I have saved an image in database using following code.
ofd.ShowDialog()
vrPicHolder = IO.File.ReadAllBytes(ofd.FileName)
Dim drPic As DataRow
drPic = DsPic.tblPicTest.NewRow
drPic.Item("Picture") = vrPicHolder
DsPic.tblPicTest.Rows.Add(drPic)
taPic.Update(DsPic.tblPicTest)
Now I want to display this image in a picture box. I tried
PictureBox1.Image = Image.FromFile(vrPicHolder)
But it says can not convert Byte() to string. Please advise how to load this picture.
Thanks
Furqan
The method you're calling expects a string that's the filename of an image. You need to pass it the filename of an image that is a BMP, GIF, JPEG, PNG or TIFF format.
Image.FromFile Method (String)
What you should be doing is this:
Dim pictureBytes as New MemoryStream(vrPicHolder)
PicutureBox1.Image = Image.FromStream(pictureBytes)
Image.FromStream Method (Stream)
This is because Image.FromFile Method expects FilePath as String. Its like importing a file from some given path.See Image.FromFile Method (String)
Image.FromStream Method (Stream) is the remedy for this.
One more thing ,you should not set the complete Image to the database . Instead save the image into some physical path and refer this path from the database.
Check this out:
http://windevblog.blogspot.com/2008/08/convert-image-to-byte-array-and-vice.html
Related
I am using this code now:
Dim data() As Byte = File.ReadAllBytes("D:\desktop\image.png")
File.WriteAllBytes("D:\desktop\file.txt", data)
Instead of File.WriteAllBytes (writing to a file) I want to write those bytes to a richtextbox, is this possible?
Thanks!
you can use like the following
Dim data() As Byte = File.ReadAllBytes("K:\sample.txt")
ritchText.Text = System.Text.Encoding.UTF8.GetString(data)
If you give the input as image file then you will get only Unicode characters. if you give textfile like the above then will give the exact content of the input file.
happy new year!
I just want to generate DataURL type data in VB.Net and also want to load string type DataURL to an image.
In other words, I want to convert an image in PictureBox(or Image) into string type DataURL vice versa.
The purpose of this kind of doubtful procedure is to save string data and image data into one single file.
Thank you!
Something like this:
Use this function to get a Base64 string representation of the Image
Public Function ToBase64String(ByVal aImage As Image) As String
Using stream = New System.IO.MemoryStream
aImage.Save(stream, System.Drawing.Imaging.ImageFormat.Png)
Return Convert.ToBase64String(stream.ToArray)
End Using
End Function
Then use this to display it:
<img src="data:image/png;base64, Base64StringHere" />
I am trying to resize a .tif image and then display it on the browser by converting it to a base64 string. Since ImageIo doesn't support TIF images by default, i have added imageio_alpha-1.1.jar(got it here - http://www.findjar.com/jar/geoserver/jai/jars/jai_imageio-1.1-alpha.jar.html). Now ImageIO is able to register the plugin, which i checked by doing this
String[] writerNames = ImageIO.getWriterFormatNames();
writerNames has TIF in it, this means ImageIO has registered the plugin.
I am resizing the image like this
Map resizeImage(BufferedImage imageData, int width, int height, String imageFormat){
BufferedImage thumbnail = Scalr.resize(imageData, Scalr.Method.SPEED, Scalr.Mode.FIT_EXACT ,
width, height, Scalr.OP_ANTIALIAS);
String[] writerNames = ImageIO.getWriterFormatNames();
ByteArrayOutputStream baos = new ByteArrayOutputStream()
ImageIO.write(thumbnail, imageFormat, baos)
baos.flush()
byte[] imageBytes = baos.toByteArray()
baos.close()
return [imageBytes:imageBytes, imageFormat:imageFormat]
}
String encodeImageToBase64(byte[] imageData){
return Base64.encodeBase64String(imageData)
}
BufferedImage getBufferedImage(byte[] imageData){
ByteArrayInputStream bais = new ByteArrayInputStream(imageData)
BufferedImage bImageFromConvert = ImageIO.read(bais)
bais.close()
return bImageFromConvert
}
String resizeToDimensions(byte[] imageData, String imageFormat, int width, int height){
def bimg = getBufferedImage(imageData)
Map resizedImageData = resizeImage(bimg, width, height, imageFormat)
return encodeImageToBase64(resizedImageData.imageBytes)
}
now i am displaying the image like this
< img src = "data:image/tif;base64,TU0AKgAAAAgADAEAAAMAAA...." /> with this i get failed to load url message(on hovering)
as far as i know the base64 string usually starts with /9j/(may be i am wrong). when i am appending /9j/. I get an error - "image corrupt or truncated". I am not able to figure out the problem here, please help.
