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Zitat von »"bassdscho"«

wie kann ich einzelne Einträge der Checkbox löschen und erstellen? Ich arbeite mit Windows Forms.

Zitat

LB_INSERTSTRING Message

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An application sends an LB_INSERTSTRING message to insert a string into a list box. Unlike the LB_ADDSTRING message, the LB_INSERTSTRING message does not cause a list with the LBS_SORT style to be sorted.

Syntax


To send this message, call the SendMessage function as follows.
lResult = SendMessage( // returns LRESULT in lResult (HWND) hWndControl, // handle to destination control (UINT) LB_INSERTSTRING, // message ID (WPARAM) wParam, // = (WPARAM) () wParam; (LPARAM) lParam // = (LPARAM) () lParam; );
Parameters

wParam
Specifies the zero-based index of the position at which to insert the string. If this parameter is –1, the string is added to the end of the list.
Microsoft Windows 95/Windows 98/Windows Millennium Edition (Windows Me) : 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 list box is limited only by available memory.

lParam
Pointer to the null-terminated string to be inserted. If you create the list box with an owner-drawn style but without the LBS_HASSTRINGS style, the value of the lParam parameter is stored as item data instead of the string it would otherwise point to. You can send the LB_GETITEMDATA and LB_SETITEMDATA messages to retrieve or modify the item data.
Return Value

The return value is the index of the position at which the string was inserted. If an error occurs, the return value is LB_ERR. If there is insufficient space to store the new string, the return value is LB_ERRSPACE.



Remarks

The LB_INITSTORAGE 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_INSERTSTRING messages take the shortest possible time. You can use estimates for the wParam and lParam parameters. If you overestimate, the extra memory is allocated; if you underestimate, the normal allocation is used for items that exceed the requested amount.

If the list box has WS_HSCROLL style and you insert a string wider than the list box, send an LB_SETHORIZONTALEXTENT message to ensure the horizontal scrollbar appears.

Microsoft Windows NT/Windows 2000/Windows XP : For an ANSI application, the system converts the text in a list box to Unicode using CP_ACP. This can cause problems. For example, accented Roman characters in a non-Unicode list box in Japanese Windows will come out garbled. To fix this, either compile the application as Unicode or use an owner-drawn list box.

Message Information

Header Declared in Winuser.h, include Windows.h
Minimum operating systems Windows 95, Windows NT 3.1

See Also

List Boxes, LB_ADDSTRING, LB_SELECTSTRING, LB_SETHORIZONTALEXTENT

	C-/C++-Quelltext
1 2 3	myListCtrl.InsertItem( 1 // Welche Columne ,"ItemText"); //Dein Text.