GDI +在Bitmap.Save方法中发生一般错误 [英] A Generic error occurred in GDI+ in Bitmap.Save method
问题描述
我正在上载该图像的缩略图副本并将其保存在缩略图文件夹中。
I am working on to upload and save a thumbnail copy of that image in a thumbnail folder.
我正在使用以下链接:
http://weblogs.asp.net/markmcdonnell/archive/2008/03/09/resize-image-before-uploading-to-server.aspx
但是
newBMP.Save(directory + "tn_" + filename);
导致异常 GDI +中发生一般错误。
is causing exception "A generic error occurred in GDI+."
我尝试授予文件夹权限,还尝试在保存时使用新的单独bmp对象。
I have tried to give permission on folder, also tried to use a new separate bmp object when saving.
编辑:
protected void ResizeAndSave(PropBannerImage objPropBannerImage)
{
// Create a bitmap of the content of the fileUpload control in memory
Bitmap originalBMP = new Bitmap(fuImage.FileContent);
// Calculate the new image dimensions
int origWidth = originalBMP.Width;
int origHeight = originalBMP.Height;
int sngRatio = origWidth / origHeight;
int thumbWidth = 100;
int thumbHeight = thumbWidth / sngRatio;
int bannerWidth = 100;
int bannerHeight = bannerWidth / sngRatio;
// Create a new bitmap which will hold the previous resized bitmap
Bitmap thumbBMP = new Bitmap(originalBMP, thumbWidth, thumbHeight);
Bitmap bannerBMP = new Bitmap(originalBMP, bannerWidth, bannerHeight);
// Create a graphic based on the new bitmap
Graphics oGraphics = Graphics.FromImage(thumbBMP);
// Set the properties for the new graphic file
oGraphics.SmoothingMode = SmoothingMode.AntiAlias; oGraphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
// Draw the new graphic based on the resized bitmap
oGraphics.DrawImage(originalBMP, 0, 0, thumbWidth, thumbHeight);
Bitmap newBitmap = new Bitmap(thumbBMP);
thumbBMP.Dispose();
thumbBMP = null;
// Save the new graphic file to the server
newBitmap.Save("~/image/thumbs/" + "t" + objPropBannerImage.ImageId, ImageFormat.Jpeg);
oGraphics = Graphics.FromImage(bannerBMP);
// Set the properties for the new graphic file
oGraphics.SmoothingMode = SmoothingMode.AntiAlias; oGraphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
// Draw the new graphic based on the resized bitmap
oGraphics.DrawImage(originalBMP, 0, 0, bannerWidth, bannerHeight);
// Save the new graphic file to the server
bannerBMP.Save("~/image/" + objPropBannerImage.ImageId + ".jpg");
// Once finished with the bitmap objects, we deallocate them.
originalBMP.Dispose();
bannerBMP.Dispose();
oGraphics.Dispose();
}
推荐答案
从
文件构造位图对象或图像对象时,该文件在对象的生存期内保持锁定状态。作为
的结果,您无法更改图像并将其保存回其起源的同一文件
中。
http://support.microsoft.com/?id=814675
在GDI +,JPEG图像到MemoryStream中出现通用错误
Image.Save(..)抛出GDI +异常因为内存流已关闭
http://alperguc.blogspot.in/2008/11/c-generic-error-occurred-in-gdi.html
编辑:
只是从内存写入...
just writing from memory...
保存到应该起作用的中间存储流
save to an 'intermediary' memory stream, that should work
e 。G。试试这个-替换
e.g. try this one - replace
Bitmap newBitmap = new Bitmap(thumbBMP);
thumbBMP.Dispose();
thumbBMP = null;
newBitmap.Save("~/image/thumbs/" + "t" + objPropBannerImage.ImageId, ImageFormat.Jpeg);
类似于:
string outputFileName = "...";
using (MemoryStream memory = new MemoryStream())
{
using (FileStream fs = new FileStream(outputFileName, FileMode.Create, FileAccess.ReadWrite))
{
thumbBMP.Save(memory, ImageFormat.Jpeg);
byte[] bytes = memory.ToArray();
fs.Write(bytes, 0, bytes.Length);
}
}
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