At first glance your use of the Data URI format looks correct -- try and narrow down exactly where the failure is.
I would recommend:
In your method where you return the string to the front end, I would recommend printing the entire thing out to the console to get the raw data in Data URI format.
Take the Data URI string, create a sample HTML file with the hard-coded value in it, try and load it... does the image display? If so, great, then your problem is with how you are streaming that back to the front end or how you are trying to load it. (Likely a JavaScript/DOM issue)
If that doesn't work, try and chop the Base64 section out of the example and save it into an example TXT file. In your Java code, load it, decode it and try and create an image out of it and write it back out to a TIFF -- if that didn't work, then there is something wrong with your Base64 handling and the encoding is invalid most likely.
Getting that far should answer most of the questions.
Actually now that I think about it, try and use ImageIO to read the image into a BufferedImage, then process it with imgscalr, then immediately call ImageIO.write and try and write it out to a new TIF someplace else and make sure the ImageIO decoding/encoding process is working correctly.
Hope that helps!
My app retrieves file content from remote server. File can be image or text. When the file is image it returns some string like this:
????\bNExif\0\0MM\0*\0\0\0\b\0\a\0.... and so on. As I understand it's an image but in other format (binary?).
So how can I convert that string to an image and set it to control as source?
Thanks.
I think you can do something like this:
MemoryStream ms = new MemoryStream(bytes);
BitmapImage bi = new BitmapImage();
bi.SetSource(ms);
Then if you have an Image element in XAML, say XamlImage:
XamlImage.Source = bi;
I have a requirement to be be able to embed scanned tiff images into some SSRS reports.
When I design a report in VS2005 and add an image control the tiff image displays perfectly however when I build it. I get the warning :
Warning 2 [rsInvalidMIMEType] The value of the MIMEType property for the image ‘image1’ is “image/tiff”, which is not a valid MIMEType. c:\SSRSStuff\TestReport.rdl 0 0
and instead of an image I get the little red x.
Has anybody overcome this issue?
Assuming you're delivering the image file via IIS, use an ASP.NET page to change image formats and mime type to something that you can use.
Response.ContentType = "image/png";
Response.Clear();
using (Bitmap bmp = new Bitmap(tifFilepath))
bmp.Save(Response.OutputStream, ImageFormat.Png);
Response.End();
I have been goggling fora solution on how to display a TIFF image in a SSRS report but I couldn't find any and since SSRS doesn's support TIFF, I thought converting the TIFF to one of the suppported format will do the trick. And it did. I don't know if there are similar implementation like this out there, but I am just posting so others could benefit as well.
Note this only applies if you have a TIFF image saved on database.
Public Shared Function ToImage(ByVal imageBytes As Byte()) As Byte()
Dim ms As System.IO.MemoryStream = New System.IO.MemoryStream(imageBytes)
Dim os As System.IO.MemoryStream = New System.IO.MemoryStream()
Dim img As System.Drawing.Image = System.Drawing.Image.FromStream(ms)
img.Save(os, System.Drawing.Imaging.ImageFormat.Jpeg)
Return os.ToArray()
End Function
Here’s how you can use the code:
1. In the Report Properties, Select Refereneces, click add and browse System.Drawing, Version=2.0.0.0
2. Select the Code Property, Copy paste the function above
3. Click Ok
4. Drop an Image control from the toolbox
4.1. Right-Click the image and select Image Properties
4.2. Set the Image Source to Database
4.3. In the Use this field, Click expression and paste the code below
=Code.ToImage(Fields!FormImage.Value)
4.4. Set the appropriate Mime to Jpeg
Regards,
Fulbert
Thanks Peter your code didn't compile but the idea was sound.
Here is my attempt that works for me.
protected void Page_Load(object sender, EventArgs e)
{
Response.ContentType = "image/jpeg";
Response.Clear();
Bitmap bmp = new Bitmap(tifFileLocation);
bmp.Save(Response.OutputStream, ImageFormat.Jpeg);
Response.End();
}