Android Question AsyncStreams write from Byte Array

Rusty · Jan 7, 2014

I have a byte array (png image) stored in a row in my SQLite database.
I need to extract the image and send it to a file on my PC server.
I'm using Prefix mode.
I am getting the image out of the SQLite table using

B4X:

Dim Blb() As Byte = RCsr.GetBlob("Data")

I believe the blb array will NOT be in LittleEndian. I have tried to copy the array using ByteConverter as follows:

B4X:

Dim Blb() As Byte = RCsr.GetBlob("Data")          
                Dim Blob(Blb.Length) As Byte
                Dim bc As ByteConverter
                bc.LittleEndian = True                                'convert to little endian
                bc.ArrayCopy(Blb, 0, Blob, 0, Blb.Length)
Astreams.Write(Blob)     'Send the byte array containing the image

and subsequently I would like to send the BLOB array to my server as a memory stream, if possible.
Apparently, the prefix mode "size" bytes are still not in the proper order, thus the data transmission size is distorted.
Is there a way to use Prefix mode to send an "in memory" byte array stream to the PC server without having to save it to a file and send from there?
Thanks,
Rusty

Rusty · Jan 7, 2014

Ok, after some experimentation and me gaining better understanding... I have found the following works:

B4X:

SUB SendByteArray(ByteArray() as Byte)
    Dim Blob(ByteArray.Length) As Byte
    Dim bc As ByteConverter
    bc.LittleEndian = True                                'convert to little endian
    bc.ArrayCopy(ByteArray, 0, Blob, 0, FileSize)
   
    Dim In As InputStream                                'create an input stream from which to read
    In.InitializeFromBytesArray(Blob, 0, Blob.Length)
    Astreams.Writestream(In, Blob.Length)                'Send the byte array containing the image
...

You can create an inputstream from a byte array and use WriteStream to send it.
I write this in case others make the same mistake as I have.
Regards,
Rusty

Android Question AsyncStreams write from Byte Array

Rusty

Well-Known Member

Rusty

Well-Known Member

Similar Threads

Android Question AsyncStreams write from Byte Array

Rusty

Well-Known Member

Rusty

Well-Known Member

Similar Threads

Privacy & Transparency

Privacy & Transparency