/// <summary>
/// 给图片添加文字水印
/// </summary>
/// <param name="srcFile">源图片存放路径</param>
/// <param name="destFile">目标图片存放路径</param>
/// <param name="fontSize">字号，可超过72号的</param>
/// <param name="throwException">出现异常时是否抛出</param>
/// <param name="text">要添加的文字</param>
public static bool AddWatermarkText(string srcFile, string destFile, int fontSize, string text)
{
if (string.IsNullOrWhiteSpace(srcFile) || string.IsNullOrWhiteSpace(destFile))
{
throw new Exception("源图或目标图片的存放路径都不能为空");
}
System.Drawing.Image img = null;
Graphics picture = null;
Font crFont = null;
StringFormat StrFormat = new StringFormat();
SolidBrush semiTransBrush2 = new SolidBrush(Color.FromArgb(153, 0, 0, 0));
SolidBrush semiTransBrush = new SolidBrush(Color.FromArgb(153, 255, 255, 255));
try
{
img = System.Drawing.Image.FromFile(srcFile);
picture = Graphics.FromImage(img);
SizeF crSize = new SizeF();
crFont = new Font("arial", fontSize, FontStyle.Bold);
crSize = picture.MeasureString(text, crFont);
float xpos = 0;
float ypos = 0;
xpos = (img.Width - crSize.Width) / 2;
ypos = (img.Height - crSize.Height) / 2;
StrFormat.Alignment = StringAlignment.Near;
picture.DrawString(text, crFont, semiTransBrush2, xpos + 1, ypos + 1, StrFormat);
picture.DrawString(text, crFont, semiTransBrush, xpos, ypos, StrFormat);
string destPath = Path.GetDirectoryName(destFile);
if (!string.IsNullOrWhiteSpace(destPath))
{
if (!Directory.Exists(destPath))
{
Directory.CreateDirectory(destPath);
}
}
img.Save(destFile);
return(true);
}
catch (Exception ex)
{
throw new Exception("给图片添加水印时发生异常：" + ex);
}
finally
{
crFont.DisposeIfNotNull();
StrFormat.DisposeIfNotNull();
semiTransBrush2.DisposeIfNotNull();
semiTransBrush.DisposeIfNotNull();
picture.DisposeIfNotNull();
img.DisposeIfNotNull();
}
}