CN101729753B - Method and device for loading pictures during java application - Google Patents
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- CN101729753B CN101729753B CN2009101101032A CN200910110103A CN101729753B CN 101729753 B CN101729753 B CN 101729753B CN 2009101101032 A CN2009101101032 A CN 2009101101032A CN 200910110103 A CN200910110103 A CN 200910110103A CN 101729753 B CN101729753 B CN 101729753B
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Abstract
The invention provides a method for loading pictures during java application. The method comprises the following steps that: a java layer acquires an absolute path storing a jar application packet; the java layer transmits the acquired absolute path storing the jar application packet and a pre-written-in relative path for the pictures needing loading in the jar application packet into a C-language bottom layer; after acquiring the absolute path storing the jar application packet, the C-language bottom layer decompresses and unpacks the jar application packet, finds corresponding pictures according to the relative path for the pictures needing loading in the jar application packet and reads out binary data of the pictures in a cache; and the C-language bottom layer calls an graphics engine, constructs the pictures according to the binary data of the pictures and decodes the pictures for displaying. Correspondingly, the invention also provides a device for loading the pictures during the java application so as to realize efficient picture loading and improve the efficiency while lightening the workload of personnel developing set-top box application.
Description
Technical field
The present invention relates to field of set-top, relate in particular to the method and apparatus that Loads Image in a kind of java application.
Background technology
Come into vogue on the set-top box at present and adopted embedded java virtual machine, java is a kind of programming language, by the issue of sun company, by java language development set-top box software, especially set-top box middleware, the java programming has its special advantages, as: platform-neutral, fail safe, the bag that rich functions is perfect, autgmentability is strong or the like, but adopts java that some inferior positions, particularly performance issue are also arranged on embedded.Compared with traditional set-top box software that utilizes the C language development, it is slow that the effect that java moves on set-top box is wanted, here give an example, resource Loads Image, traditional C language development, picture resource can be stored as binary format, and the C language directly reads, and carries out just can showing after the necessary decoding.
And adopt java to Load Image now, generally in the following way: when the awt bag Loads Image among the java, Load Image by Toolkit.getDefaultToolkit () .getImage (" image/background.jpg ") form, its inner principle that realizes is: search picture under the image path of the classpath that disposes when current java program running, if find, then read it.
But the function that this mode is supported is limited, after the java application program exports to the jar file distribution, be saved in local set-top box by network download, again by the application manager of set-top box during by self-defining Classloader classloader load operating, picture can't normal load show, reason is to search under this mode class.path classpath catalogue that can only dispose when starting virtual machine, do not support in the path at the jar of current operation application bag place, searching of intelligence, described jar is a kind of compressed file bag, want the quoting general class when normally developing, break into the jar bag and be convenient to storage and managenent.
In order to address these problems, existing way is heavily loaded getImage method, the absolute path of the jar application of current operation being wrapped the place is imported the getImage method into, utilize function that the zip bag of java provides to use the bag then and read image data from the jar of correspondence, and then pass to by the native method and to remove to construct picture in the C language bottom layer, show at last.
The inventor in implementation process, find above-mentioned existing solution have two aspect shortcoming, at first existing solution reads the java layer to image data by the java method, by native data passes is arrived the C layer again then, not only lose time, and the waste internal memory; Secondly existing solution not have to solve and how to get access to current jar application and wrap in absolute path in the set-top box, still do not support to load a picture from the jar application bag that network is downloaded, support to load the picture in the jar application bag if desired, then need the developer of java and developer's as offered of set-top box application management device, very inconvenient.
Summary of the invention
In view of above-mentioned existing in prior technology problem, the embodiment of the invention provides the method and apparatus that Loads Image in a kind of java application, by obtaining the absolute path that storage jar uses bag, directly at C language bottom layer decompress(ion) and find and need the picture that loads, when having alleviated set-top box developer work, realized efficiently Loading Image, improved efficient.
