Microsoft KB Archive/104311

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INFO: 32-Bit Scroll Ranges

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Q104311

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The information in this article applies to:


 * Microsoft Win32 Software Development Kit (SDK)

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SUMMARY
You can use 32-bit scroll ranges by calling GetScrollPos; however, you cannot get 32-bit positions for notifications sent while thumb tracking, that is, via the SB_THUMBPOSITION message. This is because thumb position information is not queryable via an application programming interface (API). You only can obtain the 32-bit scroll information only before or after the scroll has taken place.

The scroll bar APIs allow setting a scroll range up to 0x7FFFFFFF via SetScrollRange, and setting a scroll position within that range using SetScrollPos. If the WM_HSCROLL or WM_VSCROLL message is processed, the information returned for scroll bar position, nPos, is only a 16-bit value. To obtain the 32-bit information, the GetScrollPos API must be used.

Additional query words: scrollbar

Keywords : kbCtrl kbOSWinNT kbOSWin2000 kbScrollBar kbSDKWin32 kbGrpDSUser kbOSWin95 kbOSWin98

Issue type : kbinfo

Technology : kbWin32SDKSearch kbAudDeveloper kbSDKSearch kbWin32sSearch