Please can somebody explain the the meaning following expression found in MSDN?

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Please can somebody explain the the meaning following expression found in MSDN?

In the description for INT_PTR , it says,"A signed integer type for pointer precision.Used when casting a pointer to an integer for pointer arithmetic."

What does it mean by " casting a pointer to integer for pointer arithmetic."Can anyone explain what this means with a line of code?

See related questions at:

http://www.codeproject.com/Questions/729747/Please-when-is-it-best-right-to-use-the-new-data-t

http://www.codeproject.com/Questions/729713/Can-the-following-code-run-on-64bit-system

The msdn page is located at:

http://msdn.microsoft.com/en-us/library/windows/desktop/aa383751(v=vs.85).aspx

Posted 18-Feb-14 9:33am

Gbenbam

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Matt T Heffron 18-Feb-14 15:44pm

Instead of posting this as a new question, you should have just used the "Improve question" on your question 1 minute earlier.

OriginalGriff 18-Feb-14 16:10pm

I've deleted the earlier question, since this contains slightly more info...

Matt T Heffron 18-Feb-14 16:12pm

Deleting is "above my pay grade" ;-)

OriginalGriff 18-Feb-14 16:25pm

I have the Power Of Greyskull: spammers beware! :laugh:

Sergey Alexandrovich Kryukov 18-Feb-14 21:18pm

You forgot to add "sinister" to "laugh"... :-)
—SA

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bling · Answer 1 · 2014-02-18T10:25:00

The "_PTR" types (like DWORD_PTR) are useful in APIs where the meaning of the value is user-defined. Several Windows APIs allow storing a user defined data value. This could be an integer or a pointer. Trying to store a 64 bit pointer in a 32 bit DWORD won't work. DWORD_PTR takes care of that.

Examples: ComboBox, ListBox, ListCtrl, TreeCtrl.

http://msdn.microsoft.com/en-us/library/43y9kx83.aspx
http://msdn.microsoft.com/en-us/library/287styts.aspx