In order to solve the problem that prior art exists, the embodiment of the invention provides the method that Loads Image in a kind of java application, is used for the set-top box middleware, comprising:
The Java layer obtains the absolute path that storage jar uses bag;
The relative path of the picture that the needs that the absolute path of the described storage jar application bag that the Java layer will get access to and jar write in using and wrapping in advance load passes in the C language bottom layer;
After the C language bottom layer got access to the absolute path of storing described jar application bag, decompress(ion) was opened described jar and is used bag, and the relative path of the picture that the needs in wrapping according to described jar application load finds corresponding picture, and the binary data of reading described picture is in buffer memory;
The C language bottom layer is called graphics engine, constructs picture and decoding and displaying according to the binary data of described picture.
Accordingly, the embodiment of the invention also provides a kind of ad system, is used for the set-top box middleware, comprises acquiring unit, the path transfer unit, and picture searching reading unit and decoding display unit, wherein:
Described acquiring unit is used to obtain the absolute path that storage jar uses bag;
Described path transfer unit links to each other with described picture searching reading unit, and the relative path that the described jar of storage that is used for that described acquisition module is got access to uses the picture of the absolute path of bag and the needs loading that jar application bag writes in advance passes in the described picture searching reading unit;
Described picture searching reading unit, be used for using the absolute path of bag according to the described jar of the storage that gets access to, decompress(ion) is opened described jar and is used bag, and the relative path of using the picture of the needs loading in the bag according to described jar finds corresponding picture, and the binary data of reading described picture is in buffer memory;
The decoding and displaying unit is used to call graphics engine, and the binary data that is stored in the picture in the buffer memory of described picture searching reading unit is constructed picture and decoding and displaying.
Implement the embodiment of the invention, obtain the absolute path that storage jar uses bag by the java layer; The relative path that the absolute path of the described jar application of the storage that the java layer will get access to bag and jar use the picture of the needs loading that writes in advance in the bag passes in the C language bottom layer; After the C language bottom layer got access to the absolute path of storing described jar application bag, decompress(ion) was opened described jar and is used bag, and the relative path of the picture that the needs in wrapping according to described jar application load finds corresponding picture, and the binary data of reading described picture is in buffer memory; The C language bottom layer is called graphics engine, constructs picture and decoding and displaying according to the binary data of described picture, when having alleviated exploitation set-top box application personnel work, has realized efficiently Loading Image, and has improved efficient.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is a flow process schematic diagram of the method that Loads Image during embodiment of the invention java uses;
Fig. 2 is another schematic flow sheet of the method that Loads Image during embodiment of the invention java uses;
Fig. 3 is the structural representation of the device that Loads Image during embodiment of the invention java uses;
Fig. 4 is the structural representation of acquiring unit in Fig. 3 device;
Fig. 5 is the structural representation of first acquiring unit among Fig. 4;
Fig. 6 is the structural representation of path transfer unit among Fig. 3.
Embodiment
The embodiment of the invention provides the method and apparatus that Loads Image in a kind of java application, by obtaining the absolute path that storage jar uses bag, directly at C language bottom layer decompress(ion) and find and need the picture that loads, when having alleviated exploitation set-top box application personnel work, realized efficiently Loading Image, improved efficient.
Adopt embedded java virtual machine in the set-top box, by java language development set-top box software, especially during the set-top box middleware, at first at the embedded java virtual machine of local set-top box, on virtual machine, dispose what a java application manager, after application manager is used the application of packet form from jar of network download, for example: music.jar (music software), be kept in the set-top box memory device, suppose that the path is :/flash/music.jar.
When needs start this application (i.e. this music software), application platform need be carried out following steps: at first create a URL Classloader (URLClassLoader) and load this and use, import the path/flash/music.jar at this application place into URLCloassLoader; Find the inlet class among the music.jar by application manager then and start this music and use.
The developer is when this application of exploitation music.jar, show a pictures on the interface if desired, still write code according to most common form, as Toolkit.getDefaultToolkit () .getImage (" image/background.jpg "), this shows to use at current jar searches this picture of image/background.jpg and loading in the bag; The embodiment of the invention is mainly revised the getImage method by the embedded virtual machine of transformation apparatus top box, makes its jar that can automatically identify current operation use bag load operating under which path.Described getImage method refers to the method that Loads Image be the method for Toolkit class, is used to Load Image; Described Toolkit is the java class of standard.
