I am having a problem understanding the DosQueryFSInfo function as it is
not returning with the FSA requested, but always a " " when using the
FSIL_ALLOC parameter.

#define INCL_DOSFILEMGR   /* File Manager values */
#include 
#include 
#include 
int main(int argc, char *argv[]) {
UCHAR  szDeviceName[25];  /* Device name or drive letter string */
ULONG  ulOrdinal;        /* Ordinal of entry in name list      */
ULONG  ulFSAInfoLevel;   /* Type of attached FSD data required */
ULONG  cbBuffer;         /* Buffer length                      */
PBYTE  pszFSDName;       /* pointer to FS name                 */
PBYTE  pFSData;          /* pointer to FS data                 */
APIRET rc;               /* Return code                        */
ULONG   DriveNumber;   /* Drive number */
ULONG   FSInfoLevel;   /* File system data required */
UCHAR   FSInfoBuf[40]; /* File system info buffer */
ULONG   FSInfoBufSize; /* File system info buffer size */
BYTE    fsqBuffer [ sizeof(FSQBUFFER2) + (3 * CCHMAXPATH) ];
PFSQBUFFER2  pfsqBuffer = (PFSQBUFFER2) fsqBuffer;
ulOrdinal = 0;                /* ignored for this info level */
cbBuffer = sizeof(fsqBuffer); /* Length of data buffer */
DriveNumber = toupper(argv[1][0])-'A';    /* Specify drive C */
DriveNumber++;
FSInfoLevel = FSIL_ALLOC;
                    /* Indicate that file system allocation */
                    /*   information is requested           */

FSInfoBufSize = 40; /* Size of return data buffer */

rc = DosQueryFSInfo(DriveNumber, FSInfoLevel, FSInfoBuf,
                        FSInfoBufSize);
                    /* On successful return, the data buffer */
                    /*   FSInfoBuf contains a set of         */
                    /*   information about space allocation  */
                    /*   within the specified file system    */

if (rc != 0)  printf("DosQueryFSInfo error: return code = %ld", rc);
else printf("Disk information Buffer contains:\n\t%s\n",FSInfoBuf);
return 0;
}

After a bit of playing around and then displaying each position of the
FSInfoBuf I now realize that different values are returned, BUT what is
the format of the information?  40 bytes leaves me lots of
possibilities!

David Johnson


 * You can't make a silk purse out of a sow's ear.
---
 * RoseReader 2.50* P004198 Entered at [PROGRAMMERS GLD]

--- QScan v1.067b