c - What is the purpose of LVCOLUMN.cchTextMax and LVITEM.cchTextMax? -


i have tried set values of lvcolumn.cchtextmax , lvitem.cchtextmax random value (less corresponding string length) , worked, did work mistake or these fields not necessary set?

i have seen examples not use these fields, example: http://www.codeproject.com/articles/9148/c-functions-to-insert-columns-items-and-subitems-i

the documentation lvitem structure has following on cchtextmax member:

this member used when structure receives item attributes. ignored when structure specifies item attributes. example, cchtextmax ignored during lvm_setitem , lvm_insertitem. read-only during lvn_getdispinfo , other lvn_ notifications.

unless using structure retrieve item information, member ignored. when receiving data have pass pointer buffer psztext, , communicate size through cchtextmax member.

this common pattern throughout windows api, same structure used set , query values. semantics of individual members depend on direction. other common structures, used in similar fashion include tvitem or menuiteminfo, example.


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