Q:
I know PDFTron PDFNet API supports all mobile platforms, but my interest is into know if I can work with all mobile platforms with the same C++ code both in Android and iOS. Can you help me with that?
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A:
You can use PDFNet Mobile SDK to view, read, write, or edit PDF on all mobile and desktop platforms. The API is the same on all platforms.
As a starting point please take a look at the samples under Creation sample group: http://www.pdftron.com/pdfnet/samplecode-grouped.html
... specifically you may want to take a look at ElementBuilder, AddImage, Pattern, Stamper, and UnicodeWrite samples.
Please note that besides platform specific bindings (e.g. Java, C#, Objective-C) you can also access PDFNet with the same C/C++ interface from all platforms (Android, iOS, WinRT, etc). All SDKs comes with the C/C++ Headers so the only difference is that you would be looking at C/C++ samples (http://www.pdftron.com/pdfnet/samplecode.html) rather than Java, Objective-C etc.