CN101272481A - Video monitoring front end equipment access method - Google Patents
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- CN101272481A CN101272481A CNA2008100472030A CN200810047203A CN101272481A CN 101272481 A CN101272481 A CN 101272481A CN A2008100472030 A CNA2008100472030 A CN A2008100472030A CN 200810047203 A CN200810047203 A CN 200810047203A CN 101272481 A CN101272481 A CN 101272481A
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Abstract
The invention relates to an access method for video monitoring front-end equipment, which is characterized in that the equipment access module of a monitoring system platform consists of two parts of a main module and a plug-in for the equipment. The main module provides a unified service interface for the inner part of the platform.. The SDK of various equipment in the monitoring system is integrated the plug-in for the equipment which is developed according to the appointed interface standard of the main module. The main module manages and controls the plug-in for the equipment and transmits the service requests of platform users to the corresponding plug-in for the equipment. And the treatment and the response of the service requests is finished by the plug-in for the equipment. In addition, the plug-in for the equipment can be dynamically loaded and unloaded to consequently finish the dynamical start and the stop control of the equipment service. The access method for the video monitoring front-end equipment has the advantage of simple and fast realization, thereby improving the scalability, the tailorability, the testability, the maintainability, the applicability and the easy use performance of the system. The technical proposal has great significance in integrating large amounts of heterogeneous video monitoring resources and establishing public video monitoring platforms with large scale.
Description
Technical field
The invention belongs to field of multimedia communication, particularly a kind of video monitoring front end equipment access method.
Background technology
City multiple cascading networks video monitoring system platform is deferred to " global eyes " standard of field of telecommunications, this regulation and stipulation equipment access module is responsible for inserting the video monitoring equipment of each manufacturer, and platform inside can be come headend equipment is carried out the query facility configuration information, changes operations such as device configuration information, control appliance by the equipment access module.
At present, equipment inserts and normally adopts this mode to carry out: equipment vendors are that secondary development merchant (user of equipment just) provides a software development kit (Software Development Kit, be called for short SDK), comprised library file, header file and SDK exploitation handbook in this kit.Header file has illustrated the operation-interface of equipment support, the parameter and the definition of data necessary structure of transmission usually.The software development kit of secondary development quotient set forming apparatus calls the interface of stipulating in the header file and transmits relevant parameters, just can finish control and operation to equipment.
But, there is numerous watch-dog manufacturers in safety-security area at present, and different Equipment Control host-host protocols, the equipment control interface that is provided are provided in each equipment vendors, data content, the form of transmission have great otherness, and this just makes the equipment access module of platform partly face difficulty.Mainly there is following difficult point in equipment access module in the existing video monitoring system:
1. because the demand in market is urgent, there is a large amount of front end watch-dog production manufacturer, and lack unified equipment and insert standard, but these isomerisms must shield by the equipment access module, and provide a unified access interface for platform inside.This just requires the access standard that the equipment access module can compatible each tame manufacturer, for platform provides the unified interface of a standard for platform intrinsic call.
2. monitoring system platform may need to add the device service support to new at any time in exploitation operation process.New equipment needs seamlessly to be linked into the equipment access module, and platform comes new equipment is controlled and operated by transparent interface.The good extensibility of equipment access module has greatly determined the extensibility of day rear platform, the generality of use.
3. the equipment of the how tame manufacturer of equipment access module compatibility, can make whole modular engineering the huge redundancy of code and be difficult to safeguard.And the increasing of the access part coupling of each vendor equipment, each equipment inserts the mutual interference of part possibility phase, and this will seriously lead to errors in the later stage and be difficult to the location, and is difficult in maintenance.
4. owing to development of technology, the equipment that vendor equipment provided inserts SDK and also can constantly upgrade.If a tame equipment is upgraded, will cause whole upgradings of whole access module engineering.Workload is big, the upgrading difficulty.
5. some applications needs some specific video monitoring front end equipments, if the access module of compatible all devices is indiscriminately imitated over, and system's too fat to move redundancy that will become, operational efficiency is low, has influenced the runnability of platform.
In sum, all difficulties that the equipment access module in the video monitoring system is faced still need to be resolved hurrily, and standardization effort also can't be finished in the near future, can not solve the problem that is faced at present.
Summary of the invention
The object of the invention is to overcome the prior art problem, and a kind of cut-in method that can adapt to different vendor's different model video monitoring front end equipment is provided.
