please dont rip this site Prev Next

LB_INITSTORAGE Overview  Group

Allocates memory for storing list box items. An application sends this message before adding a large number of items to a list box.


wParam = (WPARAM) (int) cItems;  // number of items to add 

lParam = (LPARAM) (DWORD) cb;   // amount of memory to allocate, in bytes 



Specifies the number of items to add.

Windows 95: The wParam parameter is limited to 16-bit values. This means list boxes cannot contain more than 32,767 items. Although the number of items is restricted, the total size in bytes of the items in a listbox is limited only by available memory.

Specifies the amount of memory, in bytes, to allocate for item strings.

Return Values

The return value is the maximum number of items that the memory object can store before another memory reallocation is needed, if successful. It is LB_ERRSPACE if not enough memory is available.


Windows 95: This message helps speed up the initialization of list boxes that have a large number of items (more than 100). It reserves the specified amount of memory so that subsequent LB_ADDSTRING, LB_INSERTSTRING, LB_DIR, and LB_ADDFILE messages take the shortest possible time. You can use estimates for the cItems and cb parameters. If you overestimate, the extra memory is allocated; if you underestimate, the normal allocation is used for items that exceed the requested amount.

Windows NT: This message is not needed on Windows NT. It does not reserve the specified amount of memory, because available memory is virtually unlimited. The return value is always the value specified in the cItems parameter.

See Also


file: /Techref/os/win/api/win32/mess/src/msg10_16.htm, 2KB, , updated: 2000/4/7 12:20, local time: 2022/8/7 23:40,

 ©2022 These pages are served without commercial sponsorship. (No popup ads, etc...).Bandwidth abuse increases hosting cost forcing sponsorship or shutdown. This server aggressively defends against automated copying for any reason including offline viewing, duplication, etc... Please respect this requirement and DO NOT RIP THIS SITE. Questions?
Please DO link to this page! Digg it! / MAKE!


After you find an appropriate page, you are invited to your to this massmind site! (posts will be visible only to you before review) Just type a nice message (short messages are blocked as spam) in the box and press the Post button. (HTML welcomed, but not the <A tag: Instead, use the link box to link to another page. A tutorial is available Members can login to post directly, become page editors, and be credited for their posts.

Link? Put it here: 
if you want a response, please enter your email address: 
Attn spammers: All posts are reviewed before being made visible to anyone other than the poster.
Did you find what you needed?


Welcome to!

Site supported by
sales, advertizing,
& kind contributors
just like you!

Please don't rip/copy
(here's why

Copies of the site on CD
are available at minimal cost.

Welcome to!