/// <summary>
/// 为图片添加文字水印
/// </summary>
/// <param name="parameters">文字水印过程需要的参数体</param>
/// <param name="errorMsg">异常信息</param>
/// <returns>已加水印的图片数据流</returns>
public static MemoryStream DrawText(TextWatermarkParameters parameters, out string errorMsg)
{
errorMsg = string.Empty;
try
{
// 参数检查
if (!parameters.CheckAndSetDefault(out errorMsg))
throw new InvalidDataException(errorMsg);
// 为源图片添加文字水印
Bitmap finalImage = AddWatermarkTextForSourceImage(parameters, out errorMsg);
if (finalImage == null && !string.IsNullOrEmpty(errorMsg))
throw new InvalidDataException("生成水印图片失败：" + errorMsg);
return GetMemoryStreamFromBitmap(finalImage, parameters.SourceImageFileExtensionName);
}
catch (Exception ex)
{
errorMsg = ex.Message.ToString();
return null;
}
}