Technical scheme of the present invention is: the equipment access module of monitoring system platform is made up of primary module and equipment plug-in unit two parts, primary module provides unified service interface to platform inside, according to the equipment plug-in unit of the agreement interface specification of primary module exploitation integrated the SDK of various kinds of equipment in the supervisory control system, primary module manages and controls these equipment plug-in units, and the service request of platform user is transmitted to the corresponding apparatus plug-in unit, finish the processing and the response of service request by the equipment plug-in unit.
And described primary module provides unified service interface to comprise query interface, interface and these three interfaces of control interface is set platform inside, and the interface specification between equipment plug-in unit and primary module comprises these three aspects of equipment query, setting and control.
And embodiment may further comprise the steps,
Step 1, platform inside are to equipment access module transmitting apparatus access service request, and service request parameter adopts unified supplemental characteristic form to pass to the respective service interface that primary module provides;
Step 2 after primary module is received service request, parses device type according to the supplemental characteristic form from service request parameter, search the equipment plug-in unit that is complementary with this device type, and the equipment plug-in unit that is complementary is transmitted service request;
Step 3, the described equipment plug-in unit that is complementary parses critical parameter information according to the supplemental characteristic form from service request parameter after receiving the service request that primary module is transmitted, finish the response and the processing of service request according to critical parameter information.
And, in the step 3,, respective byte stream in the service request parameter is changed when service request is when facility information is set, the service request parameter that meets interface specification after the conversion is delivered to equipment plug-in unit inside.
And, configuration file is set, the equipment plugin information of the configuration information record equipment plug-in unit in the configuration file; Set up mapping table service equipment type to the mapping relations between the equipment plugin information.
And described equipment plug-in unit adopts the dynamic link library form to realize, described configuration file adopts the XML form, and described mapping table adopts the MAP mapping table based on binary tree; The derivative function that equipment plug-in unit dynamic link library provides makes primary module can get access to service object's pointer of this equipment plug-in unit, primary module is saved in the MAP mapping table after getting access to this pointer, when service request need be handled, carry out equipment query, setting or control service call by this pointer according to interface specification, finish service request by the equipment plug-in unit and handle.
And, when platform need add when new equipment supported, adopt C Plus Plus to develop the corresponding new plant plug-in unit and, the following step arranged specifically for the primary module dynamic load,
Step 1 is set up the dynamic link libraries engineering at the SDK of new equipment, according to the agreement interface specification of equipment plug-in unit that defines and primary module, and exploitation corresponding apparatus plug-in unit dynamic link library;
Step 2, the primary module derivative function by equipment plug-in unit dynamic link library gets access to the subclass pointer to object in the equipment plug-in unit, and forces to be converted to the base class sub-object pointer and be kept in the mapping table, as service object's pointer;
Step 3, the configuration information of interpolation new equipment plug-in unit in configuration file, the equipment plugin information that configuration information write down adds mapping table;
When step 4, primary module start,, the handle that returns is saved in the mapping table after loading successfully, service object's pointer also is kept at is used for following respond services request in the mapping table simultaneously according to the configuration information loading equipemtn plug-in unit that adds in the configuration file.
Video monitoring front end equipment access method provided by the invention can shield the isomerism of access protocol of each vendor equipment (mainly comprising digital video frequency server Digital Video Server/ digital hard disc video recorder Digital VideoRecorder product) and the otherness of interface, for the video monitoring system platform provides unified interface, but by using plug-in part technology to make system's cutting, low coupling, height can be expanded.
Specifically, the present invention has the following advantages:
(1) because equipment inserts primary module and the equipment plug-in unit is independently, therefore when platform need increase support to new equipment, only need develop an equipment plug-in unit according to interface specification, just can be so that new equipment access platform seamlessly has good autgmentability.So in addition design also is very beneficial for concurrent development, and the remote collaboration exploitation both can be accelerated development progress, also can not cause confusion.
(2) owing between primary module and the plug-in unit, be independently between the plug-in unit, therefore reduce the coupling between them to a great extent, and abstract publicly-owned control interface, avoided the redundancy of code.At system testing and maintenance phase, can accurately locate for the problem that some equipment exists, be unlikely to not know to be the problem of which equipment, improved testability, the maintainability of equipment access module.
(3) at maintenance phase, equipment vendors also can constantly provide new equipment access SDK to adapt to new demand, so the equipment access module also needs to upgrade accordingly.If certain tame equipment SDK upgrades, only need upgrading corresponding apparatus plug-in unit, and do not need to upgrade primary module and miscellaneous equipment plug-in unit.It is convenient, fast to upgrade, and makes version management be more prone to.
