Android Question concat two variable in byte

[Masoud44]

Hi ...
Is it possible to concat two variables in bytes for php post (var name and var value).
Is it possible to use postbyte in this way? I used combine and join instead of concat, but it didn't work

    Dim var As String="img="
    Dim bmp As Bitmap=ImageView1.Bitmap
    Dim i() As Byte = ImageToBytes(bmp)
    Dim vb() As Byte=var.GetBytes("UTF8")
    Dim data() As Byte = Concat(vb, i)    ' vb+i  such as & for concat two string
    Dim j As HttpJob
    j.Initialize("insertimg", Me) 'jobdon
    j.PostBytes(ServerIP & "insert.php", data)

Sub concat(vname as byte,image as byte) as byte
    dim c as byte
    c=vname+image ??????????
    return c
End Sub

 

[teddybear]

Hi ...
Is it possible to concat two variables in bytes for php post (var name and var value).
Is it possible to use postbyte in this way? I used combine and join instead of concat, but it didn't work

Sub concat(vname as byte,image as byte) as byte
    dim c as byte
    c=vname+image ??????????
    return c
End Sub

The vname and image should be byte array and it should return a byte array in sub concat
Do concat using ByteConverter library.

Sub concat(vname() As Byte, image() As Byte) As Byte()
    Dim c(vname.Length+image.Length) As Byte
    Dim bc As ByteConverter
    bc.ArrayCopy(vname, 0, c, 0, vname.Length)
    bc.ArrayCopy(image,0, c, vname.Length, image.Length)
    Return c  
End Sub

 

[DonManfred]

Is it possible to concat two variables in bytes for php post (var name and var value).
Is it possible to use postbyte in this way? I used combine and join instead of concat, but it didn't work

What are you doing on the serverside with these concatenation? You can not split them afterwards.

What exactly are you trying to archieve?

 

[Masoud44]

The vname and image should be byte array and it should return a byte array in sub concat
Do concat using ByteConverter library.

Sub concat(vname() As Byte, image() As Byte) As Byte()
    Dim c(vname.Length+image.Length) As Byte
    Dim bc As ByteConverter
    bc.ArrayCopy(vname, 0, c, 0, vname.Length)
    bc.ArrayCopy(image,0, c, vname.Length, image.Length)
    Return c 
End Sub

thank you for answer.
I'm check it

 

[Masoud44]

What are you doing on the serverside with these concatenation? You can not split them afterwards.

I hope that PHP itself will do this with the post command, and if it doesn't, I will try to it myself.
this is done in the code below, and in this case, PHP separates the variable name from the variable content with the post command

    Dim data As String
    Dim imageStr As String = BitmapToString(image)   
    data="img="&imageStr
    Dim j As HttpJob
    j.Initialize("insertimg", Me)    
    j.postbyte(ServerIP & "insert.php",data.GetBytes("UTF8"))

What exactly are you trying to archieve?

I want to keep the smallest possible size of an image in the database, which means about thirty percent less than what happens in the above code.

 

[Masoud44]

The vname and image should be byte array and it should return a byte array in sub concat
Do concat using ByteConverter library.

Sub concat(vname() As Byte, image() As Byte) As Byte()
    Dim c(vname.Length+image.Length) As Byte
    Dim bc As ByteConverter
    bc.ArrayCopy(vname, 0, c, 0, vname.Length)
    bc.ArrayCopy(image,0, c, vname.Length, image.Length)
    Return c 
End Sub

This code is the same as the combine code:

Sub CombineBytes(arr1() As Byte, arr2() As Byte) As Byte()
    Dim res(arr1.Length + arr2.Length) As Byte
    Dim bc As ByteConverter 'ByteConverter library
    bc.ArrayCopy(arr1, 0, res, 0, arr1.Length)
    bc.ArrayCopy(arr2, 0, res, arr1.Length, arr2.Length)
    Return res
End Sub

The post command in PHP recognizes the name of the variable, but the content of the variable is not the image byte.

 

[teddybear]

    Dim data As String
    Dim imageStr As String = BitmapToString(image)  
    data="img="&imageStr
    Dim j As HttpJob
    j.Initialize("insertimg", Me)   
    j.postbyte(ServerIP & "insert.php",data.GetBytes("UTF8"))

I want to keep the smallest possible size of an image in the database, which means about thirty percent less than what happens in the above code.

It does EncodeBase64 in BitmapToString(image), do you do DecodeBase64 for this?

 

[Masoud44]

It does EncodeBase64 in BitmapToString(image), do you do DecodeBase64 for this?

I have no problem with this code. This code is complete and correct
You should zoom in on post #1

 

[teddybear]

The post command in PHP recognizes the name of the variable, but the content of the variable is not the image byte.

This is the question I asked on #post 7. what is the content of the variable? bytes of encodebase64 ?

 

[Masoud44]

This is the question I asked on #post 7. what is the content of the variable? bytes of encodebase64 ?

About which piece of code do you want variable content? Because your reply of my posts is different in post 7 and post 9.

 

[Masoud44]

This is the question I asked on #post 7. what is the content of the variable? bytes of encodebase64 ?

lets me to say this way, when I use encodebase64 and decodebase64, there is no problem, but at in this way the size of the file increases, as a result, the speed of the application decreases. For this reason, I am trying to save the images in the database without using encode to occupy 30% less space in the database to increase the speed of reading and writing images.

 

[DonManfred]

lets me to say this way, when I use encodebase64 and decodebase64, there is no problem, but at in this way the size of the file increases, as a result, the speed of the application decreases. For this reason, I am trying to save the images in the database without using encode to occupy 30% less space in the database to increase the speed of reading and writing images.

base64 adds 30% to it. Save the BYTES instead.

Honestly storing Images in the Database is a very BAD databasedesign.

 

[DonManfred]

All in all it is the WRONG solution to concat a String and bytes.
Use httpjob.PostMultiPart to upload a Files together with other variables.

Note that the PHP must be aware on how to proceed the data.

 

[Masoud44]

base64 adds 30% to it. Save the BYTES instead.

I know but how?

Honestly storing Images in the Database is a very BAD databasedesign.

maybe you right, but for what I do,i think this method is better.

 

[teddybear]

I have tested the sub concat with PHP server, it works fine.
As DonManfred said, storing Image to database is not good choice.

​

 

[DonManfred]

I know but how?

The question in #1 is answered.

If you have any new question you should create a new thread for the new question.

 

[Masoud44]

I have tested the sub concat with PHP server, it works fine.

I congratulate you very well.
Please upload it along with the php code.

 

[DonManfred]

I know but how?

See #13. Use Postmustipart. Your php must be able to handle it though.

Away from that the forumsearch IS working. Just use it!

 

[Masoud44]

See #13. Use Postmustipart. Your php must be able to handle it though.

Away from that the forumsearch IS working. Just use it!

Yes, I had seen and followed post #13, but I think it was related to uploading images to the server and saving the addresses of the files in the database.
If it is not like this, then I did not understand it.
Anyway, thank you for taking the time to answer.

 

[teddybear]

I congratulate you very well.
Please upload it along with the php code.

B4X

    Dim job As HttpJob
    job.Initialize("", Me)
    job.PostBytes("http://localhost/ch01/test.php", concat("img=".GetBytes("utf8"),File.ReadBytes(File.DirAssets,"image.jpg")))

PHP

<?php

$rawPostData = file_get_contents('php://input');

$byteArray = substr($rawPostData,4);

file_put_contents("image.jpg",$byteArray);

echo "Received byte data length: " . strlen((String)$byteArray);
?>