invalid descriptor index

File Descriptor   when an application requests to open or manipulate a file, the operating system sets a list of files for the application, which is not described in detail here the operating system will provide you with a nonnegative integer, as an

Background: USB theory Knowledge light looks at the fantasy always feel absent-minded, as if where can not understand in place, make a summary of their own. Body: 1, the most basic unit of USB communication is "package". If the "package" dismembered,

USB is a universal Bus and ports are unified. However, there are various USB devices, such as USB mouse, USB keyboard, and USB flash disks. How do USB hosts identify different devices? This depends on the descriptor. USB descriptors include device

Main content of this article:1. Basic Concepts: physical memory, virtual memory, physical address, virtual address, logical address, page directory, and page table2. Windows Memory Management3. CPU Memory Management4. CPU page-Based Memory

I. Basic knowledge of memory management1.S3C2440 uses a maximum of two page tables: the first-level page table is used when converting in segments, and the two-level page table is used when converting pages. There are three sizes of pages: Large

[-] 1. Control Register Protection Control bit Coprocessor control bit Cr2 AND Cr 3 2. system address register Global Descriptor Table register GDTR Local Descriptor Table register ldtr Interrupt Descriptor Table

  2 Index and Query Optimization Index type Ø normal index: This is the most basic index type and has no restrictions such as uniqueness. Ø unique index: It is basically the same as a normal index, but all index column values are unique. Ø primary

1, real mode, protection modeThere are two modes of CPU Startup: Real mode and protection mode Real mode: cannot use multithreading. You cannot implement a permission rating. You cannot access more than 20-bit address lines, which means you can

Website: http://blog.csdn.net/billpig/article/details/5833980The segment register in protected mode is composed of a 16-bit selector and a 64-bit segment Descriptor RegisterSegment Descriptor Register: Bucket DescriptorSelector: The index of the

1-3 1794 redirection Program In use, unable to uninstall.1795 the specified printer driver has been installed.The port specified by 1796 is unknown.1797 the printer driver is unknown.1798 the print handler is unknown.1799 the specified delimiter