(4) can dispose the equipment of need supporting in the configuration file of main program according to actual needs, but dynamic-configuration makes system's cutting.Do not need to load the equipment plug-in unit that does not have configuration, improved the operational efficiency of system.
Description of drawings
Fig. 1 is an embodiment of the invention system principle schematic diagram.
Fig. 2 is an embodiment of the invention plug-in model work schematic diagram.
Fig. 3 is an embodiment of the invention plug-in model specific implementation schematic diagram.
Embodiment
The technical scheme that the present invention proposes is: the equipment access module of monitoring system platform is made up of primary module and equipment plug-in unit two parts, primary module provides unified service interface to platform inside, according to the equipment plug-in unit of the agreement interface specification of primary module exploitation integrated the SDK of various kinds of equipment in the supervisory control system, primary module manages and controls these equipment plug-in units, and service request is transmitted to the corresponding apparatus plug-in unit, finish the processing and the response of service request by the equipment plug-in unit.The integrated SDK that faces various kinds of equipment in the control system of employing equipment plug-in unit is a kind of standardization processing, also is that a kind of simplicity is handled.The equipment of for example same equipment producer inserts SDK and often has points of resemblance, and the dissimilar equipment of so same producer can a shared equipment plug-in unit, and the equipment that comprises this producer in this equipment plug-in unit inserts the SDK content.
Though consider that the access SDK otherness that distinct device manufacturer provides is very big, basic function can be summed up as three classes: to the control of equipment, such as the registration of equipment, nullify, restart, close, during the school, PTZ controls, deploys troops on garrison duty, withdraws a garrison etc.; To obtaining of facility information, such as obtaining equipment time, equipment state, daily record, network parameter, alarm parameters or the like; To the setting of facility information, such as network parameter, alarm parameters or the like are set.The present invention adopts the method for " seeking common ground while reserving difference ", sorts out for these functions, and operation can be divided three classes: the inquiry of facility information, the modification setting of facility information, the control operation of equipment.Sort out at this that docking port is provided with on basis, service request processing procedure in the time of can simplifying concrete enforcement: primary module provides unified service interface to comprise query interface, interface and these three interfaces of control interface is set platform inside; Interface specification between equipment plug-in unit and primary module comprises these three aspects of equipment query, setting and control.In fact, the equipment plug-in unit provides control operation interface, query manipulation interface, setting operation interface to primary module.
The invention provides embodiment, may further comprise the steps,
Step 1, platform inside are to equipment access module transmitting apparatus access service request, and service request parameter adopts unified supplemental characteristic form to pass to the respective service interface that primary module provides;
According to the action type of service request, the respective service interface is query interface, one of interface and these three interfaces of control interface are set.
Step 2 after primary module is received service request, parses device type according to the supplemental characteristic form from service request parameter, search the equipment plug-in unit that is complementary with this device type, and the equipment plug-in unit that is complementary is transmitted service request;
During concrete enforcement, can be according to the action type of service request, transmit to one of the control operation interface of equipment plug-in unit, query manipulation interface, setting operation interface, can regard the respective service of having called the equipment plug-in unit as in software field.For searching the equipment plug-in unit that is complementary, can adopt the judgment processing method, to tackle no match condition:, just the equipment plug-in unit is transmitted service request if judge the equipment plug-in unit that existence is complementary; If there is no, then show not support equipment type of equipment access module, request can not be handled, and primary module abandons this request, and returns " service does not exist " response and give the requestor.
Step 3, the described equipment plug-in unit that is complementary parses critical parameter information according to the supplemental characteristic form from service request parameter after receiving the service request that primary module is transmitted, finish the response and the processing of service request according to critical parameter information.
When service request was control appliance or equipment query information, the SDK of equipment plug-in unit by including connected with remote equipment, operates; And service request is when facility information is set, and respective byte stream in the service request parameter is changed, and the service request parameter that meets interface specification after the conversion is delivered to equipment plug-in unit inside.Critical parameter information can comprise equipment unique identification, control code and command word.By the equipment unique identification can know service request at equipment.During concrete enforcement, the equipment unique identification can be the concrete sign of certain equipment, such as MAC Address, can supply unique this equipment that finds.And device type id is meant the type identification of equipment, and can identify is the equipment of which producer.Control code is to be used for the concrete action type of carrying out of marking equipment, such as the control appliance operation, is registration, still nullifies.Get parms is singlely to obtain or obtain in batches.Command word then shows the device parameter type, is to obtain equipment state, still obtains the equipment time etc.In addition, the equipment access module need be subjected to the control and the management of platform management server as the module of a core in the platform, when comprising registration, cancellation, school, the service start and stop, these functions are finished by primary module, because the present invention does not relate to these prior aries, therefore do not do tired stating.
