CN102567268A - Detection method for USB to virtual serial port/MODEM - Google Patents
Detection method for USB to virtual serial port/MODEM Download PDFInfo
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- CN102567268A CN102567268A CN2010106215916A CN201010621591A CN102567268A CN 102567268 A CN102567268 A CN 102567268A CN 2010106215916 A CN2010106215916 A CN 2010106215916A CN 201010621591 A CN201010621591 A CN 201010621591A CN 102567268 A CN102567268 A CN 102567268A
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Abstract
The invention relates to a detection method for universal serial bus (USB) to virtual serial port/MODEM. The method comprises the following steps that: when a Windows application program starts, the Windows application program detects whether a registration table contains USB interface drive service registration paths corresponding to each USB interface of a USB device, if so, the Windows application program reads the device registration information under each USB interface drive service registration path; the generation mode of the USB interface drive service registration path is as follows: when the USB device is connected to a computer, the computer loads the USB interface drive for each USB interface of the USB device, and an operating system generates the USB interface drive service registration paths for different USB interfaces in the registration table; and the generation mode of the device registration information is as follows: the USB interface drive registers corresponding device information under its own USB interface drive service registration path; in this way, the application program can determine the corresponding relation between the virtual serial port/MODEM and the USB device.
Description
Technical field
The present invention relates to the processing data information field; Being particularly related to provides a kind of and is carrying out in the data communication process changeing virtual serial port/MODEM through USB (UniversalSerial Bus), and window application can detect the method for USB device convenient, accurately and rapidly.
Background technology
Characteristics such as that the develop rapidly of USB technology and USB have is hot-swappable, can expand; Make USB interface replace other traditional communication interfaces gradually; USB changes virtual serial port/MODEM and according to the ACM communicator class standard in the usb protocol serial ports/MODEM and USB is organically combined; Make a USB device can fictionalize one or more serial ports/MODEM on computers, window application can be operated USB device according to the method for the true serial ports/MODEM of visit.When a plurality of USB devices are connected to same computing machine simultaneously; To occur a plurality of USB on the computing machine and change virtual serial port/MODEM equipment; As shown in Figure 1, how window application confirms that the corresponding relation between each virtual serial port/MODEM and USB device is a difficult problem.
At present; Mode through traversing operation system serial ports chained list detects USB commentaries on classics virtual serial port/MODEM in the industry; The serial ports chained list that utilizes API that Windows provides or DDK function to come the traversing operation system, and examine relevant information, thus identification virtual serial port/MODEM; But this mode application programs is handled more complicated; And, when having a plurality of identical USB devices to move on computers simultaneously, cause window application (for the window application of the supporting exploitation of USB device) can't judge the corresponding relation of virtual unit and USB device especially when serial ports/MODEM easy error when the residual risk of registration table is too much.
Summary of the invention
The technical matters that the present invention solved is when a plurality of identical USB devices run on same computing machine simultaneously; Window application can't be judged the corresponding relation of virtual serial port/MODEM and USB device; Having proposed a kind of USB changes the detection method of virtual serial port/MODEM, comes the fit applications program to detect USB device easily and fast, exactly.