Describe the preferred embodiments of the present invention in detail below in conjunction with accompanying drawing.
Referring to Fig. 1, a flow process schematic diagram of the method that Loads Image in using for embodiment of the invention java comprises:
Step 101:Java layer obtains the absolute path that storage jar uses bag;
Concrete, comprised also that before step 101 downloading described jar application from network terminal wraps and be kept at the set-top box memory device, it is the newly-built java engineerings of open personnel that the jar of described network terminal uses bag, Load Image by relative path in the java path, the jar that derives and leave in network server end uses bag.Suppose that the developer is when this application of exploitation music.jar, need to show a pictures on the interface, then the developer can write code according to the most frequently used method, as: Toolkit.getDefaultToolkit () .getImage (" image/background.jpg "), this shows to use at current jar searches this picture of image/background.jpg and loading in the bag, this is used packing be placed on network server end, download for the set-top box application management person.
The Java layer obtains the absolute path that storage jar uses bag and specifically comprises the steps: in the step 101
A: obtain the class of calling the getImage method, described getImage method refers to the method for Loading Image, getImage is the method in the Toolkit class, be used to Load Image, described Toolkit is the java class of standard, this step is by newly-increased native method in the getImage method, is used for obtaining the class of calling getImage specially, and described native method is the method that a kind of java and C language call mutually.
B:, obtain and load the Classloader classloader that jar uses bag according to the class of the described getImage method that gets access to; The class of the described getImage method that gets access to is exactly certain class among the music.jar, obtains the classloader that loads music.jar by the method for getclassloader.
C: obtain the absolute path that the described jar of storage uses bag by described Classloader, connect above-mentioned example, just for obtain the absolute path that the described music.jar of storage uses bag by described Classloader classloader, suppose this absolute path for (/flash/music.jar).
The relative path that the absolute path of the described jar application of the storage that step 102:java layer will get access to bag and jar use the picture of the needs loading that writes in advance in the bag passes in the C language bottom layer;
Described will store described jar use bag absolute path (/flash/music.jar) and the jar relative path (image/background.jpg) of using the picture that the needs that write in advance in the bag load pass in the C language bottom layer, by the native method above-mentioned two paths are passed in the C language bottom layer.It should be noted that the native method shown in the A step in described native method of this step and the step 101 is a diverse ways, both purposes are different, but be the method that a kind of java language and C language call mutually from the broad sense function, therefore in the java language, be referred to as the native method.
Step 103:C language bottom layer get access to the described jar of storage use bag absolute path (/flash/music.jar) after, call zip algorithm decompress(ion) and open described jar application bag, the relative path (image/background.jpg) of using the picture of the needs loading in the bag according to described jar finds corresponding picture, reads in binary data to a buffer memory of described picture;
Step 104:C language bottom layer is called graphics engine, constructs picture and decoding and displaying from the binary data of described picture.In this step, construct picture and decoding according to the binary data of described picture, the picture that decoding is come out is used for showing.
Referring to Fig. 2, another schematic flow sheet of the method that Loads Image in using for embodiment of the invention java.
This schematic flow sheet is the flow process of describing in conjunction with network server end and STB terminal.
At first in network server end, the newly-built java application project of developer as xlet, Loads Image by relative path in the java application, and the jar that derives the jar form at last uses bag, leaves server end in, for downloading.
At STB terminal, set-top box java application manager is used bag by the jar that network download leaves server end in, and stores in the set-top box, loads jar by a self-defining classloader and uses bag.