Primary module management equipment plug-in unit and invocation facility plug-in unit are served for convenience, the invention provides further technical scheme: configuration file is set, the equipment plugin information of the configuration information record equipment plug-in unit in the configuration file; Set up mapping table service equipment type to the mapping relations between the equipment plugin information.Primary module manages and calls mainly the equipment plug-in unit and realizes by configuration file and mapping table are set.During concrete enforcement, described equipment plug-in unit can adopt the dynamic link library form to realize, so that load; Described configuration file adopts the XML form, can be according to adding configuration item when the needs loading equipemtn plug-in unit; Described mapping table adopts the MAP mapping table based on binary tree, and this mapping table has advantage efficiently, is convenient to primary module and searches the equipment plug-in unit that is complementary with device type.The derivative function that equipment plug-in unit dynamic link library provides makes primary module can get access to service object's pointer of this equipment plug-in unit, primary module is saved in the MAP mapping table after getting access to this pointer, when service request need be handled, carry out equipment query, setting or control service call by this pointer according to interface specification, finish service request by the equipment plug-in unit and handle.
Device type adopts an ID to identify, and this sign is unique, and different device types adopts different ID.Each configuration item of configuration file is included the basic equipment plugin information of an equipment plug-in unit, comprises that device type ID, equipment plugin name, equipment plug-in unit deposit the path.And mapping table is outside the index with device type ID, also writing down various equipment plugin information calls for holotype, wherein equipment plugin name, the equipment plug-in unit that provides from configuration file on the one hand deposited the path, because the equipment plug-in unit is developed to the dynamic link library form, just can dynamic load equipment plug-in unit according to these two information spinner modules; The information of being obtained during on the other hand from the loading equipemtn plug-in unit is quoted information such as number as COS, service object's pointer, service handle, service.
COS shows it is which kind of device service, and such as the Haikang, will becomes, and perseverance hundred million is with continent or the like.The service number of references is because there is the device type difference, but belongs to same producer equipment, and the also similar situation of the SDK that provides.Such as Haikang equipment, just there are DVR (network hard disk video recorder) and DVS (network video server).But because the SDK interface of these two kinds of device types is as broad as long, be respectively two types of equipment development equipment plug-in units just seem repetition, redundancy, the present invention avoids this unnecessary workload with regard to the method that adopts two types of equipment shared device plug-in units.Because mapping table is that index is stored with device type ID, therefore just there are two in the table, their plugin information is consistent.In the time will stopping certain kind equipment service, uninstall plug-in unit hastily and just may cause other plug-in unit of shared this plug-in unit also unavailable, adopting reference count is exactly for sort this problem out.When the loading equipemtn plug-in unit, just write down the number of quoting that uses this plug-in unit, promptly use the device service number of this plug-in unit.Service number to this equipment plug-in unit when stopping certain kind equipment service subtracts 1, if non-vanishing, then shows to have other device service of using this equipment plug-in unit this moment, can not unload this plug-in unit.If be zero, show that no miscellaneous equipment service uses this plug-in unit, unload and just can not cause miscellaneous equipment to serve unavailable problem.
If start certain kind equipment service, primary module is according to reading corresponding equipment disposition information in the device type configure file that starts, title and path loading equipemtn plug-in unit according to equipment plug-in unit in the configuration file, loading the handle that returns after the dynamic base is kept in the mapping table as the service handle, preserving this information is to be used for unloading from now on this plug-in unit, promptly stops the service of certain equipment.Obtain service object's pointer concrete in the equipment plug-in unit by the derivative function that calls dynamic base, and in mapping table, insert new one, thereby added support this kind equipment according to the information that gets access to.When platform need stop certain kind equipment service, primary module is the query mappings table at first, stops such service, is that 0 service also will uninstall the equipment plug-in unit for number of references, i.e. dynamic link library, and from mapping table this data item of deletion.
