Extract Picture Data from a String

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Dears,

Thanks in advance. Can anybody help to solve my problem which is described below.

I did a socket application which is receiving data from a vehicle tracking unit.one example as follows:

Example- %%D1,100,0,0004[data...][0d0a]

Head -   %%D1
Amount of data package -100
The data package No.  - 0
Data Length -1024  (0004 (low bit in front, high bit in back) 0004= 0x0400=1024;)

data- Original Picture data -1024(maximum)
Tail -0x0d0a
Data in hex

From the above example, I want to extract picture data and need to store into the SQL table. SQL table columname is image and datatype is also image. After that, I want to display this image column to an aspx page.

expecting help asap.

Posted 21-Aug-10 8:45am

meenu s

Updated 23-Aug-10 8:08am

Deeksha Shenoy

v2

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The Zetta · Answer 1 · 2010-08-21T09:33:00

Solution 1

If I got that right, image data is in Hex format, right? So we can put the data in a bytearray, and then save it to database.

Once you extracted data and saved it to a bytearray, the rest will be easy. Here is a good example of how to do that:
Converting Hexadecimal String to/from Byte Array in C#[^].

You need to create a MemoryStream, see this: http://msdn.microsoft.com/en-us/library/e55f3s5k.aspx[^].

Then store it in database, see this:
http://www.codersource.net/asp-net/ado-net/reading-and-writing-images-from-sql-server.aspx[^].

--------------------

Regards

H.Maadani

Posted 21-Aug-10 9:33am

The Zetta

Updated 23-Aug-10 8:09am

v3

Comments

meenu s 22-Aug-10 18:16pm

dear friend ,can u help me from the first step.
i wanted to extract picture data from that string and need to put in a byte array.can u explain the code here for that?

eg
dim str as string="%%D1,100,0,0004[data...][0d0a]"

The Zetta 23-Aug-10 9:42am

Hi. please give me an actual string, so I can write the code for you. I mean, fill the data part. and, are brackets in the string? or just used to show limits?

meenu s 23-Aug-10 12:47pm

dear friend,bracket is not thre in the string.data part contains the information in hex (1024(maximum)).string always contains 0d0a which is the tail of the string.

The Zetta 23-Aug-10 12:52pm

OK, it is getting clearer. now let me now, % and comma are there? or not? header is always D110000004? or at least, its length is always 10 characters?

meenu s 25-Aug-10 0:16am

%%D1,100,0,0004[data...][0d0a]
comma and %% is thre always.which is seperating the data.
0004 means Data Length -1024(picture data)
0004 (low bit in front, high bit in back) 0004= 0x0400=1024;)