
/// <param name="inputJpeg1">filename with complete path of the first jpeg file.</param>
/// <param name="inputJpeg2">filname with complete path of the second jpeg file.</param>
/// <param name="outputJpeg">filename with complete path where you want to save the output jpeg file.</param>
private byte[] MergeJpeg(string inputJpeg1, string inputJpeg2, string outputJpeg)
{
Image image1 = Image.FromFile(inputJpeg1);
Image image2 = Image.FromFile(inputJpeg2);
int width = Math.Max(image1.Width, image2.Width);
int height = image1.Height + image2.Height;
Bitmap outputImage = new Bitmap(width, height);
Graphics graphics = Graphics.FromImage(outputImage);
graphics.Clear(Color.Black);
graphics.DrawImage(image1, new Point(0, 0));
Point stampPoint = new Point(100, 20);
graphics.DrawImage(image2, stampPoint);
//graphics.DrawImage(image2, new Point(0, image1.Height - image2.Height));
graphics.Dispose();
image1.Dispose();
image2.Dispose();
MemoryStream stream = new MemoryStream();
//outputImage.Save(outputJpeg, System.Drawing.Imaging.ImageFormat.Jpeg);
outputImage.Save(stream, System.Drawing.Imaging.ImageFormat.Jpeg);
outputImage.Dispose();
return stream.ToArray();
}
public Bitmap ByteArraytoBitmap(Byte[] byteArray)
{
MemoryStream stream = new MemoryStream(byteArray);
return new System.Drawing.Bitmap(stream);
}
public byte[] imageToByteArray(System.Drawing.Image imageIn)
{
MemoryStream ms = new MemoryStream();
imageIn.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
return ms.ToArray();
}
static void Main(string[] args)
{
BeiAnImageUtil util = new BeiAnImageUtil();
String folder = "E:\\";
Bitmap bitMapImage = new System.Drawing.Bitmap(folder + "test.jpg");
byte[] imageBytes = util.imageToByteArray(bitMapImage);
//util.createImage(folder + "test.jpg", "SN-XQ-S-201311250025", folder + "test2.jpg");
Bitmap b = util.ByteArraytoBitmap(imageBytes);
byte[] output = util.createImage(b, "SN-XQ-S-201311250025", folder + "test2.jpg");
Bitmap bm = util.ByteArraytoBitmap(output);
bm.Save(folder+"output.jpeg", System.Drawing.Imaging.ImageFormat.Jpeg);
}
}
}
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