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摘要：Tables are the basic objects in the database used to store data as well as data about data (metadata). In a geodatabase, there are system tables that store information about the other tables, records, and indexes in the geodatabase. These are called metadata tables or repository tables.There are als 阅读全文

摘要：Feature and Feature Classes.Feature classesare homogeneous collections of common features, each having the same spatial representation, such aspoints, lines, orpolygons, and a common set of attribute columns, for example, a line feature class for representing road centerlines. The four most commonly 阅读全文

摘要：一、关于IWorkspace 和 IWorkspaceFactoryWorkspace对象实现IWorkspace,Workspace（工作空间）是一个类(Class)，用户不能直接创建它，为了获得一个工作空间，需要使用WorkspaceFactory（工作空间工厂）对象来创建一个Workspace。WordspaceFactory是GeoDatabase的入口。它是一个抽象类，派生了许多的子类，例如AccessWorkspaceFactory,ShapefileWorkspaceFactory等，这些对象都实现了IWorkspaceFactory接口，不同类型的文件需要不同的工作空间工厂对象 阅读全文

摘要：In this topicInterface inheritanceInbound interfacesOutbound interfacesInterface membersInterfaces are the access points for development with COM objects. There are inbound interfaces, which expose the properties and methods of a class, and outbound interfaces, which allow the class to interact with 阅读全文

摘要：There are three types of classes shown in the UML diagrams: abstract classes, coclasses, and classes.Acoclassrepresents objects that you can directly create using the object declaration syntax in your development environment. In Visual Basic, this is written with theDim pFoo As New FooObjectsyntax.[ 阅读全文

摘要：ArcObjects is a set of platform-independent software components, written in C++, that provides services to support GIS applications on the desktop in the form of thick and thin clients and on the server.As stated, the language chosen to develop ArcObjects was C++; in addition to this language, ArcOb 阅读全文

摘要：What Is ArcGIS Engine?ArcGIS Engine is acollection of embeddable GIS components and developer resources that can beused to extend ArcGISor build your own applications.Developers use ArcGIS Engine to deploy GIS data, maps, and geoprocessing scripts in desktop or mobile applications using application 阅读全文

摘要：In the geodatabase, attributes are managed in tables based on a series of simple yet essential relational data concepts:Tables contain rows.All rows in a table have the same columns.Each column has a data type, such as integer, decimal number, character, and date.A series of relational functions and 阅读全文

摘要：Fundamental GIS concepts are closely linked to maps and their contents. In fact, map concepts form the basis for understanding GIS more fully. This topic explores some fundamental map concepts and describes how they are applied and used within GIS.MapsA map is a collection of map elements laid out a 阅读全文

摘要：1 use NM;2 CREATE TABLE dbo.cv(img varbinary(max)) ;3 4 INSERT INTO dbo.cv(img) 5 SELECT * FROM 6 OPENROWSET(BULK N'E:\iWorkspace\Images\test.gif', SINGLE_BLOB) AS Photo7 8 select * from dbo.cv;说明：获取BLOB字段后必须用字段别名命名，如 As Photo，否则会有以下错误：必须在 FROM 子句中为大容量行集指定相关名称。 阅读全文

摘要：本文整理自博客：http://gamebabyrocksun.blog.163.com/blog/static/571534632008101083957499/一，打开数据库连接1，要完成一个数据库访问任务，第一步则是打开连接，在OLEDB2.0以前的版本中，可以如下操作：#define COM_NO_WINDOWS_H //如果已经包含了Windows.h或不使用其他Windows 库函数时#define DBINITCONSTANTS#define INITGUID#define OLEDBVER 0x0250#include <oledb.h>#include <ol 阅读全文

摘要：去年CanSecWest的Pwn2Own黑客挑战赛，Chrome是唯一没有被攻破的浏览器，然而今年它是第一个被攻陷的浏览器。法国黑客团队Vupen利用Chrome的2个安全漏洞（需FQ），在比赛刚开始五分钟内就成功击败了Chrome的双重安全保护机制，该团队至少赢得了6万美元的奖金，其中一部分将由Google支付。由此可见，Chrome备受称赞的沙盒也不是完全不可攻破的。Vupen在四大浏览器（IE、Chrome、Safari和Firefox ）上都发现了0day漏洞，但有意先拿Chrome开刀。VUPEN利用了两个0day漏洞完全控制了64位Windows 7 SP1系统。原文链接：slas 阅读全文

摘要：首先通过GetFileSize()得到被处理文件长度（64位）的高32位和低32位值。然后在映射过程中设定每次映射的块大小为1000倍的分配粒度(系统的数据分块大小)，如果文件长度小于1000倍的分配粒度时则将块大小设置为文件的实际长度。在处理过程中由映射、访问、撤消映射构成了一个循环处理。其中，每处理完一个文件块后都通过关闭文件映射对象来对每个文件块进行整理。CreateFileMapping(... 阅读全文

摘要：前言： 在16位环境下，int/unsigned int 占16位，long/unsigned long占32位 在32位环境下，int占32位，unsigned int占16位，long/unsigned long占32位何时需要使用： long 和 int 范围是[-2^31,2^31)，即-2147483648~2147483647，而unsigned范围是[0,2^32)，即0~4294967295，所以常规的32位整数只能够处理40亿左右，当遇到比40亿大的多的数就要用到64位。64位使用范围： 不 同的编译器对64位整数的扩展有所不同，VC使用__int64/unsigne... 阅读全文