The present invention also provides expansion scheme: when platform need add when new equipment supported, adopting C Plus Plus to develop the corresponding new plant plug-in unit also loads for primary module, the following step is specifically arranged, step, SDK at new equipment sets up the dynamic link libraries engineering, according to the agreement interface specification of equipment plug-in unit that defines and primary module, exploitation corresponding apparatus plug-in unit dynamic link library;
The interface exploitation corresponding apparatus plug-in unit dynamic base of BaseSrv class defined owing to all be defined as the pure virtual function of C++ in the BaseSrv class, therefore realizes it being to inherit from such, promptly derives subclass, is responsible for realizing these abstraction interfaces by subclass.
Step 2, the primary module derivative function by equipment plug-in unit dynamic link library gets access to the subclass pointer to object in the equipment plug-in unit, and forces to be converted to the base class sub-object pointer and be kept in the mapping table, as service object's pointer;
When new equipment access service request arrived, primary module called the relevant device plug-in unit by service object's pointer, and this is to utilize the polymorphism of C++ and inheritance to make primary module can call the implementation method of correct equipment plug-in unit.
Step 3, the configuration information of interpolation new equipment plug-in unit in configuration file, the equipment plugin information that configuration information write down adds mapping table;
When step 4, primary module start,, the handle that returns is saved in the mapping table after loading successfully, service object's pointer also is kept at is used for following respond services request in the mapping table simultaneously according to the configuration information loading equipemtn plug-in unit that adds in the configuration file.
When the service request at new equipment arrives, primary module just can be searched mapping table according to the device type ID in the request, service object's pointer according to the relevant device plug-in unit is preserved carries out service call according to interface specification, finishes equipment access service processing of request and response by the equipment plug-in unit.
Below in conjunction with accompanying drawing, the embodiment of the invention is further carefully stated, be convenient to more clearly understand technical solution of the present invention:
Referring to accompanying drawing 1, the primary module of equipment access module provides three service interfaces to platform, respectively receiving equipment control, equipment query and equipment setting.According to the mapping relations that mapping table is set up, equipment plug-in unit 1,2,3 is respectively for device type A, B, C.In case find the plugin information that is complementary, just call according to interface specification according to service object's pointer, concrete control, operation such as inquire about and be provided with and finish by the equipment plug-in unit to equipment.The equipment plug-in unit is at concrete equipment (digital devices such as digital hard disc video recorder DVR, digital video frequency server DVS, palmtop PC PDA, PC formula digital hard disc video recorder PC_DVR, perhaps other analog machine) operates, after operation is finished, operating result will be returned to primary module, primary module returns to caller again.
Referring to accompanying drawing 2, just as the relation between mainboard and mainboard accessory,, just can seamlessly be linked into platform between primary module and the equipment plug-in unit as long as defer to interface specification between them, platform just can manage and operate this kind equipment.Primary module provides the main service of equipment access module, accepts the service request and the response of platform user on the one hand; Be responsible on the one hand each equipment plug-in unit of control (comprise Haikang equipment plug-in unit, will forming apparatus plug-in unit, permanent hundred million equipment plug-in units, with continent equipment plug-in unit etc.), obtain service from each equipment plug-in unit.Device type ID, equipment plugin name, equipment plug-in unit are deposited the path.Manage by the MAP mapping table between primary module and the equipment plug-in unit, mapping table is outside the index with device type ID, also write down the plurality of devices plugin information, deposit path, COS, service object's pointer, service handle, serve information such as quoting number as equipment plugin name, equipment plug-in unit.
Referring to accompanying drawing 3, understand that in detail the core of plug-in model realizes principle, this plug-in model adopts C Plus Plus to realize.It is exactly class BaseSrv that equipment inserts the unified interface specification that defines between primary module and each the equipment plug-in unit.Such is a pure empty class, and such can only be inherited, and does not have any realization.Three Virtual Function interface: DeviceControlRequest of this class definition, GetConfigValue, SetConfigValue indicates with the virtual field, is respectively applied for control, inquiry and the setting operation of equipment.The equipment plug-in unit derives from the DerivedSrv class from BaseSrv, and such is used for realizing the abstraction interface stipulated among the BaseSrv.How the interface that primary module does not need to understand among the DerivedSrv is realized, it only understands the interface specification that defines in the BaseSrv class, and call according to this standard docking port, because these interfaces all are defined as pure empty method, therefore when calling, can search the implementation method that empty table (VTABLE) calls corresponding derived class.The equipment plug-in unit is developed to the dynamic link library form, as XXPlugin.dll form (XX represents producer's title abbreviation), and can dynamic load and unloading, conveniently deployment and maintenance.In the main program of dynamic base, defined derivative function GetInstance, the DerivedSrv pointer to object in this function Returning equipment plug-in unit.Primary module just can get access to this pointer to object by this derivative function after the loading equipemtn plug-in unit, and forces to be converted to the BaseSrv pointer and be kept in the MAP mapping table.Primary module provides unified access interface by the MonitorSrv object to external reference, can be divided into control, inquires about and be provided with three classes.When request arrives, primary module is searched the MAP mapping table according to importing the device type id that comprises in the parameter information into, just can find corresponding equipment plugin information, and can obtain service object's pointer (being the BaseSrv pointer to object at this moment) in this plug-in unit, then according to importing the control code that comprises in the parameter information into, call the corresponding standard interface function based on this plug-in object pointer, because the polymorphism of C++, call these standard methods and in fact will call the Equipment Control that realizes among the DerivedSrv, inquiry and method is set etc., thus reach dynamically control to all kinds of front end watch-dogs, the purpose of inquiry and setting operation.