The detection method that a kind of USB of the present invention changes virtual serial port/MODEM:
Window application detects the corresponding USB interface of each USB interface that whether has USB device in the registration table and drives the service registry path, if exist, reads each USB interface and drives the facility registration information under the service registry path;
When USB device is connected to computing machine; Each USB interface loading USB interface driving for USB device; Operating system drives the service registry path for each USB interface generates the corresponding USB interface that has nothing in common with each other in registration table; And USB interface drives registration corresponding equipment information under USB interface driving service registry path separately, and is as shown in Figure 2;
When extracting USB device, corresponding to each USB interface driving deletion corresponding equipment log-on message of this USB device;
Preferably, if window application has the function of surveying USB plug broadcast, when USB device was connected to computing machine, operating system was sent USB to window application and is inserted broadcast;
Preferably, if window application does not have the function of surveying USB plug broadcast, after each USB interface drives the loading completion, manually boot window application, application program reads each USB interface and drives the facility registration information under registered paths;
Preferably; If window application has the function of surveying USB plug broadcast; When extracting USB device; Operating system will be sent USB to window application and extracted broadcast, and application program reads each USB interface and drives the facility registration information under the registered paths after receiving the broadcast that USB extracts;
Preferably, described USB device is single USB device or a plurality of single USB devices;
Said single USB device is the USB device (being called for short USB sets up fully) of supporting single USB interface or the USB device (being called for short the USB equipment complex) of supporting a plurality of USB interfaces;
Can find out through above operation; The window application developer need not to understand operating system nucleus knowledge; Only need just can current connection each USB device corresponding virtual serial ports/MODEM information on computers be distinguished identification through the facility registration information in the registration table of paying close attention to operating system.The window application of having broken away from prior art needs accessing operation system kernel resource could discern the constraint that USB device changes virtual serial port/MODEM; Simplified the development difficulty of window application detection USB device greatly; Solved especially at present when a plurality of identical USB devices run on same computing machine simultaneously, window application is difficult to the problem of corresponding relation between judgment device and virtual serial port/MODEM.
Description of drawings
Fig. 1 enumerates serial ports/MODEM synoptic diagram that the back produces for a plurality of USB devices of prior art;
The facility registration information that Fig. 2 drives for each USB interface after the single USB equipment complex of the present invention load driver, USB drive the corresponding relation figure of service registry path and virtual serial port/MODEM;
Fig. 3 is facility registration information synoptic diagram after a plurality of USB equipment complex of the present invention load driver;
Fig. 4 is the corresponding relation figure of virtual serial port/MODEM after the equipment complex load driver of the present invention and each USB interface;
Fig. 5 changes the detection method preferred embodiment process flow diagram of virtual serial port/MODEM for USB of the present invention;
Fig. 6 installs the corresponding relation figure of back device numbering and each virtual serial port/MODEM port numbers for two USB equipment complexes of the present invention.
Embodiment
Each USB interface of the present invention drives each USB device (concrete grammar can be that the USB interface driving is provided with a unique sequence number for each USB device that is moving) that can both support a plurality of USB devices (concrete grammar can be to create for each USB device to send the Message Processing thread) and can distinguish current operation; When a plurality of identical USB devices connect simultaneously and load driver after; Each USB interface of each USB device drives all registration facility informations under the USB interface service registry path of correspondence, and is as shown in Figure 3.When a plurality of identical USB devices connect simultaneously and load driver after, extract part USB device or whole USB devices, the USB device corresponding equipment log-on message of extracting will be deleted immediately.
Corresponding interface drive source file (.sys file) title of each USB interface in the equipment complex of the present invention has nothing in common with each other; And the content that sets corresponding to the AddService key word of each USB interface in the INF file has nothing in common with each other; After the USB equipment complex connected computing machine and load driver, the USB interface that each USB interface drives in correspondence drove registration facility information under the service registry path.After the USB equipment complex connects computing machine and load driver, extract USB device, the USB interface that each USB interface drives in correspondence drives de-registering of devices information under the service registry path.
Said USB device is meant the USB embedded equipment according to the usb protocol standard design; Said USB interface is contained in USB device, and according to the usb protocol standard, a USB device comprises one or more USB interface; Described USB sets up and just is meant the USB device of supporting a USB interface fully; Described USB equipment complex is meant the USB device of supporting two or more USB interfaces.
It is to belong to the Windows operating system nucleus to drive that said USB interface drives; Generally form by INF file and drive source file (.sys file); The USB interface that is provided with USB device is to concern one to one, be responsible for USB interface virtual be serial ports/MODEM, when USB device connects; Drive for each USB interface loads corresponding USB interface, just can with each USB interface virtual be that serial ports/MODEM is as shown in Figure 4.
