how to express the absolute path and relative path in window system

[Lykurg]

First you can use a resource file then you don't have such problems for the icons. See http://doc.trolltech.com/4.5/resources.html.
Second how looks the directories in windows?

/path/to/your/app/application.exe
/path/to/your/app/image/Current_Position.png

/path/to/your/app/application.exe
/path/to/your/app/image/Current_Position.png

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If so the image should normally be found.