Open Device(Hard Drive, CD/DVD) or a device from its mount point

// szInput:in:

//1. Device no, st, 0,1,...,n

//2. Device char, st, C:, D:, ....

//3. Device mount path, st, C:/CD-ROM

//szDevName:out

//cchDevName:out

bool GetDeviceName(WCHAR *szDevName, size_t cchDevName, const WCHAR *szInput) { unsigned int disk_no = 0; if (AtoI<unsigned int>(szInput, &disk_no)) { // It's a physical disk StringCchPrintfW(szDevName, cchDevName, L"////.//PHYSICALDRIVE%d", disk_no); return true; } WCHAR drive_letter = toupper(szInput[0]); if (drive_letter >= 'A' && drive_letter <= 'Z' && szInput[1] == ':' && szInput[2] == '/0') { // It's a drive letter StringCchPrintfW(szDevName, cchDevName, L"////.//%c:", drive_letter); return true; } WCHAR sz[_MAX_PATH]; const WCHAR *p = wcsrchr(szInput, '//'); if (!p || p[1] != '/0') { // Mount point needs to end in backslash StringCchCopyW(sz, ARRLEN(sz), szInput); StringCchCatW(sz, ARRLEN(sz), L"//"); szInput = sz; } if (!GetVolumeNameForVolumeMountPointW( szInput, szDevName, cchDevName)) return false; // This returns a name ending with '/' // but CreateFile does not take it, so // we need to get rid of it. WCHAR *q = wcsrchr(szDevName, '//'); if (q && q[1] == '/0') *q = '/0'; return true;}