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Extra resources for 20687A Configuring Windows 8 Setup Guide, Trainer Preparation Guide
The CreateFile, ReadFile, and WriteFile concepts discussed in this chapter apply not only to files, but also to several other I/O channels. For example, these same functions appear in Chapters 8, 11, and 14. Chapter 7 discusses synchronization and contains several sections that discuss overlapped and extended overlapped I/O in detail. 11 discusses interprocess communication, and file mapping can be a very useful technique. Chapters 3 and 4 show you how to access disk drives and directories. These concepts are important to the discussion of files because drives and directories hold the files that you access.
8 discusses asynchronous file operations. 3 contains a program that performs a simple file read, designed for a text file or a file of bytes. 13 demonstrates a file-write operation that writes structures to a new file. c = x; success = WriteFile(fileHandle, &dataRec, sizeof(data), &numWrite, 0); } while ((x++ < 10) && success); // Close the file CloseHandle(fileHandle); } TheWriteFile function is similar to theReadFile function, writing the specified number of bytes to disk. The function does not care what the bytes represent, so you can use it to write text or structures.
Several of these functions require an open file handle rather than the file's name. 7 for details on the CreateFile function. 1 Getting the File Times The GetFileTime function retrieves three different pieces of time information from an open file: the Creation time, the Last Access time, and the Last Write time. The FAT file system supports only the last write time, but NTFS and HPFS support all three. GetFileTime uses the handle that it returns to access the file times, and then passes the last write time up to the ShowTime function to dump the time to stdout.