我得到一个图像文件，重新调整大小，然后在同一文件夹中保存另一个名称（filename +“ - resize”），但是我收到此错误
A generic error occurred in GDI+
以下是调整大小方法的代码，
private string resizeImageAndSave(string imagePath)
{
System.Drawing.Image fullSizeImg
= System.Drawing.Image.FromFile(Server.MapPath(imagePath));
var thumbnailImg = new Bitmap(565, 290);
var thumbGraph = Graphics.FromImage(thumbnailImg);
thumbGraph.CompositingQuality = CompositingQuality.HighQuality;
thumbGraph.SmoothingMode = SmoothingMode.HighQuality;
thumbGraph.InterpolationMode = InterpolationMode.HighQualityBicubic;
var imageRectangle = new Rectangle(0, 0, 565, 290);
thumbGraph.DrawImage(fullSizeImg, imageRectangle);
string targetPath = imagePath.Replace(Path.GetFileNameWithoutExtension(imagePath), Path.GetFileNameWithoutExtension(imagePath) + "-resize");
thumbnailImg.Save(targetPath, ImageFormat.Jpeg); //(A generic error occurred in GDI+) Error occur here !
thumbnailImg.Dispose();
return targetPath;
}
我想知道如何修复它？
答案 0 :(得分：6)
正如其他人所说，它可能是权限问题，或者目录可能不存在。 但是，您可以尝试在保存之前克隆图像。如果以上不是问题，这可以解决问题。
private static string resizeImageAndSave(string imagePath)
{
System.Drawing.Image fullSizeImg = System.Drawing.Image.FromFile(Server.MapPath(imagePath));
var thumbnailImg = new Bitmap(565, 290);
var thumbGraph = Graphics.FromImage(thumbnailImg);
thumbGraph.CompositingQuality = CompositingQuality.HighQuality;
thumbGraph.SmoothingMode = SmoothingMode.HighQuality;
thumbGraph.InterpolationMode = InterpolationMode.HighQualityBicubic;
var imageRectangle = new Rectangle(0, 0, 565, 290);
thumbGraph.DrawImage(fullSizeImg, imageRectangle);
fullSizeImg.Dispose(); //Dispose of the original image
string targetPath = imagePath.Replace(Path.GetFileNameWithoutExtension(imagePath), Path.GetFileNameWithoutExtension(imagePath) + "-resize");
Bitmap temp = thumbnailImg.Clone() as Bitmap; //Cloning
thumbnailImg.Dispose();
temp.Save(targetPath, ImageFormat.Jpeg);
temp.Dispose();
return targetPath;
}
答案 1 :(得分：4)
在这行代码之后...
string targetPath = imagePath.Replace(Path.GetFileNameWithoutExtension(imagePath), Path.GetFileNameWithoutExtension(imagePath) + "-resize");
请尝试此操作...添加带扩展名的图片名称
if (!Directory.Exists(targetPath))
Directory.CreateDirectory(targetPath);
//now do the rest and place image name and extension...
thumbnailImg.Save(targetPath + @"\img.jpg", ImageFormat.Jpeg);
thumbnailImg.Dispose();
return targetPath;
答案 2 :(得分：1)
这似乎是一个许可问题。
更改目标文件夹的权限，以便ASP.NET可以写入。
请记住，保存文件的用户不是ASP.NET用户。
答案 3 :(得分：1)
我认为您应该检查您的写入文件的权限，因为我找不到您的代码中的任何重大问题。
答案 4 :(得分：1)
请检查正在构建的路径是什么，您可以在保存之前使用以下内容以确保您的目录路径存在： -
Directory.CreateDirectory(Path.GetDirectoryName(fileName));
还要考虑源文件上的问题锁定，因此您可以创建副本并处置现有引用： -
var thumbnailImgNew = new Bitmap(thumbnailImg);
thumbnailImg.Dispose();
thumbnailImg=null;
//Save it to target path
thumbnailImgNew.Save(targetPath, ImageFormat.Jpeg);
答案 5 :(得分：1)
我做了一些更改，这段代码运行正常:(在重新调整大小之前，您必须先将文件上传到您的网站。重新调整大小后，您可以删除原始文件） 第1步：我已将Image复制到我的应用程序中。 第2步：在按钮点击事件中，我检索了图像路径并提供给重新调整大小的功能。
private string resizeImageAndSave(string imagePath)
{
System.Drawing.Image fullSizeImg
= System.Drawing.Image.FromFile(imagePath);
var thumbnailImg = new Bitmap(565, 290);
var thumbGraph = Graphics.FromImage(thumbnailImg);
thumbGraph.CompositingQuality = CompositingQuality.HighQuality;
thumbGraph.SmoothingMode = SmoothingMode.HighQuality;
thumbGraph.InterpolationMode = InterpolationMode.HighQualityBicubic;
var imageRectangle = new Rectangle(0, 0, 565, 290);
thumbGraph.DrawImage(fullSizeImg, imageRectangle);
string targetPath = imagePath.Replace(Path.GetFileNameWithoutExtension(imagePath), Path.GetFileNameWithoutExtension(imagePath) + "-resize");
thumbnailImg.Save(targetPath, ImageFormat.Jpeg); //(A generic error occurred in GDI+) Error occur here !
