给图片加水印，然后覆盖原来的图片，为什么会报异常呢，
给图片加水印，然后覆盖原来的图片，为什么会报错误呢，在线等啊！！
下面的代码是我上传图片类，保存的代码
下面是我增加水印的代码
在上面上传的时候，在image.Save(Path_sy);这句报错，报错GDI一般性错误！
我想原因是保存的时候，覆盖原图片的问题，可能是原图片没有关闭，在线求解决办法啊！！
------解决方案--------------------
给你一段代码吧 懒的去找你的错误了
下面的代码是我上传图片类，保存的代码
- C# code
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "text/plain";
context.Response.Charset = "utf-8";
HttpPostedFile file = context.Request.Files["Filedata"];
string uploadPath = HttpContext.Current.Server.MapPath(@context.Request["folder"]) + "\\";
if (file != null)
{
if (!System.IO.Directory.Exists(uploadPath))
{
System.IO.Directory.CreateDirectory(uploadPath);
}
file.SaveAs(uploadPath + file.FileName);//这里是保存在服务器上，我想就在这句之后给图片加水印
string webFilePath = uploadPath + file.FileName;
string webFilePath_sy = uploadPath + file.FileName;
AddWater(webFilePath, webFilePath_sy);
context.Response.Write("1");
}
else
{
context.Response.Write("0");
}
}
public bool IsReusable
{
get
{
return false;
}
}
下面是我增加水印的代码
- C# code
/// <summary>
/// 在图片上增加文字水印
/// </summary>
/// <param name="Path">原服务器图片路径</param>
/// <param name="Path_sy">生成的带文字水印的图片路径</param>
public static void AddWater(string Path, string Path_sy)
{
string addText = "文字水印";
System.Drawing.Image image = System.Drawing.Image.FromFile(Path);
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(image);
g.DrawImage(image, 0, 0, image.Width, image.Height);
System.Drawing.Font f = new System.Drawing.Font("Verdana", 60);
System.Drawing.Brush b = new System.Drawing.SolidBrush(System.Drawing.Color.Green);
g.DrawString(addText, f, b, 35, 35);
g.Dispose();
image.Save(Path_sy);
image.Dispose();
}
在上面上传的时候，在image.Save(Path_sy);这句报错，报错GDI一般性错误！
我想原因是保存的时候，覆盖原图片的问题，可能是原图片没有关闭，在线求解决办法啊！！
------解决方案--------------------
给你一段代码吧 懒的去找你的错误了
- C# code
/// <summary>
/// 添加图片水印
/// </summary>
/// <param name="sourcePicture">源图片(绝对路径)</param>
/// <param name="targetPicture">生成图片(绝对路径)</param>
/// <param name="watermarkPicture">水印图片(绝对路径)</param>
/// <param name="watermarkAlpha">水印图片透明度(0.1-1.0数值越小透明度越高)</param>
/// <param name="wipeColor">水印图片中要去除的颜色</param>
/// <param name="watermarkPosition">水印图片位置(从1-9,1:左上;2:中上;3:右上;4:左中;5:正中;6:右中;7:左下;8:中下;9:右下)</param>
public static void MakeImgWatemark(string sourcePicture, string targetPicture, string watermarkPicture, float watermarkAlpha, string wipeColor, int watermarkPosition)
{
Color m_colorWipeColor = new Color();
try
{
m_colorWipeColor = ColorTranslator.FromHtml(wipeColor);
}
catch
{
return;
}
if (sourcePicture == string.Empty || targetPicture == string.Empty || watermarkPicture == string.Empty || watermarkAlpha == 0.0 || watermarkPosition < 1 || watermarkPosition > 9)
return;
string m_sSourceExtension = Path.GetExtension(sourcePicture).ToLower();
string m_sWatermarkExtension = Path.GetExtension(watermarkPicture).ToLower();
if (File.Exists(sourcePicture) == false || File.Exists(watermarkPicture) == false || (m_sSourceExtension != ".gif" && m_sSourceExtension != ".jpg" && m_sSourceExtension != ".png" && m_sSourceExtension != ".bmp") || (m_sWatermarkExtension != ".gif" && m_sWatermarkExtension != ".jpg" && m_sWatermarkExtension != ".png" && m_sWatermarkExtension != ".bmp"))
return;
System.Drawing.Image m_imgSource = System.Drawing.Image.FromFile(sourcePicture);
int m_iSourceWidth = m_imgSource.Width;
int m_iSourceHeight = m_imgSource.Height;
float m_fHorizontalResolution = m_imgSource.HorizontalResolution;
float m_fVerticalResolution = m_imgSource.VerticalResolution;
Bitmap m_bmSource = new Bitmap(m_imgSource, m_iSourceWidth, m_iSourceHeight);
