Jeff Dunlop wrote in a message to All:

 JD> I would like to detect whether a device found by
 JD> DosQueryFSInfo is read-only. I know that if the file system
 JD> is CDFS, it's a CD-Rom, but this seems incomplete to me. Is
 JD> there a DevIOCtl command that will provide this information?

Call DosQueryPathInfo() against the root directory of the device.

-- Mike


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#include 

#define INCL_DOSFILEMGR
#define INCL_NOPMAPI
#include 

#define FILE_DRIVE (0x0008)   /* undocumented */


int main(int argc, char *argv[]);

void printdtfmt(FDATE fdp, FTIME ftp) {

   const UCHAR dtfmt[] = " \t%04u-%02u-%02u %02u:%02u:%02u";

   printf(dtfmt, fdp.year+1980, fdp.month, fdp.day,
         ftp.hours, ftp.minutes, ftp.twosecs);
   return;
}

int main(int argc, char *argv[]) {

   FILESTATUS3 f;
   APIRET rc;

   if(argc < 2) {

      printf("\nUsage: \tPCHK \n");
      exit(1);
   }


   memset(&f, sizeof(f), 0);
   rc = DosQueryPathInfo(argv[1], FIL_STANDARD, (PVOID)&f, sizeof(f));


   printf("\nPath: \t\t%s", argv[1]);
   printf("\nReturn: \t%lu", (ULONG)rc);
   if(rc != 0)   printf(" \t(Invalid)");

   printf("\nCreated: ");
   printdtfmt(f.fdateCreation, f.ftimeCreation);

   printf("\nAccessed: ");
   printdtfmt(f.fdateLastAccess, f.ftimeLastAccess);

   printf("\nModified: ");
   printdtfmt(f.fdateLastWrite, f.ftimeLastWrite);

   printf("\nData size: \t%lu (bytes)", f.cbFile);
   printf("\nAlloc size: \t%lu (bytes)", f.cbFileAlloc);

   printf("\nAttribute: \t%08Xh \t", f.attrFile);
   if(f.attrFile == FILE_NORMAL)     printf(" Normal");
   if(f.attrFile & FILE_READONLY)    printf(" Read-Only");
   if(f.attrFile & FILE_HIDDEN)      printf(" Hidden");
   if(f.attrFile & FILE_SYSTEM)      printf(" System");
   if(f.attrFile & FILE_DRIVE)       printf(" Drive");
   if(f.attrFile & FILE_DIRECTORY)   printf(" Directory");
   if(f.attrFile & FILE_ARCHIVED)    printf(" Archive");
   if(f.attrFile & 0xFFFFFFC0)       printf(" (?)");

   printf("\n");
   return(0);
}

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Here is what an HPFS hard disk looks like:

Path:           c:\
Return:         0
Created:        1995-03-19 20:58:27
Accessed:       1995-03-19 20:58:27
Modified:       1995-03-19 20:58:27
Data size:      5 (bytes)
Alloc size:     512 (bytes)
Attribute:      00000010h        Directory

Here is what a CD-ROM looks like:

Path:           e:\
Return:         0
Created:        1980-00-00 00:00:00
Accessed:       1980-00-00 00:00:00
Modified:       1980-00-00 00:00:00
Data size:      0 (bytes)
Alloc size:     0 (bytes)
Attribute:      00000011h        Read-Only Directory


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