Described INF file is the ingredient that USB interface drives, essential record the hardware information of USB interface (for example trading company of factory, device number and interface index number etc.) and USB interface drive relevant information (interface that for example need load drives filename, interface drives display name etc.).Wherein the AddService key word in the INF file is the service registry item that this interface drives; After loading the USB interface driving; Operating system will generate this registrations in registration table, this registrations destination path is exactly that described USB interface drives the service load path.
Describedly send the Message Processing thread to be meant to be used to handle thread from the control class request of operating system.
Described registration table is meant the registration table of operating system; Described facility registration information is that USB interface drives the self-defined information of under the driving service registry path of correspondence, registering, for example device numbering and corresponding port number etc.
In order to make the object of the invention, technical scheme and advantage clearer; Below in conjunction with accompanying drawing and a specific embodiment,, as shown in Figure 5 to the detection method further explain of a kind of USB commentaries on classics of the present invention virtual serial port/MODEM; Present embodiment adopts two USB devices (to be expressed as USB device A and USB device B; Especially, can be two data cards supporting USB), each USB device is supported two USB interfaces (being expressed as usb 1 and USB interface 2); At first one of them USB device is connected to computing machine; Be the USB interface loading interface driving of this USB device, USB interface drives at USB interface and drives registration facility information under the service registry path, connects another USB device and is connected to computing machine; Be the USB interface loading interface driving of this USB device, USB interface drives at USB interface and drives registration facility information under the service registry path; Start window application, window application access means information; Transfer to a USB device, window application is access means information once more; Present embodiment adopts above operation, makes window application can only pay close attention to the facility information of registration, can confirm accurately that promptly each USB changes the corresponding relation of virtual serial port/MODEM and USB device;
The present embodiment performing step is:
Step 1: USB device is connected to computing machine; USB device drives does not have Equipment Serial Number descriptor (serial number descriptor) at this USB device of device enumeration interim report, and this USB device of information notice computing machine such as reporting equipment descriptor is supported two USB interfaces; Computing machine enumerates two USB interfaces after obtaining descriptor;
It is the embedded driving that is positioned at USB device that said USB device drives, functions such as responsible USB device is enumerated, communication.
Said Equipment Serial Number descriptor is to be contained in the USB descriptor, and according to usb protocol, the USB descriptor is responsible for describing the USB device ability, need in the USB enumeration process, report computing machine, and computing machine will be the USB Resources allocation in view of the above.If in enumeration process; USB device has reported the sequence number descriptor; Computing machine can't support a plurality of identical USB devices to move simultaneously so, therefore in order to realize that a plurality of USB devices move simultaneously, should in device descriptor, set this USB device and not possess the sequence number descriptor.
Step 2: drive for each USB interface loads USB interface; Operating system drives the service registry path for it generates USB interface in registration table; And call USB interface and drive entrance function DriverEntry; And to this function passes RegistryPath parameter, the content of this parameter is the service registry path that this USB interface drives; USB interface drives and is this USB device set device numbering, and creates virtual serial port/MODEM for this USB interface, generates port numbers;
In the present embodiment; Operating system is further called the AddDevice routine that USB interface drives; It is this USB device set device numbering in this routine that USB interface drives, and sends the Message Processing thread for this numbering equipment establishment, is that this USB interface is created virtual serial port/MODEM simultaneously; After creating successfully, operating system generates port numbers for it;
Said device numbering has uniqueness corresponding to a USB device that is moving;
Said DriverEntry is the entrance function that USB interface drives; When computing machine loads this interface driving first; Operating system will at first be called this entrance function; And transmit parameters R egistryPath simultaneously to this function, the content of RegisterPath is the service registry path that this interface drives;
Said AddDevice is the routine that USB interface drives, and when load driver, operating system can initiatively be called this routine, and the AddDevice routine is responsible for this USB interface and creates virtual serial port/MODEM device object.