m_imgSource.Dispose();
m_bmSource.SetResolution(m_fHorizontalResolution, m_fVerticalResolution);
m_imgSource.Dispose();
Graphics m_grSource = Graphics.FromImage(m_bmSource);
m_grSource.SmoothingMode = SmoothingMode.AntiAlias;
m_grSource.DrawImage(m_bmSource, new Rectangle(0, 0, m_iSourceWidth, m_iSourceHeight), 0, 0, m_iSourceWidth, m_iSourceHeight, GraphicsUnit.Pixel);
System.Drawing.Image m_imgWatermark = new Bitmap(watermarkPicture);
int m_iWatermarkWidth = m_imgWatermark.Width;
int m_iWatermarkHeight = m_imgWatermark.Height;
Bitmap m_bmWatermark = new Bitmap(m_bmSource);
m_bmWatermark.SetResolution(m_fHorizontalResolution, m_fVerticalResolution);
Graphics m_grWatermark = Graphics.FromImage(m_bmWatermark);
ImageAttributes m_imgAttributes = new ImageAttributes();
ColorMap colorMap = new ColorMap();
colorMap.OldColor = Color.FromArgb(255, m_colorWipeColor);
colorMap.NewColor = Color.FromArgb(0, 0, 0, 0);
ColorMap[] remapTable = { colorMap };
m_imgAttributes.SetRemapTable(remapTable, ColorAdjustType.Bitmap);
float[][] colorMatrixElements = {
new float[] {1.0f, 0.0f, 0.0f, 0.0f, 0.0f}, // red红色
new float[] {0.0f, 1.0f, 0.0f, 0.0f, 0.0f}, //green绿色
new float[] {0.0f, 0.0f, 1.0f, 0.0f, 0.0f}, //blue蓝色
new float[] {0.0f, 0.0f, 0.0f, watermarkAlpha, 0.0f}, //透明度
new float[] {0.0f, 0.0f, 0.0f, 0.0f, 1.0f}};//
ColorMatrix m_wmColorMatrix = new ColorMatrix(colorMatrixElements);
m_imgAttributes.SetColorMatrix(m_wmColorMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);
int m_iWatermarkX;
int m_iWatermarkY;
switch (watermarkPosition)
{
case 1:
m_iWatermarkX = 10;
m_iWatermarkY = 10;
break;
case 2:
m_iWatermarkX = (m_iSourceWidth - m_iWatermarkWidth) / 2;
m_iWatermarkY = 10;
break;
case 3:
m_iWatermarkX = m_iSourceWidth - m_iWatermarkWidth - 10;
m_iWatermarkY = 10;
break;
case 4:
m_iWatermarkX = 10;
m_iWatermarkY = (m_iSourceHeight - m_iWatermarkHeight) / 2;
break;
case 5:
m_iWatermarkX = (m_iSourceWidth - m_iWatermarkWidth) / 2;
m_iWatermarkY = (m_iSourceHeight - m_iWatermarkHeight) / 2;
break;
case 6:
m_iWatermarkX = m_iSourceWidth - m_iWatermarkWidth - 10;
m_iWatermarkY = (m_iSourceHeight - m_iWatermarkHeight) / 2;
break;
case 7:
m_iWatermarkX = 10;
m_iWatermarkY = m_iSourceHeight - m_iWatermarkHeight - 10;
break;
case 8:
m_iWatermarkX = (m_iSourceWidth - m_iWatermarkWidth) / 2;
m_iWatermarkY = m_iSourceHeight - m_iWatermarkHeight - 10;
break;
case 9:
m_iWatermarkX = m_iSourceWidth - m_iWatermarkWidth - 10;
m_iWatermarkY = m_iSourceHeight - m_iWatermarkHeight - 10;
break;
default:
m_iWatermarkX = m_iSourceWidth - m_iWatermarkWidth - 10;
m_iWatermarkY = m_iSourceHeight - m_iWatermarkHeight - 10;
break;
}
m_grWatermark.DrawImage(m_imgWatermark, new Rectangle(m_iWatermarkX, m_iWatermarkY, m_iWatermarkWidth, m_iWatermarkHeight), 0, 0, m_iWatermarkWidth, m_iWatermarkHeight, GraphicsUnit.Pixel, m_imgAttributes);
m_bmSource = m_bmWatermark;
m_grSource.Dispose();
m_grWatermark.Dispose();
ImageFormat m_imgformatTarget = ImageFormat.Jpeg;
switch (Right(targetPicture, 4).ToLower())
{
case ".gif":
m_imgformatTarget = ImageFormat.Gif; break;
case ".jpg":
m_imgformatTarget = ImageFormat.Jpeg; break;
case ".png":
m_imgformatTarget = ImageFormat.Png; break;
case ".bmp":
m_imgformatTarget = ImageFormat.Bmp; break;
default:
m_imgformatTarget = ImageFormat.Jpeg; break;
}
m_bmSource.Save(targetPicture, m_imgformatTarget);
m_bmSource.Dispose();
m_imgWatermark.Dispose();
m_bmWatermark.Dispose();
m_grWatermark.Dispose();
m_grSource.Dispose();
m_imgAttributes.Dispose();
}