创建一个从System.Drawing.Image对象文件系统上的新形象？ [英] Create a new image on the file system from System.Drawing.Image?

问题描述

好吧，我很抱歉，这可能是一个小白的问题，但我有点卡住了。

Ok, I'm sorry, this is probably a noob question but I'm kinda stuck.

所以我在做什么（在我的asp.net应用程序）加载从文件系统的图像：

So what I'm doing (on my asp.net application) is loading an image from the file system:

System.Drawing.Image tempImage;
tempImage = System.Drawing.Image.FromFile(HttpContext.Server.MapPath(originalPath));

然后我做了一些调整大小：

Then I do some resizing:

tempImage = my awesomeResizingFunction(tempImage, newSize);

和打算使用此将其保存到文件系统中的另一个位置：

and intend to save it to the file system in another location using this:

string newPath = "/myAwesomePath/newImageName.jpg";
tempImage.Save(newPath);

和我所得到的这个错误是：

and what I get is this error:

"A generic error occurred in GDI+."

我知道图像是OK因为我能写出来给浏览器，看到调整后的图像，当我试图挽救它，我只能得到错误。我有点新卡住了，我在做这完全错了？ （嗯，我想这是显而易见的，但你知道我的意思......）

I know the image is "ok" because I can write it out to the browser and see the resized image, I only get the error when I try to save it. I'm kinda new and stuck, am I doing this totally wrong? (Well, i guess that's obvious but you know what I mean...)

推荐答案

PLZ试试这个code ......我用同样的code调整大小的图像和保存。如果你得到的任何问题，那么PLZ让我知道。

plz try this code...I have used the same code for resizing image and saving. if you get any problem then plz let me know.

System.Drawing.Bitmap bmpOut = new System.Drawing.Bitmap(NewWidth, NewHeight);
    System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bmpOut);
    g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
    g.FillRectangle(System.Drawing.Brushes.White, 0, 0, NewWidth, NewHeight);
    g.DrawImage(new System.Drawing.Bitmap(fupProduct.PostedFile.InputStream), 0, 0, NewWidth, NewHeight);
    MemoryStream stream = new MemoryStream();
    switch (fupProduct.FileName.Substring(fupProduct.FileName.IndexOf('.') + 1).ToLower())
    {
        case "jpg":
            bmpOut.Save(stream, System.Drawing.Imaging.ImageFormat.Jpeg);
            break;
        case "jpeg":
            bmpOut.Save(stream, System.Drawing.Imaging.ImageFormat.Jpeg);
            break;
        case "tiff":
            bmpOut.Save(stream, System.Drawing.Imaging.ImageFormat.Tiff);
            break;
        case "png":
            bmpOut.Save(stream, System.Drawing.Imaging.ImageFormat.Png);
            break;
        case "gif":
            bmpOut.Save(stream, System.Drawing.Imaging.ImageFormat.Gif);
            break;
    }
    String saveImagePath = Server.MapPath("../") + "Images/Thumbnail/" + fupProduct.FileName.Substring(fupProduct.FileName.IndexOf('.'));
    bmpOut.Save(saveImagePath);

其中fupProduct是FileUpload控件ID

where fupProduct is fileupload control ID

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