32-Bit Scroll Ranges

Last reviewed: November 2, 1995
Article ID: Q104311

The information in this article applies to:

Microsoft Win32 Application Programming Interface (API) included with:
```
    - Microsoft Windows NT versions 3.1 and 3.5
```

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 reference words: 3.10 3.50 scrollbar
KBCategory: kbui
KBSubcategory: UsrCtl

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Last reviewed: November 2, 1995
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