Symbian OS advanced development-ECOM
In C ++, abstract classes and virtual functions mean that the program can call or invoke classes without knowing the specific implementation. This mechanism allows implementation after the interface is defined. This implementation is called a plug-in. In Symbian OS, ECOM is a general plug-in framework. It provides a simple mechanism for registration and query interface i
Symbian ECOM plug-in instance details 1. What is ECOMECOM is a Client/Server framework that provides services for plug-in instantiation, parsing, and analysis. Essentially, it puts the functional requirements of many applications into a DLL and allows the client to access it through interfaces.ECOM plug-in was introduced in s60 2nd. It was introduced in Symbian OS v7.0s and later versions and changed in the third edition.Plug-ins are applications writ
Symbian also has windows-likeCom mechanism, used as the interface standard between binary modules.ECOM is much simpler than Windows COM, with no guidNo iunknown, no marshal, no other things...
So, what else is there? One by one
First, like Com, your DLL needs to be registered so that someone else can find you. The difference is that, instead of registering to the registry, the DLL does not lead to injection.The function of the book anti-registration (not similarDllregisterserver and dllunreg
Symbian also has a Windows Com-like mechanism that is used as a binary interface standard between modules.
Ecom is much simpler than Windows COM, with no GUIDs, no IUnknown, no marshal, no many other things ...
So, what's left? One by one.
First and COM as your DLL to register, so that others can find you, the difference is not registered to the registry, DLL also does not elicit registration of the registration of the function (no similar dllregis
summaryECOMWe will examine this system from the perspective of interface clients, interface implementations, and interface definitions.
Interface client:
UseECOMThe implemented plug-in framework client uses the C ++ interface provided by the framework and does not require any additional steps. The entire client needs to do the following:1. ConnectECOMFramework library,ECOM. Lib2. Include interface definition file (. h header file)3. Obtain an object
1. Example source code2. Example Results3. Description[Att*=val], if the element is represented by an att with a character specified with Val, the element uses this styleCSS3 [Att*=val] Selector
[Att $ = val] selector and css3attval selector of CSS3
1. instance source code
2. instance results
3. Description
[Att $ = val]. If the end character of the attribute value represented by att is the character specified by val, this style is used for this element.
Assembly languages depend on the architecture. In Linux, the compiled assembly by GCC is an ATT syntax assembly by default. This article mainly introduces ATT Assembly: operand length, immediate number representation method, register reference, operand sequence, symbol constant, memory Reference.
1. The length of the operand
The length of the operand is expressed by the symbol after the instruction in B
immediate suffix are labeled "H" and "B" respectively, while at/T, hexadecimal immediately preceded by "0x", table 2.2 gives several corresponding examples.Table 2.2 The difference between Intel and the-t prefix
Intel syntax
AT/t syntax
MOV eax,8
MOVL $8,%eax
MOV EBX,0FFFFH
MOVL $0XFFFF,%EBX
int 80h
int $0x80
2. Direction of the operandIntel is in the opposite direction of the/t operand. In Intel syntax, t
A new att assembly problem (coming soon)-General Linux technology-Linux programming and kernel information. For more information, see the following. This is what I wrote. I want to use the bubble algorithm to arrange a group of data and then output the data. but I always feel a bit problematic. I hope the experts can help me ......
. Section. data
Output:
. Asciz "ni yao de shu shi % d \ n"
Msg:
. Long 55555555,33333, 53,56, 25, 52, 56,631,56
1 each element has one or more attributes that are used to give additional information about the element or its contents, such as: In an IMG element, SRC is the attribute of the element, and the address that marks the image2 main DOM methods for operating characteristicsGetAttribute methodSetAttribute methodRemoveAttribute method3 jquery uses the attr () method to get and set element properties, attr is an abbreviation for attribute (attribute)4 Expression of attr ()attr (incoming property name)
ATT, attribute Protocol, protocol for discovering, reading, and writing to-end devices (for BLE devices) 1 Introduction
ATT allows a device to provide a set of attributes with associated values as a serverLet the device as a client to discover, read, write these attributes, and the server can actively notify the client
The ATT defines two roles: server and Client
[Att * = val] selector and css3attval selector of CSS3
1. instance source code
2. instance results
3. Description
[Att * = val]. If the attribute value represented by att contains characters specified by val, this style is used for this element.
[Att ^ = val] selector and css3attval selector of CSS3
1. instance source code
2. instance results
3. Description
[Att ^ = val]. If the attribute value represented by att starts with a character specified by val, this style is used for this element.
1. Example source code2. Example Results3. Description[Att$=val], if the element is represented by an ATT, the end character of the property value of the property is specified with a val character, then the element uses this styleCSS3 [Att$=val] Selector
There are three ways in which jquery offers usData ()Att ()Prop ()To set and get the properties of an object. But the design of these three methods does not repeat the useless design, then the three of their distinction is where it.Demo attr () Method: is the integration of the getattribute () and setattribute () methods in JSUsage is the most routine.$ (' div '). attr ({age:30,address: "Tianjin"});var = $ (' div '). attr ("Age");$ (' div '). R
Busybox/src/include/platform.h
/* Fast_func is a qualifier which (possibly) makes function call faster
* and/or smaller by using modified ABI. It is usually only needed
* on non-static, busybox internal functions. Recent versions of GCC
*
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such as XML:
The flag of item 3 obtained after parsing is the default value of FALSE, if you want to modify to true, you need to add the
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