winapi - Get total size of a hard disk in c++ windows -


i trying total size of physical drive (unallocated + primary partitions + extended partitions size).

i have disk name \\.\physicaldrivex

i tried using getdiskfreespaceex doesn't give correct result when partition extended partition, in case returns total size of partition.

bool ret = false; ularge_integer ulfreespace; ularge_integer ultotalspace; ularge_integer ultotalfreespace; __int64 ultotalusedspace = 0; getdiskfreespaceex(szbuffer, &ulfreespace, &ultotalspace, &ultotalfreespace); *disksize = ultotalspace.quadpart;

i can partition info using deviceiocontrol using ioctl_disk_get_drive_layout_ex getting confused extended partition size.

is there way can accurately total size of hard disk in c++ on windows ??

since you're talking physical disk , not partitions, take @ deviceiocontrol.

example there, includes calculation of total disk size in wmain:

#include <windows.h> #include <winioctl.h> #include <stdio.h>  bool getdrivegeometry(lpwstr wszpath, disk_geometry *pdg) {   handle hdevice = invalid_handle_value;  // handle drive examined    bool bresult   = false;                 // results flag   dword junk     = 0;                     // discard results    hdevice = createfilew(wszpath,          // drive open                         0,                // no access drive                         file_share_read | // share mode                         file_share_write,                          null,             // default security attributes                         open_existing,    // disposition                         0,                // file attributes                         null);            // not copy file attributes    if (hdevice == invalid_handle_value)    // cannot open drive   {     return (false);   }    bresult = deviceiocontrol(hdevice,                       // device queried                             ioctl_disk_get_drive_geometry, // operation perform                             null, 0,                       // no input buffer                             pdg, sizeof(*pdg),            // output buffer                             &junk,                         // # bytes returned                             (lpoverlapped) null);          // synchronous i/o    closehandle(hdevice);    return (bresult); }  int wmain(int argc, wchar_t *argv[]) {   disk_geometry pdg = { 0 }; // disk drive geometry structure   bool bresult = false;      // generic results flag   ulonglong disksize = 0;    // size of drive, in bytes    bresult = getdrivegeometry (wszdrive, &pdg);    if (bresult)    {     wprintf(l"drive path      = %ws\n",   wszdrive);     wprintf(l"cylinders       = %i64d\n", pdg.cylinders);     wprintf(l"tracks/cylinder = %ld\n",   (ulong) pdg.trackspercylinder);     wprintf(l"sectors/track   = %ld\n",   (ulong) pdg.sectorspertrack);     wprintf(l"bytes/sector    = %ld\n",   (ulong) pdg.bytespersector);      disksize = pdg.cylinders.quadpart * (ulong)pdg.trackspercylinder *                (ulong)pdg.sectorspertrack * (ulong)pdg.bytespersector;     wprintf(l"disk size       = %i64d (bytes)\n"             l"                = %.2f (gb)\n",              disksize, (double) disksize / (1024 * 1024 * 1024));   }    else    {     wprintf (l"getdrivegeometry failed. error %ld.\n", getlasterror ());   }    return ((int)bresult); }

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