thumbnailImg.Dispose();
return targetPath;
}
protected void bntUploadFile_Click(object sender, EventArgs e)
{
string file = Server.MapPath("tree.jpg");
resizeImageAndSave(file);
}
答案 6 :(得分：1)
试试这段代码：
private string resizeImageAndSave(byte[] imageBytes, string fileName) {
var mem = new MemoryStream(imageBytes);
System.Drawing.Image fullSizeImg = System.Drawing.Image.FromStream(mem);
var thumbnailImg = new Bitmap(565, 290);
var thumbGraph = Graphics.FromImage(thumbnailImg);
thumbGraph.CompositingQuality = CompositingQuality.HighQuality;
thumbGraph.SmoothingMode = SmoothingMode.HighQuality;
thumbGraph.InterpolationMode = InterpolationMode.HighQualityBicubic;
var imageRectangle = new Rectangle(0, 0, 565, 290);
thumbGraph.DrawImage(fullSizeImg, imageRectangle);
string targetPath = Path.Combine(Server.MapPath("~/App_Data"), Path.GetFileNameWithoutExtension(fileName) + "-resize.jpg");
thumbnailImg.Save(targetPath, ImageFormat.Jpeg); //(A generic error occurred in GDI+) Error occur here !
thumbnailImg.Dispose();
return targetPath;
}
protected void SaveButton_Click(object sender, EventArgs e) {
var inStream = Request.Files[0].InputStream;
var buff = new byte[inStream.Length];
inStream.Read(buff, 0, buff.Length);
resizeImageAndSave(buff, Request.Files[0].FileName);
}
答案 7 :(得分：1)
答案 8 :(得分：1)
问题不在于位置，问题在于调整大小。
调整图像大小时，可能会出现GDI问题。 确保您的图像为100％大小的矩形或将图像裁剪为所需大小，然后调整其大小。
因此，如果您有800x600的图像并且想要将其调整为450x339，那么您将有一个空像素，这可能会导致GDI +出错，所以我建议您确保调整大小后的图像是正确的尺寸。所以，如果这可以帮助你，我创建了一个类，可以帮助我调整大小和裁剪图像。
public class ImageHandler
{
private Image cropImage(Image img, Rectangle cropArea)
{
Bitmap bmpImage = new Bitmap(img);
if (bmpImage.Size.Width < cropArea.Width)
cropArea.Width = bmpImage.Size.Width;
if (bmpImage.Size.Height < cropArea.Height)
cropArea.Height = bmpImage.Size.Height;
Bitmap bmpCrop = bmpImage.Clone(cropArea,
bmpImage.PixelFormat);
return (Image)(bmpCrop);
}
private Image resizeImage(Image imgToResize, Size size)
{
int sourceWidth = imgToResize.Width;
int sourceHeight = imgToResize.Height;
float nPercent = 0;
float nPercentW = 0;
float nPercentH = 0;
nPercentW = ((float)size.Width / (float)sourceWidth);
nPercentH = ((float)size.Height / (float)sourceHeight);
if (nPercentH < nPercentW)
nPercent = nPercentH;
else
nPercent = nPercentW;
int destWidth = (int)(sourceWidth * nPercent);
int destHeight = (int)(sourceHeight * nPercent);
Bitmap b = new Bitmap(destWidth, destHeight);
Graphics g = Graphics.FromImage((Image)b);
g.InterpolationMode = InterpolationMode.HighQualityBicubic;
g.DrawImage(imgToResize, 0, 0, destWidth, destHeight);
g.Dispose();
return (Image)b;
}
public Image ResizeWithCrop(Image imgToResize, Size size, bool center = true)
{
int sourceWidth = imgToResize.Width;
int sourceHeight = imgToResize.Height;
