WinQueryLboxItemText
This macro fills the buffer with the text of the indexed item. It returns the length of the text.
Syntax
WinQueryLboxItemText(hwndLbox, index, psz, cchMax)
Parameters
- hwndLbox (HWND) - Input
- List box handle.
- index (SHORT) - Input
- Index of the listbox item.
- psz (PSZ) - Input
- Pointer to a null terminated string.
- cchMax (SHORT) - Input
- Maximum number of characters allocated to the string.
- lRetTxtL (LONG) - returns
- Actual text length copied.
Remarks
This macro is defined as&colon.
#define WinQueryLboxItemText(hwndLbox, index, psz, cchMax) \ ((LONG)WinSendMsg(hwndLbox, \ LM_QUERYITEMTEXT, \ MPFROM2SHORT((index), (cchMax)), \ MPFROMP(psz)))
This macro requires the existence of a message queue.
Example Code
#define INCL_WINWINDOWMGR /* Or use INCL_WIN, INCL_PM, */
#include <os2.h>
HWND hwndLbox; /* List box handle. */
SHORT index; /* Index of the listbox item. */
PSZ psz; /* Pointer to a null terminated string. */
SHORT cchMax; /* Maximum number of characters allocated to the string. */
LONG lRetTxtL; /* Actual text length copied. */
lRetTxtL = WinQueryLboxItemText(hwndLbox,
index, psz, cchMax);
This example uses WinQueryLboxItemText to copy all of the list box items into a buffer.
#define INCL_WINLISTBOXES
#define INCL_WINWINDOWMGR
#include <OS2.H>
LONG cWindows;
char *szTemp;
HWND hwndLB;
SHORT maxchar, index = 0;
cWindows = WinQueryLboxCount(hwndLB);
/* allocate a buffer for cWindows items. */
DosAllocMem((PPVOID)&szTemp,
(ULONG)cWindows*256*sizeof(char),
PAG_READ |
PAG_WRITE |
PAG_COMMIT);
/* loop through all of the items; copying each */
/* one the buffer. */
while (index <= cWindows)
{
maxchar = WinQueryLboxItemTextLength(hwndLB,index);
WinQueryLboxItemText(hwndLB,
index++,
szTemp,
maxchar);
szTemp+=maxchar; /* increment pointer by number */
/* of bytes copied. */
}