After jar used the bag download and stores in the set-top box, the picture that STB terminal loads in the jar application bag comprised the steps:
Step 201: obtain the class of calling the getImage method by the native method, described native method is that the method for calling class is obtained in the realization in the getImage method;
Step 202:, obtain and load the Classloader classloader that jar uses bag according to the class of the described getImage method that gets access to;
Step 203: the classloader by described loading jar uses bag, obtain the absolute path that the described jar of storage uses bag;
The relative path of the picture that the needs that the absolute path of the described storage jar application bag that step 204:java layer will get access to and jar write in using and wrapping in advance load passes in the C language bottom layer by the native method, and described native method is the method that a kind of java and C language call mutually;
After step 205:C language bottom layer gets access to the absolute path of the described jar application of storage bag, decompress(ion) is opened described jar and is used bag, the relative path of using the picture of the needs loading in the bag according to described jar finds corresponding picture, and the binary data of reading described picture is in buffer memory;
Step 206:C language bottom layer is called graphics engine, constructs picture and decoding and displaying according to the binary data of described picture.
The method that Loads Image during enforcement embodiment of the invention java uses, by obtaining the absolute path that storage jar uses bag, the described storage jar that gets access to is used the relative path that the absolute path of bag and jar use the picture that the needs that write in advance in the bag load to be passed in the C language bottom layer, in the C language bottom layer, the jar bag is carried out decompression processing, realized efficiently Loading Image, improved efficient, simultaneously, alleviated developer's work, no longer needed the jar application to unwrap the personnel of sending out and consult routing problem with the set-top box administrative staff.
Describe the flow process of the method that java Loads Image in using in the embodiment of the invention above in detail, describe the structure of the device that java Loads Image in using in the embodiment of the invention below in conjunction with Fig. 3.
Referring to Fig. 3, the structural representation of the device that Loads Image in using for embodiment of the invention java comprises: acquiring unit 1, and path transfer unit 2, picture searching reading unit 3 and decoding display unit 4, wherein:
Described acquiring unit 1 is used to obtain the absolute path that storage jar uses bag;
Concrete, referring to Fig. 4, the structural representation for described acquiring unit 1 comprises:
First acquiring unit 11 is used to obtain the class of calling the getImage method, and described getImage method refers to the method that Loads Image; Referring to Fig. 5, the structural representation for described first acquiring unit 11 comprises: a native unit 111, be used to obtain the class of calling the getImage method that Loads Image, and described native unit 111 is unit that a kind of java of realization and C language call mutually.
The 3rd acquiring unit 13, the Classloader classloader that gets access to by described second acquisition unit 12 obtains the absolute path that the described jar of storage uses bag.
Described path transfer unit 2 links to each other with described picture searching reading unit 3, and the relative path that the described jar of storage that is used for that described acquisition module 1 is got access to uses the picture of the absolute path of bag and the needs loading that jar application bag writes in advance passes in the described picture searching reading unit 3; Referring to Fig. 6, structural representation for described path transfer unit, comprise: the 2nd native unit 21, the relative path that the described jar of storage that is used for that described acquisition module 1 is got access to uses the picture of the absolute path of bag and the needs loading that jar application bag writes in advance passes in the described picture searching reading unit 3.
Described picture searching reading unit 3, be used for using the absolute path of bag according to the described jar of the storage that gets access to, decompress(ion) is opened described jar and is used bag, the relative path of using the picture of the needs loading in the bag according to described jar finds corresponding picture, and the binary data of reading described picture is in buffer memory;
Decoding and displaying unit 4 is used to call graphics engine, and the binary data that is stored in the picture in the buffer memory of described picture searching reading unit is constructed picture and decoding and displaying.
The device that described java Loads Image in using also comprises:
In the prior art, download a java from network and use (being packaged into the jar form) to local set-top box, do not wrap in absolute path in the set-top box because how prior art have to solve obtaining current jar application, application manager loads this application by self-defining classloader, finish writing the path of current application in needing to use earlier, this need develop the developer of java application and developer's as offered path of set-top box application management device, very inconvenient, and adopt existing java method from the jar application bag of set-top box memory device (as FLASH), to read image data to the java layer, and then transfer back to the mode that the C layer carries out decoding and displaying and load, image displaying speed is very slow, waste the time, reduced efficient.Embodiment of the invention difference with the prior art is, pass through the embedded virtual machine of transformation apparatus top box in the embodiment of the invention, main by revising the getImage method, the mode of newly-increased native method in the getImage method, can get access to current jar and use the absolute path that wraps in the set-top box, alleviated the developer's of developing engine top box java application work, its exploitation java uses still according to former custom, need not consider that this uses finally can to leave in and where use, Load Image with the same in local PC operational effect, and significantly reduced the jar application and wrapped the data copy of using in the process that Loads Image, accelerated to load on the set-top box display speed that jar uses the picture in the bag, particularly when jar used bag employing compressed format, the method was owing at C language bottom layer decompress(ion), more can embody efficiency.