float nPercent = 0;
float nPercentW = 0;
float nPercentH = 0;
nPercentW = ((float)size.Width / (float)sourceWidth);
nPercentH = ((float)size.Height / (float)sourceHeight);
if (nPercentH < nPercentW)
nPercent = nPercentW;
else
nPercent = nPercentH;
float resultWidth = sourceWidth * nPercent;
float resultHeight = sourceHeight * nPercent;
int destWidth = (int)resultWidth;
int destHeight = (int)resultHeight;
Bitmap b = new Bitmap(destWidth, destHeight);
Graphics g = Graphics.FromImage((Image)b);
g.InterpolationMode = InterpolationMode.HighQualityBicubic;
g.DrawImage(imgToResize, 0, 0, destWidth, destHeight);
g.Dispose();
int restWidth = destWidth - size.Width;
int restHeight = destHeight - size.Height;
int pX = center ? restWidth > 0 ? (int)(restWidth / 2) : 0 : 0;
int pY = center ? restHeight > 0 ? (int)(restHeight / 2) : 0 : 0;
return cropImage((Image)b, new Rectangle(pX, pY, size.Width, size.Height));
}
public void SaveJpeg(string path, Image img, long quality = 85L)
{
try
{
EncoderParameter qualityParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, quality);
ImageCodecInfo jpegCodec = getEncoderInfo(@"image/jpeg");
EncoderParameters encoderParams
= new EncoderParameters(1);
encoderParams.Param[0] = qualityParam;
System.IO.MemoryStream mss = new System.IO.MemoryStream();
System.IO.FileStream fs
= new System.IO.FileStream(path, System.IO.FileMode.Create
, System.IO.FileAccess.ReadWrite);
img.Save(mss, jpegCodec, encoderParams);
byte[] matriz = mss.ToArray();
fs.Write(matriz, 0, matriz.Length);
mss.Close();
fs.Close();
}
catch (Exception ex)
{
}
}
private ImageCodecInfo getEncoderInfo(string mimeType)
{
// Get image codecs for all image formats
ImageCodecInfo[] codecs = ImageCodecInfo.GetImageEncoders();
// Find the correct image codec
for (int i = 0; i < codecs.Length; i++)
if (codecs[i].MimeType == mimeType)
return codecs[i];
return null;
}
public void SavePng(string path, Image img, long quality = 85L)
{
try
{
EncoderParameter qualityParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, quality);
ImageCodecInfo jpegCodec = getEncoderInfo(@"image/png");
EncoderParameters encoderParams
= new EncoderParameters(1);
encoderParams.Param[0] = qualityParam;
System.IO.MemoryStream mss = new System.IO.MemoryStream();
System.IO.FileStream fs
= new System.IO.FileStream(path, System.IO.FileMode.Create
, System.IO.FileAccess.ReadWrite);
img.Save(mss, jpegCodec, encoderParams);
byte[] matriz = mss.ToArray();
fs.Write(matriz, 0, matriz.Length);
mss.Close();
fs.Close();
}
catch (Exception ex)
{
}
}
}
答案 9 :(得分：1)
关于这一行：
string targetPath = imagePath.Replace(Path.GetFileNameWithoutExtension(imagePath), Path.GetFileNameWithoutExtension(imagePath) + "-resize");
您确定在原始imagePath中多次出现没有扩展名的文件名吗？这可能会导致问题，例如没有定位到正确的文件夹。