An application sends a CB_DIR message to add a list of filenames to the list box of a combo box.
CB_DIR
wParam = (WPARAM) (UINT) uAttrs; // file attributes
lParam = (LPARAM) (LPCTSTR) lpszFileSpec; // address of filename
Parameters
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 |
| DDL_ARCHIVE | Includes archived files. |
| DDL_DIRECTORY | Includes subdirectories. Subdirectory names are enclosed in square brackets ([ ]). |
| DDL_DRIVES | Includes drives. Drives are listed in the form [-x-], where x is the drive letter. |
| DDL_EXCLUSIVE | Includes only files with the specified attributes. By default, read-write files are listed even if DDL_READWRITE is not specified. |
| DDL_HIDDEN | Includes hidden files. |
| DDL_READONLY | Includes read-only files. |
| DDL_READWRITE | Includes read-write files with no additional attributes. |
| DDL_SYSTEM | Includes system 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 are added to the list.
Return Values
The return value is the zero-based index of the last filename added to the list. If an error occurs, the return value is CB_ERR. If insufficient space is available to store the new strings, it is CB_ERRSPACE.
See Also
CB_ADDSTRING, CB_INSERTSTRING, DlgDirList, DlgDirListComboBox