How to join the picture?

[daijianshusheng]

I would like to add a picture to the PDF file, I would like to ask how to do? Is to do a picture converted to PDF format? How to operate?

[mipmip]

Have a look at the bottom of this page: http://resources.infosecinstitute.com/pdf-file-format-basic-structure/

[daijianshusheng]

I finished reading the document, is the relationship between a tree. I have read the main.c file which is written in a rectangular block of code, but I do not know how to generate the following code? By what way, I don't quite understand.
As follows:
NSData *data2 = "q /Cs1 cs 0.4 0 0.6 sc 250 600 100 100 re f q" dataUsingEncoding:NSASCIIStringEncoding];

I don't understand q /Cs1 cs 0.4 0 0.6 sc 250 600 100 100 re f q 。I want to know how this string is converted.Can I convert a picture into a code like this?

[mipmip]

I might create an exact, how this should be done.

[daijianshusheng]

Well, is needed. I don't know the main.c file in the picture now is how to generate the. I think a picture can be converted to a specific location of this code into another PDF.