![]() Note that this is currently intended to write in the "files" directory only (e.g. I decided to write a class from this thread that may be helpful to others. Log.i("File Reading stuff", "success = " + isTheSame) Check if we read back the same chars that we had written outīoolean isTheSame = TESTSTRING.equals(readString) String readString = new String(inputBuffer) Fill the Buffer with data from the file InputStreamReader isr = new InputStreamReader(fIn) Ĭhar inputBuffer = new char * We have to use the openFileInput()-methodįileInputStream fIn = openFileInput("samplefile.txt") OutputStreamWriter osw = new OutputStreamWriter(fOut) * We have to use the openFileOutput()-methodįileOutputStream fOut = openFileOutput("samplefile.txt", Ntstatus = ZwReadFile(handle, NULL, NULL, NULL, &ioStatusBlock,įor more information about how to use files in a driver, see the "Using Files In A Driver" section in the Windows Driver Development Kit.Final String TESTSTRING = new String("Hello Android") LARGE_INTEGER byteOffset īyteOffset.LowPart = byteOffset.HighPart = 0 The following code example illustrates how to read from a file. Ntstatus = ZwWriteFile(handle, NULL, NULL, NULL, &ioStatusBlock, Ntstatus = RtlStringCbLengthA(buffer, sizeof(buffer), &cb) Ntstatus = RtlStringCbPrintfA(buffer, sizeof(buffer), "This is %d test\r\n", 0x0) The following code example illustrates how to write to a file. When you have finished modifying the file, close the handle by using the ZwClose function. You can now call the ZwReadFile function or the ZwWriteFile function. Instead, you may use a work item or a system worker thread to perform file operations. Do not try to perform any file operations at higher IRQL levels. The following code example illustrates how to obtain a file handle. Additionally, you can access the file at a random location. Therefore, you can sequentially read or write to the file later. If you set the CreateOptions parameter to FILE_SYNCHRONOUS_IO_NONALERT or FILE_SYNCHRONOUS_IO_ALERT, the file system keeps track of the current file-position offset. Readers who are familiar with make, but not with the 2.6 kernel build system, are likely to be wondering how this makefile works. The DesiredAccess parameter can be set to either GENERIC_READ, GENERIC_WRITE, or GENERIC_ALL, depending on what you want to do. To obtain a file handle, you can pass an OBJECT_ATTRIBUTES structure to the ZwCreateFile function. OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE, InitializeObjectAttributes(&objAttr, &uniName, RtlInitUnicodeString(&uniName, L"\\DosDevices\\C:\\WINDOWS\\example.txt") // or L"\\SystemRoot\\example.txt" The following code example illustrates how to refer to a file by its object name. For example, this folder may be C:\Windows or D:\Winnt. The \SystemRoot namespace is mapped to the folder where the operation system is installed. The only part of the file system that is guaranteed to be available is the \SystemRoot namespace. Therefore, the \DosDevices namespace is inaccessible to the device driver because no drive letter is exposed. Note If the device driver is loaded early, the \DosDevices namespace may not yet exist. Then the object name is encapsulated into an OBJECT_ATTRIBUTES structure by calling the InitializeObjectAttributes function. For example, the object name of the C:\Windows\Example.txt file is \DosDevices\C:\Windows\Example.txt. This name is \DosDevices together with the full path of the file. Kernel-mode device drivers refer to a file by its object name. More Information Refer to a file by its object name This article describes how to open a disk file from a kernel-mode device driver and how to read from or write to the file.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |