int filemap(const TCHAR *name, void (*processor)(const void *, size_t, const TCHAR *, void *arg), void *arg) { HANDLE f; HANDLE m; DWORD size; DWORD sizeHi; void *p; f = CreateFile(name, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_FLAG_SEQUENTIAL_SCAN, NULL); if (f == INVALID_HANDLE_VALUE) { win32perror(name); return 0; } size = GetFileSize(f, &sizeHi); if (size == (DWORD)-1) { win32perror(name); return 0; } if (sizeHi) { _ftprintf(stderr, _T("%s: bigger than 2Gb\n"), name); return 0; } /* CreateFileMapping barfs on zero length files */ if (size == 0) { static const char c = '\0'; processor(&c, 0, name, arg); CloseHandle(f); return 1; } m = CreateFileMapping(f, NULL, PAGE_READONLY, 0, 0, NULL); if (m == NULL) { win32perror(name); CloseHandle(f); return 0; } p = MapViewOfFile(m, FILE_MAP_READ, 0, 0, 0); if (p == NULL) { win32perror(name); CloseHandle(m); CloseHandle(f); return 0; } processor(p, size, name, arg); UnmapViewOfFile(p); CloseHandle(m); CloseHandle(f); return 1; }
LPTSTR get_str_property(HDEVINFO hDevInfo, SP_DEVINFO_DATA* DeviceInfoData, DWORD prop) { DWORD DataT; LPTSTR buffer = NULL; DWORD buffersize = 0; // // Call function with null to begin with, // then use the returned buffer size (doubled) // to Alloc the buffer. Keep calling until // success or an unknown failure. // // Double the returned buffersize to correct // for underlying legacy CM functions that // return an incorrect buffersize value on // DBCS/MBCS systems. // while (!SetupDiGetDeviceRegistryProperty(hDevInfo, DeviceInfoData, prop, &DataT, (PBYTE)buffer, buffersize, &buffersize)) { if (GetLastError() == ERROR_INSUFFICIENT_BUFFER) { // Change the buffer size. if (buffer) LocalFree(buffer); // Double the size to avoid problems on // W2k MBCS systems per KB 888609. buffer = LocalAlloc(LPTR,buffersize * 2); if (!buffer) return NULL; } else { // Insert error handling here. win32perror("SetupDiGetDeviceRegistryProperty()"); if (buffer) LocalFree(buffer); return NULL; } } return buffer; }