GDI +在Bitmap.Save方法中发生一般错误

小编典典

GDI +在Bitmap.Save方法中发生一般错误

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。

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

newBMP.Save(directory + "tn_" + filename);

导致异常“ GDI +中发生一般错误”。

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。

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();
    }

阅读 540

2020-05-19

共1个答案

小编典典

从文件构造位图对象或图像对象时，文件在对象的生存期内保持锁定状态。因此，您无法更改图像并将其保存回其原始位置。
http://support.microsoft.com/?id=814675

GDI
+，JPEG图像到MemoryStream中发生一般错误

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…

保存到“中间”内存流，应该可以

例如尝试这个-替换

    Bitmap newBitmap = new Bitmap(thumbBMP);
    thumbBMP.Dispose();
    thumbBMP = null;
    newBitmap.Save("~/image/thumbs/" + "t" + objPropBannerImage.ImageId, ImageFormat.Jpeg);

与类似：

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);
    }
}

2020-05-19