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Overview |
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Group |
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Quick Info
Windows NT
| Yes
| Win95
| Yes
| Win32s
| No
| Import Library
| -
| Header File
| winuser.h
| Unicode
| No
| Platform Notes
| None
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CB_INITSTORAGE
An application sends the CB_INITSTORAGE message before adding a large number
of items to the list box portion of a combo box. This message allocates memory
for storing list box items.
CB_INITSTORAGE
wParam = (WPARAM) (int) cItems; // number of items to add
lParam = (LPARAM) (DWORD) cb; // amount of memory to allocate, in bytes
Parameters
cItems
Specifies the number of items to add.
cb
Specifies the amount of memory to allocate for item strings, in bytes.
Return Values
If the message is successful, the return value is the maximum number of items
that the memory object can store.
If the message fails, the return value is CB_ERR.
Remarks
Windows 95: This message helps speed up the initialization of combo boxes that have a
large number of items (over 100). It reserves the specified amount of memory so
that subsequent CB_ADDSTRING, CB_INSERTSTRING, and CB_DIR 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
CB_ADDSTRING, CB_DIR, CB_INSERTSTRING
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