我如何将位图转换为byte []？ [英] How do I convert a Bitmap to byte[]?

问题描述

基本上我插入使用列表视图中插入事件的影像，试图调整从FileUpload控件的图像，然后将其保存在使用LINQ SQL数据库。

我发现一些代码来创建FileUpload控件内容的新的位图，但这是将其存储在一个文件服务器上，从的这个来源，但我需要保存该位图回SQL数据库，我想我需要转换回一个byte []格式。

那么，如何将位图转换为一个byte []格式的？

如果我要对这个错误的方式，我将不胜感激它，你可以纠正。我

下面是我的代码：

  //查找FileUpload控件
字符串文件名= uplImage.FileName; 
 
 //创建FileUpload控件
位图originalBMP =新位图（uplImage.FileContent）的内容存储的位图; 
 
 //计算新的图像尺寸
 INT origWidth = originalBMP.Width; 
 INT origHeight = originalBMP.Height; 
 INT sngRatio = origWidth / origHeight; 
 INT newWidth = 100; 
 INT newHeight = sngRatio * newWidth; 
 
 //创建一个新位图，其中将保持前位大小
位图newBMP =新位图（originalBMP，newWidth，newHeight）; 
 
 //创建一个基于新的位图
图形oGraphics = Graphics.FromImage（newBMP）的图形; 
 
 //设置新的图形文件
 oGraphics.Smoothi​​ngMode = Smoothi​​ngMode.AntiAlias​​的性能; 
 oGraphics.InterpolationMode = InterpolationMode.HighQualityBicubic; 
 
 //绘制基于所述调整大小的位图
 oGraphics.DrawImage（originalBMP，0，0，newWidth，newHeight）新的图形; 
 
 
 
 PHJamesDataContext DB =新PHJamesDataContext（）; 
 
 System.IO.MemoryStream流=新System.IO.MemoryStream（）; 
 newBMP.Save（流，System.Drawing.Imaging.ImageFormat.Bmp）; 
 stream.Position = 0; 
字节[]数据=新的字节[stream.Length] 
 
 PHJProjectPhoto myPhoto = 
新PHJProjectPhoto 
 {
 ProjectPhoto =数据，
订购日期= DateTime.Now，
 ProjectPhotoCaption = ProjectPhotoCaptionTextBox.Text， 
专案编号= selectedProjectId 
}; 
 
 db.PHJProjectPhotos.InsertOnSubmit（myPhoto）; 
 db.SubmitChanges（）; 
  

解决方案

您应该能够这块改为

  System.IO.MemoryStream流=新System.IO.MemoryStream（）; 
 newBMP.Save（流，System.Drawing.Imaging.ImageFormat.Bmp）; 
 
 PHJProjectPhoto myPhoto = 
新PHJProjectPhoto 
 {
 ProjectPhoto = stream.ToArray（）//<< ---这将您的流转换为字节[] 
订购日期= DateTime.Now，
 ProjectPhotoCaption = ProjectPhotoCaptionTextBox.Text，
专案编号= selectedProjectId 
}; 
  

Basically I am inserting an image using the listviews inserting event, trying to resize an image from the fileupload control, and then save it in a SQL database using LINQ.

I found some code to create a new bitmap of the content in the fileupload control, but this was to store it in a file on the server, from this source, but I need to save the bitmap back into the SQL database, which I think I need to convert back into a byte[] format.

So how do I convert the bitmap to a byte[] format?

If I am going about this the wrong way I would be grateful it you could correct me.

Here is my code:

            // Find the fileUpload control
            string filename = uplImage.FileName;

            // Create a bitmap in memory of the content of the fileUpload control
            Bitmap originalBMP = new Bitmap(uplImage.FileContent);

            // Calculate the new image dimensions
            int origWidth = originalBMP.Width;
            int origHeight = originalBMP.Height;
            int sngRatio = origWidth / origHeight;
            int newWidth = 100;
            int newHeight = sngRatio * newWidth;

            // Create a new bitmap which will hold the previous resized bitmap
            Bitmap newBMP = new Bitmap(originalBMP, newWidth, newHeight);

            // Create a graphic based on the new bitmap
            Graphics oGraphics = Graphics.FromImage(newBMP);

            // 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, newWidth, newHeight);



            PHJamesDataContext db = new PHJamesDataContext();

            System.IO.MemoryStream stream = new System.IO.MemoryStream();
            newBMP.Save(stream, System.Drawing.Imaging.ImageFormat.Bmp);
            stream.Position = 0;
            byte[] data = new byte[stream.Length];

            PHJProjectPhoto myPhoto =
                new PHJProjectPhoto
                {
                    ProjectPhoto = data,
                    OrderDate = DateTime.Now,
                    ProjectPhotoCaption = ProjectPhotoCaptionTextBox.Text,
                    ProjectId = selectedProjectId
                };

            db.PHJProjectPhotos.InsertOnSubmit(myPhoto);
            db.SubmitChanges();

解决方案

You should be able to change this block to

        System.IO.MemoryStream stream = new System.IO.MemoryStream();
        newBMP.Save(stream, System.Drawing.Imaging.ImageFormat.Bmp);

        PHJProjectPhoto myPhoto =
            new PHJProjectPhoto
            {
                ProjectPhoto = stream.ToArray(), // <<--- This will convert your stream to a byte[]
                OrderDate = DateTime.Now,
                ProjectPhotoCaption = ProjectPhotoCaptionTextBox.Text,
                ProjectId = selectedProjectId
            };

这篇关于我如何将位图转换为byte []？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！