How to make your own winapi function?

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Is it possible to make your own winapi function?
To be more specific, I would like to make a function like GetPixel with identical parameters (_In_ HDC hdc,_In_ int nXPos, _In_ int nYPos). What information should I also know to make my own function, is it a secret of windows or something else?
Thanx for any help :)

Posted 10-Mar-14 22:07pm

novadivlja

Updated 10-Mar-14 23:23pm

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CPallini · Accepted Answer · 2014-03-10T22:31:00

Solution 1

Of course you can make an API.
The code for GetPixel-like function would probably end up in a call to the actual GetPixel, that is often an API leverages an existing one.
The secrets for implementing an API are: make the code robust, write good documentation (there are technical details of course, like, for instance, creating a DLL or a static library).

Posted 10-Mar-14 22:31pm

CPallini

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novadivlja 11-Mar-14 5:02am

Maybe i didn't enough clear -> when you call "GetPixel" you don't know what is happen behind the code are not visible! Now what i want is to make my custom function which will do same work as "GetPixel", but don't know what data structure to call. What would you do if you are on linux (where you don't have GepPixel function), how would you find there information of pixel?

CPallini 11-Mar-14 5:13am

GDI implementation details is not available, as far as I know. However you may have a glimpse of reading this:
http://msdn.microsoft.com/en-us/library/windows/hardware/ff566540(v=vs.85).aspx

On Linux I would use an existing API (while aiming at portable code I wouldn't try to write a Windows-like API, instead, I would try to implement a OS agnostic API).

novadivlja 11-Mar-14 5:25am

thnx for comment and link that will be my start point :)

CPallini 11-Mar-14 5:47am

You are welcome.

How to make your own winapi function?

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