Step 3: operating system drives transmission USB to USB interface and enumerates the relevant message of sending; USB interface drive in sending the Message Processing thread correct handling intact enumerating relevant send message after, under driving interface service registry path, register device numbering and corresponding port number;
Said enumerating relevant sends message to be meant at USB interface to drive a series of control request of being initiated by operating system nucleus parts " PNP (Plug and Plag) manager " when loading.
Step 4: judge whether all USB device interface drive installations completion? Be then to wait for application call, otherwise return step 1;
In the present embodiment; After two USB devices are connected to computing machine; Be its two USB interface installing drive; Under the service registry path that each USB interface drives in the registration table, USB interface drives the device numbering of setting USB device and is respectively " 0 " and " 1 ", and each device numbering has corresponding port number respectively;
Through above step; After installing two USB devices; The corresponding relation in each interface of USB device, USB device, each USB interface driving, USB device numbering, interface corresponding virtual serial ports/MODEM port numbers and USB interface driving service registry path is as shown in Figure 6: two USB devices (USB device A and USB device B) comprise two USB interfaces (usb 1 and USB interface 2) respectively; The usb 1 of each USB device has all loaded a USB interface and has driven 1; The USB interface 2 of each USB device has all loaded a USB interface and has driven 2; USB interface drives the 1 corresponding service registry path of a usb 1; USB interface drives the 2 corresponding service registry paths of a USB interface 2; USB interface drives the port numbers of the usb 1 of having registered " 0 " number equipment and correspondence under the 1 service registry path respectively and the port numbers of " 1 " number equipment and the usb 1 of correspondence; Same USB interface drives the port numbers of the USB interface 2 of having registered " 0 " number equipment and correspondence under the 2 service registry paths respectively and port numbers and other facility informations of " 1 " number equipment and the USB interface 2 of correspondence, makes application program can directly visit USB interface and drives 1 and 2 service registry path and be registered in the facility information under this path, thereby locate the relation of each virtual serial port/MODEM and USB device.
In use; Application program is obtained each USB interface and is driven device numbering and corresponding port number under registered paths; Confirm current USB device quantity and device numbering; And confirm the USB interface quantity (corresponding respectively to different USB interface service registry paths) of each equipment and each USB interface corresponding port of each equipment number (present embodiment is two USB devices, and device numbering is respectively: " 0 " and " 1 ") simultaneously;
Step 5: extract USB device; Operating system drives transmitting apparatus to each USB interface and extracts the relevant message of sending; Each USB interface drive finish this USB device send the Message Processing thread; USB interface drives the releasing arrangement numbering, deletes each USB interface simultaneously and drives device numbering and corresponding port information under the service registry path;
In use; Window application is confirmed current USB device quantity and device numbering; And confirm the USB interface quantity (corresponding respectively to different USB interface service registry paths) of each equipment simultaneously, and each USB interface corresponding port of each equipment number.
The present invention for window application before the USB device log-on message changes, afterwards or start in the process and all be suitable for.Window application before the USB device log-on message changes, afterwards or start in the process and should be included within protection scope of the present invention;
The present invention above the embodiment of lifting or embodiment be merely preferred implementation of the present invention; Not in order to restriction the present invention; All within spirit of the present invention and principle to any modification that the present invention did, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. a USB changes the detection method of virtual serial port/MODEM, it is characterized in that:
Window application detects the corresponding USB interface of each USB interface that whether has USB device in the registration table and drives the service registry path, if exist, reads each USB interface and drives the facility registration information under the service registry path;
Said USB interface drives service registry path generating mode: each USB interface that is USB device when USB device is connected to computing machine loads the USB interface driving, and operating system generates USB interface to the USB interface that has nothing in common with each other and drives the service registry path in registration table;
The generating mode of said facility registration information is: USB interface drives registration corresponding equipment information under said USB interface driving service registry path separately.
2. the USB detection method of changeing virtual serial port/MODEM according to claim 1; It is characterized in that; If window application has the function of surveying USB plug broadcast, when USB device was connected to computing machine, operating system was sent USB to window application and is inserted broadcast.
