CB_DIR
wParam = (WPARAM) (UINT) uAttrs; /* file attributes */
lParam = (LPARAM) (LPCTSTR) lpszFileSpec; /* address of filename */
An application sends a CB_DIR message to add a list of file names to the list box of a combo box.
uAttrs
Value of wParam. Specifies the attributes of the files to be added to the list box. It can be any combination of the following values:
| Value | Meaning |
| 0x00000000 | File can be read from or written to. |
| 0x00000001 | File can be read from, but not written to. |
| 0x00000002 | File is hidden and does not appear in a directory listing. |
| 0x00000004 | File is a system file. |
| 0x00000010 | The name specified by the lpszFileSpec parameter specifies a directory. |
| 0x00000020 | File has been archived. |
| 0x00004000 | Include all drives that match the name specified by the lParam parameter. |
| 0x00008000 | Exclusive flag. If the exclusive flag is set, only files of the specified type are listed. Otherwise, files of the specified type are listed in addition to “normal” files. |
lpszFileSpec
Value of lParam. Points to the null-terminated string that specifies the filename to add to the list. If the filename contains any wildcards (for example, *.*), all files that match and have the attributes specified by the uAttrs parameter will be added to the list.
The return value is the zero-based index of the last filename added to the list. The return value is CB_ERR if an error occurs; the return value is CB_ERRSPACE if insufficient space is available to store the new strings.
The CB_DIR message may be used as either a wide-character message (where text arguments must use Unicode) or an ANSI message (where text arguments must use characters from the Windows 3.x character set installed).
DlgDirList, DlgDirListComboBox, CB_ADDSTRING, CB_INSERTSTRING