将文本添加到图像文件 [英] Adding text to an image file

问题描述

我需要将文本添加到图像文件。我需要读取一个图像文件（JPG，PNG，GIF），我需要一行文本添加到它。

I need to add text to an image file. I need to read one image file (jpg,png,gif) and I need add one line text to it.

推荐答案

好在GDI +中，你会读使用Image类的文件中，然后使用Graphics类文本添加到它。是这样的：

Well in GDI+ you would read in the file using a Image class and then use the Graphics class to add text to it. Something like:

  Image image = Image.FromFile(@"c:\somepic.gif"); //or .jpg, etc...
  Graphics graphics = Graphics.FromImage(image);
  graphics.DrawString("Hello", this.Font, Brushes.Black, 0, 0);

如果您想保存文件覆盖旧的，代码更改位作为直到它的处置Image.FromFile（）方法锁定文件。以下是我想出了：

If you want to save the file over the old one, the code has to change a bit as the Image.FromFile() method locks the file until it's disposed. The following is what I came up with:

  FileStream fs = new FileStream(@"c:\somepic.gif", FileMode.Open, FileAccess.Read);
  Image image = Image.FromStream(fs);
  fs.Close();

  Bitmap b = new Bitmap(image);
  Graphics graphics = Graphics.FromImage(b);
  graphics.DrawString("Hello", this.Font, Brushes.Black, 0, 0);

  b.Save(@"c:\somepic.gif", image.RawFormat);

  image.Dispose();
  b.Dispose();

我会很彻底，虽然测试：）

I would test this quite thoroughly though :)

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