binary data to what image format?

blackhorse

I transferred jpg image to binary and transferred them back to jpg before. It is ok. Because it was from jpg to jpg.

Now I would need to read image as binary string from wsdl (I don't have them yet), and I don't know the binary string was for what image format, or does it matter? Is there anyway I can tell from the binary string itself to detect it is a jpg, gif, or png?

Somehow I have to know these binary string are for what image format, jpg, gif or png if I try to display it, or save it as a image file, right?

Any people has some sample codes to recommend?

Thanks!

bradgrafelman

blackhorse wrote:
I transferred jpg image to binary and transferred them back to jpg before. It is ok. Because it was from jpg to jpg.

There is no such thing as "transferring" a file from a JPEG image into a "binary" format. It's all binary data.

blackhorse wrote:
Is there anyway I can tell from the binary string itself to detect it is a jpg, gif, or png?

I'm not sure of a simple PHP class/library that can do that, but I'm sure there's one out there. If nothing else, you could probably use something like MIME_Type.

blackhorse

Thanks for correcting me. Yeah, I mean read in the jpg file, save the binary data in database and get the data from database, display it as jpg file. or save as jpg file.

dagon

you can store it in the db as a blob, but why not just store the file name in the db and the file in the file system (sounds like the right place for it)

blackhorse

dagon;10960377 wrote:
you can store it in the db as a blob, but why not just store the file name in the db and the file in the file system (sounds like the right place for it)

Yes, that is what I am going to do. I was wondering do I have to know the image format these binary codes (which I would read from wsdl) are, or I can just go ahead to save it as jpg file in a folder and save the name in the database.

dagon

I don't understand how\where wsdl is involved.

mrbaseball34

It is not difficult to test using MIME type IF you are able to use the file() function.
However, I don't know if you can use it on file streams which you would be loading from the WSDL.

blackhorse

dagon;10960379 wrote:
I don't understand how\where wsdl is involved.

My old project was that I get jpg file, save the binary codes in database, and retrieve the binary codes from database and display the image etc.

This is a new project, the customer would give me wsdl to get the binary codes of the image. I would either save it in my database or save it as image file in my server's folder. I was asking if I need to know or how could I find the image format from the binary codes I get. (In my previous project I know it is jpg and deal with it as jpg in the whole process.)

Thanks!