DosSetFileInfo
Sets file information.
Syntax
DosSetFileInfo (hf, ulInfoLevel, pInfoBuf, cbInfoBuf)
Parameters
- hf (HFILE) - input
- File handle.
- ulInfoLevel (ULONG) - input
- Level of file information being set.
- A value of 1 or 2 can be specified, as shown in the list below:
- 1 FIL_STANDARD Level 1 file information
- 2 FIL_QUERYEASIZE Level 2 file information
- The structures described in pInfoBuf indicate the information being set for each of these levels.
- pInfoBuf (PVOID) - input
- Address of the storage area containing the structures for file information levels.
- Level 1 File Information (ulInfoLevel == FIL_STANDARD)
- pInfoBuf contains the FILESTATUS3 data structure.
- Level 2 File Information (ulInfoLevel == FIL_QUERYEASY)
- pInfoBuf contains an EAOP2 data structure, and sets a series of EA name/value pairs.
- Input
- pInfoBuf is an EAOP2 data structure in which fpFEA2List points to a data area where the relevant FEA2LIST is to be found. fpGEA2List and oError are ignored.
- Output
- fpGEA2List and fpFEA2List are unchanged. The area pointed to by fpFEA2List is also unchanged. If an error occurred during the set, oError is the offset of the FEA2 where the error occurred. The return code is the error code corresponding to the condition generating the error. If no error occurred, oError is undefined.
- cbInfoBuf (ULONG) - input
- The length, in bytes, of pInfoBuf.
Return Code
ulrc (APIRET) - returns
DosSetFileInfo returns one of the following values:
- 0 NO_ERROR
- 1 ERROR_INVALID_FUNCTION
- 5 ERROR_ACCESS_DENIED
- 6 ERROR_INVALID_HANDLE
- 87 ERROR_INVALID_PARAMETER
- 122 ERROR_INSUFFICIENT_BUFFER
- 124 ERROR_INVALID_LEVEL
- 130 ERROR_DIRECT_ACCESS_HANDLE
- 254 ERROR_INVALID_EA_NAME
- 255 ERROR_EA_LIST_INCONSISTENT
Remarks
DosSetFileInfo is successful only when the file is opened for write access, and access by other processes is prevented by a deny-both sharing mode. If the file is already opened with conflicting sharing rights, any call to DosOpen will fail.
A value of 0 in the date and time components of a field does not change the field. For example, if both "last write date" and "last write time" are specified as 0 in the Level 1 information structure, then both attributes of the file are left unchanged. If either "last write date" or "last write time" are other than 0, both attributes of the file are set to the new values.
In the FAT file system, only the dates and times of the last write can be modified. Creation and last-access dates and times are not affected.
The last-modification date and time will be changed if the extended attributes are modified.
Example Code
This example creates a read-only file named "DOSFDEL.DAT", and then changes the file attributes. It uses DosForceDelete to delete the file so it can not be restored using UNDELETE.
#define INCL_DOSFILEMGR /* File Manager values */
#define INCL_DOSERRORS /* DOS error values */
#include <os2.h>
#include <stdio.h>
int main(VOID) {
UCHAR uchFileName[] = "DOSFDEL.DAT"; /* File we want to delete */
HFILE fhDelFile = 0; /* File handle from DosOpen */
FILESTATUS3 fsts3FileInfo = {{0}}; /* Information associated with file */
ULONG ulBufferSize = sizeof(FILESTATUS3); /* File info buffer size */
ULONG ulOpenAction = 0; /* Action taken by DosOpen */
APIRET rc = NO_ERROR; /* Return code */
/* Create a read-only file */
rc = DosOpen(uchFileName, &fhDelFile,
&ulOpenAction, 10L, FILE_READONLY,
OPEN_ACTION_CREATE_IF_NEW | OPEN_ACTION_OPEN_IF_EXISTS,
OPEN_ACCESS_READWRITE | OPEN_SHARE_DENYNONE, 0L);
if (rc != NO_ERROR) {
printf("DosOpen error: return code = %u\n", rc);
return 1; }
rc = DosQueryFileInfo(fhDelFile, FIL_STANDARD,
&fsts3FileInfo, ulBufferSize); /* Get standard info */
if (rc != NO_ERROR) {
printf("DosQueryFileInfo error: return code = %u\n", rc);
return 1;
} else { printf("File %s created read-only.\n",uchFileName); }
fsts3FileInfo.attrFile = FILE_NORMAL;
rc = DosSetFileInfo(fhDelFile, FIL_STANDARD,
&fsts3FileInfo, ulBufferSize);
if (rc != NO_ERROR) {
printf("DosSetFileInfo error: return code = %u\n", rc);
return 1;
}
rc = DosClose(fhDelFile);
/* should check (rc != NO_ERROR) here... */
/* Delete the file */
rc = DosForceDelete(uchFileName);
if (rc != NO_ERROR) {
printf("DosForceDelete error: return code = %u\n", rc);
return 1;
} else {
printf("File %s has been deleted.\n",uchFileName);
} /* endif */
return NO_ERROR;
}