The embodiment of the invention is obtained the absolute path that storage jar uses bag by the java layer, and the described jar of the storage that will get access to uses the relative path that the absolute path of bag and jar use the picture that the needs that write in advance in the bag load and passes in the C language bottom layer; After the C language bottom layer gets access to the absolute path of the described jar application of storage bag, decompress(ion) is opened described jar and is used bag, the relative path of using the picture of the needs loading in the bag according to described jar finds corresponding picture, the binary data of reading described picture is in buffer memory, and call graphics engine, construct picture and decoding and displaying according to the binary data of described picture, when having alleviated exploitation set-top box application personnel work, realized efficiently Loading Image, improved efficient.
Above disclosed is a kind of preferred embodiment of the present invention only, can not limit the present invention's interest field certainly with this, and therefore the equivalent variations of doing according to claim of the present invention still belongs to the scope that the present invention is contained.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential hardware platform, can certainly all implement by hardware.Based on such understanding, all or part of can the embodying that technical scheme of the present invention contributes to background technology with the form of software product, this computer software product can be stored in the storage medium, as ROM/RAM, magnetic disc, CD etc., comprise that some instructions are with so that a computer equipment (can be a personal computer, server, the perhaps network equipment etc.) carry out the described method of some part of each embodiment of the present invention or embodiment.
Claims (10)
1. the method that Loads Image in using of a java is used for the set-top box middleware, it is characterized in that, comprising:
The Java layer obtains the absolute path that storage jar uses bag;
The relative path of the picture that the needs that the absolute path of the described storage jar application bag that the Java layer will get access to and jar write in using and wrapping in advance load passes in the C language bottom layer;
After the C language bottom layer got access to the absolute path of storing described jar application bag, decompress(ion) was opened described jar and is used bag, and the relative path of the picture that the needs in wrapping according to described jar application load finds corresponding picture, and the binary data of reading described picture is in buffer memory;
The C language bottom layer is called graphics engine, constructs picture and decoding and displaying according to the binary data of described picture.
2. the method for claim 1 is characterized in that, the absolute path step that described java layer obtains storage jar application bag specifically comprises:
Obtain the class of calling the getImage method;
According to the class of the described getImage method that gets access to, obtain and load the Classloader that jar uses bag;
Obtain the absolute path that the described jar of storage uses bag by described Classloader.
3. method as claimed in claim 2 is characterized in that, the described class of calling the getImage method of obtaining comprises:
Obtain the class of calling the getImage method by the native method, described native method is that the method for calling class is obtained in the realization in the getImage method.
4. method as claimed in claim 2 is characterized in that, described Java layer is used relative path that the absolute path of bag and jar use the picture that the needs that write in advance in the bag load with described storage jar and passed to the C language bottom layer and comprise:
By the native method described storage jar is used the relative path that the absolute path of bag and jar use the picture that the needs that write in advance in the bag load and pass in the C language bottom layer, described native method is the method that a kind of java and C language call mutually.
5. as claim 3 or 4 described methods, it is characterized in that, described obtain the class step of calling the getImage method before, also comprise:
Downloading described jar application from network terminal wraps and is kept at the set-top box device.