3. the USB detection method of changeing virtual serial port/MODEM according to claim 1; It is characterized in that; If window application does not have the function of surveying USB plug broadcast; After each USB interface drives the loading completion, manually boot window application, application program reads each USB interface and drives the facility registration information under registered paths.
4. the detection method of changeing virtual serial port/MODEM like the said USB of claim 2 is characterized in that, application program reads each USB interface and drives the facility registration information under the registered paths after receiving the broadcast that USB extracts.
5. the USB detection method of changeing virtual serial port/MODEM according to claim 1 is characterized in that, also comprises said facility registration information when extract USB device, is deleted by each USB interface driving corresponding to this USB device.
6. the detection method of changeing virtual serial port/MODEM like the arbitrary said USB of claim 1-5 is characterized in that described USB device is single USB device or a plurality of single USB devices;
Said single USB device is the USB device of supporting the USB device of single USB interface or supporting a plurality of USB interfaces.
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| CN2010106215916A CN102567268A (en) | 2010-12-31 | 2010-12-31 | Detection method for USB to virtual serial port/MODEM |
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| CN102904785A (en) * | 2012-10-17 | 2013-01-30 | 深圳市吉祥腾达科技有限公司 | Wireless network card compatibility implementing method |
| CN103440214A (en) * | 2013-09-03 | 2013-12-11 | 深圳雷柏科技股份有限公司 | Method and device for rapidly identifying plugged USB (Universal Serial Bus) equipment |
| CN105791732A (en) * | 2014-12-23 | 2016-07-20 | 乐视移动智能信息技术（北京）有限公司 | Processing method and apparatus for MHL (Mobile High-Definition Link) driver |
| CN106445847A (en) * | 2016-09-12 | 2017-02-22 | 天脉聚源(北京)传媒科技有限公司 | U disk SN code obtaining method and device |
| CN110244983A (en) * | 2019-05-30 | 2019-09-17 | 百富计算机技术（深圳）有限公司 | Method, terminal device and the storage medium of fixed serial port |
| CN111124726A (en) * | 2019-12-09 | 2020-05-08 | 上海移远通信技术股份有限公司 | Method and device for detecting abnormity of opened modem port |
| CN113360443A (en) * | 2021-05-31 | 2021-09-07 | 浪潮电子信息产业股份有限公司 | Serial port card communication implementation method, device, equipment and readable storage medium |
| CN113608790A (en) * | 2021-07-14 | 2021-11-05 | 深圳市科陆电子科技股份有限公司 | Linux system based self-adaptive management method and system for serial device and storage medium |
| CN113741983A (en) * | 2021-07-21 | 2021-12-03 | 深圳市智微智能科技股份有限公司 | USB device access method, system, terminal and storage medium in android system |
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| CN102904785A (en) * | 2012-10-17 | 2013-01-30 | 深圳市吉祥腾达科技有限公司 | Wireless network card compatibility implementing method |
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| CN111124726A (en) * | 2019-12-09 | 2020-05-08 | 上海移远通信技术股份有限公司 | Method and device for detecting abnormity of opened modem port |
| CN111124726B (en) * | 2019-12-09 | 2024-01-26 | 上海移远通信技术股份有限公司 | Method and device for detecting abnormality of open modem port |
| CN113360443A (en) * | 2021-05-31 | 2021-09-07 | 浪潮电子信息产业股份有限公司 | Serial port card communication implementation method, device, equipment and readable storage medium |
| CN113360443B (en) * | 2021-05-31 | 2022-07-08 | 浪潮电子信息产业股份有限公司 | Serial port card communication realization method, device, equipment and readable storage medium |
| CN113608790A (en) * | 2021-07-14 | 2021-11-05 | 深圳市科陆电子科技股份有限公司 | Linux system based self-adaptive management method and system for serial device and storage medium |
| CN113741983A (en) * | 2021-07-21 | 2021-12-03 | 深圳市智微智能科技股份有限公司 | USB device access method, system, terminal and storage medium in android system |
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