Save jpg data from database to a jpg file - sql-server

Question

I want to take the data in a field that contains a jpeg image and save it to an actual file that I can open with a paint editor. I know I could create an application to do this in c# but I'm wondering if there's a quick and easy way to just do it from a sql query?
It doesn't need to work on all records at once. I just need to be able to select a single record and save the image for that record to a file.

Answer 1

You can use MemoryStream object in C# as below
MemoryStream memstmSignature = new MemoryStream(InkToBytes(ds.Tables[1].Rows[0]["SIGNATURE"].ToString(), "image/gif", 0, 0));
Image imaSig = Image.FromStream(memstmSignature);
imaSig.RotateFlip(RotateFlipType.Rotate180FlipX);
imaSig.Save(Path.Combine(this.temporaryFilePath, this.signatureFileName));
memstmSignature.Close();
Helper functions below
private static byte[] InkToBytes(string inkStrokes, string encoderType, float x, float y)
{
ArrayList strokes = new ArrayList();
// max size for bit map
int maxX = 0;
int maxY = 0;
// intialize the strokes array with text string
int strokesCount;
if (inkStrokes.Length > 0)
{
if (inkStrokes.EndsWith(";"))
inkStrokes = inkStrokes.Remove((inkStrokes.Length - 1), 1);
char[] strokeSeperator = { ';' };
string[] strokeArray = inkStrokes.Split(strokeSeperator);
strokesCount = strokeArray.Length;
for (int i = 0; i < strokesCount; i++)
{
Stroke stroke = new Stroke(50);
stroke.Text = strokeArray[i];
strokes.Add(stroke);
Point[] points = stroke.ToPointArray();
int len = points.Length;
foreach (Point point in points)
{
maxX = (point.X > maxX ? point.X : maxX);
maxY = (point.Y > maxY ? point.Y : maxY);
}
}
}
// setup the gdi objects
Bitmap bitMap = new Bitmap(maxX + 20, maxY + 20); // leave some buffer room
Graphics graphics = Graphics.FromImage(bitMap);
Rectangle clientRect = new Rectangle(0, 0, bitMap.Width, bitMap.Height);
Pen pen = new Pen(Color.Black);
pen.Width = 2; // matches the client capture
// draw the bit map
if (x > 0 && y > 0)
graphics.DrawImage(bitMap, x, y);
else
graphics.DrawImage(bitMap, 0, 0);
graphics.FillRectangle(Brushes.White, clientRect);
graphics.DrawRectangle(pen, clientRect);
strokesCount = strokes.Count;
for (int j = 0; j < strokesCount; j++)
{
Stroke stroke = (Stroke)strokes[j];
if (stroke != null)
{
Point[] points = stroke.ToPointArray();
int len = points.Length;
if (len > 1)
{
Point prevPoint = points[0];
for (int i = 1; i < len; i++)
{
graphics.DrawLine(pen, prevPoint.X, prevPoint.Y, points[i].X, points[i].Y);
prevPoint = points[i];
}
}
}
}
// create the bytes from the bitmap to be returned
MemoryStream memStream = new MemoryStream(1000);
ImageCodecInfo imageCodedInfo = GetEncoderInfo(encoderType);
bitMap.Save(memStream, imageCodedInfo, null);
byte[] bytes = memStream.GetBuffer();
memStream.Close();
return bytes;
}
private static ImageCodecInfo GetEncoderInfo(String mimeType)
{
int j;
ImageCodecInfo[] encoders;
encoders = ImageCodecInfo.GetImageEncoders();
for (j = 0; j < encoders.Length; ++j)
{
if (encoders[j].MimeType == mimeType)
return encoders[j];
}
return null;
}
Hope this helps.
NOTE: I have not looked into to optimizing the above code