Claims (7)
1. video monitoring front end equipment access method, it is characterized in that: the equipment access module of monitoring system platform is made up of primary module and equipment plug-in unit two parts, primary module provides unified service interface to platform inside, according to the equipment plug-in unit of the agreement interface specification of primary module exploitation integrated the SDK of various kinds of equipment in the supervisory control system, primary module manages and controls these equipment plug-in units, and the service request of platform user is transmitted to the corresponding apparatus plug-in unit, finish the processing and the response of service request by the equipment plug-in unit.
2. video monitoring front end equipment access method according to claim 1, it is characterized in that: described primary module provides unified service interface to comprise query interface, interface and these three interfaces of control interface is set platform inside, and the interface specification between equipment plug-in unit and primary module comprises these three aspects of equipment query, setting and control.
3. video monitoring front end equipment access method according to claim 2, it is characterized in that: embodiment may further comprise the steps,
Step 1, platform inside are to equipment access module transmitting apparatus access service request, and service request parameter adopts unified supplemental characteristic form to pass to the respective service interface that primary module provides;
Step 2 after primary module is received service request, parses device type according to the supplemental characteristic form from service request parameter, search the equipment plug-in unit that is complementary with this device type, and the equipment plug-in unit that is complementary is transmitted service request;
Step 3, the described equipment plug-in unit that is complementary parses critical parameter information according to the supplemental characteristic form from service request parameter after receiving the service request that primary module is transmitted, finish the response and the processing of service request according to critical parameter information.
4. video monitoring front end equipment access method according to claim 3, it is characterized in that: in the step 3, when service request is when facility information is set, respective byte stream in the service request parameter is changed, the service request parameter that meets interface specification after the conversion is delivered to equipment plug-in unit inside.
5. according to claim 1 or 2 or 3 or 4 described video monitoring front end equipment access methods, it is characterized in that: configuration file is set, the equipment plugin information of the configuration information record equipment plug-in unit in the configuration file; Set up mapping table service equipment type to the mapping relations between the equipment plugin information.
6. video monitoring front end equipment access method according to claim 5 is characterized in that: described equipment plug-in unit adopts the dynamic link library form to realize, described configuration file adopts the XML form, and described mapping table adopts the MAP mapping table based on binary tree; The derivative function that equipment plug-in unit dynamic link library provides makes primary module can get access to service object's pointer of this equipment plug-in unit, primary module is saved in the MAP mapping table after getting access to this pointer, when service request need be handled, carry out equipment query, setting or control service call by this pointer according to interface specification, finish service request by the equipment plug-in unit and handle.
7. video monitoring front end equipment access method according to claim 6 is characterized in that: when platform need add when new equipment supported, adopts C Plus Plus to develop the corresponding new plant plug-in unit and load, the following step specifically arranged for primary module,
Step 1 is set up the dynamic link libraries engineering at the SDK of new equipment, according to the agreement interface specification of equipment plug-in unit that defines and primary module, and exploitation corresponding apparatus plug-in unit dynamic link library;
Step 2, the primary module derivative function by equipment plug-in unit dynamic link library gets access to the subclass pointer to object in the equipment plug-in unit, and forces to be converted to the base class sub-object pointer and be kept in the mapping table, as service object's pointer;
Step 3, the configuration information of interpolation new equipment plug-in unit in configuration file, the equipment plugin information that configuration information write down adds mapping table;
When step 4, primary module start,, the handle that returns is saved in the mapping table after loading successfully, service object's pointer also is kept at is used for following respond services request in the mapping table simultaneously according to the configuration information loading equipemtn plug-in unit that adds in the configuration file.
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