Android Question How to convert image to byte?

[Pravee7094]

Hi all,
When I used JRDC2, to convert image to byte is very simple. The example code is

        Dim BufferU () As Byte
        If ImageView.IsInitialized Then
            BufferU = CreateRequest.ImageToBytes(ImageView.Bitmap)
        End If

But I used PHP method, What is the exact code to convert image to byte?
I think I don't know what word used instead of CreateRequest.

Any body Help? Any suggestion?

Thanks
Praveen

 

[josejad]

Not sure, maybe this?

[B4X][XUI] Image to JPEG byte array with resize/quality options

Originally posted a B4J/inline Java version of this in the B4J Code Snippets (https://www.b4x.com/android/forum/threads/image-to-jpeg-byte-array-with-resize-quality-options.91746/). @Erel pointed out though that the XUI library had the functionality that I was doing with Java, so I decided to...

www.b4x.com

 

[emexes]

or maybe this?

 

[aeric]

Do you want to save the image into database blob field?

 

[josejad]

or maybe this?

Off Topic: As @Peter Simpson sign says: "Simplicity is the key"

 

[Pravee7094]

Do you want to save the image into database blob field?

bytea field in postgres

 

[emexes]

Off Topic

Lol that's a bit harsh ? my backup alternative solution also converts from an ImageView to bytes, it's just that the bytes are (probably) in a file

"Simplicity is the key"

and depending on what the OP is actually doing, bytes in a file might even be simpler than bytes in an array. ?

 

[aeric]

Sub Button1_Click
    PutImage(File.DirApp, "test.png")
End Sub

Sub PutImage(Dir As String, Filename As String)
    Dim cmd As DBCommand = CreateCommand("insert_file", Array As Object(Filename, File.ReadBytes(Dir, Filename)))
    Dim j As HttpJob = CreateRequest.ExecuteBatch(Array(cmd), Null)
    Wait For(j) JobDone(j As HttpJob)
    If j.Success Then
        Log("Inserted successfully!")
    End If
    j.Release
End Sub

CREATE TABLE "imagefile" (
    "id"    INTEGER,
    "filename"    TEXT,
    "filebyte"    BLOB,
    PRIMARY KEY("id" AUTOINCREMENT)
)

sql.insert_file=INSERT INTO imagefile (filename, filebyte) VALUES (?, ?)

 

[aeric]

File.DirApp

Sorry, I tested my code in B4J. In B4A, the Dir may be different.

 

[Pravee7094]

Sorry, I tested my code in B4J. In B4A, the Dir may be different.

Yes I think so, Me using PHP and Postgresql

 

[TILogistic]

see class DBRequestManager

'Reads a file and returns the file as a bytes array.
Public Sub FileToBytes(Dir As String, FileName As String) As Byte()
    Dim out As OutputStream
    out.InitializeToBytesArray(0)
    Dim In As InputStream = File.OpenInput(Dir, FileName)
    File.Copy2(In, out)
    out.Close
    Return out.ToBytesArray
End Sub
#if Not(B4J)
'Converts an image to a bytes array (for BLOB fields).
Public Sub ImageToBytes(Image As Bitmap) As Byte()
    Dim out As OutputStream
    out.InitializeToBytesArray(0)
    Image.WriteToStream(out, 100, "JPEG")
    out.Close
    Return out.ToBytesArray
End Sub
'Converts a bytes array to an image (for BLOB fields).
Public Sub BytesToImage(bytes() As Byte) As Bitmap
    Dim In As InputStream
    In.InitializeFromBytesArray(bytes, 0, bytes.Length)
    Dim bmp As Bitmap
    bmp.Initialize2(In)
    Return bmp
End Sub
#End If

 

[Peter Simpson]

You can use the following to learn the basics,
The attached codes loads an image file, converts it into bytes and then resaves that file again, but you can easily modify it to save to a database or to anywhere that you like.

 

[aeric]

Yes I think so, Me using PHP and Postgresql

If you use jRDC2, you don’t need to use PHP. If you posting to PHP then you should look into how to post multipart data using okHttpUtils2.