i am working in windows Phone 7 Application. using this code i captured the image and saved into Media Library
myCamera.Show();
and this is for Saving to media Library
mediaLibrary.SavePicture("TestPhoto", imageBits);
My Question is > I want to save my captured image into an Object Where i can directly send to server
imageBits is already an object (of type Stream) so what you're asking for doesn't really make sense. Presumably you're trying to convert it to a byte array in order to send it to the server.
MemoryStream ms = new MemoryStream();
//if you've manipulated stream before this call, reset position
e.ChosenPhoto.Position = 0;
e.ChosenPhoto.CopyTo(ms);
byte[] imageByteArray = ms.ToArray();
ms.Dispose();
imageByteArray then contains your image as a byte array. Alternatively, you could convert the image into a Base64 encoded string and send that, but that depends if your server can decode it.
string base64 = Convert.ToBase64String(imageByteArray);
Related
I am trying to make a .Net 6 console application that would take in a base64string and then save it to the file system as an actual image file
Example
I have this image
https://cdn.pixabay.com/photo/2016/03/28/12/35/cat-1285634_960_720.png
I would have this image already as a base64 string.
Now I want to save to my file system as "cat-1285634_960_720.png"
I just can't figure out how to do it. All the examples I see say to use Image.Save() but I can't find that in .Net6 and looks like it is removed.
First convert the base64 string to a byte array and then use File.WriteAllBytes(...) to save it:
byte[] imageByteArray = Convert.FromBase64String(base64String);
File.WriteAllBytes("image.png", imageByteArray);
Im making this website,where the user has a form in which they can choose a file from their computer,and upload it, but i don't know how i can use it. I'm using MVC and a Web Service also in C# where im handling the connection to the Database,where I have to save the file.The file can be a pdf,word or an image.
So the question is,how can I save it and also check its size.Thank you
You can use the ContentLength property of HttpPostedFileBase to get the size of the file -
https://msdn.microsoft.com/en-us/library/system.web.httppostedfilebase.contentlength(v=vs.110).aspx
Then save the InputStream to a byte array
using (MemoryStream stream = new MemoryStream())
{
file.InputStream.CopyTo(stream);
bytes = stream.ToArray();
}
Next assign the byte array to a SqlDbType.VarBinary stored procedure parameter to save it back to the database - assuming this is SQL Server.
We have an IOS application which send images to a asp.net web api application. So we convert images to Base64 then we send it to the web service as a string .
The problem is that the size of the image is big so the conversion to base64 takes a lot of time and the size of the result string is bigger than the initial image's size.
I need to know :
If another better way , instead of conversion to Base64, exists to convert the image before calling the web service
I used Gzip to compress/decompress an array of bytes like this :
static byte[] Compress(byte[] data)
{
using (var compressedStream = new MemoryStream())
using (var zipStream = new GZipStream(compressedStream, CompressionMode.Compress))
{
zipStream.Write(data, 0, data.Length);
zipStream.Close();
return compressedStream.ToArray();
}
}
Is it possible to convert image to array of bytes in IOS part then call the web service ? Or expose an object like compressedStream or GZipStream as a service argument?
Thanks,
it is possible to convert the image to a byte array, here's an SO answer which touches on that : how to convert byte array to image in ios
The biggest question however is this : do you actually need the image that big? You need to consider that the service will get slow once you have multiple users doing this and will more than likely grind to a halt which will make your app difficult/ slow to use.
You might want to consider reducing the image before sending it over. You can reduce the size, the quality and just make it smaller, then send the result over the wire.
Here is another SO post which touches on this : What's the easiest way to resize/optimize an image size with the iPhone SDK?
Of course if you are using xamarin and c# to build your app then it's even easier and you can find samples of code doing both these things.
I am trying to store some pictures into my SQL Server database from a Silverlight project, and I need some help, so my questions are:
How to convert an image to binary from a url to store it into my database (store all the image and not only the url)
Are there any other solutions, without passing by binary type? (since it exist the image type in SQL Server)
Finally, when the image is stored, how to read it from Silverlight?
Thank you in advance .
You'll want to convert the System.Drawing.Image to a byte array and save the byte array to the database.
System.Drawing.Image image;
System.IO.MemoryStream imageStream;
byte[] imageBytes;
// image = your image object
imageStream = new System.IO.MemoryStream();
image.Save(imageStream, System.Drawing.Imaging.ImageFormat.Jpeg); // Use whatever format your image is.
imageBytes = imageStream.ToArray();
// Save imageBytes to a DB column of type VARBINARY(MAX)
To get the data back into an System.Drawing.Image object from a byte array use System.Drawing.Image.FromStream(System.IO.Stream stream).
Download file contents and put into memory stream. See : http://www.csharp-examples.net/download-files/
Add bytes from memory stream into database
Get image with silverlight in C# by using the image class and method FromStream see http://msdn.microsoft.com/en-us/library/system.drawing.image.aspx
http://www.pitorque.de/MisterGoodcat/post/Storing-images-in-SQL-Server-with-RIA-Services.aspx
It is fully functional as in the user can select images from the local disk and upload them to the service where they are stored in the database. The user can retrieve a list of all images in the database and download them to the client for watching, and they can delete existing images from the database.
I have a functioning application in c#/.net that currently accepts raw image data in a bayer format from a set of embedded cameras and converts them to jpeg images. To save transmission time, I have modified the embedded devices to encode the images as jpegs prior to transmission. I'm an experienced embedded programmer but a total c#/.net noob. I have managed to modify the application to save the arrays to file with a jpeg name using this snippet: ( the offset of 5 is to skip header data in the transmission frame)
FileStream stream = File.Create(fileName);
BinaryWriter writer = new BinaryWriter(stream);
writer.Write(multiBuff.msgData, 5, multiBuff.dataSize - 5);
writer.Close();
The files open up fine, but now I want to treat the data as a bitmap without having to save & load from file. I tried the following on the data array:
MemoryStream stream = new MemoryStream(data);
BinaryReader reader = new BinaryReader(stream);
byte[] headerData = reader.ReadBytes(5);
Bitmap bmpImage = new Bitmap(stream);
But this throws a parameter not valid exception. As a newbie, I'm a little overwhelmed with all the classes and methods for images and it seems like what I'm doing should be commonplace, but I can't find any examples in the usual places. Any ideas?
I think you are looking for Bitmap.FromStream() :
Bitmap bmpImage = (Bitmap)Bitmap.FromStream(stream);
Actually using new Bitmap(stream) should have worked as well - this means that the data in the stream does not constitute a valid image - are you sure the jpg is valid? Can you save it to disk and open it i.e. in Paint to test?
You use the Image class.
Image image;
using (MemoryStream stream = new MemoryStream(data))
{
image = Image.FromStream(stream);
}
FYI it didn't work because reader.ReadBytes(5) returns the 5 first bytes of stream not the bytes after position 5