6. the device that Loads Image in using of a java is used for the set-top box middleware, it is characterized in that, comprises acquiring unit, the path transfer unit, and picture searching reading unit and decoding display unit, wherein:
Described acquiring unit is used to obtain the absolute path that storage jar uses bag;
Described path transfer unit links to each other with described picture searching reading unit, and the relative path that the described jar of storage that is used for that described acquiring unit is got access to uses the picture of the absolute path of bag and the needs loading that jar application bag writes in advance passes in the described picture searching reading unit;
Described picture searching reading unit, be used for using the absolute path of bag according to the described jar of the storage that gets access to, decompress(ion) is opened described jar and is used bag, and the relative path of using the picture of the needs loading in the bag according to described jar finds corresponding picture, and the binary data of reading described picture is in buffer memory;
The decoding and displaying unit is used to call graphics engine, and the binary data that is stored in the picture in the buffer memory of described picture searching reading unit is constructed picture and decoding and displaying.
7. device as claimed in claim 6 is characterized in that, described acquiring unit comprises:
First acquiring unit is used to obtain the class of calling the getImage method;
Second acquisition unit, the class of the getImage method that gets access to according to described first acquiring unit is obtained and is loaded the Classloader that jar uses bag;
The 3rd acquiring unit, the Classloader that gets access to by described second acquisition unit obtains the absolute path that the described jar of storage uses bag.
8. device as claimed in claim 7 is characterized in that, described first acquiring unit comprises:
The one native unit is used to obtain the class of calling the getImage method.
9. device as claimed in claim 7 is characterized in that, described path transfer unit comprises:
The 2nd native unit, the described jar of the storage that described acquiring unit is got access to uses the relative path that the absolute path of bag and jar use the picture that the needs that write in advance in the bag load and passes in the described picture searching reading unit, and described the 2nd native unit is the unit that a kind of java of realization and C language call mutually.
10. install as claimed in claim 8 or 9, it is characterized in that described device also comprises:
Memory cell is used to store the jar that downloads from network terminal and uses bag.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101101032A CN101729753B (en) | 2009-11-06 | 2009-11-06 | Method and device for loading pictures during java application |
| HK10111472.2A HK1144869A1 (en) | 2009-11-06 | 2010-12-09 | Method and device for loading pictures during java application |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101101032A CN101729753B (en) | 2009-11-06 | 2009-11-06 | Method and device for loading pictures during java application |
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| CN101729753A CN101729753A (en) | 2010-06-09 |
| CN101729753B true CN101729753B (en) | 2011-09-28 |
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| CN2009101101032A Expired - Fee Related CN101729753B (en) | 2009-11-06 | 2009-11-06 | Method and device for loading pictures during java application |
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| HK (1) | HK1144869A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105681813A (en) * | 2014-11-19 | 2016-06-15 | Tcl集团股份有限公司 | Image processing method and system based on Android system |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101930376A (en) * | 2010-08-25 | 2010-12-29 | 中兴通讯股份有限公司 | Method for loading picture resources for JAVA virtual machine and terminal thereof |
| CN103136208B (en) * | 2011-11-23 | 2016-03-30 | 腾讯科技（深圳）有限公司 | A kind of method of Showing Picture and device |
| CN102541605B (en) * | 2011-12-30 | 2014-10-29 | Tcl集团股份有限公司 | Method and device for picture loading based on Android system |
| CN103929536A (en) * | 2014-03-31 | 2014-07-16 | 广东明创软件科技有限公司 | Method for improving picture processing echo speed and mobile terminal thereof |
| CN106980579B (en) * | 2016-09-30 | 2020-08-14 | 阿里巴巴集团控股有限公司 | Picture loading method and device |
| CN107786630B (en) * | 2017-09-06 | 2020-08-28 | 阿里巴巴集团控股有限公司 | Web application package processing method, device and equipment |
| CN110175053B (en) * | 2019-04-24 | 2023-10-27 | 创新先进技术有限公司 | Picture loading method and device |
| CN110825429A (en) * | 2019-11-13 | 2020-02-21 | 中孚安全技术有限公司 | Web project packaging method and system |
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| CN1519709A (en) * | 2003-02-07 | 2004-08-11 | 三星电子株式会社 | System and method for shortening quasi loading processing in JAVA program |
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| HK1144869A1 (en) | 2011-03-11 |
| CN101729753A (en) | 2010-06-09 |
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